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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"
+
+// Constants
+DATA ·log1pxlim<> + 0(SB)/4, $0xfff00000
+GLOBL ·log1pxlim<> + 0(SB), RODATA, $4
+DATA ·log1pxzero<> + 0(SB)/8, $0.0
+GLOBL ·log1pxzero<> + 0(SB), RODATA, $8
+DATA ·log1pxminf<> + 0(SB)/8, $0xfff0000000000000
+GLOBL ·log1pxminf<> + 0(SB), RODATA, $8
+DATA ·log1pxnan<> + 0(SB)/8, $0x7ff8000000000000
+GLOBL ·log1pxnan<> + 0(SB), RODATA, $8
+DATA ·log1pyout<> + 0(SB)/8, $0x40fce621e71da000
+GLOBL ·log1pyout<> + 0(SB), RODATA, $8
+DATA ·log1pxout<> + 0(SB)/8, $0x40f1000000000000
+GLOBL ·log1pxout<> + 0(SB), RODATA, $8
+DATA ·log1pxl2<> + 0(SB)/8, $0xbfda7aecbeba4e46
+GLOBL ·log1pxl2<> + 0(SB), RODATA, $8
+DATA ·log1pxl1<> + 0(SB)/8, $0x3ffacde700000000
+GLOBL ·log1pxl1<> + 0(SB), RODATA, $8
+DATA ·log1pxa<> + 0(SB)/8, $5.5
+GLOBL ·log1pxa<> + 0(SB), RODATA, $8
+DATA ·log1pxmone<> + 0(SB)/8, $-1.0
+GLOBL ·log1pxmone<> + 0(SB), RODATA, $8
+
+// Minimax polynomial approximations
+DATA ·log1pc8<> + 0(SB)/8, $0.212881813645679599E-07
+GLOBL ·log1pc8<> + 0(SB), RODATA, $8
+DATA ·log1pc7<> + 0(SB)/8, $-.148682720127920854E-06
+GLOBL ·log1pc7<> + 0(SB), RODATA, $8
+DATA ·log1pc6<> + 0(SB)/8, $0.938370938292558173E-06
+GLOBL ·log1pc6<> + 0(SB), RODATA, $8
+DATA ·log1pc5<> + 0(SB)/8, $-.602107458843052029E-05
+GLOBL ·log1pc5<> + 0(SB), RODATA, $8
+DATA ·log1pc4<> + 0(SB)/8, $0.397389654305194527E-04
+GLOBL ·log1pc4<> + 0(SB), RODATA, $8
+DATA ·log1pc3<> + 0(SB)/8, $-.273205381970859341E-03
+GLOBL ·log1pc3<> + 0(SB), RODATA, $8
+DATA ·log1pc2<> + 0(SB)/8, $0.200350613573012186E-02
+GLOBL ·log1pc2<> + 0(SB), RODATA, $8
+DATA ·log1pc1<> + 0(SB)/8, $-.165289256198351540E-01
+GLOBL ·log1pc1<> + 0(SB), RODATA, $8
+DATA ·log1pc0<> + 0(SB)/8, $0.181818181818181826E+00
+GLOBL ·log1pc0<> + 0(SB), RODATA, $8
+
+
+// Table of log10 correction terms
+DATA ·log1ptab<> + 0(SB)/8, $0.585235384085551248E-01
+DATA ·log1ptab<> + 8(SB)/8, $0.412206153771168640E-01
+DATA ·log1ptab<> + 16(SB)/8, $0.273839003221648339E-01
+DATA ·log1ptab<> + 24(SB)/8, $0.166383778368856480E-01
+DATA ·log1ptab<> + 32(SB)/8, $0.866678223433169637E-02
+DATA ·log1ptab<> + 40(SB)/8, $0.319831684989627514E-02
+DATA ·log1ptab<> + 48(SB)/8, $-.000000000000000000E+00
+DATA ·log1ptab<> + 56(SB)/8, $-.113006378583725549E-02
+DATA ·log1ptab<> + 64(SB)/8, $-.367979419636602491E-03
+DATA ·log1ptab<> + 72(SB)/8, $0.213172484510484979E-02
+DATA ·log1ptab<> + 80(SB)/8, $0.623271047682013536E-02
+DATA ·log1ptab<> + 88(SB)/8, $0.118140812789696885E-01
+DATA ·log1ptab<> + 96(SB)/8, $0.187681358930914206E-01
+DATA ·log1ptab<> + 104(SB)/8, $0.269985148668178992E-01
+DATA ·log1ptab<> + 112(SB)/8, $0.364186619761331328E-01
+DATA ·log1ptab<> + 120(SB)/8, $0.469505379381388441E-01
+GLOBL ·log1ptab<> + 0(SB), RODATA, $128
+
+// Log1p returns the natural logarithm of 1 plus its argument x.
