mirror of https://go.googlesource.com/go
157 lines
4.7 KiB
ArmAsm
157 lines
4.7 KiB
ArmAsm
// 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
|