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Diffstat (limited to 'src/math/atan_s390x.s')
| -rw-r--r-- | src/math/atan_s390x.s | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/src/math/atan_s390x.s b/src/math/atan_s390x.s new file mode 100644 index 0000000..3a7e59b --- /dev/null +++ b/src/math/atan_s390x.s @@ -0,0 +1,128 @@ +// 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 coefficients and other constants +DATA ·atanrodataL8<> + 0(SB)/8, $0.199999999999554423E+00 +DATA ·atanrodataL8<> + 8(SB)/8, $0.111111110136634272E+00 +DATA ·atanrodataL8<> + 16(SB)/8, $-.142857142828026806E+00 +DATA ·atanrodataL8<> + 24(SB)/8, $-.333333333333330928E+00 +DATA ·atanrodataL8<> + 32(SB)/8, $0.769228118888682505E-01 +DATA ·atanrodataL8<> + 40(SB)/8, $0.588059263575587687E-01 +DATA ·atanrodataL8<> + 48(SB)/8, $-.666641501287528609E-01 +DATA ·atanrodataL8<> + 56(SB)/8, $-.909090711945939878E-01 +DATA ·atanrodataL8<> + 64(SB)/8, $0.472329433805024762E-01 +DATA ·atanrodataL8<> + 72(SB)/8, $0.366935664549587481E-01 +DATA ·atanrodataL8<> + 80(SB)/8, $-.422172007412067035E-01 +DATA ·atanrodataL8<> + 88(SB)/8, $-.299856214685512712E-01 +DATA ·atanrodataL8<> + 96(SB)/8, $0.220852012160300086E-01 +DATA ·atanrodataL8<> + 104(SB)/8, $0.726338160757602439E-02 +DATA ·atanrodataL8<> + 112(SB)/8, $0.843488472994227321E-03 +DATA ·atanrodataL8<> + 120(SB)/8, $0.134893651284712515E-04 +DATA ·atanrodataL8<> + 128(SB)/8, $-.525380587584426406E-01 +DATA ·atanrodataL8<> + 136(SB)/8, $-.139950258898989925E-01 +DATA ·atanrodataL8<> + 144(SB)/8, $-.291935324869629616E-02 +DATA ·atanrodataL8<> + 152(SB)/8, $-.154797890856877418E-03 +GLOBL ·atanrodataL8<> + 0(SB), RODATA, $160 + +DATA ·atanxpi2h<> + 0(SB)/8, $0x3ff330e4e4fa7b1b +DATA ·atanxpi2h<> + 8(SB)/8, $0xbff330e4e4fa7b1b +DATA ·atanxpi2h<> + 16(SB)/8, $0x400330e4e4fa7b1b +DATA ·atanxpi2h<> + 24(SB)/4, $0xc00330e4e4fa7b1b +GLOBL ·atanxpi2h<> + 0(SB), RODATA, $32 +DATA ·atanxpim<> + 0(SB)/8, $0x3ff4f42b00000000 +GLOBL ·atanxpim<> + 0(SB), RODATA, $8 +DATA ·atanxmone<> + 0(SB)/8, $-1.0 +GLOBL ·atanxmone<> + 0(SB), RODATA, $8 + +// Atan returns the arctangent, in radians, of the argument. +// +// Special cases are: +// Atan(±0) = ±0 +// Atan(±Inf) = ±Pi/2Pi +// The algorithm used is minimax polynomial approximation +// with coefficients determined with a Remez exchange algorithm. + +TEXT ·atanAsm(SB), NOSPLIT, $0-16 + FMOVD x+0(FP), F0 + //special case Atan(±0) = ±0 + FMOVD $(0.0), F1 + FCMPU F0, F1 + BEQ atanIsZero + + MOVD $·atanrodataL8<>+0(SB), R5 + MOVH $0x3FE0, R3 + LGDR F0, R1 + RISBGNZ $32, $63, $32, R1, R1 + RLL $16, R1, R2 + ANDW $0x7FF0, R2 + MOVW R2, R6 + MOVW R3, R7 + CMPUBLE R6, R7, L6 + MOVD $·atanxmone<>+0(SB), R3 + FMOVD 0(R3), F2 + WFDDB V0, V2, V0 + RISBGZ $63, $63, $33, R1, R1 + MOVD $·atanxpi2h<>+0(SB), R3 + MOVWZ R1, R1 + SLD $3, R1, R1 + WORD $0x68813000 //ld %f8,0(%r1,%r3) +L6: + WFMDB V0, V0, V2 + FMOVD 152(R5), F6 + FMOVD 144(R5), F1 + FMOVD 136(R5), F7 + VLEG $0, 128(R5), V16 + FMOVD 120(R5), F4 + FMOVD 112(R5), F5 + WFMADB V2, V4, V6, V4 + WFMADB V2, V5, V1, V5 + WFMDB V2, V2, V6 + FMOVD 104(R5), F3 + FMOVD 96(R5), F1 + WFMADB V2, V3, V7, V3 + MOVH $0x3FE0, R1 + FMOVD 88(R5), F7 + WFMADB V2, V1, V7, V1 + FMOVD 80(R5), F7 + WFMADB V6, V3, V1, V3 + WFMADB V6, V4, V5, V4 + WFMDB V6, V6, V1 + FMOVD 72(R5), F5 + WFMADB V2, V5, V7, V5 + FMOVD 64(R5), F7 + WFMADB V2, V7, V16, V7 + VLEG $0, 56(R5), V16 + WFMADB V6, V5, V7, V5 + WFMADB V1, V4, V3, V4 + FMOVD 48(R5), F7 + FMOVD 40(R5), F3 + WFMADB V2, V3, V7, V3 + FMOVD 32(R5), F7 + WFMADB V2, V7, V16, V7 + VLEG $0, 24(R5), V16 + WFMADB V1, V4, V5, V4 + FMOVD 16(R5), F5 + WFMADB V6, V3, V7, V3 + FMOVD 8(R5), F7 + WFMADB V2, V7, V5, V7 + FMOVD 0(R5), F5 + WFMADB V2, V5, V16, V5 + WFMADB V1, V4, V3, V4 + WFMADB V6, V7, V5, V6 + FMUL F0, F2 + FMADD F4, F1, F6 + FMADD F6, F2, F0 + MOVW R2, R6 + MOVW R1, R7 + CMPUBLE R6, R7, L1 + MOVD $·atanxpim<>+0(SB), R1 + WORD $0xED801000 //madb %f0,%f8,0(%r1) + BYTE $0x00 + BYTE $0x1E +L1: +atanIsZero: + FMOVD F0, ret+8(FP) + RET |