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Diffstat (limited to 'arch/hexagon/lib/memcpy.S')
| -rw-r--r-- | arch/hexagon/lib/memcpy.S | 543 |
1 files changed, 543 insertions, 0 deletions
diff --git a/arch/hexagon/lib/memcpy.S b/arch/hexagon/lib/memcpy.S new file mode 100644 index 000000000..a46093a88 --- /dev/null +++ b/arch/hexagon/lib/memcpy.S @@ -0,0 +1,543 @@ +/* + * Copyright (c) 2010-2011, The Linux Foundation. All rights reserved. + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 and + * only version 2 as published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA + * 02110-1301, USA. + */ + +/* + * Description + * + * library function for memcpy where length bytes are copied from + * ptr_in to ptr_out. ptr_out is returned unchanged. + * Allows any combination of alignment on input and output pointers + * and length from 0 to 2^32-1 + * + * Restrictions + * The arrays should not overlap, the program will produce undefined output + * if they do. + * For blocks less than 16 bytes a byte by byte copy is performed. For + * 8byte alignments, and length multiples, a dword copy is performed up to + * 96bytes + * History + * + * DJH 5/15/09 Initial version 1.0 + * DJH 6/ 1/09 Version 1.1 modified ABI to inlcude R16-R19 + * DJH 7/12/09 Version 1.2 optimized codesize down to 760 was 840 + * DJH 10/14/09 Version 1.3 added special loop for aligned case, was + * overreading bloated codesize back up to 892 + * DJH 4/20/10 Version 1.4 fixed Ldword_loop_epilog loop to prevent loads + * occurring if only 1 left outstanding, fixes bug + * # 3888, corrected for all alignments. Peeled off + * 1 32byte chunk from kernel loop and extended 8byte + * loop at end to solve all combinations and prevent + * over read. Fixed Ldword_loop_prolog to prevent + * overread for blocks less than 48bytes. Reduced + * codesize to 752 bytes + * DJH 4/21/10 version 1.5 1.4 fix broke code for input block ends not + * aligned to dword boundaries,underwriting by 1 + * byte, added detection for this and fixed. A + * little bloat. + * DJH 4/23/10 version 1.6 corrected stack error, R20 was not being restored + * always, fixed the error of R20 being modified + * before it was being saved + * Natural c model + * =============== + * void * memcpy(char * ptr_out, char * ptr_in, int length) { + * int i; + * if(length) for(i=0; i < length; i++) { ptr_out[i] = ptr_in[i]; } + * return(ptr_out); + * } + * + * Optimized memcpy function + * ========================= + * void * memcpy(char * ptr_out, char * ptr_in, int len) { + * int i, prolog, kernel, epilog, mask; + * u8 offset; + * s64 data0, dataF8, data70; + * + * s64 * ptr8_in; + * s64 * ptr8_out; + * s32 * ptr4; + * s16 * ptr2; + * + * offset = ((int) ptr_in) & 7; + * ptr8_in = (s64 *) &ptr_in[-offset]; //read in the aligned pointers + * + * data70 = *ptr8_in++; + * dataF8 = *ptr8_in++; + * + * data0 = HEXAGON_P_valignb_PPp(dataF8, data70, offset); + * + * prolog = 32 - ((int) ptr_out); + * mask = 0x7fffffff >> HEXAGON_R_cl0_R(len); + * prolog = prolog & mask; + * kernel = len - prolog; + * epilog = kernel & 0x1F; + * kernel = kernel>>5; + * + * if (prolog & 1) { ptr_out[0] = (u8) data0; data0 >>= 8; ptr_out += 1;} + * ptr2 = (s16 *) &ptr_out[0]; + * if (prolog & 2) { ptr2[0] = (u16) data0; data0 >>= 16; ptr_out += 2;} + * ptr4 = (s32 *) &ptr_out[0]; + * if (prolog & 4) { ptr4[0] = (u32) data0; data0 >>= 32; ptr_out += 4;} + * + * offset = offset + (prolog & 7); + * if (offset >= 8) { + * data70 = dataF8; + * dataF8 = *ptr8_in++; + * } + * offset = offset & 0x7; + * + * prolog = prolog >> 3; + * if (prolog) for (i=0; i < prolog; i++) { + * data0 = HEXAGON_P_valignb_PPp(dataF8, data70, offset); + * ptr8_out = (s64 *) &ptr_out[0]; *ptr8_out = data0; ptr_out += 8; + * data70 = dataF8; + * dataF8 = *ptr8_in++; + * } + * if(kernel) { kernel -= 1; epilog += 32; } + * if(kernel) for(i=0; i < kernel; i++) { + * data0 = HEXAGON_P_valignb_PPp(dataF8, data70, offset); + * ptr8_out = (s64 *) &ptr_out[0]; *ptr8_out = data0; ptr_out += 8; + * data70 = *ptr8_in++; + * + * data0 = HEXAGON_P_valignb_PPp(data70, dataF8, offset); + * ptr8_out = (s64 *) &ptr_out[0]; *ptr8_out = data0; ptr_out += 8; + * dataF8 = *ptr8_in++; + * + * data0 = HEXAGON_P_valignb_PPp(dataF8, data70, offset); + * ptr8_out = (s64 *) &ptr_out[0]; *ptr8_out = data0; ptr_out += 8; + * data70 = *ptr8_in++; + * + * data0 = HEXAGON_P_valignb_PPp(data70, dataF8, offset); + * ptr8_out = (s64 *) &ptr_out[0]; *ptr8_out = data0; ptr_out += 8; + * dataF8 = *ptr8_in++; + * } + * epilogdws = epilog >> 3; + * if (epilogdws) for (i=0; i < epilogdws; i++) { + * data0 = HEXAGON_P_valignb_PPp(dataF8, data70, offset); + * ptr8_out = (s64 *) &ptr_out[0]; *ptr8_out = data0; ptr_out += 8; + * data70 = dataF8; + * dataF8 = *ptr8_in++; + * } + * data0 = HEXAGON_P_valignb_PPp(dataF8, data70, offset); + * + * ptr4 = (s32 *) &ptr_out[0]; + * if (epilog & 4) { ptr4[0] = (u32) data0; data0 >>= 32; ptr_out += 4;} + * ptr2 = (s16 *) &ptr_out[0]; + * if (epilog & 2) { ptr2[0] = (u16) data0; data0 >>= 16; ptr_out += 2;} + * if (epilog & 1) { *ptr_out++ = (u8) data0; } + * + * return(ptr_out - length); + * } + * + * Codesize : 784 bytes + */ + + +#define ptr_out R0 /* destination pounter */ +#define ptr_in R1 /* source pointer */ +#define len R2 /* length of copy in bytes */ + +#define data70 R13:12 /* lo 8 bytes of non-aligned transfer */ +#define dataF8 R11:10 /* hi 8 bytes of non-aligned transfer */ +#define ldata0 R7:6 /* even 8 bytes chunks */ +#define ldata1 R25:24 /* odd 8 bytes chunks */ +#define data1 R7 /* lower 8 bytes of ldata1 */ +#define data0 R6 /* lower 8 bytes of ldata0 */ + +#define ifbyte p0 /* if transfer has bytes in epilog/prolog */ +#define ifhword p0 /* if transfer has shorts in epilog/prolog */ +#define ifword p0 /* if transfer has words in epilog/prolog */ +#define noprolog p0 /* no prolog, xfer starts at 32byte */ +#define nokernel p1 /* no 32byte multiple block in the transfer */ +#define noepilog p0 /* no epilog, xfer ends on 32byte boundary */ +#define align p2 /* alignment of input rel to 8byte boundary */ +#define kernel1 p0 /* kernel count == 1 */ + +#define dalign R25 /* rel alignment of input to output data */ +#define star3 