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// Copyright 2016 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. // Based on dim_amd64.s #include "textflag.h" #define PosInf 0x7FF0000000000000 #define NaN 0x7FF8000000000001 #define NegInf 0xFFF0000000000000 // func ·Max(x, y float64) float64 TEXT ·archMax(SB),NOSPLIT,$0 // +Inf special cases MOVD $PosInf, R4 MOVD x+0(FP), R8 CMPUBEQ R4, R8, isPosInf MOVD y+8(FP), R9 CMPUBEQ R4, R9, isPosInf // NaN special cases MOVD $~(1<<63), R5 // bit mask MOVD $PosInf, R4 MOVD R8, R2 AND R5, R2 // x = |x| CMPUBLT R4, R2, isMaxNaN MOVD R9, R3 AND R5, R3 // y = |y| CMPUBLT R4, R3, isMaxNaN // ±0 special cases OR R3, R2 BEQ isMaxZero FMOVD x+0(FP), F1 FMOVD y+8(FP), F2 FCMPU F2, F1 BGT +3(PC) FMOVD F1, ret+16(FP) RET FMOVD F2, ret+16(FP) RET isMaxNaN: // return NaN MOVD $NaN, R4 isPosInf: // return +Inf MOVD R4, ret+16(FP) RET isMaxZero: MOVD $(1<<63), R4 // -0.0 CMPUBEQ R4, R8, +3(PC) MOVD R8, ret+16(FP) // return 0 RET MOVD R9, ret+16(FP) // return other 0 RET // func archMin(x, y float64) float64 TEXT ·archMin(SB),NOSPLIT,$0 // -Inf special cases MOVD $NegInf, R4 MOVD x+0(FP), R8 CMPUBEQ R4, R8, isNegInf MOVD y+8(FP), R9 CMPUBEQ R4, R9, isNegInf // NaN special cases MOVD $~(1<<63), R5 MOVD $PosInf, R4 MOVD R8, R2 AND R5, R2 // x = |x| CMPUBLT R4, R2, isMinNaN MOVD R9, R3 AND R5, R3 // y = |y| CMPUBLT R4, R3, isMinNaN // ±0 special cases OR R3, R2 BEQ isMinZero FMOVD x+0(FP), F1 FMOVD y+8(FP), F2 FCMPU F2, F1 BLT +3(PC) FMOVD F1, ret+16(FP) RET FMOVD F2, ret+16(FP) RET isMinNaN: // return NaN MOVD $NaN, R4 isNegInf: // return -Inf MOVD R4, ret+16(FP) RET isMinZero: MOVD $(1<<63), R4 // -0.0 CMPUBEQ R4, R8, +3(PC) MOVD R9, ret+16(FP) // return other 0 RET MOVD R8, ret+16(FP) // return -0 RET