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log_s390x.s
// 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 approximations DATA ·logrodataL21<> + 0(SB)/8, $-.499999999999999778E+00 DATA ·logrodataL21<> + 8(SB)/8, $0.333333333333343751E+00 DATA ·logrodataL21<> + 16(SB)/8, $-.250000000001606881E+00 DATA ·logrodataL21<> + 24(SB)/8, $0.199999999971603032E+00 DATA ·logrodataL21<> + 32(SB)/8, $-.166666663114122038E+00 DATA ·logrodataL21<> + 40(SB)/8, $-.125002923782692399E+00 DATA ·logrodataL21<> + 48(SB)/8, $0.111142014580396256E+00 DATA ·logrodataL21<> + 56(SB)/8, $0.759438932618934220E-01 DATA ·logrodataL21<> + 64(SB)/8, $0.142857144267212549E+00 DATA ·logrodataL21<> + 72(SB)/8, $-.993038938793590759E-01 DATA ·logrodataL21<> + 80(SB)/8, $-1.0 GLOBL ·logrodataL21<> + 0(SB), RODATA, $88 // Constants DATA ·logxminf<> + 0(SB)/8, $0xfff0000000000000 GLOBL ·logxminf<> + 0(SB), RODATA, $8 DATA ·logxnan<> + 0(SB)/8, $0x7ff8000000000000 GLOBL ·logxnan<> + 0(SB), RODATA, $8 DATA ·logx43f<> + 0(SB)/8, $0x43f0000000000000 GLOBL ·logx43f<> + 0(SB), RODATA, $8 DATA ·logxl2<> + 0(SB)/8, $0x3fda7aecbeba4e46 GLOBL ·logxl2<> + 0(SB), RODATA, $8 DATA ·logxl1<> + 0(SB)/8, $0x3ffacde700000000 GLOBL ·logxl1<> + 0(SB), RODATA, $8 /* Input transform scale and add constants */ DATA ·logxm<> + 0(SB)/8, $0x3fc77604e63c84b1 DATA ·logxm<> + 8(SB)/8, $0x40fb39456ab53250 DATA ·logxm<> + 16(SB)/8, $0x3fc9ee358b945f3f DATA ·logxm<> + 24(SB)/8, $0x40fb39418bf3b137 DATA ·logxm<> + 32(SB)/8, $0x3fccfb2e1304f4b6 DATA ·logxm<> + 40(SB)/8, $0x40fb393d3eda3022 DATA ·logxm<> + 48(SB)/8, $0x3fd0000000000000 DATA ·logxm<> + 56(SB)/8, $0x40fb393969e70000 DATA ·logxm<> + 64(SB)/8, $0x3fd11117aafbfe04 DATA ·logxm<> + 72(SB)/8, $0x40fb3936eaefafcf DATA ·logxm<> + 80(SB)/8, $0x3fd2492af5e658b2 DATA ·logxm<> + 88(SB)/8, $0x40fb39343ff01715 DATA ·logxm<> + 96(SB)/8, $0x3fd3b50c622a43dd DATA ·logxm<> + 104(SB)/8, $0x40fb39315adae2f3 DATA ·logxm<> + 112(SB)/8, $0x3fd56bbeea918777 DATA ·logxm<> + 120(SB)/8, $0x40fb392e21698552 GLOBL ·logxm<> + 0(SB), RODATA, $128 // Log returns the natural 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 using a table of // polynomial coefficients determined with a Remez exchange algorithm. TEXT ·logAsm(SB), NOSPLIT, $0-16 FMOVD x+0(FP), F0 MOVD $·logrodataL21<>+0(SB), R9 MOVH $0x8006, R4 LGDR F0, R1 MOVD $0x3FF0000000000000, R6 SRAD $48, R1, R1 MOVD $0x40F03E8000000000, R8 SUBW R1, R4 RISBGZ $32, $59, $0, R4, R2 RISBGN $0, $15, $48, R2, R6 RISBGN $16, $31, $32, R2, R8 MOVW R1, R7 CMPBGT R7, $22, L17 LTDBR F0, F0 MOVD $·logx43f<>+0(SB), R1 FMOVD 0(R1), F2 BLEU L3 MOVH $0x8005, R12 MOVH $0x8405, R0 BR L15 L7: LTDBR F0, F0 BLEU L3 L15: FMUL F2, F0 LGDR F0, R1 SRAD $48, R1, R1 SUBW R1, R0, R2 SUBW R1, R12, R3 BYTE $0x18 //lr %r4,%r2 BYTE $0x42 ANDW $0xFFFFFFF0, R3 ANDW $0xFFFFFFF0, R2 BYTE $0x18 //lr %r5,%r1 BYTE $0x51 MOVW R1, R7 CMPBLE R7, $22, L7 RISBGN $0, $15, $48, R3, R6 RISBGN $16, $31, $32, R2, R8 L2: MOVH R5, R5 MOVH $0x7FEF, R1 CMPW R5, R1 BGT L1 LDGR R6, F2 FMUL F2, F0 RISBGZ $57, $59, $3, R4, R4 FMOVD 80(R9), F2 MOVD $·logxm<>+0(SB), R7 ADD R7, R4 FMOVD 72(R9), F4 WORD $0xED004000 //madb %f2,%f0,0(%r4) BYTE $0x20 BYTE $0x1E FMOVD 64(R9), F1 FMOVD F2, F0 FMOVD 56(R9), F2 WFMADB V0, V2, V4, V2 WFMDB V0, V0, V6 FMOVD 48(R9), F4 WFMADB V0, V2, V4, V2 FMOVD 40(R9), F4 WFMADB V2, V6, V1, V2 FMOVD 32(R9), F1 WFMADB V6, V4, V1, V4 FMOVD 24(R9), F1 WFMADB V6, V2, V1, V2 FMOVD 16(R9), F1 WFMADB V6, V4, V1, V4 MOVD $·logxl1<>+0(SB), R1 FMOVD 8(R9), F1 WFMADB V6, V2, V1, V2 FMOVD 0(R9), F1 WFMADB V6, V4, V1, V4 FMOVD 8(R4), F1 WFMADB V0, V2, V4, V2 LDGR R8, F4 WFMADB V6, V2, V0, V2 WORD $0xED401000 //msdb %f1,%f4,0(%r1) BYTE $0x10 BYTE $0x1F MOVD ·logxl2<>+0(SB), R1 WORD $0xB3130001 //lcdbr %f0,%f1 LDGR R1, F4 WFMADB V0, V4, V2, V0 L1: FMOVD F0, ret+8(FP) RET L3: LTDBR F0, F0 BEQ L20 BGE L1 BVS L1 MOVD $·logxnan<>+0(SB), R1 FMOVD 0(R1), F0 BR L1 L20: MOVD $·logxminf<>+0(SB), R1 FMOVD 0(R1), F0 FMOVD F0, ret+8(FP) RET L17: BYTE $0x18 //lr %r5,%r1 BYTE $0x51 BR L2
SIMPAN
BATAL