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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 ·acoshrodataL11<> + 0(SB)/8, $-1.0
DATA ·acoshrodataL11<> + 8(SB)/8, $.41375273347623353626
DATA ·acoshrodataL11<> + 16(SB)/8, $.51487302528619766235E+04
DATA ·acoshrodataL11<> + 24(SB)/8, $-1.67526912689208984375
DATA ·acoshrodataL11<> + 32(SB)/8, $0.181818181818181826E+00
DATA ·acoshrodataL11<> + 40(SB)/8, $-.165289256198351540E-01
DATA ·acoshrodataL11<> + 48(SB)/8, $0.200350613573012186E-02
DATA ·acoshrodataL11<> + 56(SB)/8, $-.273205381970859341E-03
DATA ·acoshrodataL11<> + 64(SB)/8, $0.397389654305194527E-04
DATA ·acoshrodataL11<> + 72(SB)/8, $0.938370938292558173E-06
DATA ·acoshrodataL11<> + 80(SB)/8, $-.602107458843052029E-05
DATA ·acoshrodataL11<> + 88(SB)/8, $0.212881813645679599E-07
DATA ·acoshrodataL11<> + 96(SB)/8, $-.148682720127920854E-06
DATA ·acoshrodataL11<> + 104(SB)/8, $-5.5
DATA ·acoshrodataL11<> + 112(SB)/8, $0x7ff8000000000000 //Nan
GLOBL ·acoshrodataL11<> + 0(SB), RODATA, $120
// Table of log correction terms
DATA ·acoshtab2068<> + 0(SB)/8, $0.585235384085551248E-01
DATA ·acoshtab2068<> + 8(SB)/8, $0.412206153771168640E-01
DATA ·acoshtab2068<> + 16(SB)/8, $0.273839003221648339E-01
DATA ·acoshtab2068<> + 24(SB)/8, $0.166383778368856480E-01
DATA ·acoshtab2068<> + 32(SB)/8, $0.866678223433169637E-02
DATA ·acoshtab2068<> + 40(SB)/8, $0.319831684989627514E-02
DATA ·acoshtab2068<> + 48(SB)/8, $0.0
DATA ·acoshtab2068<> + 56(SB)/8, $-.113006378583725549E-02
DATA ·acoshtab2068<> + 64(SB)/8, $-.367979419636602491E-03
DATA ·acoshtab2068<> + 72(SB)/8, $0.213172484510484979E-02
DATA ·acoshtab2068<> + 80(SB)/8, $0.623271047682013536E-02
DATA ·acoshtab2068<> + 88(SB)/8, $0.118140812789696885E-01
DATA ·acoshtab2068<> + 96(SB)/8, $0.187681358930914206E-01
DATA ·acoshtab2068<> + 104(SB)/8, $0.269985148668178992E-01
DATA ·acoshtab2068<> + 112(SB)/8, $0.364186619761331328E-01
DATA ·acoshtab2068<> + 120(SB)/8, $0.469505379381388441E-01
GLOBL ·acoshtab2068<> + 0(SB), RODATA, $128
// Acosh returns the inverse hyperbolic cosine of the argument.
//
// Special cases are:
// Acosh(+Inf) = +Inf
// Acosh(x) = NaN if x < 1
// Acosh(NaN) = NaN
// The algorithm used is minimax polynomial approximation
// with coefficients determined with a Remez exchange algorithm.
TEXT ·acoshAsm(SB), NOSPLIT, $0-16
FMOVD x+0(FP), F0
MOVD $·acoshrodataL11<>+0(SB), R9
LGDR F0, R1
WORD $0xC0295FEF //iilf %r2,1609564159
BYTE $0xFF
BYTE $0xFF
SRAD $32, R1
CMPW R1, R2
BGT L2
WORD $0xC0293FEF //iilf %r2,1072693247
BYTE $0xFF
BYTE $0xFF
CMPW R1, R2
BGT L10
L3:
WFCEDBS V0, V0, V2
BVS L1
FMOVD 112(R9), F0
L1:
FMOVD F0, ret+8(FP)
RET
L2:
WORD $0xC0297FEF //iilf %r2,2146435071
BYTE $0xFF
BYTE $0xFF
MOVW R1, R6
MOVW R2, R7
CMPBGT R6, R7, L1
FMOVD F0, F8
FMOVD $0, F0
WFADB V0, V8, V0
WORD $0xC0398006 //iilf %r3,2147909631
BYTE $0x7F
BYTE $0xFF
LGDR F0, R5
SRAD $32, R5
MOVH $0x0, R1
SUBW R5, R3
FMOVD $0, F10
RISBGZ $32, $47, $0, R3, R4
RISBGZ $57, $60, $51, R3, R3
BYTE $0x18 //lr %r2,%r4
BYTE $0x24
RISBGN $0, $31, $32, R4, R1
SUBW $0x100000, R2
SRAW $8, R2, R2
ORW $0x45000000, R2
L5:
LDGR R1, F0
FMOVD 104(R9), F2
FMADD F8, F0, F2
FMOVD 96(R9), F4
WFMADB V10, V0, V2, V0
FMOVD 88(R9), F6
FMOVD 80(R9), F2
WFMADB V0, V6, V4, V6
FMOVD 72(R9), F1
WFMDB V0, V0, V4
WFMADB V0, V1, V2, V1
FMOVD 64(R9), F2
WFMADB V6, V4, V1, V6
FMOVD 56(R9), F1
RISBGZ $57, $60, $0, R3, R3
WFMADB V0, V2, V1, V2
FMOVD 48(R9), F1
WFMADB V4, V6, V2, V6
FMOVD 40(R9), F2
WFMADB V0, V1, V2, V1
VLVGF $0, R2, V2
WFMADB V4, V6, V1, V4
LDEBR F2, F2
FMOVD 32(R9), F6
WFMADB V0, V4, V6, V4
FMOVD 24(R9), F1
FMOVD 16(R9), F6
MOVD $·acoshtab2068<>+0(SB), R1
WFMADB V2, V1, V6, V2
FMOVD 0(R3)(R1*1), F3
WFMADB V0, V4, V3, V0
FMOVD 8(R9), F4
FMADD F4, F2, F0
FMOVD F0, ret+8(FP)
RET
L10:
FMOVD F0, F8
FMOVD 0(R9), F0
FMADD F8, F8, F0
LTDBR F0, F0
FSQRT F0, F10
L4:
WFADB V10, V8, V0
WORD $0xC0398006 //iilf %r3,2147909631
BYTE $0x7F
BYTE $0xFF
LGDR F0, R5
SRAD $32, R5
MOVH $0x0, R1
SUBW R5, R3
SRAW $8, R3, R2
RISBGZ $32, $47, $0, R3, R4
ANDW $0xFFFFFF00, R2
RISBGZ $57, $60, $51, R3, R3
ORW $0x45000000, R2
RISBGN $0, $31, $32, R4, R1
BR L5
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