diff options
Diffstat (limited to 'arch/m68k/fpsp040/res_func.S')
| -rw-r--r-- | arch/m68k/fpsp040/res_func.S | 2039 |
1 files changed, 2039 insertions, 0 deletions
diff --git a/arch/m68k/fpsp040/res_func.S b/arch/m68k/fpsp040/res_func.S new file mode 100644 index 0000000000..d9cdf43835 --- /dev/null +++ b/arch/m68k/fpsp040/res_func.S @@ -0,0 +1,2039 @@ +| +| res_func.sa 3.9 7/29/91 +| +| Normalizes denormalized numbers if necessary and updates the +| stack frame. The function is then restored back into the +| machine and the 040 completes the operation. This routine +| is only used by the unsupported data type/format handler. +| (Exception vector 55). +| +| For packed move out (fmove.p fpm,<ea>) the operation is +| completed here; data is packed and moved to user memory. +| The stack is restored to the 040 only in the case of a +| reportable exception in the conversion. +| +| +| Copyright (C) Motorola, Inc. 1990 +| All Rights Reserved +| +| For details on the license for this file, please see the +| file, README, in this same directory. + +RES_FUNC: |idnt 2,1 | Motorola 040 Floating Point Software Package + + |section 8 + +#include "fpsp.h" + +sp_bnds: .short 0x3f81,0x407e + .short 0x3f6a,0x0000 +dp_bnds: .short 0x3c01,0x43fe + .short 0x3bcd,0x0000 + + |xref mem_write + |xref bindec + |xref get_fline + |xref round + |xref denorm + |xref dest_ext + |xref dest_dbl + |xref dest_sgl + |xref unf_sub + |xref nrm_set + |xref dnrm_lp + |xref ovf_res + |xref reg_dest + |xref t_ovfl + |xref t_unfl + + .global res_func + .global p_move + +res_func: + clrb DNRM_FLG(%a6) + clrb RES_FLG(%a6) + clrb CU_ONLY(%a6) + tstb DY_MO_FLG(%a6) + beqs monadic +dyadic: + btstb #7,DTAG(%a6) |if dop = norm=000, zero=001, +| ;inf=010 or nan=011 + beqs monadic |then branch +| ;else denorm +| HANDLE DESTINATION DENORM HERE +| ;set dtag to norm +| ;write the tag & fpte15 to the fstack + leal FPTEMP(%a6),%a0 + + bclrb #sign_bit,LOCAL_EX(%a0) + sne LOCAL_SGN(%a0) + + bsr nrm_set |normalize number (exp will go negative) + bclrb #sign_bit,LOCAL_EX(%a0) |get rid of false sign + bfclr LOCAL_SGN(%a0){#0:#8} |change back to IEEE ext format + beqs dpos + bsetb #sign_bit,LOCAL_EX(%a0) +dpos: + bfclr DTAG(%a6){#0:#4} |set tag to normalized, FPTE15 = 0 + bsetb #4,DTAG(%a6) |set FPTE15 + orb #0x0f,DNRM_FLG(%a6) +monadic: + leal ETEMP(%a6),%a0 + btstb #direction_bit,CMDREG1B(%a6) |check direction + bne opclass3 |it is a mv out +| +| At this point, only opclass 0 and 2 possible +| + btstb #7,STAG(%a6) |if sop = norm=000, zero=001, +| ;inf=010 or nan=011 + bne mon_dnrm |else denorm + tstb DY_MO_FLG(%a6) |all cases of dyadic instructions would + bne normal |require normalization of denorm + +| At this point: +| monadic instructions: fabs = $18 fneg = $1a ftst = $3a +| fmove = $00 fsmove = $40 fdmove = $44 +| fsqrt = $05* fssqrt = $41 fdsqrt = $45 +| (*fsqrt reencoded to $05) +| + movew CMDREG1B(%a6),%d0 |get command register + andil #0x7f,%d0 |strip to only command word +| +| At this point, fabs, fneg, fsmove, fdmove, ftst, fsqrt, fssqrt, and +| fdsqrt are possible. +| For cases fabs, fneg, fsmove, and fdmove goto spos (do not normalize) +| For cases fsqrt, fssqrt, and fdsqrt goto nrm_src (do normalize) +| + btstl #0,%d0 + bne normal |weed out fsqrt instructions +| +| cu_norm handles fmove in instructions with normalized inputs. +| The routine round is used to correctly round the input for the +| destination precision and mode. +| +cu_norm: + st CU_ONLY(%a6) |set cu-only inst flag + movew CMDREG1B(%a6),%d0 + andib #0x3b,%d0 |isolate bits to select inst + tstb %d0 + beql cu_nmove |if zero, it is an fmove + cmpib #0x18,%d0 + beql cu_nabs |if $18, it is fabs + cmpib #0x1a,%d0 + beql cu_nneg |if $1a, it is fneg +| +| Inst is ftst. Check the source operand and set the cc's accordingly. +| No write is done, so simply rts. +| +cu_ntst: + movew LOCAL_EX(%a0),%d0 + bclrl #15,%d0 + sne LOCAL_SGN(%a0) + beqs cu_ntpo + orl #neg_mask,USER_FPSR(%a6) |set N +cu_ntpo: + cmpiw #0x7fff,%d0 |test for inf/nan + bnes cu_ntcz + tstl LOCAL_HI(%a0) + bnes cu_ntn + tstl LOCAL_LO(%a0) + bnes cu_ntn + orl #inf_mask,USER_FPSR(%a6) + rts +cu_ntn: + orl #nan_mask,USER_FPSR(%a6) + movel ETEMP_EX(%a6),FPTEMP_EX(%a6) |set up fptemp sign for +| ;snan handler + + rts +cu_ntcz: + tstl LOCAL_HI(%a0) + bnel cu_ntsx + tstl LOCAL_LO(%a0) + bnel cu_ntsx + orl #z_mask,USER_FPSR(%a6) +cu_ntsx: + rts +| +| Inst is fabs. Execute the absolute value function on the input. +| Branch to the fmove code. If the operand is NaN, do nothing. +| +cu_nabs: + moveb STAG(%a6),%d0 + btstl #5,%d0 |test for NaN or zero + bne wr_etemp |if either, simply write it + bclrb #7,LOCAL_EX(%a0) |do abs + bras cu_nmove |fmove code will finish +| +| Inst is fneg. Execute the negate value function on the input. +| Fall though to the fmove code. If the operand is NaN, do nothing. +| +cu_nneg: + moveb STAG(%a6),%d0 + btstl #5,%d0 |test for NaN or zero + bne wr_etemp |if either, simply write it + bchgb #7,LOCAL_EX(%a0) |do neg +| +| Inst is fmove. This code also handles all result writes. +| If bit 2 is set, round is forced to double. If it is clear, +| and bit 6 is set, round is forced to single. If both are clear, +| the round precision is found in the fpcr. If the rounding precision +| is double or single, round the result before the write. +| +cu_nmove: + moveb STAG(%a6),%d0 + andib #0xe0,%d0 |isolate stag bits + bne wr_etemp |if not norm, simply write it + btstb #2,CMDREG1B+1(%a6) |check for rd + bne cu_nmrd + btstb #6,CMDREG1B+1(%a6) |check for rs + bne cu_nmrs +| +| The move or operation is not with forced precision. Test for +| nan or inf as the input; if so, simply write it to FPn. Use the +| FPCR_MODE byte to get rounding on norms and zeros. +| +cu_nmnr: + bfextu FPCR_MODE(%a6){#0:#2},%d0 + tstb %d0 |check for extended + beq cu_wrexn |if so, just write result + cmpib #1,%d0 |check for single + beq cu_nmrs |fall through to double +| +| The move is fdmove or round precision is double. +| +cu_nmrd: + movel #2,%d0 |set up the size for denorm + movew LOCAL_EX(%a0),%d1 |compare exponent to double threshold + andw #0x7fff,%d1 + cmpw #0x3c01,%d1 + bls cu_nunfl + bfextu FPCR_MODE(%a6){#2:#2},%d1 |get rmode + orl #0x00020000,%d1 |or in rprec (double) + clrl %d0 |clear g,r,s for round + bclrb #sign_bit,LOCAL_EX(%a0) |convert to internal format + sne LOCAL_SGN(%a0) + bsrl round + bfclr LOCAL_SGN(%a0){#0:#8} + beqs cu_nmrdc + bsetb #sign_bit,LOCAL_EX(%a0) +cu_nmrdc: + movew LOCAL_EX(%a0),%d1 |check for overflow + andw #0x7fff,%d1 + cmpw #0x43ff,%d1 + bge cu_novfl |take care of overflow case + bra cu_wrexn +| +| The move is fsmove or round precision is single. +| +cu_nmrs: + movel #1,%d0 + movew LOCAL_EX(%a0),%d1 + andw #0x7fff,%d1 + cmpw #0x3f81,%d1 + bls cu_nunfl + bfextu FPCR_MODE(%a6){#2:#2},%d1 + orl #0x00010000,%d1 + clrl %d0 + bclrb #sign_bit,LOCAL_EX(%a0) + sne