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Diffstat (limited to 'src/math/log10_s390x.s')
| -rw-r--r-- | src/math/log10_s390x.s | 156 |
1 files changed, 156 insertions, 0 deletions
diff --git a/src/math/log10_s390x.s b/src/math/log10_s390x.s new file mode 100644 index 0000000..3638afe --- /dev/null +++ b/src/math/log10_s390x.s @@ -0,0 +1,156 @@ +// Copyright 2016 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 coefficients and other constants +DATA log10rodataL19<>+0(SB)/8, $0.000000000000000000E+00 +DATA log10rodataL19<>+8(SB)/8, $-1.0 +DATA log10rodataL19<>+16(SB)/8, $0x7FF8000000000000 //+NanN +DATA log10rodataL19<>+24(SB)/8, $.15375570329280596749 +DATA log10rodataL19<>+32(SB)/8, $.60171950900703668594E+04 +DATA log10rodataL19<>+40(SB)/8, $-1.9578460454940795898 +DATA log10rodataL19<>+48(SB)/8, $0.78962633073318517310E-01 +DATA log10rodataL19<>+56(SB)/8, $-.71784211884836937993E-02 +DATA log10rodataL19<>+64(SB)/8, $0.87011165920689940661E-03 +DATA log10rodataL19<>+72(SB)/8, $-.11865158981621437541E-03 +DATA log10rodataL19<>+80(SB)/8, $0.17258413403018680410E-04 +DATA log10rodataL19<>+88(SB)/8, $0.40752932047883484315E-06 +DATA log10rodataL19<>+96(SB)/8, $-.26149194688832680410E-05 +DATA log10rodataL19<>+104(SB)/8, $0.92453396963875026759E-08 +DATA log10rodataL19<>+112(SB)/8, $-.64572084905921579630E-07 +DATA log10rodataL19<>+120(SB)/8, $-5.5 +DATA log10rodataL19<>+128(SB)/8, $18446744073709551616. +GLOBL log10rodataL19<>+0(SB), RODATA, $136 + +// Table of log10 correction terms +DATA log10tab2074<>+0(SB)/8, $0.254164497922885069E-01 +DATA log10tab2074<>+8(SB)/8, $0.179018857989381839E-01 +DATA log10tab2074<>+16(SB)/8, $0.118926768029048674E-01 +DATA log10tab2074<>+24(SB)/8, $0.722595568238080033E-02 +DATA log10tab2074<>+32(SB)/8, $0.376393570022739135E-02 +DATA log10tab2074<>+40(SB)/8, $0.138901135928814326E-02 +DATA log10tab2074<>+48(SB)/8, $0 +DATA log10tab2074<>+56(SB)/8, $-0.490780466387818203E-03 +DATA log10tab2074<>+64(SB)/8, $-0.159811431402137571E-03 +DATA log10tab2074<>+72(SB)/8, $0.925796337165100494E-03 +DATA log10tab2074<>+80(SB)/8, $0.270683176738357035E-02 +DATA log10tab2074<>+88(SB)/8, $0.513079030821304758E-02 +DATA log10tab2074<>+96(SB)/8, $0.815089785397996303E-02 +DATA log10tab2074<>+104(SB)/8, $0.117253060262419215E-01 +DATA log10tab2074<>+112(SB)/8, $0.158164239345343963E-01 +DATA log10tab2074<>+120(SB)/8, $0.203903595489229786E-01 +GLOBL log10tab2074<>+0(SB), RODATA, $128 + +// Log10 returns the