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Diffstat (limited to '')
| -rw-r--r-- | src/math/dim_amd64.s | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/src/math/dim_amd64.s b/src/math/dim_amd64.s new file mode 100644 index 0000000..85c02e6 --- /dev/null +++ b/src/math/dim_amd64.s @@ -0,0 +1,98 @@ +// 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 +#define NegInf 0xFFF0000000000000 + +// func ·Max(x, y float64) float64 +TEXT ·Max(SB),NOSPLIT,$0 + // +Inf special cases + MOVQ $PosInf, AX + MOVQ x+0(FP), R8 + CMPQ AX, R8 + JEQ isPosInf + MOVQ y+8(FP), R9 + CMPQ AX, R9 + JEQ isPosInf + // NaN special cases + MOVQ $~(1<<63), DX // bit mask + MOVQ $PosInf, AX + MOVQ R8, BX + ANDQ DX, BX // x = |x| + CMPQ AX, BX + JLT isMaxNaN + MOVQ R9, CX + ANDQ DX, CX // y = |y| + CMPQ AX, CX + JLT isMaxNaN + // ±0 special cases + ORQ CX, BX + JEQ isMaxZero + + MOVQ R8, X0 + MOVQ R9, X1 + MAXSD X1, X0 + MOVSD X0, ret+16(FP) + RET +isMaxNaN: // return NaN + MOVQ $NaN, AX +isPosInf: // return +Inf + MOVQ AX, ret+16(FP) + RET +isMaxZero: + MOVQ $(1<<63), AX // -0.0 + CMPQ AX, R8 + JEQ +3(PC) + MOVQ R8, ret+16(FP) // return 0 + RET + MOVQ R9, ret+16(FP) // return other 0 + RET + +// func Min(x, y float64) float64 +TEXT ·Min(SB),NOSPLIT,$0 + // -Inf special cases + MOVQ $NegInf, AX + MOVQ x+0(FP), R8 + CMPQ AX, R8 + JEQ isNegInf + MOVQ y+8(FP), R9 + CMPQ AX, R9 + JEQ isNegInf + // NaN special cases + MOVQ $~(1<<63), DX + MOVQ $PosInf, AX + MOVQ R8, BX + ANDQ DX, BX // x = |x| + CMPQ AX, BX + JLT isMinNaN + MOVQ R9, CX + ANDQ DX, CX // y = |y| + CMPQ AX, CX + JLT isMinNaN + // ±0 special cases + ORQ CX, BX + JEQ isMinZero + + MOVQ R8, X0 + MOVQ R9, X1 + MINSD X1, X0 + MOVSD X0, ret+16(FP) + RET +isMinNaN: // return NaN + MOVQ $NaN, AX +isNegInf: // return -Inf + MOVQ AX, ret+16(FP) + RET +isMinZero: + MOVQ $(1<<63), AX // -0.0 + CMPQ AX, R8 + JEQ +3(PC) + MOVQ R9, ret+16(FP) // return other 0 + RET + MOVQ R8, ret+16(FP) // return -0 + RET + |