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// 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
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