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Diffstat (limited to '')
| -rw-r--r-- | src/math/exp_s390x.s | 177 |
1 files changed, 177 insertions, 0 deletions
diff --git a/src/math/exp_s390x.s b/src/math/exp_s390x.s new file mode 100644 index 0000000..e0ec823 --- /dev/null +++ b/src/math/exp_s390x.s @@ -0,0 +1,177 @@ +// Copyright 2017 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +#include "textflag.h" + +// Minimax polynomial approximation and other constants +DATA ·exprodataL22<> + 0(SB)/8, $800.0E+00 +DATA ·exprodataL22<> + 8(SB)/8, $1.0000000000000022e+00 +DATA ·exprodataL22<> + 16(SB)/8, $0.500000000000004237e+00 +DATA ·exprodataL22<> + 24(SB)/8, $0.166666666630345592e+00 +DATA ·exprodataL22<> + 32(SB)/8, $0.138926439368309441e-02 +DATA ·exprodataL22<> + 40(SB)/8, $0.833349307718286047e-02 +DATA ·exprodataL22<> + 48(SB)/8, $0.416666664838056960e-01 +DATA ·exprodataL22<> + 56(SB)/8, $-.231904681384629956E-16 +DATA ·exprodataL22<> + 64(SB)/8, $-.693147180559945286E+00 +DATA ·exprodataL22<> + 72(SB)/8, $0.144269504088896339E+01 +DATA ·exprodataL22<> + 80(SB)/8, $704.0E+00 +GLOBL ·exprodataL22<> + 0(SB), RODATA, $88 + +DATA ·expxinf<> + 0(SB)/8, $0x7ff0000000000000 +GLOBL ·expxinf<> + 0(SB), RODATA, $8 +DATA ·expx4ff<> + 0(SB)/8, $0x4ff0000000000000 +GLOBL ·expx4ff<> + 0(SB), RODATA, $8 +DATA ·expx2ff<> + 0(SB)/8, $0x2ff0000000000000 +GLOBL ·expx2ff<> + 0(SB), RODATA, $8 +DATA ·expxaddexp<> + 0(SB)/8, $0xc2f0000100003fef +GLOBL ·expxaddexp<> + 0(SB), RODATA, $8 + +// Log multipliers table +DATA ·exptexp<> + 0(SB)/8, $0.442737824274138381E-01 +DATA ·exptexp<> + 8(SB)/8, $0.263602189790660309E-01 +DATA ·exptexp<> + 16(SB)/8, $0.122565642281703586E-01 +DATA ·exptexp<> + 24(SB)/8, $0.143757052860721398E-02 +DATA ·exptexp<> + 32(SB)/8, $-.651375034121276075E-02 +DATA ·exptexp<> + 40(SB)/8, $-.119317678849450159E-01 +DATA ·exptexp<> + 48(SB)/8, $-.150868749549871069E-01 +DATA ·exptexp<> + 56(SB)/8, $-.161992609578469234E-01 +DATA ·exptexp<> + 64(SB)/8, $-.154492360403337917E-01 +DATA ·exptexp<> + 72(SB)/8, $-.129850717389178721E-01 +DATA ·exptexp<> + 80(SB)/8, $-.892902649276657891E-02 +DATA ·exptexp<> + 88(SB)/8, $-.338202636596794887E-02 +DATA ·exptexp<> + 96(SB)/8, $0.357266307045684762E-02 +DATA ·exptexp<> + 104(SB)/8, $0.118665304327406698E-01 +DATA ·exptexp<> + 112(SB)/8, $0.214434994118118914E-01 +DATA ·exptexp<> + 120(SB)/8, $0.322580645161290314E-01 +GLOBL ·exptexp<> + 0(SB), RODATA, $128 + +// Exp returns e**x, the base-e exponential of x. +// +// Special cases are: +// Exp(+Inf) = +Inf +// Exp(NaN) = NaN +// Very large values overflow to 0 or +Inf. +// Very small values underflow to 1. +// The algorithm used is minimax polynomial approximation using a table of +// polynomial coefficients determined with a Remez exchange algorithm. + +TEXT ·expAsm(SB), NOSPLIT, $0-16 + FMOVD x+0(FP), F0 + MOVD $·exprodataL22<>+0(SB), R5 + LTDBR F0, F0 + BLTU L20 + FMOVD F0, F2 +L2: + WORD $0xED205050 //cdb %f2,.L23-.L22(%r5) + BYTE $0x00 + BYTE $0x19 + BGE L16 + BVS L16 + WFCEDBS V2, V2, V2 + BVS LEXITTAGexp + MOVD $·expxaddexp<>+0(SB), R1 + FMOVD 72(R5), F6 + FMOVD 0(R1), F2 + WFMSDB V0, V6, V2, V6 + FMOVD 64(R5), F4 + FADD F6, F2 + FMOVD 56(R5), F1 + FMADD F4, F2, F0 + FMOVD 48(R5), F3 + WFMADB V2, V1, V0, V2 + FMOVD 40(R5), F1 + FMOVD 32(R5), F4 + FMUL F0, F0 + WFMADB V2, V4, V1, V4 + LGDR F6, R1 + FMOVD 24(R5), F1 + WFMADB V2, V3, V1, V3 + FMOVD 16(R5), F1 + WFMADB V0, V4, V3, V4 + FMOVD 8(R5), F3 + WFMADB V2, V1, V3, V1 + RISBGZ $57, $60, $3, R1, R3 + WFMADB V0, V4, V1, V0 + MOVD $·exptexp<>+0(SB), R2 + WORD $0x68432000 //ld %f4,0(%r3,%r2) + FMADD F4, F2, F2 + SLD $48, R1, R2 + WFMADB V2, V0, V4, V2 + LDGR R2, F0 + FMADD F0, F2, F0 + FMOVD F0, ret+8(FP) + RET +L16: + WFCEDBS V2, V2, V4 + BVS LEXITTAGexp + WORD $0xED205000 //cdb %f2,.L33-.L22(%r5) + BYTE $0x00 + BYTE $0x19 + BLT L6 + WFCEDBS V2, V0, V0 + BVS L13 + MOVD $·expxinf<>+0(SB), R1 + FMOVD 0(R1), F0 + FMOVD F0, ret+8(FP) + RET +L20: + WORD $0xB3130020 //lcdbr %f2,%f0 + BR L2 +L6: + MOVD $·expxaddexp<>+0(SB), R1 + FMOVD 72(R5), F3 + FMOVD 0(R1), F4 + WFMSDB V0, V3, V4, V3 + FMOVD 64(R5), F6 + FADD F3, F4 + FMOVD 56(R5), F5 + WFMADB V4, V6, V0, V6 + FMOVD 32(R5), F1 + WFMADB V4, V5, V6, V4 + FMOVD 40(R5), F5 + FMUL F6, F6 + WFMADB V4, V1, V5, V1 + FMOVD 48(R5), F7 + LGDR F3, R1 + FMOVD 24(R5), F5 + WFMADB V4, V7, V5, V7 + FMOVD 16(R5), F5 + WFMADB V6, V1, V7, V1 + FMOVD 8(R5), F7 + WFMADB V4, V5, V7, V5 + RISBGZ $57, $60, $3, R1, R3 + WFMADB V6, V1, V5, V6 + MOVD $·exptexp<>+0(SB), R2 + WFCHDBS V2, V0, V0 + WORD $0x68132000 //ld %f1,0(%r3,%r2) + FMADD F1, F4, F4 + MOVD $0x4086000000000000, R2 + WFMADB V4, V6, V1, V4 + BEQ L21 + ADDW $0xF000, R1 + RISBGN $0, $15, $48, R1, R2 + LDGR R2, F0 + FMADD F0, F4, F0 + MOVD $·expx4ff<>+0(SB), R3 + FMOVD 0(R3), F2 + FMUL F2, F0 + FMOVD F0, ret+8(FP) + RET +L13: + FMOVD $0, F0 + FMOVD F0, ret+8(FP) + RET +L21: + ADDW $0x1000, R1 + RISBGN $0, $15, $48, R1, R2 + LDGR R2, F0 + FMADD F0, F4, F0 + MOVD $·expx2ff<>+0(SB), R3 + FMOVD 0(R3), F2 + FMUL F2, F0 + FMOVD F0, ret+8(FP) + RET +LEXITTAGexp: + FMOVD F0, ret+8(FP) + RET |