/
pow_s390x.s
634 lines (609 loc) · 16.3 KB
/
pow_s390x.s
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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"
#define PosInf 0x7FF0000000000000
#define NaN 0x7FF8000000000001
#define NegInf 0xFFF0000000000000
#define PosOne 0x3FF0000000000000
#define NegOne 0xBFF0000000000000
#define NegZero 0x8000000000000000
// Minimax polynomial approximation
DATA ·powrodataL51<> + 0(SB)/8, $-1.0
DATA ·powrodataL51<> + 8(SB)/8, $1.0
DATA ·powrodataL51<> + 16(SB)/8, $0.24022650695910110361E+00
DATA ·powrodataL51<> + 24(SB)/8, $0.69314718055994686185E+00
DATA ·powrodataL51<> + 32(SB)/8, $0.96181291057109484809E-02
DATA ·powrodataL51<> + 40(SB)/8, $0.15403814778342868389E-03
DATA ·powrodataL51<> + 48(SB)/8, $0.55504108652095235601E-01
DATA ·powrodataL51<> + 56(SB)/8, $0.13333818813168698658E-02
DATA ·powrodataL51<> + 64(SB)/8, $0.68205322933914439200E-12
DATA ·powrodataL51<> + 72(SB)/8, $-.18466496523378731640E-01
DATA ·powrodataL51<> + 80(SB)/8, $0.19697596291603973706E-02
DATA ·powrodataL51<> + 88(SB)/8, $0.23083120654155209200E+00
DATA ·powrodataL51<> + 96(SB)/8, $0.55324356012093416771E-06
DATA ·powrodataL51<> + 104(SB)/8, $-.40340677224649339048E-05
DATA ·powrodataL51<> + 112(SB)/8, $0.30255507904062541562E-04
DATA ·powrodataL51<> + 120(SB)/8, $-.77453979912413008787E-07
DATA ·powrodataL51<> + 128(SB)/8, $-.23637115549923464737E-03
DATA ·powrodataL51<> + 136(SB)/8, $0.11016119077267717198E-07
DATA ·powrodataL51<> + 144(SB)/8, $0.22608272174486123035E-09
DATA ·powrodataL51<> + 152(SB)/8, $-.15895808101370190382E-08
DATA ·powrodataL51<> + 160(SB)/8, $0x4540190000000000
GLOBL ·powrodataL51<> + 0(SB), RODATA, $168
// Constants
DATA ·pow_x001a<> + 0(SB)/8, $0x1a000000000000
GLOBL ·pow_x001a<> + 0(SB), RODATA, $8
DATA ·pow_xinf<> + 0(SB)/8, $0x7ff0000000000000 //+Inf
GLOBL ·pow_xinf<> + 0(SB), RODATA, $8
DATA ·pow_xnan<> + 0(SB)/8, $0x7ff8000000000000 //NaN
GLOBL ·pow_xnan<> + 0(SB), RODATA, $8
DATA ·pow_x434<> + 0(SB)/8, $0x4340000000000000
GLOBL ·pow_x434<> + 0(SB), RODATA, $8
DATA ·pow_x433<> + 0(SB)/8, $0x4330000000000000
GLOBL ·pow_x433<> + 0(SB), RODATA, $8
DATA ·pow_x43f<> + 0(SB)/8, $0x43f0000000000000
GLOBL ·pow_x43f<> + 0(SB), RODATA, $8
DATA ·pow_xadd<> + 0(SB)/8, $0xc2f0000100003fef
