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Diffstat (limited to '')
| -rw-r--r-- | src/math/acos_s390x.s | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/src/math/acos_s390x.s b/src/math/acos_s390x.s new file mode 100644 index 0000000..d2288b8 --- /dev/null +++ b/src/math/acos_s390x.s @@ -0,0 +1,144 @@ +// 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 ·acosrodataL13<> + 0(SB)/8, $0.314159265358979323E+01 //pi +DATA ·acosrodataL13<> + 8(SB)/8, $-0.0 +DATA ·acosrodataL13<> + 16(SB)/8, $0x7ff8000000000000 //Nan +DATA ·acosrodataL13<> + 24(SB)/8, $-1.0 +DATA ·acosrodataL13<> + 32(SB)/8, $1.0 +DATA ·acosrodataL13<> + 40(SB)/8, $0.166666666666651626E+00 +DATA ·acosrodataL13<> + 48(SB)/8, $0.750000000042621169E-01 +DATA ·acosrodataL13<> + 56(SB)/8, $0.446428567178116477E-01 +DATA ·acosrodataL13<> + 64(SB)/8, $0.303819660378071894E-01 +DATA ·acosrodataL13<> + 72(SB)/8, $0.223715011892010405E-01 +DATA ·acosrodataL13<> + 80(SB)/8, $0.173659424522364952E-01 +DATA ·acosrodataL13<> + 88(SB)/8, $0.137810186504372266E-01 +DATA ·acosrodataL13<> + 96(SB)/8, $0.134066870961173521E-01 +DATA ·acosrodataL13<> + 104(SB)/8, $-.412335502831898721E-02 +DATA ·acosrodataL13<> + 112(SB)/8, $0.867383739532082719E-01 +DATA ·acosrodataL13<> + 120(SB)/8, $-.328765950607171649E+00 +DATA ·acosrodataL13<> + 128(SB)/8, $0.110401073869414626E+01 +DATA ·acosrodataL13<> + 136(SB)/8, $-.270694366992537307E+01 +DATA ·acosrodataL13<> + 144(SB)/8, $0.500196500770928669E+01 +DATA ·acosrodataL13<> + 152(SB)/8, $-.665866959108585165E+01 +DATA ·acosrodataL13<> + 160(SB)/8, $-.344895269334086578E+01 +DATA ·acosrodataL13<> + 168(SB)/8, $0.927437952918301659E+00 +DATA ·acosrodataL13<> + 176(SB)/8, $0.610487478874645653E+01 +DATA ·acosrodataL13<> + 184(SB)/8, $0.157079632679489656e+01 +DATA ·acosrodataL13<> + 192(SB)/8, $0.0 +GLOBL ·acosrodataL13<> + 0(SB), RODATA, $200 + +// Acos returns the arccosine, in radians, of the argument. +// +// Special case is: +// Acos(x) = NaN if x < -1 or x > 1 +// The algorithm used is minimax polynomial approximation +// with coefficients determined with a Remez exchange algorithm. + +TEXT ·acosAsm(SB), NOSPLIT, $0-16 + FMOVD x+0(FP), F0 + MOVD $·acosrodataL13<>+0(SB), R9 + LGDR F0, R12 + FMOVD F0, F10 + SRAD $32, R12 + WORD $0xC0293FE6 //iilf %r2,1072079005 + BYTE $0xA0 + BYTE $0x9D + WORD $0xB917001C //llgtr %r1,%r12 + CMPW R1,R2 + BGT L2 + FMOVD 192(R9), F8 + FMADD F0, F0, F8 + FMOVD 184(R9), F1 +L3: + WFMDB V8, V8, V2 + FMOVD 176(R9), F6 + FMOVD 168(R9), F0 + FMOVD 160(R9), F4 + WFMADB V2, V0, V6, V0 + FMOVD 152(R9), F6 + WFMADB V2, V4, V6, V4 + FMOVD 144(R9), F6 + WFMADB V2, V0, V6, V0 + FMOVD 136(R9), F6 + WFMADB V2, V4, V6, V4 + FMOVD 128(R9), F6 + WFMADB V2, V0, V6, V0 + FMOVD 120(R9), F6 + WFMADB V2, V4, V6, V4 + FMOVD 112(R9), F6 + WFMADB V2, V0, V6, V0 + FMOVD 104(R9), F6 + WFMADB V2, V4, V6, V4 + FMOVD 96(R9), F6 + WFMADB V2, V0, V6, V0 + FMOVD 88(R9), F6 + WFMADB V2, V4, V6, V4 + FMOVD 80(R9), F6 + WFMADB V2, V0, V6, V0 + FMOVD 72(R9), F6 + WFMADB V2, V4, V6, V4 + FMOVD 64(R9), F6 + WFMADB V2, V0, V6, V0 + FMOVD 56(R9), F6 + WFMADB V2, V4, V6, V4 + FMOVD 48(R9), F6 + WFMADB V2, V0, V6, V0 + FMOVD 40(R9), F6 + WFMADB V2, V4, V6, V2 + FMOVD 192(R9), F4 + WFMADB V8, V0, V2, V0 + WFMADB V10, V8, V4, V8 + FMADD F0, F8, F10 + WFSDB V10, V1, V10 +L1: + FMOVD F10, ret+8(FP) + RET + +L2: + WORD $0xC0293FEF //iilf %r2,1072693247 + BYTE $0xFF + BYTE $0xFF + CMPW R1, R2 + BLE L12 +L4: + WORD $0xED009020 //cdb %f0,.L34-.L13(%r9) + BYTE $0x00 + BYTE $0x19 + BEQ L8 + WORD $0xED009018 //cdb %f0,.L35-.L13(%r9) + BYTE $0x00 + BYTE $0x19 + BEQ L9 + WFCEDBS V10, V10, V0 + BVS L1 + FMOVD 16(R9), F10 + BR L1 +L12: + FMOVD 24(R9), F0 + FMADD F10, F10, F0 + WORD $0xB3130080 //lcdbr %f8,%f0 + WORD $0xED009008 //cdb %f0,.L37-.L13(%r9) + BYTE $0x00 + BYTE $0x19 + FSQRT F8, F10 +L5: + MOVW R12, R4 + CMPBLE R4, $0, L7 + WORD $0xB31300AA //lcdbr %f10,%f10 + FMOVD $0, F1 + BR L3 +L9: + FMOVD 0(R9), F10 + BR L1 +L8: + FMOVD $0, F0 + FMOVD F0, ret+8(FP) + RET +L7: + FMOVD 0(R9), F1 + BR L3 |