LOCAL_SGN(%a0) + bsrl round + bfclr LOCAL_SGN(%a0){#0:#8} + beqs cu_nmrsc + bsetb #sign_bit,LOCAL_EX(%a0) +cu_nmrsc: + movew LOCAL_EX(%a0),%d1 + andw #0x7FFF,%d1 + cmpw #0x407f,%d1 + blt cu_wrexn +| +| The operand is above precision boundaries. Use t_ovfl to +| generate the correct value. +| +cu_novfl: + bsr t_ovfl + bra cu_wrexn +| +| The operand is below precision boundaries. Use denorm to +| generate the correct value. +| +cu_nunfl: + bclrb #sign_bit,LOCAL_EX(%a0) + sne LOCAL_SGN(%a0) + bsr denorm + bfclr LOCAL_SGN(%a0){#0:#8} |change back to IEEE ext format + beqs cu_nucont + bsetb #sign_bit,LOCAL_EX(%a0) +cu_nucont: + bfextu FPCR_MODE(%a6){#2:#2},%d1 + btstb #2,CMDREG1B+1(%a6) |check for rd + bne inst_d + btstb #6,CMDREG1B+1(%a6) |check for rs + bne inst_s + swap %d1 + moveb FPCR_MODE(%a6),%d1 + lsrb #6,%d1 + swap %d1 + bra inst_sd +inst_d: + orl #0x00020000,%d1 + bra inst_sd +inst_s: + orl #0x00010000,%d1 +inst_sd: + bclrb #sign_bit,LOCAL_EX(%a0) + sne LOCAL_SGN(%a0) + bsrl round + bfclr LOCAL_SGN(%a0){#0:#8} + beqs cu_nuflp + bsetb #sign_bit,LOCAL_EX(%a0) +cu_nuflp: + btstb #inex2_bit,FPSR_EXCEPT(%a6) + beqs cu_nuninx + orl #aunfl_mask,USER_FPSR(%a6) |if the round was inex, set AUNFL +cu_nuninx: + tstl LOCAL_HI(%a0) |test for zero + bnes cu_nunzro + tstl LOCAL_LO(%a0) + bnes cu_nunzro +| +| The mantissa is zero from the denorm loop. Check sign and rmode +| to see if rounding should have occurred which would leave the lsb. +| + movel USER_FPCR(%a6),%d0 + andil #0x30,%d0 |isolate rmode + cmpil #0x20,%d0 + blts cu_nzro + bnes cu_nrp +cu_nrm: + tstw LOCAL_EX(%a0) |if positive, set lsb + bges cu_nzro + btstb #7,FPCR_MODE(%a6) |check for double + beqs cu_nincs + bras cu_nincd +cu_nrp: + tstw LOCAL_EX(%a0) |if positive, set lsb + blts cu_nzro + btstb #7,FPCR_MODE(%a6) |check for double + beqs cu_nincs +cu_nincd: + orl #0x800,LOCAL_LO(%a0) |inc for double + bra cu_nunzro +cu_nincs: + orl #0x100,LOCAL_HI(%a0) |inc for single + bra cu_nunzro +cu_nzro: + orl #z_mask,USER_FPSR(%a6) + moveb STAG(%a6),%d0 + andib #0xe0,%d0 + cmpib #0x40,%d0 |check if input was tagged zero + beqs cu_numv +cu_nunzro: + orl #unfl_mask,USER_FPSR(%a6) |set unfl +cu_numv: + movel (%a0),ETEMP(%a6) + movel 4(%a0),ETEMP_HI(%a6) + movel 8(%a0),ETEMP_LO(%a6) +| +| Write the result to memory, setting the fpsr cc bits. NaN and Inf +| bypass cu_wrexn. +| +cu_wrexn: + tstw LOCAL_EX(%a0) |test for zero + beqs cu_wrzero + cmpw #0x8000,LOCAL_EX(%a0) |test for zero + bnes cu_wreon +cu_wrzero: + orl #z_mask,USER_FPSR(%a6) |set Z bit +cu_wreon: + tstw LOCAL_EX(%a0) + bpl wr_etemp + orl #neg_mask,USER_FPSR(%a6) + bra wr_etemp + +| +| HANDLE SOURCE DENORM HERE +| +| ;clear denorm stag to norm +| ;write the new tag & ete15 to the fstack +mon_dnrm: +| +| At this point, check for the cases in which normalizing the +| denorm produces incorrect results. +| + tstb DY_MO_FLG(%a6) |all cases of dyadic instructions would + bnes nrm_src |require normalization of denorm + +| At this point: +| monadic instructions: fabs = $18 fneg = $1a ftst = $3a +| fmove = $00 fsmove = $40 fdmove = $44 +| fsqrt = $05* fssqrt = $41 fdsqrt = $45 +| (*fsqrt reencoded to $05) +| + movew CMDREG1B(%a6),%d0 |get command register + andil #0x7f,%d0 |strip to only command word +| +| At this point, fabs, fneg, fsmove, fdmove, ftst, fsqrt, fssqrt, and +| fdsqrt are possible. +| For cases fabs, fneg, fsmove, and fdmove goto spos (do not normalize) +| For cases fsqrt, fssqrt, and fdsqrt goto nrm_src (do normalize) +| + btstl #0,%d0 + bnes nrm_src |weed out fsqrt instructions + st CU_ONLY(%a6) |set cu-only inst flag + bra cu_dnrm |fmove, fabs, fneg, ftst +| ;cases go to cu_dnrm +nrm_src: + bclrb #sign_bit,LOCAL_EX(%a0) + sne LOCAL_SGN(%a0) + bsr nrm_set |normalize number (exponent will go +| ; negative) + bclrb #sign_bit,LOCAL_EX(%a0) |get rid of false sign + + bfclr LOCAL_SGN(%a0){#0:#8} |change back to IEEE ext format + beqs spos + bsetb #sign_bit,LOCAL_EX(%a0) +spos: + bfclr STAG(%a6){#0:#4} |set tag to normalized, FPTE15 = 0 + bsetb #4,STAG(%a6) |set ETE15 + orb #0xf0,DNRM_FLG(%a6) +normal: + tstb DNRM_FLG(%a6) |check if any of the ops were denorms + bne ck_wrap |if so, check if it is a potential +| ;wrap-around case +fix_stk: + moveb #0xfe,CU_SAVEPC(%a6) + bclrb #E1,E_BYTE(%a6) + + clrw NMNEXC(%a6) + + st RES_FLG(%a6) |indicate that a restore is needed + rts + +| +| cu_dnrm handles all cu-only instructions (fmove, fabs, fneg, and +| ftst) completely in software without an frestore to the 040. +| +cu_dnrm: + st CU_ONLY(%a6) + movew CMDREG1B(%a6),%d0 + andib #0x3b,%d0 |isolate bits to select inst + tstb %d0 + beql cu_dmove |if zero, it is an fmove + cmpib #0x18,%d0 + beql cu_dabs |if $18, it is fabs + cmpib #0x1a,%d0 + beql cu_dneg |if $1a, it is fneg +| +| Inst is ftst. Check the source operand and set the cc's accordingly. +| No write is done, so simply rts. +| +cu_dtst: + movew LOCAL_EX(%a0),%d0 + bclrl #15,%d0 + sne LOCAL_SGN(%a0) + beqs cu_dtpo + orl #neg_mask,USER_FPSR(%a6) |set N +cu_dtpo: + cmpiw #0x7fff,%d0 |test for inf/nan + bnes cu_dtcz + tstl LOCAL_HI(%a0) + bnes cu_dtn + tstl LOCAL_LO(%a0) + bnes cu_dtn + orl #inf_mask,USER_FPSR(%a6) + rts +cu_dtn: + orl #nan_mask,USER_FPSR(%a6) + movel ETEMP_EX(%a6),FPTEMP_EX(%a6) |set up fptemp sign for +| ;snan handler + rts +cu_dtcz: + tstl LOCAL_HI(%a0) + bnel cu_dtsx + tstl LOCAL_LO(%a0) + bnel cu_dtsx + orl #z_mask,USER_FPSR(%a6) +cu_dtsx: + rts +| +| Inst is fabs. Execute the absolute value function on the input. +| Branch to the fmove code. +| +cu_dabs: + bclrb #7,LOCAL_EX(%a0) |do abs + bras cu_dmove |fmove code will finish +| +| Inst is fneg. Execute the negate value function on the input. +| Fall though to the fmove code. +| +cu_dneg: + bchgb #7,LOCAL_EX(%a0) |do neg +| +| Inst is fmove. This code also handles all result writes. +| If bit 2 is set, round is forced to double. If it is clear, +| and bit 6 is set, round is forced to single. If both are clear, +| the round precision is found in the fpcr. If the rounding precision +| is double or single, the result is zero, and the mode is checked +| to determine if the lsb of the result should be set. +| +cu_dmove: + btstb #2,CMDREG1B+1(%a6) |check for rd + bne cu_dmrd + btstb #6,CMDREG1B+1(%a6) |check for rs + bne cu_dmrs +| +| The move or operation is not with forced precision. Use the +| FPCR_MODE byte to get rounding. +| +cu_dmnr: + bfextu FPCR_MODE(%a6){#0:#2},%d0 + tstb %d0 |check for extended + beq cu_wrexd |if so, just write result + cmpib #1,%d0 |check for single + beq cu_dmrs |fall through to double +| +| The move is fdmove or round precision is double. Result is zero. +| Check rmode for rp or rm and set lsb accordingly. +| +cu_dmrd: + bfextu FPCR_MODE(%a6){#2:#2},%d1 |get rmode + tstw LOCAL_EX(%a0) |check sign + blts cu_dmdn + cmpib #3,%d1 |check for rp + bne cu_dpd |load double pos zero + bra cu_dpdr |load double pos zero w/lsb +cu_dmdn: + cmpib #2,%d1 |check for rm + bne cu_dnd |load double neg zero + bra cu_dndr |load double neg zero w/lsb +| +| The move is fsmove or round precision is single. Result is zero. +| Check for rp or rm and set lsb accordingly. +| +cu_dmrs: + bfextu FPCR_MODE(%a6){#2:#2},%d1 |get rmode + tstw LOCAL_EX(%a0) |check sign + blts cu_dmsn + cmpib #3,%d1 |check for rp + bne cu_spd |load single pos zero + bra cu_spdr |load single pos zero w/lsb +cu_dmsn: + cmpib #2,%d1 |check for rm + bne cu_snd |load single neg zero + bra cu_sndr |load single neg zero w/lsb +| +| The precision is extended, so the result in etemp is correct. +| Simply set unfl (not inex2 or aunfl) and write the result to +| the correct fp register. +cu_wrexd: + orl #unfl_mask,USER_FPSR(%a6) + tstw LOCAL_EX(%a0) + beq wr_etemp + orl #neg_mask,USER_FPSR(%a6) + bra wr_etemp +| +| These routines write +/- zero in double format. The routines +| cu_dpdr and cu_dndr set the double lsb. +| +cu_dpd: + movel #0x3c010000,LOCAL_EX(%a0) |force pos double zero + clrl LOCAL_HI(%a0) + clrl LOCAL_LO(%a0) + orl #z_mask,USER_FPSR(%a6) + orl #unfinx_mask,USER_FPSR(%a6) + bra wr_etemp +cu_dpdr: + movel #0x3c010000,LOCAL_EX(%a0) |force pos double zero + clrl LOCAL_HI(%a0) + movel #0x800,LOCAL_LO(%a0) |with lsb set + orl #unfinx_mask,USER_FPSR(%a6) + bra wr_etemp +cu_dnd: + movel #0xbc010000,LOCAL_EX(%a0) |force pos double zero + clrl LOCAL_HI(%a0) + clrl LOCAL_LO(%a0) + orl #z_mask,USER_FPSR(%a6) + orl #neg_mask,USER_FPSR(%a6) + orl #unfinx_mask,USER_FPSR(%a6) + bra wr_etemp +cu_dndr: + movel #0xbc010000,LOCAL_EX(%a0) |force pos double zero + clrl LOCAL_HI(%a0) + movel #0x800,LOCAL_LO(%a0) |with lsb set + orl #neg_mask,USER_FPSR(%a6) + orl #unfinx_mask,USER_FPSR(%a6) + bra wr_etemp +| +| These routines write +/- zero in single format. The routines +| cu_dpdr and cu_dndr set the single lsb. +| +cu_spd: + movel #0x3f810000,LOCAL_EX(%a0) |force pos single zero + clrl LOCAL_HI(%a0) + clrl LOCAL_LO(%a0) + orl #z_mask,USER_FPSR(%a6) + orl #unfinx_mask,USER_FPSR(%a6) + bra wr_etemp +cu_spdr: + movel #0x3f810000,LOCAL_EX(%a0) |force pos single zero + movel #0x100,LOCAL_HI(%a0) |with lsb set + clrl LOCAL_LO(%a0) + orl #unfinx_mask,USER_FPSR(%a6) + bra wr_etemp +cu_snd: + movel #0xbf810000,LOCAL_EX(%a0) |force pos single zero + clrl LOCAL_HI(%a0) + clrl LOCAL_LO(%a0) + orl #z_mask,USER_FPSR(%a6) + orl #neg_mask,USER_FPSR(%a6) + orl #unfinx_mask,USER_FPSR(%a6) + bra wr_etemp +cu_sndr: + movel #0xbf810000,LOCAL_EX(%a0) |force pos single zero + movel #0x100,LOCAL_HI(%a0) |with lsb set + clrl LOCAL_LO(%a0) + orl #neg_mask,USER_FPSR(%a6) + orl #unfinx_mask,USER_FPSR(%a6) + bra wr_etemp + +| +| This code checks for 16-bit overflow conditions on dyadic +| operations which are not restorable into the floating-point +| unit and must be completed in software. Basically, this +| condition exists with a very large norm and a denorm. One +| of the operands must be denormalized to enter this code. +| +| Flags used: +| DY_MO_FLG contains 0 for monadic op, $ff for dyadic +| DNRM_FLG contains $00 for neither op denormalized +| $0f for the destination op denormalized +| $f0 for the source op denormalized +| $ff for both ops denormalized +| +| The wrap-around condition occurs for add, sub, div, and cmp +| when +| +| abs(dest_exp - src_exp) >= $8000 +| +| and for mul when +| +| (dest_exp + src_exp) < $0 +| +| we must process the operation here if this case is true. +| +| The rts following the frcfpn routine is the exit from res_func +| for this condition. The restore flag (RES_FLG) is left clear. +| No frestore is done unless an exception is to be reported. +| +| For fadd: +| if(sign_of(dest) != sign_of(src)) +| replace exponent of src with $3fff (keep sign) +| use fpu to perform dest+new_src (user's rmode and X) +| clr sticky +| else +| set sticky +| call round with user's precision and mode +| move result to fpn and wbtemp +| +| For fsub: +| if(sign_of(dest) == sign_of(src)) +| replace exponent of src with $3fff (keep sign) +| use fpu to perform dest+new_src (user's rmode and X) +| clr sticky +| else +| set sticky +| call round with user's precision and mode +| move result to fpn and wbtemp +| +| For fdiv/fsgldiv: +| if(both operands are denorm) +| restore_to_fpu; +| if(dest is norm) +| force_ovf; +| else(dest is denorm) +| force_unf: +| +| For fcmp: +| if(dest is norm) +| N = sign_of(dest); +| else(dest is denorm) +| N = sign_of(src); +| +| For fmul: +| if(both operands are denorm) +| force_unf; +| if((dest_exp + src_exp) < 0) +| force_unf: +| else +| restore_to_fpu; +| +| local equates: + .set addcode,0x22 + .set subcode,0x28 + .set mulcode,0x23 + .set divcode,0x20 + .set cmpcode,0x38 +ck_wrap: + | tstb DY_MO_FLG(%a6) ;check for fsqrt + beq fix_stk |if zero, it is fsqrt + movew CMDREG1B(%a6),%d0 + andiw #0x3b,%d0 |strip to command bits + cmpiw #addcode,%d0 + beq wrap_add + cmpiw #subcode,%d0 + beq wrap_sub + cmpiw #mulcode,%d0 + beq wrap_mul + cmpiw #cmpcode,%d0 + beq wrap_cmp +| +| Inst is fdiv. +| +wrap_div: + cmpb #0xff,DNRM_FLG(%a6) |if both ops denorm, + beq fix_stk |restore to fpu +| +| One of the ops is denormalized. Test for wrap condition +| and force the result. +| + cmpb #0x0f,DNRM_FLG(%a6) |check for dest denorm + bnes div_srcd +div_destd: + bsrl ckinf_ns + bne fix_stk + bfextu ETEMP_EX(%a6){#1:#15},%d0 |get src exp (always pos) + bfexts FPTEMP_EX(%a6){#1:#15},%d1 |get dest exp (always neg) + subl %d1,%d0 |subtract dest from src + cmpl #0x7fff,%d0 + blt fix_stk |if less, not wrap case + clrb WBTEMP_SGN(%a6) + movew ETEMP_EX(%a6),%d0 |find the sign of the result + movew FPTEMP_EX(%a6),%d1 + eorw %d1,%d0 + andiw #0x8000,%d0 + beq force_unf + st WBTEMP_SGN(%a6) + bra force_unf + +ckinf_ns: + moveb STAG(%a6),%d0 |check source tag for inf or nan + bra ck_in_com +ckinf_nd: + moveb DTAG(%a6),%d0 |check destination tag for inf or nan +ck_in_com: + andib #0x60,%d0 |isolate tag bits + cmpb #0x40,%d0 |is it inf? + beq nan_or_inf |not wrap case + cmpb #0x60,%d0 |is it nan? + beq nan_or_inf |yes, not wrap case? + cmpb #0x20,%d0 |is it a zero? + beq nan_or_inf |yes + clrl %d0 + rts |then ; it is either a zero of norm, +| ;check wrap case +nan_or_inf: + moveql #-1,%d0 + rts + + + +div_srcd: + bsrl ckinf_nd + bne fix_stk + bfextu FPTEMP_EX(%a6){#1:#15},%d0 |get dest exp (always pos) + bfexts ETEMP_EX(%a6){#1:#15},%d1 |get src exp (always neg) + subl %d1,%d0 |subtract src from dest + cmpl #0x8000,%d0 + blt fix_stk |if less, not wrap case + clrb WBTEMP_SGN(%a6) + movew ETEMP_EX(%a6),%d0 |find the sign of the result + movew FPTEMP_EX(%a6),%d1 + eorw %d1,%d0 + andiw #0x8000,%d0 + beqs force_ovf + st WBTEMP_SGN(%a6) +| +| This code handles the case of the instruction resulting in +| an overflow condition. +| +force_ovf: + bclrb #E1,E_BYTE(%a6) + orl #ovfl_inx_mask,USER_FPSR(%a6) + clrw