GLOBL ·pow_xadd<> + 0(SB), RODATA, $8
DATA ·pow_xa<> + 0(SB)/8, $0x4019000000000000
GLOBL ·pow_xa<> + 0(SB), RODATA, $8
// Scale correction tables
DATA powiadd<> + 0(SB)/8, $0xf000000000000000
DATA powiadd<> + 8(SB)/8, $0x1000000000000000
GLOBL powiadd<> + 0(SB), RODATA, $16
DATA powxscale<> + 0(SB)/8, $0x4ff0000000000000
DATA powxscale<> + 8(SB)/8, $0x2ff0000000000000
GLOBL powxscale<> + 0(SB), RODATA, $16
// Fractional powers of 2 table
DATA ·powtexp<> + 0(SB)/8, $0.442737824274138381E-01
DATA ·powtexp<> + 8(SB)/8, $0.263602189790660309E-01
DATA ·powtexp<> + 16(SB)/8, $0.122565642281703586E-01
DATA ·powtexp<> + 24(SB)/8, $0.143757052860721398E-02
DATA ·powtexp<> + 32(SB)/8, $-.651375034121276075E-02
DATA ·powtexp<> + 40(SB)/8, $-.119317678849450159E-01
DATA ·powtexp<> + 48(SB)/8, $-.150868749549871069E-01
DATA ·powtexp<> + 56(SB)/8, $-.161992609578469234E-01
DATA ·powtexp<> + 64(SB)/8, $-.154492360403337917E-01
DATA ·powtexp<> + 72(SB)/8, $-.129850717389178721E-01
DATA ·powtexp<> + 80(SB)/8, $-.892902649276657891E-02
DATA ·powtexp<> + 88(SB)/8, $-.338202636596794887E-02
DATA ·powtexp<> + 96(SB)/8, $0.357266307045684762E-02
DATA ·powtexp<> + 104(SB)/8, $0.118665304327406698E-01
DATA ·powtexp<> + 112(SB)/8, $0.214434994118118914E-01
DATA ·powtexp<> + 120(SB)/8, $0.322580645161290314E-01
GLOBL ·powtexp<> + 0(SB), RODATA, $128
// Log multiplier tables
DATA ·powtl<> + 0(SB)/8, $0xbdf9723a80db6a05
DATA ·powtl<> + 8(SB)/8, $0x3e0cfe4a0babe862
DATA ·powtl<> + 16(SB)/8, $0xbe163b42dd33dada
DATA ·powtl<> + 24(SB)/8, $0xbe0cdf9de2a8429c
DATA ·powtl<> + 32(SB)/8, $0xbde9723a80db6a05
DATA ·powtl<> + 40(SB)/8, $0xbdb37fcae081745e
DATA ·powtl<> + 48(SB)/8, $0xbdd8b2f901ac662c
DATA ·powtl<> + 56(SB)/8, $0xbde867dc68c36cc9
DATA ·powtl<> + 64(SB)/8, $0xbdd23e36b47256b7
DATA ·powtl<> + 72(SB)/8, $0xbde4c9b89fcc7933
DATA ·powtl<> + 80(SB)/8, $0xbdd16905cad7cf66
DATA ·powtl<> + 88(SB)/8, $0x3ddb417414aa5529
DATA ·powtl<> + 96(SB)/8, $0xbdce046f2889983c
DATA ·powtl<> + 104(SB)/8, $0x3dc2c3865d072897
DATA ·powtl<> + 112(SB)/8, $0x8000000000000000
DATA ·powtl<> + 120(SB)/8, $0x3dc1ca48817f8afe
DATA ·powtl<> + 128(SB)/8, $0xbdd703518a88bfb7
DATA ·powtl<> + 136(SB)/8, $0x3dc64afcc46942ce
DATA ·powtl<> + 144(SB)/8, $0xbd9d79191389891a