decimal logarithm of the argument. +// +// Special cases are: +// Log(+Inf) = +Inf +// Log(0) = -Inf +// Log(x < 0) = NaN +// Log(NaN) = NaN +// The algorithm used is minimax polynomial approximation +// with coefficients determined with a Remez exchange algorithm. + +TEXT ·log10Asm(SB),NOSPLIT,$8-16 + FMOVD x+0(FP), F0 + MOVD $log10rodataL19<>+0(SB), R9 + FMOVD F0, x-8(SP) + WORD $0xC0298006 //iilf %r2,2147909631 + BYTE $0x7F + BYTE $0xFF + WORD $0x5840F008 //l %r4, 8(%r15) + SUBW R4, R2, R3 + RISBGZ $32, $47, $0, R3, R5 + MOVH $0x0, R1 + RISBGN $0, $31, $32, R5, R1 + WORD $0xC0590016 //iilf %r5,1507327 + BYTE $0xFF + BYTE $0xFF + MOVW R4, R10 + MOVW R5, R11 + CMPBLE R10, R11, L2 + WORD $0xC0297FEF //iilf %r2,2146435071 + BYTE $0xFF + BYTE $0xFF + MOVW R4, R10 + MOVW R2, R11 + CMPBLE R10, R11, L16 +L3: +L1: + FMOVD F0, ret+8(FP) + RET + +L2: + LTDBR F0, F0 + BLEU L13 + WORD $0xED009080 //mdb %f0,.L20-.L19(%r9) + BYTE $0x00 + BYTE $0x1C + FMOVD F0, x-8(SP) + WORD $0x5B20F008 //s %r2, 8(%r15) + RISBGZ $57, $60, $51, R2, R3 + ANDW $0xFFFF0000, R2 + RISBGN $0, $31, $32, R2, R1 + ADDW $0x4000000, R2 + BLEU L17 +L8: + SRW $8, R2, R2 + ORW $0x45000000, R2 +L4: + FMOVD log10rodataL19<>+120(SB), F2 + LDGR R1, F4 + WFMADB V4, V0, V2, V0 + FMOVD log10rodataL19<>+112(SB), F4 + FMOVD log10rodataL19<>+104(SB), F6 + WFMADB V0, V6, V4, V6 + FMOVD log10rodataL19<>+96(SB), F4 + FMOVD log10rodataL19<>+88(SB), F1 + WFMADB V0, V1, V4, V1 + WFMDB V0, V0, V4 + FMOVD log10rodataL19<>+80(SB), F2 + WFMADB V6, V4, V1, V6 + FMOVD log10rodataL19<>+72(SB), F1 + WFMADB V0, V2, V1, V2 + FMOVD log10rodataL19<>+64(SB), F1 + RISBGZ $57, $60, $0, R3, R3 + WFMADB V4, V6, V2, V6 + FMOVD log10rodataL19<>+56(SB), F2 + WFMADB V0, V1, V2, V1 + VLVGF $0, R2, V2 + WFMADB V4, V6, V1, V4 + LDEBR F2, F2 + FMOVD log10rodataL19<>+48(SB), F6 + WFMADB V0, V4, V6, V4 + FMOVD log10rodataL19<>+40(SB), F1 + FMOVD log10rodataL19<>+32(SB), F6 + MOVD $log10tab2074<>+0(SB), R1 + WFMADB V2, V1, V6, V2 + WORD $0x68331000 //ld %f3,0(%r3,%r1) + WFMADB V0, V4, V3, V0 + FMOVD log10rodataL19<>+24(SB), F4 + FMADD F4, F2, F0 + FMOVD F0, ret+8(FP) + RET + +L16: + RISBGZ $40, $55, $56, R3, R2 + RISBGZ $57, $60, $51, R3, R3 + ORW $0x45000000, R2 + BR L4 +L13: + BGE L18 //jnl .L18 + BVS L18 + FMOVD log10rodataL19<>+16(SB), F0 + BR L1 +L17: + SRAW $1, R2, R2 + SUBW $0x40000000, R2 + BR L8 +L18: + FMOVD log10rodataL19<>+8(SB), F0 + WORD $0xED009000 //ddb %f0,.L36-.L19(%r9) + BYTE $0x00 + BYTE $0x1D + BR L1 |