R16 /* number bytes in prolog - dwords */ +#define rest R8 /* length - prolog bytes */ +#define back R7 /* nr bytes > dword boundary in src block */ +#define epilog R3 /* bytes in epilog */ +#define inc R15:14 /* inc kernel by -1 and defetch ptr by 32 */ +#define kernel R4 /* number of 32byte chunks in kernel */ +#define ptr_in_p_128 R5 /* pointer for prefetch of input data */ +#define mask R8 /* mask used to determine prolog size */ +#define shift R8 /* used to work a shifter to extract bytes */ +#define shift2 R5 /* in epilog to workshifter to extract bytes */ +#define prolog R15 /* bytes in prolog */ +#define epilogdws R15 /* number dwords in epilog */ +#define shiftb R14 /* used to extract bytes */ +#define offset R9 /* same as align in reg */ +#define ptr_out_p_32 R17 /* pointer to output dczero */ +#define align888 R14 /* if simple dword loop can be used */ +#define len8 R9 /* number of dwords in length */ +#define over R20 /* nr of bytes > last inp buf dword boundary */ + +#define ptr_in_p_128kernel R5:4 /* packed fetch pointer & kernel cnt */ + + .section .text + .p2align 4 + .global memcpy + .type memcpy, @function +memcpy: +{ + p2 = cmp.eq(len, #0); /* =0 */ + align888 = or(ptr_in, ptr_out); /* %8 < 97 */ + p0 = cmp.gtu(len, #23); /* %1, <24 */ + p1 = cmp.eq(ptr_in, ptr_out); /* attempt to overwrite self */ +} +{ + p1 = or(p2, p1); + p3 = cmp.gtu(len, #95); /* %8 < 97 */ + align888 = or(align888, len); /* %8 < 97 */ + len8 = lsr(len, #3); /* %8 < 97 */ +} +{ + dcfetch(ptr_in); /* zero/ptrin=ptrout causes fetch */ + p2 = bitsclr(align888, #7); /* %8 < 97 */ + if(p1) jumpr r31; /* =0 */ +} +{ + p2 = and(p2,!p3); /* %8 < 97 */ + if (p2.new) len = add(len, #-8); /* %8 < 97 */ + if (p2.new) jump:NT .Ldwordaligned; /* %8 < 97 */ +} +{ + if(!p0) jump .Lbytes23orless; /* %1, <24 */ + mask.l = #LO(0x7fffffff); + /* all bytes before line multiples of data */ + prolog = sub(#0, ptr_out); +} +{ + /* save r31 on stack, decrement sp by 16 */ + allocframe(#24); + mask.h = #HI(0x7fffffff); + ptr_in_p_128 = add(ptr_in, #32); + back = cl0(len); +} +{ + memd(sp+#0) = R17:16; /* save r16,r17 on stack6 */ + r31.l = #LO(.Lmemcpy_return); /* set up final return pointer */ + prolog &= lsr(mask, back); + offset = and(ptr_in, #7); +} +{ + memd(sp+#8) = R25:24; /* save r25,r24 on stack */ + dalign = sub(ptr_out, ptr_in); + r31.h = #HI(.Lmemcpy_return); /* set up final return pointer */ +} +{ + /* see if there if input buffer end if aligned */ + over = add(len, ptr_in); + back = add(len, offset); + memd(sp+#16) = R21:20; /* save r20,r21 on stack */ +} +{ + noprolog = bitsclr(prolog, #7); + prolog = and(prolog, #31); + dcfetch(ptr_in_p_128); + ptr_in_p_128 = add(ptr_in_p_128, #32); +} +{ + kernel = sub(len, prolog); + shift = asl(prolog, #3); + star3 = and(prolog, #7); + ptr_in = and(ptr_in, #-8); +} +{ + prolog = lsr(prolog, #3); + epilog = and(kernel, #31); + ptr_out_p_32 = add(ptr_out, prolog); + over = and(over, #7); +} +{ + p3 = cmp.gtu(back, #8); + kernel = lsr(kernel, #5); + dcfetch(ptr_in_p_128); + ptr_in_p_128 = add(ptr_in_p_128, #32); +} +{ + p1 = cmp.eq(prolog, #0); + if(!p1.new) prolog = add(prolog, #1); + dcfetch(ptr_in_p_128); /* reserve the line 64bytes on */ + ptr_in_p_128 = add(ptr_in_p_128, #32); +} +{ + nokernel = cmp.eq(kernel,#0); + dcfetch(ptr_in_p_128); /* reserve the line 64bytes on */ + ptr_in_p_128 = add(ptr_in_p_128, #32); + shiftb = and(shift, #8); +} +{ + dcfetch(ptr_in_p_128); /* reserve the line 64bytes on */ + ptr_in_p_128 = add(ptr_in_p_128, #32); + if(nokernel) jump .Lskip64; + p2 = cmp.eq(kernel, #1); /* skip ovr if kernel == 0 */ +} +{ + dczeroa(ptr_out_p_32); + /* don't advance pointer */ + if(!p2) ptr_out_p_32 = add(ptr_out_p_32, #32); +} +{ + dalign = and(dalign, #31); + dczeroa(ptr_out_p_32); +} +.Lskip64: +{ + data70 = memd(ptr_in++#16); + if(p3) dataF8 = memd(ptr_in+#8); + if(noprolog) jump .Lnoprolog32; + align = offset; +} +/* upto initial 7 bytes */ +{ + ldata0 = valignb(dataF8, data70, align); + ifbyte = tstbit(shift,#3); + offset = add(offset, star3); +} +{ + if(ifbyte) memb(ptr_out++#1) = data0; + ldata0 = lsr(ldata0, shiftb); + shiftb = and(shift, #16); + ifhword = tstbit(shift,#4); +} +{ + if(ifhword) memh(ptr_out++#2) = data0; + ldata0 = lsr(ldata0, shiftb); + ifword = tstbit(shift,#5); + p2 = cmp.gtu(offset, #7); +} +{ + if(ifword) memw(ptr_out++#4) = data0; + if(p2) data70 = dataF8; + if(p2) dataF8 = memd(ptr_in++#8); /* another 8 bytes */ + align = offset; +} +.Lnoprolog32: +{ + p3 = sp1loop0(.Ldword_loop_prolog, prolog) + rest = sub(len, star3); /* whats left after the loop */ + p0 = cmp.gt(over, #0); +} + if(p0) rest = add(rest, #16); +.Ldword_loop_prolog: +{ + if(p3) memd(ptr_out++#8) = ldata0; + ldata0 = valignb(dataF8, data70, align); + p0 = cmp.gt(rest, #16); +} +{ + data70 = dataF8; + if(p0) dataF8 = memd(ptr_in++#8); + rest = add(rest, #-8); +}:endloop0 +.Lkernel: +{ + /* kernel is at least 32bytes */ + p3 = cmp.gtu(kernel, #0); + /* last itn. remove edge effects */ + if(p3.new) kernel = add(kernel, #-1); + /* dealt with in last dword loop */ + if(p3.new) epilog = add(epilog, #32); +} +{ + nokernel = cmp.eq(kernel, #0); /* after adjustment, recheck */ + if(nokernel.new) jump:NT .Lepilog; /* likely not taken */ + inc = combine(#32, #-1); + p3 = cmp.gtu(dalign, #24); +} +{ + if(p3) jump .Lodd_alignment; +} +{ + loop0(.Loword_loop_25to31, kernel); + kernel1 = cmp.gtu(kernel, #1); + rest = kernel; +} + .falign +.Loword_loop_25to31: +{ + dcfetch(ptr_in_p_128); /* prefetch 4 lines ahead */ + if(kernel1) ptr_out_p_32 = add(ptr_out_p_32, #32); +} +{ + dczeroa(ptr_out_p_32); /* reserve the next 32bytes in cache */ + p3 = cmp.eq(kernel, rest); +} +{ + /* kernel -= 1 */ + ptr_in_p_128kernel = vaddw(ptr_in_p_128kernel, inc); + /* kill write on first iteration */ + if(!p3) memd(ptr_out++#8) = ldata1; + ldata1 = valignb(dataF8, data70, align); + data70 = memd(ptr_in++#8); +} +{ + memd(ptr_out++#8) = ldata0; + ldata0 = valignb(data70, dataF8, align); + dataF8 = memd(ptr_in++#8); +} +{ + memd(ptr_out++#8) = ldata1; + ldata1 = valignb(dataF8, data70, align); + data70 = memd(ptr_in++#8); +} +{ + memd(ptr_out++#8) = ldata0; + ldata0 = valignb(data70, dataF8, align); + dataF8 = memd(ptr_in++#8); + kernel1 = cmp.gtu(kernel, #1); +}:endloop0 +{ + memd(ptr_out++#8) = ldata1; + jump .Lepilog; +} +.Lodd_alignment: +{ + loop0(.Loword_loop_00to24, kernel); + kernel1 = cmp.gtu(kernel, #1); + rest = add(kernel, #-1); +} + .falign +.Loword_loop_00to24: +{ + dcfetch(ptr_in_p_128); /* prefetch 4 lines ahead */ + ptr_in_p_128kernel = vaddw(ptr_in_p_128kernel, inc); + if(kernel1) ptr_out_p_32 = add(ptr_out_p_32, #32); +} +{ + dczeroa(ptr_out_p_32); /* reserve the next 32bytes in cache */ +} +{ + memd(ptr_out++#8) = ldata0; + ldata0 = valignb(dataF8, data70, align); + data70 = memd(ptr_in++#8); +} +{ + memd(ptr_out++#8) = ldata0; + ldata0 = valignb(data70, dataF8, align); + dataF8 = memd(ptr_in++#8); +} +{ + memd(ptr_out++#8) = ldata0; + ldata0 = valignb(dataF8, data70, align); + data70 = memd(ptr_in++#8); +} +{ + memd(ptr_out++#8) = ldata0; + ldata0 = valignb(data70, dataF8, align); + dataF8 = memd(ptr_in++#8); + kernel1 = cmp.gtu(kernel, #1); +}:endloop0 +.Lepilog: +{ + noepilog = cmp.eq(epilog,#0); + epilogdws = lsr(epilog, #3); + kernel = and(epilog, #7); +} +{ + if(noepilog) jumpr r31; + if(noepilog) ptr_out = sub(ptr_out, len); + p3 = cmp.eq(epilogdws, #0); + shift2 = asl(epilog, #3); +} +{ + shiftb = and(shift2, #32); + ifword = tstbit(epilog,#2); + if(p3) jump .Lepilog60; + if(!p3) epilog = add(epilog, #-16); +} +{ + loop0(.Ldword_loop_epilog, epilogdws); + /* stop criteria is lsbs unless = 0 then its 8 */ + p3 = cmp.eq(kernel, #0); + if(p3.new) kernel= #8; + p1 = cmp.gt(over, #0); +} + /* if not aligned to end of buffer execute 1 more iteration */ + if(p1) kernel= #0; +.Ldword_loop_epilog: +{ + memd(ptr_out++#8) = ldata0; + ldata0 = valignb(dataF8, data70, align); + p3 = cmp.gt(epilog, kernel); +} +{ + data70 = dataF8; + if(p3) dataF8 = memd(ptr_in++#8); + epilog = add(epilog, #-8); +}:endloop0 +/* copy last 7 bytes */ +.Lepilog60: +{ + if(ifword) memw(ptr_out++#4) = data0; + ldata0 = lsr(ldata0, shiftb); + ifhword = tstbit(epilog,#1); + shiftb = and(shift2, #16); +} +{ + if(ifhword) memh(ptr_out++#2) = data0; + ldata0 = lsr(ldata0, shiftb); + ifbyte = tstbit(epilog,#0); + if(ifbyte.new) len = add(len, #-1); +} +{ + if(ifbyte) memb(ptr_out) = data0; + ptr_out = sub(ptr_out, len); /* return dest pointer */ + jumpr r31; +} +/* do byte copy for small n */ +.Lbytes23orless: +{ + p3 = sp1loop0(.Lbyte_copy, len); + len = add(len, #-1); +} +.Lbyte_copy: +{ + data0 = memb(ptr_in++#1); + if(p3) memb(ptr_out++#1) = data0; +}:endloop0 +{ + memb(ptr_out) = data0; + ptr_out = sub(ptr_out, len); + jumpr r31; +} +/* do dword copies for aligned in, out and length */ +.Ldwordaligned: +{ + p3 = sp1loop0(.Ldword_copy, len8); +} +.Ldword_copy: +{ + if(p3) memd(ptr_out++#8) = ldata0; + ldata0 = memd(ptr_in++#8); +}:endloop0 +{ + memd(ptr_out) = ldata0; + ptr_out = sub(ptr_out, len); + jumpr r31; /* return to function caller */ +} +.Lmemcpy_return: + r21:20 = memd(sp+#16); /* restore r20+r21 */ +{ + r25:24 = memd(sp+#8); /* restore r24+r25 */ + r17:16 = memd(sp+#0); /* restore r16+r17 */ +} + deallocframe; /* restore r31 and incrment stack by 16 */ + jumpr r31 |