DATA ·powtl<> + 152(SB)/8, $0x3ddd563044da4fa0
DATA ·powtl<> + 160(SB)/8, $0x3e0f42b5e5f8f4b6
DATA ·powtl<> + 168(SB)/8, $0x3e0dfa2c2cbf6ead
DATA ·powtl<> + 176(SB)/8, $0x3e14e25e91661293
DATA ·powtl<> + 184(SB)/8, $0x3e0aac461509e20c
GLOBL ·powtl<> + 0(SB), RODATA, $192
DATA ·powtm<> + 0(SB)/8, $0x3da69e13
DATA ·powtm<> + 8(SB)/8, $0x100003d66fcb6
DATA ·powtm<> + 16(SB)/8, $0x200003d1538df
DATA ·powtm<> + 24(SB)/8, $0x300003cab729e
DATA ·powtm<> + 32(SB)/8, $0x400003c1a784c
DATA ·powtm<> + 40(SB)/8, $0x500003ac9b074
DATA ·powtm<> + 48(SB)/8, $0x60000bb498d22
DATA ·powtm<> + 56(SB)/8, $0x68000bb8b29a2
DATA ·powtm<> + 64(SB)/8, $0x70000bb9a32d4
DATA ·powtm<> + 72(SB)/8, $0x74000bb9946bb
DATA ·powtm<> + 80(SB)/8, $0x78000bb92e34b
DATA ·powtm<> + 88(SB)/8, $0x80000bb6c57dc
DATA ·powtm<> + 96(SB)/8, $0x84000bb4020f7
DATA ·powtm<> + 104(SB)/8, $0x8c000ba93832d
DATA ·powtm<> + 112(SB)/8, $0x9000080000000
DATA ·powtm<> + 120(SB)/8, $0x940003aa66c4c
DATA ·powtm<> + 128(SB)/8, $0x980003b2fb12a
DATA ·powtm<> + 136(SB)/8, $0xa00003bc1def6
DATA ·powtm<> + 144(SB)/8, $0xa80003c1eb0eb
DATA ·powtm<> + 152(SB)/8, $0xb00003c64dcec
DATA ·powtm<> + 160(SB)/8, $0xc00003cc49e4e
DATA ·powtm<> + 168(SB)/8, $0xd00003d12f1de
DATA ·powtm<> + 176(SB)/8, $0xe00003d4a9c6f
DATA ·powtm<> + 184(SB)/8, $0xf00003d846c66
GLOBL ·powtm<> + 0(SB), RODATA, $192
// Table of indices into multiplier tables
// Adjusted from asm to remove offset and convert
DATA ·powtabi<> + 0(SB)/8, $0x1010101
DATA ·powtabi<> + 8(SB)/8, $0x101020202020203
DATA ·powtabi<> + 16(SB)/8, $0x303030404040405
DATA ·powtabi<> + 24(SB)/8, $0x505050606060708
DATA ·powtabi<> + 32(SB)/8, $0x90a0b0c0d0e0f10
DATA ·powtabi<> + 40(SB)/8, $0x1011111212121313
DATA ·powtabi<> + 48(SB)/8, $0x1314141414151515
DATA ·powtabi<> + 56(SB)/8, $0x1516161617171717
GLOBL ·powtabi<> + 0(SB), RODATA, $64
// Pow returns x**y, the base-x exponential of y.
//
// Special cases are (in order):
// Pow(x, ±0) = 1 for any x
// Pow(1, y) = 1 for any y
// Pow(x, 1) = x for any x
// Pow(NaN, y) = NaN
// Pow(x, NaN) = NaN
// Pow(±0, y) = ±Inf for y an odd integer < 0
// Pow(±0, -Inf) = +Inf
// Pow(±0, +Inf) = +0
// Pow(±0, y) = +Inf for finite y < 0 and not an odd integer
// Pow(±0, y) = ±0 for y an odd integer > 0