+// It is more accurate than Log(1 + x) when x is near zero.
+//
+// Special cases are:
+// Log1p(+Inf) = +Inf
+// Log1p(±0) = ±0
+// Log1p(-1) = -Inf
+// Log1p(x < -1) = NaN
+// Log1p(NaN) = NaN
+// The algorithm used is minimax polynomial approximation
+// with coefficients determined with a Remez exchange algorithm.
+
+TEXT ·log1pAsm(SB), NOSPLIT, $0-16
+ FMOVD x+0(FP), F0
+ MOVD $·log1pxmone<>+0(SB), R1
+ MOVD ·log1pxout<>+0(SB), R2
+ FMOVD 0(R1), F3
+ MOVD $·log1pxa<>+0(SB), R1
+ MOVWZ ·log1pxlim<>+0(SB), R0
+ FMOVD 0(R1), F1
+ MOVD $·log1pc8<>+0(SB), R1
+ FMOVD 0(R1), F5
+ MOVD $·log1pc7<>+0(SB), R1
+ VLEG $0, 0(R1), V20
+ MOVD $·log1pc6<>+0(SB), R1
+ WFSDB V0, V3, V4
+ VLEG $0, 0(R1), V18
+ MOVD $·log1pc5<>+0(SB), R1
+ VLEG $0, 0(R1), V16
+ MOVD R2, R5
+ LGDR F4, R3
+ WORD $0xC0190006 //iilf %r1,425983
+ BYTE $0x7F
+ BYTE $0xFF
+ SRAD $32, R3, R3
+ SUBW R3, R1
+ SRW $16, R1, R1
+ BYTE $0x18 //lr %r4,%r1
+ BYTE $0x41
+ RISBGN $0, $15, $48, R4, R2
+ RISBGN $16, $31, $32, R4, R5
+ MOVW R0, R6
+ MOVW R3, R7
+ CMPBGT R6, R7, L8
+ WFCEDBS V4, V4, V6
+ MOVD $·log1pxzero<>+0(SB), R1
+ FMOVD 0(R1), F2
+ BVS LEXITTAGlog1p
+ WORD $0xB3130044 // lcdbr %f4,%f4
+ WFCEDBS V2, V4, V6
+ BEQ L9
+ WFCHDBS V4, V2, V2
+ BEQ LEXITTAGlog1p
+ MOVD $·log1pxnan<>+0(SB), R1
+ FMOVD 0(R1), F0
+ FMOVD F0, ret+8(FP)
+ RET
+
+L8:
+ LDGR R2, F2
+ FSUB F4, F3
+ FMADD F2, F4, F1
+ MOVD $·log1pc4<>+0(SB), R2
+ WORD $0xB3130041 // lcdbr %f4,%f1
+ FMOVD 0(R2), F7
+ FSUB F3, F0
+ MOVD $·log1pc3<>+0(SB), R2
+ FMOVD 0(R2), F3
+ MOVD $·log1pc2<>+0(SB), R2
+ WFMDB V1, V1, V6
+ FMADD F7, F4, F3
+ WFMSDB V0, V2, V1, V0
+ FMOVD 0(R2), F7
+ WFMADB V4, V5, V20, V5
+ MOVD $·log1pc1<>+0(SB), R2
+ FMOVD 0(R2), F2
+ FMADD F7, F4, F2
+ WFMADB V4, V18, V16, V4
+ FMADD F3, F6, F2
+ WFMADB V5, V6, V4, V5
+ FMUL F6, F6
+ MOVD $·log1pc0<>+0(SB), R2
+ WFMADB V6, V5, V2, V6
+ FMOVD 0(R2), F4
+ WFMADB V0, V6, V4, V6
+ RISBGZ $57, $60, $3, R1, R1
+ MOVD $·log1ptab<>+0(SB), R2
+ MOVD $·log1pxl1<>+0(SB), R3
+ WORD $0x68112000 //ld %f1,0(%r1,%r2)
+ FMOVD 0(R3), F2
+ WFMADB V0, V6, V1, V0
+ MOVD $·log1pyout<>+0(SB), R1
+ LDGR R5, F6
+ FMOVD 0(R1), F4
+ WFMSDB V2, V6, V4, V2
+ MOVD $·log1pxl2<>+0(SB), R1
+ FMOVD 0(R1), F4
+ FMADD F4, F2, F0
+ FMOVD F0, ret+8(FP)
+ RET
+
+L9:
+ MOVD $·log1pxminf<>+0(SB), R1
+ FMOVD 0(R1), F0
+ FMOVD F0, ret+8(FP)
+ RET
+
+
+LEXITTAGlog1p:
+ FMOVD F0, ret+8(FP)
+ RET
+