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Diffstat (limited to '')
| -rw-r--r-- | src/math/tan_s390x.s | 110 |
1 files changed, 110 insertions, 0 deletions
diff --git a/src/math/tan_s390x.s b/src/math/tan_s390x.s new file mode 100644 index 0000000..8226760 --- /dev/null +++ b/src/math/tan_s390x.s @@ -0,0 +1,110 @@ +// 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 ·tanrodataL13<> + 0(SB)/8, $0.181017336383229927e-07 +DATA ·tanrodataL13<> + 8(SB)/8, $-.256590857271311164e-03 +DATA ·tanrodataL13<> + 16(SB)/8, $-.464359274328689195e+00 +DATA ·tanrodataL13<> + 24(SB)/8, $1.0 +DATA ·tanrodataL13<> + 32(SB)/8, $-.333333333333333464e+00 +DATA ·tanrodataL13<> + 40(SB)/8, $0.245751217306830032e-01 +DATA ·tanrodataL13<> + 48(SB)/8, $-.245391301343844510e-03 +DATA ·tanrodataL13<> + 56(SB)/8, $0.214530914428992319e-01 +DATA ·tanrodataL13<> + 64(SB)/8, $0.108285667160535624e-31 +DATA ·tanrodataL13<> + 72(SB)/8, $0.612323399573676480e-16 +DATA ·tanrodataL13<> + 80(SB)/8, $0.157079632679489656e+01 +DATA ·tanrodataL13<> + 88(SB)/8, $0.636619772367581341e+00 +GLOBL ·tanrodataL13<> + 0(SB), RODATA, $96 + +// Constants +DATA ·tanxnan<> + 0(SB)/8, $0x7ff8000000000000 +GLOBL ·tanxnan<> + 0(SB), RODATA, $8 +DATA ·tanxlim<> + 0(SB)/8, $0x432921fb54442d19 +GLOBL ·tanxlim<> + 0(SB), RODATA, $8 +DATA ·tanxadd<> + 0(SB)/8, $0xc338000000000000 +GLOBL ·tanxadd<> + 0(SB), RODATA, $8 + +// Tan returns the tangent of the radian argument. +// +// Special cases are: +// Tan(±0) = ±0 +// Tan(±Inf) = NaN +// Tan(NaN) = NaN +// The algorithm used is minimax polynomial approximation using a table of +// polynomial coefficients determined with a Remez exchange algorithm. + +TEXT ·tanAsm(SB), NOSPLIT, $0-16 + FMOVD x+0(FP), F0 + //special case Tan(±0) = ±0 + FMOVD $(0.0), F1 + FCMPU F0, F1 + BEQ atanIsZero + + MOVD $·tanrodataL13<>+0(SB), R5 + LTDBR F0, F0 + BLTU L10 + FMOVD F0, F2 +L2: + MOVD $·tanxlim<>+0(SB), R1 + WORD $0xED201000 //cdb %f2,0(%r1) + BYTE $0x00 + BYTE $0x19 + BGE L11 + BVS L11 + MOVD $·tanxadd<>+0(SB), R1 + FMOVD 88(R5), F6 + FMOVD 0(R1), F4 + WFMSDB V0, V6, V4, V6 + FMOVD 80(R5), F1 + FADD F6, F4 + FMOVD 72(R5), F2 + FMSUB F1, F4, F0 + FMOVD 64(R5), F3 + WFMADB V4, V2, V0, V2 + FMOVD 56(R5), F1 + WFMADB V4, V3, V2, V4 + FMUL F2, F2 + VLEG $0, 48(R5), V18 + LGDR F6, R1 + FMOVD 40(R5), F5 + FMOVD 32(R5), F3 + FMADD F1, F2, F3 + FMOVD 24(R5), F1 + FMOVD 16(R5), F7 + FMOVD 8(R5), F0 + WFMADB V2, V7, V1, V7 + WFMADB V2, V0, V5, V0 + WFMDB V2, V2, V1 + FMOVD 0(R5), F5 + WFLCDB V4, V16 + WFMADB V2, V5, V18, V5 + WFMADB V1, V0, V7, V0 + TMLL R1, $1 + WFMADB V1, V5, V3, V1 + BNE L12 + WFDDB V0, V1, V0 + WFMDB V2, V16, V2 + WFMADB V2, V0, V4, V0 + WORD $0xB3130000 //lcdbr %f0,%f0 + FMOVD F0, ret+8(FP) + RET +L12: + WFMSDB V2, V1, V0, V2 + WFMDB V16, V2, V2 + FDIV F2, F0 + FMOVD F0, ret+8(FP) + RET +L11: + MOVD $·tanxnan<>+0(SB), R1 + FMOVD 0(R1), F0 + FMOVD F0, ret+8(FP) + RET +L10: + WORD $0xB3130020 //lcdbr %f2,%f0 + BR L2 +atanIsZero: + FMOVD F0, ret+8(FP) + RET |