// Pow(±0, y) = +0 for finite y > 0 and not an odd integer
// Pow(-1, ±Inf) = 1
// Pow(x, +Inf) = +Inf for |x| > 1
// Pow(x, -Inf) = +0 for |x| > 1
// Pow(x, +Inf) = +0 for |x| < 1
// Pow(x, -Inf) = +Inf for |x| < 1
// Pow(+Inf, y) = +Inf for y > 0
// Pow(+Inf, y) = +0 for y < 0
// Pow(-Inf, y) = Pow(-0, -y)
// Pow(x, y) = NaN for finite x < 0 and finite non-integer y
TEXT ·powAsm(SB), NOSPLIT, $0-24
// special case
MOVD x+0(FP), R1
MOVD y+8(FP), R2
// special case Pow(1, y) = 1 for any y
MOVD $PosOne, R3
CMPUBEQ R1, R3, xIsOne
// special case Pow(x, 1) = x for any x
MOVD $PosOne, R4
CMPUBEQ R2, R4, yIsOne
// special case Pow(x, NaN) = NaN for any x
MOVD $~(1<<63), R5
AND R2, R5 // y = |y|
MOVD $PosInf, R4
CMPUBLT R4, R5, yIsNan
MOVD $NegInf, R3
CMPUBEQ R1, R3, xIsNegInf
MOVD $NegOne, R3
CMPUBEQ R1, R3, xIsNegOne
MOVD $PosInf, R3
CMPUBEQ R1, R3, xIsPosInf
MOVD $NegZero, R3
CMPUBEQ R1, R3, xIsNegZero
MOVD $PosInf, R4
CMPUBEQ R2, R4, yIsPosInf
MOVD $0x0, R3
CMPUBEQ R1, R3, xIsPosZero
CMPBLT R1, R3, xLtZero
BR Normal
xIsPosInf:
// special case Pow(+Inf, y) = +Inf for y > 0
MOVD $0x0, R4
CMPBGT R2, R4, posInfGeZero
BR Normal
xIsNegInf:
//Pow(-Inf, y) = Pow(-0, -y)
FMOVD y+8(FP), F2
FNEG F2, F2 // y = -y
BR negZeroNegY // call Pow(-0, -y)
xIsNegOne:
// special case Pow(-1, ±Inf) = 1
MOVD $PosInf, R4
CMPUBEQ R2, R4, negOnePosInf
MOVD $NegInf, R4
CMPUBEQ R2, R4, negOneNegInf
BR Normal
xIsPosZero:
// special case Pow(+0, -Inf) = +Inf
MOVD $NegInf, R4
CMPUBEQ R2, R4, zeroNegInf
// special case Pow(+0, y < 0) = +Inf
FMOVD y+8(FP), F2
FMOVD $(0.0), F4
FCMPU F2, F4
BLT posZeroLtZero //y < 0.0
BR Normal
xIsNegZero:
// special case Pow(-0, -Inf) = +Inf
MOVD $NegInf, R4
CMPUBEQ R2, R4, zeroNegInf
FMOVD y+8(FP), F2
negZeroNegY:
// special case Pow(x, ±0) = 1 for any x
FMOVD $(0.0), F4
FCMPU F4, F2
BLT negZeroGtZero // y > 0.0
BEQ yIsZero // y = 0.0
FMOVD $(-0.0), F4
FCMPU F4, F2
BLT negZeroGtZero // y > -0.0
BEQ yIsZero // y = -0.0
// special case Pow(-0, y) = -Inf for y an odd integer < 0
// special case Pow(-0, y) = +Inf for finite y < 0 and not an odd integer
FIDBR $5, F2, F4 //F2 translate to integer F4
FCMPU F2, F4
BNE zeroNotOdd // y is not an (odd) integer and y < 0
FMOVD $(2.0), F4
FDIV F4, F2 // F2 = F2 / 2.0
FIDBR $5, F2, F4 //F2 translate to integer F4