NMNEXC(%a6) + leal WBTEMP(%a6),%a0 |point a0 to memory location + movew CMDREG1B(%a6),%d0 + btstl #6,%d0 |test for forced precision + beqs frcovf_fpcr + btstl #2,%d0 |check for double + bnes frcovf_dbl + movel #0x1,%d0 |inst is forced single + bras frcovf_rnd +frcovf_dbl: + movel #0x2,%d0 |inst is forced double + bras frcovf_rnd +frcovf_fpcr: + bfextu FPCR_MODE(%a6){#0:#2},%d0 |inst not forced - use fpcr prec +frcovf_rnd: + +| The 881/882 does not set inex2 for the following case, so the +| line is commented out to be compatible with 881/882 +| tst.b %d0 +| beq.b frcovf_x +| or.l #inex2_mask,USER_FPSR(%a6) ;if prec is s or d, set inex2 + +|frcovf_x: + bsrl ovf_res |get correct result based on +| ;round precision/mode. This +| ;sets FPSR_CC correctly +| ;returns in external format + bfclr WBTEMP_SGN(%a6){#0:#8} + beq frcfpn + bsetb #sign_bit,WBTEMP_EX(%a6) + bra frcfpn +| +| Inst is fadd. +| +wrap_add: + cmpb #0xff,DNRM_FLG(%a6) |if both ops denorm, + beq fix_stk |restore to fpu +| +| One of the ops is denormalized. Test for wrap condition +| and complete the instruction. +| + cmpb #0x0f,DNRM_FLG(%a6) |check for dest denorm + bnes add_srcd +add_destd: + bsrl ckinf_ns + bne fix_stk + bfextu ETEMP_EX(%a6){#1:#15},%d0 |get src exp (always pos) + bfexts FPTEMP_EX(%a6){#1:#15},%d1 |get dest exp (always neg) + subl %d1,%d0 |subtract dest from src + cmpl #0x8000,%d0 + blt fix_stk |if less, not wrap case + bra add_wrap +add_srcd: + bsrl ckinf_nd + bne fix_stk + bfextu FPTEMP_EX(%a6){#1:#15},%d0 |get dest exp (always pos) + bfexts ETEMP_EX(%a6){#1:#15},%d1 |get src exp (always neg) + subl %d1,%d0 |subtract src from dest + cmpl #0x8000,%d0 + blt fix_stk |if less, not wrap case +| +| Check the signs of the operands. If they are unlike, the fpu +| can be used to add the norm and 1.0 with the sign of the +| denorm and it will correctly generate the result in extended +| precision. We can then call round with no sticky and the result +| will be correct for the user's rounding mode and precision. If +| the signs are the same, we call round with the sticky bit set +| and the result will be correct for the user's rounding mode and +| precision. +| +add_wrap: + movew ETEMP_EX(%a6),%d0 + movew FPTEMP_EX(%a6),%d1 + eorw %d1,%d0 + andiw #0x8000,%d0 + beq add_same +| +| The signs are unlike. +| + cmpb #0x0f,DNRM_FLG(%a6) |is dest the denorm? + bnes add_u_srcd + movew FPTEMP_EX(%a6),%d0 + andiw #0x8000,%d0 + orw #0x3fff,%d0 |force the exponent to +/- 1 + movew %d0,FPTEMP_EX(%a6) |in the denorm + movel USER_FPCR(%a6),%d0 + andil #0x30,%d0 + fmovel %d0,%fpcr |set up users rmode and X + fmovex ETEMP(%a6),%fp0 + faddx FPTEMP(%a6),%fp0 + leal WBTEMP(%a6),%a0 |point a0 to wbtemp in frame + fmovel %fpsr,%d1 + orl %d1,USER_FPSR(%a6) |capture cc's and inex from fadd + fmovex %fp0,WBTEMP(%a6) |write result to memory + lsrl #4,%d0 |put rmode in lower 2 bits + movel USER_FPCR(%a6),%d1 + andil #0xc0,%d1 + lsrl #6,%d1 |put precision in upper word + swap %d1 + orl %d0,%d1 |set up for round call + clrl %d0 |force sticky to zero + bclrb #sign_bit,WBTEMP_EX(%a6) + sne WBTEMP_SGN(%a6) + bsrl round |round result to users rmode & prec + bfclr WBTEMP_SGN(%a6){#0:#8} |convert back to IEEE ext format + beq frcfpnr + bsetb #sign_bit,WBTEMP_EX(%a6) + bra frcfpnr +add_u_srcd: + movew ETEMP_EX(%a6),%d0 + andiw #0x8000,%d0 + orw #0x3fff,%d0 |force the exponent to +/- 1 + movew %d0,ETEMP_EX(%a6) |in the denorm + movel USER_FPCR(%a6),%d0 + andil #0x30,%d0 + fmovel %d0,%fpcr |set up users rmode and X + fmovex ETEMP(%a6),%fp0 + faddx FPTEMP(%a6),%fp0 + fmovel %fpsr,%d1 + orl %d1,USER_FPSR(%a6) |capture cc's and inex from fadd + leal WBTEMP(%a6),%a0 |point a0 to wbtemp in frame + fmovex %fp0,WBTEMP(%a6) |write result to memory + lsrl #4,%d0 |put rmode in lower 2 bits + movel USER_FPCR(%a6),%d1 + andil #0xc0,%d1 + lsrl #6,%d1 |put precision in upper word + swap %d1 + orl %d0,%d1 |set up for round call + clrl %d0 |force sticky to zero + bclrb #sign_bit,WBTEMP_EX(%a6) + sne WBTEMP_SGN(%a6) |use internal format for round + bsrl round |round result to users rmode & prec + bfclr WBTEMP_SGN(%a6){#0:#8} |convert back to IEEE ext format + beq frcfpnr + bsetb #sign_bit,WBTEMP_EX(%a6) + bra frcfpnr +| +| Signs are alike: +| +add_same: + cmpb #0x0f,DNRM_FLG(%a6) |is dest the denorm? + bnes add_s_srcd +add_s_destd: + leal ETEMP(%a6),%a0 + movel USER_FPCR(%a6),%d0 + andil #0x30,%d0 + lsrl #4,%d0 |put rmode in lower 2 bits + movel USER_FPCR(%a6),%d1 + andil #0xc0,%d1 + lsrl #6,%d1 |put precision in upper word + swap %d1 + orl %d0,%d1 |set up for round call + movel #0x20000000,%d0 |set sticky for round + bclrb #sign_bit,ETEMP_EX(%a6) + sne ETEMP_SGN(%a6) + bsrl round |round result to users rmode & prec + bfclr ETEMP_SGN(%a6){#0:#8} |convert back to IEEE ext format + beqs add_s_dclr + bsetb #sign_bit,ETEMP_EX(%a6) +add_s_dclr: + leal WBTEMP(%a6),%a0 + movel ETEMP(%a6),(%a0) |write result to wbtemp + movel ETEMP_HI(%a6),4(%a0) + movel ETEMP_LO(%a6),8(%a0) + tstw ETEMP_EX(%a6) + bgt add_ckovf + orl #neg_mask,USER_FPSR(%a6) + bra add_ckovf +add_s_srcd: + leal FPTEMP(%a6),%a0 + movel USER_FPCR(%a6),%d0 + andil #0x30,%d0 + lsrl #4,%d0 |put rmode in lower 2 bits + movel USER_FPCR(%a6),%d1 + andil #0xc0,%d1 + lsrl #6,%d1 |put precision in upper word + swap %d1 + orl %d0,%d1 |set up for round call + movel #0x20000000,%d0 |set sticky for round + bclrb #sign_bit,FPTEMP_EX(%a6) + sne FPTEMP_SGN(%a6) + bsrl round |round result to users rmode & prec + bfclr FPTEMP_SGN(%a6){#0:#8} |convert back to IEEE ext format + beqs add_s_sclr + bsetb #sign_bit,FPTEMP_EX(%a6) +add_s_sclr: + leal WBTEMP(%a6),%a0 + movel FPTEMP(%a6),(%a0) |write result to wbtemp + movel FPTEMP_HI(%a6),4(%a0) + movel FPTEMP_LO(%a6),8(%a0) + tstw FPTEMP_EX(%a6) + bgt add_ckovf + orl #neg_mask,USER_FPSR(%a6) +add_ckovf: + movew WBTEMP_EX(%a6),%d0 + andiw #0x7fff,%d0 + cmpiw #0x7fff,%d0 + bne frcfpnr +| +| The result has overflowed to $7fff exponent. Set I, ovfl, +| and aovfl, and clr the mantissa (incorrectly set by the +| round routine.) +| + orl #inf_mask+ovfl_inx_mask,USER_FPSR(%a6) + clrl 4(%a0) + bra frcfpnr +| +| Inst is fsub. +| +wrap_sub: + cmpb #0xff,DNRM_FLG(%a6) |if both ops denorm, + beq fix_stk |restore to fpu +| +| One of the ops is denormalized. Test for wrap condition +| and complete the instruction. +| + cmpb #0x0f,DNRM_FLG(%a6) |check for dest denorm + bnes sub_srcd +sub_destd: + bsrl ckinf_ns + bne fix_stk + bfextu ETEMP_EX(%a6){#1:#15},%d0 |get src exp (always pos) + bfexts FPTEMP_EX(%a6){#1:#15},%d1 |get dest exp (always neg) + subl %d1,%d0 |subtract src from dest + cmpl #0x8000,%d0 + blt fix_stk |if less, not wrap case + bra sub_wrap +sub_srcd: + bsrl ckinf_nd + bne fix_stk + bfextu FPTEMP_EX(%a6){#1:#15},%d0 |get dest exp (always pos) + bfexts ETEMP_EX(%a6){#1:#15},%d1 |get src exp (always neg) + subl %d1,%d0 |subtract dest