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// Copyright 2010 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 // func archHypot(p, q float64) float64 TEXT ·archHypot(SB),NOSPLIT,$0 // test bits for special cases MOVQ p+0(FP), BX MOVQ $~(1<<63), AX ANDQ AX, BX // p = |p| MOVQ q+8(FP), CX ANDQ AX, CX // q = |q| MOVQ $PosInf, AX CMPQ AX, BX JLE isInfOrNaN CMPQ AX, CX JLE isInfOrNaN // hypot = max * sqrt(1 + (min/max)**2) MOVQ BX, X0 MOVQ CX, X1 ORQ CX, BX JEQ isZero MOVAPD X0, X2 MAXSD X1, X0 MINSD X2, X1 DIVSD X0, X1 MULSD X1, X1 ADDSD $1.0, X1 SQRTSD X1, X1 MULSD X1, X0 MOVSD X0, ret+16(FP) RET isInfOrNaN: CMPQ AX, BX JEQ isInf CMPQ AX, CX JEQ isInf MOVQ $NaN, AX MOVQ AX, ret+16(FP) // return NaN RET isInf: MOVQ AX, ret+16(FP) // return +Inf RET isZero: MOVQ $0, AX MOVQ AX, ret+16(FP) // return 0 RET