FCMPU F2, F4
BNE negZeroOddInt // y is an odd integer and y < 0
BR zeroNotOdd // y is not an (odd) integer and y < 0
negZeroGtZero:
// special case Pow(-0, y) = -0 for y an odd integer > 0
// special case Pow(±0, y) = +0 for finite y > 0 and not an odd integer
FIDBR $5, F2, F4 //F2 translate to integer F4
FCMPU F2, F4
BNE zeroNotOddGtZero // y is not an (odd) integer and y > 0
FMOVD $(2.0), F4
FDIV F4, F2 // F2 = F2 / 2.0
FIDBR $5, F2, F4 //F2 translate to integer F4
FCMPU F2, F4
BNE negZeroOddIntGtZero // y is an odd integer and y > 0
BR zeroNotOddGtZero // y is not an (odd) integer
xLtZero:
// special case Pow(x, y) = NaN for finite x < 0 and finite non-integer y
FMOVD y+8(FP), F2
FIDBR $5, F2, F4
FCMPU F2, F4
BNE ltZeroInt
BR Normal
yIsPosInf:
// special case Pow(x, +Inf) = +Inf for |x| > 1
FMOVD x+0(FP), F1
FMOVD $(1.0), F3
FCMPU F1, F3
BGT gtOnePosInf
FMOVD $(-1.0), F3
FCMPU F1, F3
BLT ltNegOnePosInf
Normal:
FMOVD x+0(FP), F0
FMOVD y+8(FP), F2
MOVD $·powrodataL51<>+0(SB), R9
LGDR F0, R3
WORD $0xC0298009 //iilf %r2,2148095317
BYTE $0x55
BYTE $0x55
RISBGNZ $32, $63, $32, R3, R1
SUBW R1, R2
RISBGNZ $58, $63, $50, R2, R3
BYTE $0x18 //lr %r5,%r1
BYTE $0x51
MOVD $·powtabi<>+0(SB), R12
WORD $0xE303C000 //llgc %r0,0(%r3,%r12)
BYTE $0x00
BYTE $0x90
SUBW $0x1A0000, R5
SLD $3, R0, R3
MOVD $·powtm<>+0(SB), R4
MOVH $0x0, R8
ANDW $0x7FF00000, R2
ORW R5, R1
WORD $0x5A234000 //a %r2,0(%r3,%r4)
MOVD $0x3FF0000000000000, R5
RISBGZ $40, $63, $56, R2, R3
RISBGN $0, $31, $32, R2, R8
ORW $0x45000000, R3
MOVW R1, R6
CMPBLT R6, $0, L42
FMOVD F0, F4
L2:
VLVGF $0, R3, V1
MOVD $·pow_xa<>+0(SB), R2
WORD $0xED3090A0 //lde %f3,.L52-.L51(%r9)
BYTE $0x00
BYTE $0x24
FMOVD 0(R2), F6
FSUBS F1, F3
LDGR R8, F1
WFMSDB V4, V1, V6, V4
FMOVD 152(R9), F6
WFMDB V4, V4, V7
FMOVD 144(R9), F1
FMOVD 136(R9), F5
WFMADB V4, V1, V6, V1
VLEG $0, 128(R9), V16
FMOVD 120(R9), F6
WFMADB V4, V5, V6, V5
FMOVD 112(R9), F6
WFMADB V1, V7, V5, V1
WFMADB V4, V6, V16, V16
SLD $3, R0, R2
FMOVD 104(R9), F5
WORD $0xED824004 //ldeb %f8,4(%r2,%r4)
BYTE $0x00
BYTE $0x04
LDEBR F3, F3
FMOVD 96(R9), F6
WFMADB V4, V6, V5, V6
FADD F8, F3
WFMADB V7, V6, V16, V6
FMUL F7, F7
FMOVD 88(R9), F5
FMADD F7, F1, F6
WFMADB V4, V5, V3, V16
FMOVD 80(R9), F1
WFSDB V16, V3, V3
MOVD $·powtl<>+0(SB), R3
WFMADB V4, V6, V1, V6