from src + cmpl #0x8000,%d0 + blt fix_stk |if less, not wrap case +| +| Check the signs of the operands. If they are alike, the fpu +| can be used to subtract from the norm 1.0 with the sign of the +| denorm and it will correctly generate the result in extended +| precision. We can then call round with no sticky and the result +| will be correct for the user's rounding mode and precision. If +| the signs are unlike, we call round with the sticky bit set +| and the result will be correct for the user's rounding mode and +| precision. +| +sub_wrap: + movew ETEMP_EX(%a6),%d0 + movew FPTEMP_EX(%a6),%d1 + eorw %d1,%d0 + andiw #0x8000,%d0 + bne sub_diff +| +| The signs are alike. +| + cmpb #0x0f,DNRM_FLG(%a6) |is dest the denorm? + bnes sub_u_srcd + movew FPTEMP_EX(%a6),%d0 + andiw #0x8000,%d0 + orw #0x3fff,%d0 |force the exponent to +/- 1 + movew %d0,FPTEMP_EX(%a6) |in the denorm + movel USER_FPCR(%a6),%d0 + andil #0x30,%d0 + fmovel %d0,%fpcr |set up users rmode and X + fmovex FPTEMP(%a6),%fp0 + fsubx ETEMP(%a6),%fp0 + fmovel %fpsr,%d1 + orl %d1,USER_FPSR(%a6) |capture cc's and inex from fadd + leal WBTEMP(%a6),%a0 |point a0 to wbtemp in frame + fmovex %fp0,WBTEMP(%a6) |write result to memory + lsrl #4,%d0 |put rmode in lower 2 bits + movel USER_FPCR(%a6),%d1 + andil #0xc0,%d1 + lsrl #6,%d1 |put precision in upper word + swap %d1 + orl %d0,%d1 |set up for round call + clrl %d0 |force sticky to zero + bclrb #sign_bit,WBTEMP_EX(%a6) + sne WBTEMP_SGN(%a6) + bsrl round |round result to users rmode & prec + bfclr WBTEMP_SGN(%a6){#0:#8} |convert back to IEEE ext format + beq frcfpnr + bsetb #sign_bit,WBTEMP_EX(%a6) + bra frcfpnr +sub_u_srcd: + movew ETEMP_EX(%a6),%d0 + andiw #0x8000,%d0 + orw #0x3fff,%d0 |force the exponent to +/- 1 + movew %d0,ETEMP_EX(%a6) |in the denorm + movel USER_FPCR(%a6),%d0 + andil #0x30,%d0 + fmovel %d0,%fpcr |set up users rmode and X + fmovex FPTEMP(%a6),%fp0 + fsubx ETEMP(%a6),%fp0 + fmovel %fpsr,%d1 + orl %d1,USER_FPSR(%a6) |capture cc's and inex from fadd + leal WBTEMP(%a6),%a0 |point a0 to wbtemp in frame + fmovex %fp0,WBTEMP(%a6) |write result to memory + lsrl #4,%d0 |put rmode in lower 2 bits + movel USER_FPCR(%a6),%d1 + andil #0xc0,%d1 + lsrl #6,%d1 |put precision in upper word + swap %d1 + orl %d0,%d1 |set up for round call + clrl %d0 |force sticky to zero + bclrb #sign_bit,WBTEMP_EX(%a6) + sne WBTEMP_SGN(%a6) + bsrl round |round result to users rmode & prec + bfclr WBTEMP_SGN(%a6){#0:#8} |convert back to IEEE ext format + beq frcfpnr + bsetb #sign_bit,WBTEMP_EX(%a6) + bra frcfpnr +| +| Signs are unlike: +| +sub_diff: + cmpb #0x0f,DNRM_FLG(%a6) |is dest the denorm? + bnes sub_s_srcd +sub_s_destd: + leal ETEMP(%a6),%a0 + movel USER_FPCR(%a6),%d0 + andil #0x30,%d0 + lsrl #4,%d0 |put rmode in lower 2 bits + movel USER_FPCR(%a6),%d1 + andil #0xc0,%d1 + lsrl #6,%d1 |put precision in upper word + swap %d1 + orl %d0,%d1 |set up for round call + movel #0x20000000,%d0 |set sticky for round +| +| Since the dest is the denorm, the sign is the opposite of the +| norm sign. +| + eoriw #0x8000,ETEMP_EX(%a6) |flip sign on result + tstw ETEMP_EX(%a6) + bgts sub_s_dwr + orl #neg_mask,USER_FPSR(%a6) +sub_s_dwr: + bclrb #sign_bit,ETEMP_EX(%a6) + sne ETEMP_SGN(%a6) + bsrl round |round result to users rmode & prec + bfclr ETEMP_SGN(%a6){#0:#8} |convert back to IEEE ext format + beqs sub_s_dclr + bsetb #sign_bit,ETEMP_EX(%a6) +sub_s_dclr: + leal WBTEMP(%a6),%a0 + movel ETEMP(%a6),(%a0) |write result to wbtemp + movel ETEMP_HI(%a6),4(%a0) + movel ETEMP_LO(%a6),8(%a0) + bra sub_ckovf +sub_s_srcd: + leal FPTEMP(%a6),%a0 + movel USER_FPCR(%a6),%d0 + andil #0x30,%d0 + lsrl #4,%d0 |put rmode in lower 2 bits + movel USER_FPCR(%a6),%d1 + andil #0xc0,%d1 + lsrl #6,%d1 |put precision in upper word + swap %d1 + orl %d0,%d1 |set up for round call + movel #0x20000000,%d0 |set sticky for round + bclrb #sign_bit,FPTEMP_EX(%a6) + sne FPTEMP_SGN(%a6) + bsrl round |round result to users rmode & prec + bfclr FPTEMP_SGN(%a6){#0:#8} |convert back to IEEE ext format + beqs sub_s_sclr + bsetb #sign_bit,FPTEMP_EX(%a6) +sub_s_sclr: + leal WBTEMP(%a6),%a0 + movel FPTEMP(%a6),(%a0) |write result to wbtemp + movel FPTEMP_HI(%a6),4(%a0) + movel FPTEMP_LO(%a6),8(%a0) + tstw FPTEMP_EX(%a6) + bgt sub_ckovf + orl #neg_mask,USER_FPSR(%a6) +sub_ckovf: + movew WBTEMP_EX(%a6),%d0 + andiw #0x7fff,%d0 + cmpiw #0x7fff,%d0 + bne frcfpnr +| +| The result has overflowed to $7fff exponent. Set I, ovfl, +| and aovfl, and clr the mantissa (incorrectly set by the +| round routine.) +| + orl #inf_mask+ovfl_inx_mask,USER_FPSR(%a6) + clrl 4(%a0) + bra frcfpnr +| +| Inst is fcmp. +| +wrap_cmp: + cmpb #0xff,DNRM_FLG(%a6) |if both ops denorm, + beq fix_stk |restore to fpu +| +| One of the ops is denormalized. Test for wrap condition +| and complete the instruction. +| + cmpb #0x0f,DNRM_FLG(%a6) |check for dest denorm + bnes cmp_srcd +cmp_destd: + bsrl ckinf_ns + bne fix_stk + bfextu ETEMP_EX(%a6){#1:#15},%d0 |get src exp (always pos) + bfexts FPTEMP_EX(%a6){#1:#15},%d1 |get dest exp (always neg) + subl %d1,%d0 |subtract dest from src + cmpl #0x8000,%d0 + blt fix_stk |if less, not wrap case + tstw ETEMP_EX(%a6) |set N to ~sign_of(src) + bge cmp_setn + rts +cmp_srcd: + bsrl ckinf_nd + bne fix_stk + bfextu FPTEMP_EX(%a6){#1:#15},%d0 |get dest exp (always pos) + bfexts ETEMP_EX(%a6){#1:#15},%d1 |get src exp (always neg) + subl %d1,%d0 |subtract src from dest + cmpl #0x8000,%d0 + blt fix_stk |if less, not wrap case + tstw FPTEMP_EX(%a6) |set N to sign_of(dest) + blt cmp_setn + rts +cmp_setn: + orl #neg_mask,USER_FPSR(%a6) + rts + +| +| Inst is fmul. +| +wrap_mul: + cmpb #0xff,DNRM_FLG(%a6) |if both ops denorm, + beq force_unf |force an underflow (really!) +| +| One of the ops is denormalized. Test for wrap condition +| and complete the instruction. +| + cmpb #0x0f,DNRM_FLG(%a6) |check for dest denorm + bnes mul_srcd +mul_destd: + bsrl ckinf_ns + bne fix_stk + bfextu ETEMP_EX(%a6){#1:#15},%d0 |get src exp (always pos) + bfexts FPTEMP_EX(%a6){#1:#15},%d1 |get dest exp (always neg) + addl %d1,%d0 |subtract dest from src + bgt fix_stk + bra force_unf +mul_srcd: + bsrl ckinf_nd + bne fix_stk + bfextu FPTEMP_EX(%a6){#1:#15},%d0 |get dest exp (always pos) + bfexts ETEMP_EX(%a6){#1:#15},%d1 |get src exp (always neg) + addl %d1,%d0 |subtract src from dest + bgt fix_stk + +| +| This code handles the case of the instruction resulting in +| an underflow condition. +| +force_unf: + bclrb #E1,E_BYTE(%a6) + orl #unfinx_mask,USER_FPSR(%a6) + clrw NMNEXC(%a6) + clrb WBTEMP_SGN(%a6) + movew ETEMP_EX(%a6),%d0 |find the sign of the result + movew FPTEMP_EX(%a6),%d1 + eorw %d1,%d0 + andiw #0x8000,%d0 + beqs frcunfcont + st WBTEMP_SGN(%a6) +frcunfcont: + lea WBTEMP(%a6),%a0 |point a0 to memory location + movew CMDREG1B(%a6),%d0 + btstl #6,%d0 |test for forced precision + beqs frcunf_fpcr + btstl #2,%d0 |check for double + bnes frcunf_dbl + movel #0x1,%d0 |inst is forced single + bras frcunf_rnd +frcunf_dbl: + movel #0x2,%d0 |inst is forced double + bras frcunf_rnd +frcunf_fpcr: + bfextu FPCR_MODE(%a6){#0:#2},%d0 |inst not forced - use fpcr prec +frcunf_rnd: + bsrl unf_sub |get correct result based on +| ;round precision/mode. This +| ;sets FPSR_CC correctly + bfclr WBTEMP_SGN(%a6){#0:#8} |convert back to IEEE ext format + beqs frcfpn + bsetb #sign_bit,WBTEMP_EX(%a6) + bra frcfpn + +| +| Write the result to the user's fpn. All results must be HUGE to be +| written; otherwise the results would have overflowed or underflowed. +| If the rounding precision is single or double, the ovf_res routine +| is needed to correctly supply the max value. +| +frcfpnr: + movew CMDREG1B(%a6),%d0 + btstl #6,%d0 |test for forced precision + beqs frcfpn_fpcr + btstl #2,%d0 |check for double + bnes frcfpn_dbl + movel #0x1,%d0 |inst is forced single + bras frcfpn_rnd +frcfpn_dbl: + movel #0x2,%d0 |inst is forced double + bras frcfpn_rnd +frcfpn_fpcr: + bfextu FPCR_MODE(%a6){#0:#2},%d0 |inst not forced - use fpcr prec + tstb %d0 + beqs frcfpn |if extended, write what you got +frcfpn_rnd: + bclrb #sign_bit,WBTEMP_EX(%a6) + sne WBTEMP_SGN(%a6) + bsrl ovf_res |get correct result based on +| ;round precision/mode. This +| ;sets FPSR_CC correctly + bfclr WBTEMP_SGN(%a6){#0:#8} |convert back to IEEE ext format + beqs frcfpn_clr + bsetb #sign_bit,WBTEMP_EX(%a6) +frcfpn_clr: + orl #ovfinx_mask,USER_FPSR(%a6) +| +| Perform the write. +| +frcfpn: + bfextu CMDREG1B(%a6){#6:#3},%d0 |extract fp destination register + cmpib #3,%d0 + bles frc0123 |check if dest is fp0-fp3 + movel #7,%d1 + subl %d0,%d1 + clrl %d0 + bsetl %d1,%d0 + fmovemx WBTEMP(%a6),%d0 + rts +frc0123: + cmpib #0,%d0 + beqs frc0_dst + cmpib #1,%d0 + beqs frc1_dst + cmpib #2,%d0 + beqs frc2_dst +frc3_dst: + movel WBTEMP_EX(%a6),USER_FP3(%a6) + movel WBTEMP_HI(%a6),USER_FP3+4(%a6) + movel WBTEMP_LO(%a6),USER_FP3+8(%a6) + rts +frc2_dst: + movel WBTEMP_EX(%a6),USER_FP2(%a6) + movel WBTEMP_HI(%a6),USER_FP2+4(%a6) + movel WBTEMP_LO(%a6),USER_FP2+8(%a6) + rts +frc1_dst: + movel WBTEMP_EX(%a6),USER_FP1(%a6) + movel WBTEMP_HI(%a6),USER_FP1+4(%a6) + movel WBTEMP_LO(%a6),USER_FP1+8(%a6) + rts +frc0_dst: + movel WBTEMP_EX(%a6),USER_FP0(%a6) + movel WBTEMP_HI(%a6),USER_FP0+4(%a6) + movel WBTEMP_LO(%a6),USER_FP0+8(%a6) + rts + +| +| Write etemp to fpn. +| A check is made on enabled and signalled snan exceptions, +| and the destination is not overwritten if this condition exists. +| This code is designed to make fmoveins of unsupported data types +| faster. +| +wr_etemp: + btstb #snan_bit,FPSR_EXCEPT(%a6) |if snan is set, and + beqs fmoveinc |enabled, force restore + btstb #snan_bit,FPCR_ENABLE(%a6) |and don't overwrite + beqs fmoveinc |the dest + movel ETEMP_EX(%a6),FPTEMP_EX(%a6) |set up fptemp sign for +| ;snan handler + tstb ETEMP(%a6) |check for negative + blts snan_neg + rts +snan_neg: + orl #neg_bit,USER_FPSR(%a6) |snan is negative; set N + rts +fmoveinc: + clrw NMNEXC(%a6) + bclrb #E1,E_BYTE(%a6) + moveb STAG(%a6),%d0 |check if stag is inf + andib #0xe0,%d0 + cmpib #0x40,%d0 + bnes fminc_cnan + orl #inf_mask,USER_FPSR(%a6) |if inf, nothing yet has set I + tstw LOCAL_EX(%a0) |check sign + bges fminc_con + orl #neg_mask,USER_FPSR(%a6) + bra fminc_con +fminc_cnan: + cmpib #0x60,%d0 |check if stag is NaN + bnes fminc_czero + orl #nan_mask,USER_FPSR(%a6) |if nan, nothing yet has set NaN + movel ETEMP_EX(%a6),FPTEMP_EX(%a6) |set up fptemp sign for +| ;snan handler + tstw LOCAL_EX(%a0) |check sign + bges fminc_con + orl #neg_mask,USER_FPSR(%a6) + bra fminc_con +fminc_czero: + cmpib #0x20,%d0 |check if zero + bnes fminc_con + orl #z_mask,USER_FPSR(%a6) |if zero, set Z + tstw LOCAL_EX(%a0) |check sign + bges fminc_con + orl #neg_mask,USER_FPSR(%a6) +fminc_con: + bfextu CMDREG1B(%a6){#6:#3},%d0 |extract fp destination register + cmpib #3,%d0 + bles fp0123 |check if dest is fp0-fp3 + movel #7,%d1 + subl %d0,%d1 + clrl %d0 + bsetl %d1,%d0 + fmovemx ETEMP(%a6),%d0 + rts + +fp0123: + cmpib #0,%d0 + beqs fp0_dst + cmpib #1,%d0 + beqs fp1_dst + cmpib #2,%d0 + beqs fp2_dst +fp3_dst: + movel ETEMP_EX(%a6),USER_FP3(%a6) + movel ETEMP_HI(%a6),USER_FP3+4(%a6) + movel ETEMP_LO(%a6),USER_FP3+8(%a6) + rts +fp2_dst: + movel ETEMP_EX(%a6),USER_FP2(%a6) + movel ETEMP_HI(%a6),USER_FP2+4(%a6) + movel ETEMP_LO(%a6),USER_FP2+8(%a6) + rts +fp1_dst: + movel ETEMP_EX(%a6),USER_FP1(%a6) + movel ETEMP_HI(%a6),USER_FP1+4(%a6) + movel ETEMP_LO(%a6),USER_FP1+8(%a6) + rts +fp0_dst: + movel ETEMP_EX(%a6),USER_FP0(%a6) + movel ETEMP_HI(%a6),USER_FP0+4(%a6) + movel ETEMP_LO(%a6),USER_FP0+8(%a6) + rts + +opclass3: + st CU_ONLY(%a6) + movew CMDREG1B(%a6),%d0 |check if packed moveout + andiw #0x0c00,%d0 |isolate last 2 bits of size field + cmpiw #0x0c00,%d0 |if size is 011 or 111, it is packed + beq pack_out |else it is norm or denorm + bra mv_out + + +| +| MOVE OUT +| + +mv_tbl: + .long li + .long sgp + .long xp + .long mvout_end |should never be taken + .long wi + .long dp + .long bi + .long mvout_end |should never be taken +mv_out: + bfextu CMDREG1B(%a6){#3:#3},%d1 |put source specifier in d1 + leal mv_tbl,%a0 + movel %a0@(%d1:l:4),%a0 + jmp (%a0) + +| +| This exit is for move-out to memory. The aunfl bit is +| set if the result is inex and unfl is signalled. +| +mvout_end: + btstb #inex2_bit,FPSR_EXCEPT(%a6) + beqs no_aufl + btstb #unfl_bit,FPSR_EXCEPT(%a6) + beqs no_aufl + bsetb #aunfl_bit,FPSR_AEXCEPT(%a6) +no_aufl: + clrw NMNEXC(%a6) + bclrb #E1,E_BYTE(%a6) + fmovel #0,%FPSR |clear any cc bits from res_func +| +| Return ETEMP to extended format from internal extended format so +| that gen_except will have a correctly signed value for ovfl/unfl +| handlers. +| + bfclr ETEMP_SGN(%a6){#0:#8} + beqs mvout_con + bsetb #sign_bit,ETEMP_EX(%a6) +mvout_con: + rts +| +| This exit is for move-out to int register. The aunfl bit is +| not set in any case for this move. +| +mvouti_end: + clrw NMNEXC(%a6) + bclrb #E1,E_BYTE(%a6) + fmovel #0,%FPSR |clear any cc bits from res_func +| +| Return ETEMP to extended format from internal extended format so +| that gen_except will have a correctly signed value for ovfl/unfl +| handlers. +| + bfclr ETEMP_SGN(%a6){#0:#8} + beqs mvouti_con + bsetb #sign_bit,ETEMP_EX(%a6) +mvouti_con: + rts +| +| li is used to handle a long integer source specifier +| + +li: + moveql #4,%d0 |set byte count + + btstb #7,STAG(%a6) |check for extended denorm + bne int_dnrm |if so, branch + + fmovemx ETEMP(%a6),%fp0-%fp0 + fcmpd #0x41dfffffffc00000,%fp0 +| 41dfffffffc00000 in dbl prec = 401d0000fffffffe00000000 in ext prec + fbge lo_plrg + fcmpd #0xc1e0000000000000,%fp0 +| c1e0000000000000 in dbl prec = c01e00008000000000000000 in ext prec + fble lo_nlrg +| +| at this point, the answer is between the largest pos and neg values +| + movel USER_FPCR(%a6),%d1 |use user's rounding mode + andil #0x30,%d1 + fmovel %d1,%fpcr + fmovel %fp0,L_SCR1(%a6) |let the 040 perform conversion + fmovel %fpsr,%d1 + orl %d1,USER_FPSR(%a6) |capture inex2/ainex if set + bra int_wrt + + +lo_plrg: + movel #0x7fffffff,L_SCR1(%a6) |answer is largest positive int + fbeq int_wrt |exact answer + fcmpd #0x41dfffffffe00000,%fp0 +| 41dfffffffe00000 in dbl prec = 401d0000ffffffff00000000 in ext prec + fbge int_operr |set operr + bra int_inx |set inexact + +lo_nlrg: + movel #0x80000000,L_SCR1(%a6) + fbeq int_wrt |exact answer + fcmpd #0xc1e0000000100000,%fp0 +| c1e0000000100000 in dbl prec = c01e00008000000080000000 in ext prec + fblt int_operr |set operr + bra int_inx |set inexact + +| +| wi is used to handle a word integer source specifier +| + +wi: + moveql #2,%d0 |set byte count + + btstb #7,STAG(%a6) |check for extended denorm + bne int_dnrm |branch if so + + fmovemx ETEMP(%a6),%fp0-%fp0 + fcmps #0x46fffe00,%fp0 +| 46fffe00 in sgl prec = 400d0000fffe000000000000 in ext prec + fbge wo_plrg + fcmps #0xc7000000,%fp0 +| c7000000 in sgl prec = c00e00008000000000000000 in ext prec + fble wo_nlrg + +| +| at this point, the answer is between the largest pos and neg values +| + movel USER_FPCR(%a6),%d1 |use user's rounding mode + andil #0x30,%d1 + fmovel %d1,%fpcr + fmovew %fp0,L_SCR1(%a6) |let the 040 perform conversion + fmovel %fpsr,%d1 + orl %d1,USER_FPSR(%a6) |capture inex2/ainex if set + bra int_wrt + +wo_plrg: + movew #0x7fff,L_SCR1(%a6) |answer is largest positive int + fbeq int_wrt |exact answer + fcmps #0x46ffff00,%fp0 +| 46ffff00 in sgl prec = 400d0000ffff000000000000 in ext prec + fbge int_operr |set operr + bra int_inx |set inexact + +wo_nlrg: + movew #0x8000,L_SCR1(%a6) + fbeq int_wrt |exact answer + fcmps #0xc7000080,%fp0 +| c7000080 in sgl prec = c00e00008000800000000000 in ext prec + fblt int_operr |set operr + bra int_inx |set inexact + +| +| bi is used to handle a byte integer source specifier +| + +bi: + moveql #1,%d0 |set byte count + + btstb #7,STAG(%a6) |check for extended denorm + bne int_dnrm |branch if so + + fmovemx ETEMP(%a6),%fp0-%fp0 + fcmps #0x42fe0000,%fp0 +| 42fe0000 in sgl prec = 40050000fe00000000000000 in ext prec + fbge by_plrg + fcmps #0xc3000000,%fp0 +| c3000000 in sgl prec = c00600008000000000000000 in ext prec + fble by_nlrg + +| +| at this point, the answer is between the largest pos and neg values +| + movel USER_FPCR(%a6),%d1 |use user's rounding mode + andil #0x30,%d1 + fmovel %d1,%fpcr + fmoveb %fp0,L_SCR1(%a6) |let the 040 perform conversion + fmovel %fpsr,%d1 + orl %d1,USER_FPSR(%a6) |capture inex2/ainex if set + bra int_wrt + +by_plrg: + moveb #0x7f,L_SCR1(%a6) |answer is largest positive int + fbeq int_wrt |exact answer + fcmps #0x42ff0000,%fp0 +| 42ff0000 in sgl prec = 40050000ff00000000000000 in ext prec + fbge int_operr |set operr + bra int_inx |set inexact + +by_nlrg: + moveb #0x80,L_SCR1(%a6) + fbeq int_wrt |exact answer + fcmps #0xc3008000,%fp0 +| c3008000 in sgl prec = c00600008080000000000000 in ext prec + fblt int_operr |set operr + bra int_inx |set inexact + +| +| Common integer routines +| +| int_drnrm---account for possible nonzero result for round up with positive +| operand and round down for negative answer. In the first case (result = 1) +| byte-width (store in d0) of result must be honored. In the second case, +| -1 in L_SCR1(a6) will cover all contingencies (FMOVE.B/W/L out). + +int_dnrm: + movel #0,L_SCR1(%a6) | initialize result to 0 + bfextu FPCR_MODE(%a6){#2:#2},%d1 | d1 is the rounding mode + cmpb #2,%d1 + bmis int_inx | if RN or RZ, done + bnes int_rp | if RP, continue below + tstw ETEMP(%a6) | RM: store -1 in L_SCR1 if src is negative + bpls int_inx | otherwise result is 0 + movel #-1,L_SCR1(%a6) + bras int_inx +int_rp: + tstw ETEMP(%a6) | RP: store +1 of proper width in L_SCR1 if +| ; source is greater than 0 + bmis int_inx | otherwise, result is 0 + lea L_SCR1(%a6),%a1 | a1 is address of L_SCR1 + addal %d0,%a1 | offset by destination width -1 + subal #1,%a1 + bsetb #0,(%a1) | set low bit at a1 address +int_inx: + oril #inx2a_mask,USER_FPSR(%a6) + bras int_wrt +int_operr: + fmovemx %fp0-%fp0,FPTEMP(%a6) |FPTEMP must contain the extended +| ;precision source that needs to be +| ;converted to integer this is required +| ;if the operr exception is enabled. +| ;set operr/aiop (no inex2 on int ovfl) + + oril #opaop_mask,USER_FPSR(%a6) +| ;fall through to perform int_wrt +int_wrt: + movel EXC_EA(%a6),%a1 |load destination address + tstl %a1 |check to see if it is a dest register + beqs wrt_dn |write data register + lea L_SCR1(%a6),%a0 |point to supervisor source address + bsrl mem_write + bra mvouti_end + +wrt_dn: + movel %d0,-(%sp) |d0 currently contains the size to write + bsrl get_fline |get_fline returns Dn in d0 + andiw #0x7,%d0 |isolate register + movel (%sp)+,%d1 |get size + cmpil #4,%d1 |most frequent case + beqs sz_long + cmpil #2,%d1 + bnes sz_con + orl #8,%d0 |add 'word' size to register# + bras sz_con +sz_long: + orl #0x10,%d0 |add 'long' size to register# +sz_con: + movel %d0,%d1 |reg_dest expects size:reg in d1 + bsrl reg_dest |load proper data register + bra mvouti_end +xp: + lea ETEMP(%a6),%a0 + bclrb #sign_bit,LOCAL_EX(%a0) + sne LOCAL_SGN(%a0) + btstb #7,STAG(%a6) |check for extended denorm + bne xdnrm + clrl %d0 + bras do_fp |do normal case +sgp: + lea ETEMP(%a6),%a0 + bclrb #sign_bit,LOCAL_EX(%a0) + sne LOCAL_SGN(%a0) + btstb #7,STAG(%a6) |check for extended denorm + bne sp_catas |branch if so + movew LOCAL_EX(%a0),%d0 + lea sp_bnds,%a1 + cmpw (%a1),%d0 + blt sp_under + cmpw 2(%a1),%d0 + bgt sp_over + movel #1,%d0 |set destination format to single + bras do_fp |do normal case +dp: + lea ETEMP(%a6),%a0 + bclrb #sign_bit,LOCAL_EX(%a0) + sne LOCAL_SGN(%a0) + + btstb #7,STAG(%a6) |check for extended denorm + bne dp_catas |branch if so + + movew LOCAL_EX(%a0),%d0 + lea dp_bnds,%a1 + + cmpw (%a1),%d0 + blt dp_under + cmpw 2(%a1),%d0 + bgt dp_over + + movel #2,%d0 |set destination format to double +| ;fall through to do_fp +| +do_fp: + bfextu FPCR_MODE(%a6){#2:#2},%d1 |rnd mode in d1 + swap %d0 |rnd prec in upper word + addl %d0,%d1 |d1 has PREC/MODE info + + clrl %d0 |clear g,r,s + + bsrl round |round + + movel %a0,%a1 + movel EXC_EA(%a6),%a0 + + bfextu CMDREG1B(%a6){#3:#3},%d1 |extract destination format +| ;at this point only the dest +| ;formats sgl, dbl, ext are +| ;possible + cmpb #2,%d1 + bgts ddbl |double=5, extended=2, single=1 + bnes dsgl +| ;fall through to dext +dext: + bsrl dest_ext + bra mvout_end +dsgl: + bsrl dest_sgl + bra mvout_end +ddbl: + bsrl dest_dbl + bra mvout_end + +| +| Handle possible denorm or catastrophic underflow cases here +| +xdnrm: + bsr set_xop |initialize WBTEMP + bsetb #wbtemp15_bit,WB_BYTE(%a6) |set wbtemp15 + + movel %a0,%a1 + movel EXC_EA(%a6),%a0 |a0 has the destination pointer + bsrl dest_ext |store to memory + bsetb #unfl_bit,FPSR_EXCEPT(%a6) + bra mvout_end + +sp_under: + bsetb #etemp15_bit,STAG(%a6) + + cmpw 4(%a1),%d0 + blts sp_catas |catastrophic underflow case + + movel #1,%d0 |load in round precision + movel #sgl_thresh,%d1 |load in single denorm threshold + bsrl dpspdnrm |expects d1 to have the proper +| ;denorm threshold + bsrl dest_sgl |stores value to destination + bsetb #unfl_bit,FPSR_EXCEPT(%a6) + bra mvout_end |exit + +dp_under: + bsetb #etemp15_bit,STAG(%a6) + + cmpw 4(%a1),%d0 + blts dp_catas |catastrophic underflow case + + movel #dbl_thresh,%d1 |load in double precision threshold + movel #2,%d0 + bsrl dpspdnrm |expects d1 to have proper +| ;denorm threshold +| ;expects d0 to have round precision + bsrl dest_dbl |store value to destination + bsetb #unfl_bit,FPSR_EXCEPT(%a6) + bra mvout_end |exit + +| +| Handle catastrophic underflow cases here +| +sp_catas: +| Temp fix for z bit set in unf_sub + movel USER_FPSR(%a6),-(%a7) + + movel #1,%d0 |set round precision to sgl + + bsrl unf_sub |a0 points to result + + movel (%a7)+,USER_FPSR(%a6) + + movel #1,%d0 + subw %d0,LOCAL_EX(%a0) |account for difference between +| ;denorm/norm bias + + movel %a0,%a1 |a1 has the operand input + movel EXC_EA(%a6),%a0 |a0 has the destination pointer + + bsrl dest_sgl |store the result + oril #unfinx_mask,USER_FPSR(%a6) + bra mvout_end + +dp_catas: +| Temp fix for z bit set in unf_sub + movel USER_FPSR(%a6),-(%a7) + + movel #2,%d0 |set round precision to dbl + bsrl unf_sub |a0 points to result + + movel (%a7)+,USER_FPSR(%a6) + + movel #1,%d0 + subw %d0,LOCAL_EX(%a0) |account for difference between +| ;denorm/norm bias + + movel %a0,%a1 |a1 has the operand input + movel EXC_EA(%a6),%a0 |a0 has the destination pointer + + bsrl dest_dbl |store the result + oril #unfinx_mask,USER_FPSR(%a6) + bra mvout_end + +| +| Handle catastrophic overflow cases here +| +sp_over: +| Temp fix for z bit set in unf_sub + movel USER_FPSR(%a6),-(%a7) + + movel #1,%d0 + leal FP_SCR1(%a6),%a0 |use FP_SCR1 for creating result + movel ETEMP_EX(%a6),(%a0) + movel ETEMP_HI(%a6),4(%a0) + movel ETEMP_LO(%a6),8(%a0) + bsrl ovf_res + + movel (%a7)+,USER_FPSR(%a6) + + movel %a0,%a1 + movel EXC_EA(%a6),%a0 + bsrl dest_sgl + orl #ovfinx_mask,USER_FPSR(%a6) + bra mvout_end + +dp_over: +| Temp fix for z bit set in ovf_res + movel USER_FPSR(%a6),-(%a7) + + movel #2,%d0 + leal FP_SCR1(%a6),%a0 |use FP_SCR1 for creating result + movel ETEMP_EX(%a6),(%a0) + movel ETEMP_HI(%a6),4(%a0) + movel ETEMP_LO(%a6),8(%a0) + bsrl ovf_res + + movel (%a7)+,USER_FPSR(%a6) + + movel %a0,%a1 + movel EXC_EA(%a6),%a0 + bsrl dest_dbl + orl #ovfinx_mask,USER_FPSR(%a6) + bra mvout_end + +| +| DPSPDNRM +| +| This subroutine takes an extended normalized number and denormalizes +| it to the given round precision. This subroutine also decrements +| the input operand's exponent by 1 to account for the fact that +| dest_sgl or dest_dbl expects a normalized number's bias. +| +| Input: a0 points to a normalized number in internal extended format +| d0 is the round precision (=1 for sgl; =2 for dbl) +| d1 is the single precision or double precision +| denorm threshold +| +| Output: (In the format for dest_sgl or dest_dbl) +| a0 points to the destination +| a1 points to the operand +| +| Exceptions: Reports inexact 2 exception by setting USER_FPSR bits +| +dpspdnrm: + movel %d0,-(%a7) |save round precision + clrl %d0 |clear initial g,r,s + bsrl dnrm_lp |careful with d0, it's needed by round + + bfextu FPCR_MODE(%a6){#2:#2},%d1 |get rounding mode + swap %d1 + movew 2(%a7),%d1 |set rounding precision + swap %d1 |at this point d1 has PREC/MODE info + bsrl round |round result, sets the inex bit in +| ;USER_FPSR if needed + + movew #1,%d0 + subw %d0,LOCAL_EX(%a0) |account for difference in denorm +| ;vs norm bias + + movel %a0,%a1 |a1 has the operand input + movel EXC_EA(%a6),%a0 |a0 has the destination pointer + addw #4,%a7 |pop stack + rts +| +| SET_XOP initialized WBTEMP with the value pointed to by a0 +| input: a0 points to input operand in the internal extended format +| +set_xop: + movel LOCAL_EX(%a0),WBTEMP_EX(%a6) + movel LOCAL_HI(%a0),WBTEMP_HI(%a6) + movel LOCAL_LO(%a0),WBTEMP_LO(%a6) + bfclr WBTEMP_SGN(%a6){#0:#8} + beqs sxop + bsetb #sign_bit,WBTEMP_EX(%a6) +sxop: + bfclr STAG(%a6){#5:#4} |clear wbtm66,wbtm1,wbtm0,sbit + rts +| +| P_MOVE +| +p_movet: + .long p_move + .long p_movez + .long p_movei + .long p_moven + .long p_move +p_regd: + .long p_dyd0 + .long p_dyd1 + .long p_dyd2 + .long p_dyd3 + .long p_dyd4 + .long p_dyd5 + .long p_dyd6 + .long p_dyd7 + +pack_out: + leal p_movet,%a0 |load jmp table address + movew STAG(%a6),%d0 |get source tag + bfextu %d0{#16:#3},%d0 |isolate source bits + movel (%a0,%d0.w*4),%a0 |load a0 with routine label for tag + jmp (%a0) |go to the routine + +p_write: + movel #0x0c,%d0 |get byte count + movel EXC_EA(%a6),%a1 |get the destination address + bsr mem_write |write the user's destination + moveb #0,CU_SAVEPC(%a6) |set the cu save pc to all 0's + +| +| Also note that the dtag must be set to norm here - this is because +| the 040 uses the dtag to execute the correct microcode. +| + bfclr DTAG(%a6){#0:#3} |set dtag to norm + + rts + +| Notes on handling of special case (zero, inf, and nan) inputs: +| 1. Operr is not signalled if the k-factor is greater than 18. +| 2. Per the manual, status bits are not set. +| + +p_move: + movew CMDREG1B(%a6),%d0 + btstl #kfact_bit,%d0 |test for dynamic k-factor + beqs statick |if clear, k-factor is static +dynamick: + bfextu %d0{#25:#3},%d0 |isolate register for dynamic k-factor + lea p_regd,%a0 + movel %a0@(%d0:l:4),%a0 + jmp (%a0) +statick: + andiw #0x007f,%d0 |get k-factor + bfexts %d0{#25:#7},%d0 |sign extend d0 for bindec + leal ETEMP(%a6),%a0 |a0 will point to the packed decimal + bsrl bindec |perform the convert; data at a6 + leal FP_SCR1(%a6),%a0 |load a0 with result address + bral p_write +p_movez: + leal ETEMP(%a6),%a0 |a0 will point to the packed decimal + clrw 2(%a0) |clear lower word of exp + clrl 4(%a0) |load second lword of ZERO + clrl 8(%a0) |load third lword of ZERO + bra p_write |go write results +p_movei: + fmovel #0,%FPSR |clear aiop + leal ETEMP(%a6),%a0 |a0 will point to the packed decimal + clrw 2(%a0) |clear lower word of exp + bra p_write |go write the result +p_moven: + leal ETEMP(%a6),%a0 |a0 will point to the packed decimal + clrw 2(%a0) |clear lower word of exp + bra p_write |go write the result + +| +| Routines to read the dynamic k-factor from Dn. +| +p_dyd0: + movel USER_D0(%a6),%d0 + bras statick +p_dyd1: + movel USER_D1(%a6),%d0 + bras statick +p_dyd2: + movel %d2,%d0 + bras statick +p_dyd3: + movel %d3,%d0 + bras statick +p_dyd4: + movel %d4,%d0 + bras statick +p_dyd5: + movel %d5,%d0 + bras statick +p_dyd6: + movel %d6,%d0 + bra statick +p_dyd7: + movel %d7,%d0 + bra statick + + |end |