FMADD F5, F4, F3
FMOVD 72(R9), F1
WFMADB V4, V6, V1, V6
WORD $0xED323000 //adb %f3,0(%r2,%r3)
BYTE $0x00
BYTE $0x1A
FMOVD 64(R9), F1
WFMADB V4, V6, V1, V6
MOVD $·pow_xadd<>+0(SB), R2
WFMADB V4, V6, V3, V4
FMOVD 0(R2), F5
WFADB V4, V16, V3
VLEG $0, 56(R9), V20
WFMSDB V2, V3, V5, V3
VLEG $0, 48(R9), V18
WFADB V3, V5, V6
LGDR F3, R2
WFMSDB V2, V16, V6, V16
FMOVD 40(R9), F1
WFMADB V2, V4, V16, V4
FMOVD 32(R9), F7
WFMDB V4, V4, V3
WFMADB V4, V1, V20, V1
WFMADB V4, V7, V18, V7
VLEG $0, 24(R9), V16
WFMADB V1, V3, V7, V1
FMOVD 16(R9), F5
WFMADB V4, V5, V16, V5
RISBGZ $57, $60, $3, R2, R4
WFMADB V3, V1, V5, V1
MOVD $·powtexp<>+0(SB), R3
WORD $0x68343000 //ld %f3,0(%r4,%r3)
FMADD F3, F4, F4
RISBGN $0, $15, $48, R2, R5
WFMADB V4, V1, V3, V4
LGDR F6, R2
LDGR R5, F1
SRAD $48, R2, R2
FMADD F1, F4, F1
RLL $16, R2, R2
ANDW $0x7FFF0000, R2
WORD $0xC22B3F71 //alfi %r2,1064370176
BYTE $0x00
BYTE $0x00
ORW R2, R1, R3
MOVW R3, R6
CMPBLT R6, $0, L43
L1:
FMOVD F1, ret+16(FP)
RET
L43:
LTDBR F0, F0
BLTU L44
FMOVD F0, F3
L7:
MOVD $·pow_xinf<>+0(SB), R3
FMOVD 0(R3), F5
WFCEDBS V3, V5, V7
BVS L8
WFMDB V3, V2, V6
L8:
WFCEDBS V2, V2, V3
BVS L9
LTDBR F2, F2
BEQ L26
MOVW R1, R6
CMPBLT R6, $0, L45
L11:
WORD $0xC0190003 //iilf %r1,262143
BYTE $0xFF
BYTE $0xFF
MOVW R2, R7
MOVW R1, R6
CMPBLE R7, R6, L34
RISBGNZ $32, $63, $32, R5, R1
LGDR F6, R2
MOVD $powiadd<>+0(SB), R3
RISBGZ $60, $60, $4, R2, R2
WORD $0x5A123000 //a %r1,0(%r2,%r3)
RISBGN $0, $31, $32, R1, R5
LDGR R5, F1
FMADD F1, F4, F1
MOVD $powxscale<>+0(SB), R1
WORD $0xED121000 //mdb %f1,0(%r2,%r1)
BYTE $0x00
BYTE $0x1C
BR L1
L42:
LTDBR F0, F0
BLTU L46
FMOVD F0, F4
L3:
MOVD $·pow_x001a<>+0(SB), R2
WORD $0xED402000 //cdb %f4,0(%r2)
BYTE $0x00
BYTE $0x19
BGE L2
BVS L2
MOVD $·pow_x43f<>+0(SB), R2
WORD $0xED402000 //mdb %f4,0(%r2)
BYTE $0x00
BYTE $0x1C
WORD $0xC0298009 //iilf %r2,2148095317
BYTE $0x55
BYTE $0x55
LGDR F4, R3
RISBGNZ $32, $63, $32, R3, R3
SUBW R3, R2, R3
RISBGZ $33, $43, $0, R3, R2
RISBGNZ $58, $63, $50, R3, R3
WORD $0xE303C000 //llgc %r0,0(%r3,%r12)
BYTE $0x00
BYTE $0x90
SLD $3, R0, R3
WORD $0x5A234000 //a %r2,0(%r3,%r4)
BYTE $0x18 //lr %r3,%r2
BYTE $0x32
RISBGN $0, $31, $32, R3, R8
ADDW $0x4000000, R3
BLEU L5
RISBGZ $40, $63, $56, R3, R3
ORW $0x45000000, R3
BR L2
L9:
WFCEDBS V0, V0, V4
BVS L35
FMOVD F2, F1
BR L1
L46:
WORD $0xB3130040 //lcdbr %f4,%f0
BR L3
L44:
WORD $0xB3130030 //lcdbr %f3,%f0
BR L7
L35:
FMOVD F0, F1
BR L1
L26:
FMOVD 8(R9), F1
BR L1
L34:
FMOVD 8(R9), F4
L19:
LTDBR F6, F6
BLEU L47
L18:
WFMDB V4, V5, V1
BR L1
L5:
RISBGZ $33, $50, $63, R3, R3
WORD $0xC23B4000 //alfi %r3,1073741824
BYTE $0x00
BYTE $0x00
RLL $24, R3, R3
ORW $0x45000000, R3
BR L2
L45:
WFCEDBS V0, V0, V4
BVS L35
LTDBR F0, F0
BLEU L48
FMOVD 8(R9), F4
L12:
MOVW R2, R6
CMPBLT R6, $0, L19
FMUL F4, F1
BR L1
L47:
BLT L40
WFCEDBS V0, V0, V2
BVS L49
L16:
MOVD ·pow_xnan<>+0(SB), R1
LDGR R1, F0
WFMDB V4, V0, V1
BR L1
L48:
LGDR F0, R3
RISBGNZ $32, $63, $32, R3, R1
MOVW R1, R6
CMPBEQ R6, $0, L29
LTDBR F2, F2
BLTU L50
FMOVD F2, F4
L14:
MOVD $·pow_x433<>+0(SB), R1
FMOVD 0(R1), F7
WFCHDBS V4, V7, V3
BEQ L15
WFADB V7, V4, V3
FSUB F7, F3
WFCEDBS V4, V3, V3
BEQ L15
LTDBR F0, F0
FMOVD 8(R9), F4
BNE L16
L13:
LTDBR F2, F2
BLT L18
L40:
FMOVD $0, F0
WFMDB V4, V0, V1
BR L1
L49:
WFMDB V0, V4, V1
BR L1
L29:
FMOVD 8(R9), F4
BR L13
L15:
MOVD $·pow_x434<>+0(SB), R1
FMOVD 0(R1), F7
WFCHDBS V4, V7, V3
BEQ L32
WFADB V7, V4, V3
FSUB F7, F3
WFCEDBS V4, V3, V4
BEQ L32
FMOVD 0(R9), F4
L17:
LTDBR F0, F0
BNE L12
BR L13
L32:
FMOVD 8(R9), F4
BR L17
L50:
WORD $0xB3130042 //lcdbr %f4,%f2
BR L14
xIsOne: // Pow(1, y) = 1 for any y
yIsOne: // Pow(x, 1) = x for any x
posInfGeZero: // Pow(+Inf, y) = +Inf for y > 0
MOVD R1, ret+16(FP)
RET
yIsNan: // Pow(NaN, y) = NaN
ltZeroInt: // Pow(x, y) = NaN for finite x < 0 and finite non-integer y
MOVD $NaN, R2
MOVD R2, ret+16(FP)
RET
negOnePosInf: // Pow(-1, ±Inf) = 1
negOneNegInf:
MOVD $PosOne, R3
MOVD R3, ret+16(FP)
RET
negZeroOddInt:
MOVD $NegInf, R3
MOVD R3, ret+16(FP)
RET
zeroNotOdd: // Pow(±0, y) = +Inf for finite y < 0 and not an odd integer
posZeroLtZero: // special case Pow(+0, y < 0) = +Inf
zeroNegInf: // Pow(±0, -Inf) = +Inf
MOVD $PosInf, R3
MOVD R3, ret+16(FP)
RET
gtOnePosInf: //Pow(x, +Inf) = +Inf for |x| > 1
ltNegOnePosInf:
MOVD R2, ret+16(FP)
RET
yIsZero: //Pow(x, ±0) = 1 for any x
MOVD $PosOne, R4
MOVD R4, ret+16(FP)
RET
negZeroOddIntGtZero: // Pow(-0, y) = -0 for y an odd integer > 0
MOVD $NegZero, R3
MOVD R3, ret+16(FP)
RET
zeroNotOddGtZero: // Pow(±0, y) = +0 for finite y > 0 and not an odd integer
MOVD $0, ret+16(FP)
RET