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Diffstat (limited to 'src/math/floor_386.s')
| -rw-r--r-- | src/math/floor_386.s | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/math/floor_386.s b/src/math/floor_386.s new file mode 100644 index 0000000..0960eec --- /dev/null +++ b/src/math/floor_386.s @@ -0,0 +1,46 @@ +// 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" + +// func Ceil(x float64) float64 +TEXT ·Ceil(SB),NOSPLIT,$0 + FMOVD x+0(FP), F0 // F0=x + FSTCW -2(SP) // save old Control Word + MOVW -2(SP), AX + ANDW $0xf3ff, AX + ORW $0x0800, AX // Rounding Control set to +Inf + MOVW AX, -4(SP) // store new Control Word + FLDCW -4(SP) // load new Control Word + FRNDINT // F0=Ceil(x) + FLDCW -2(SP) // load old Control Word + FMOVDP F0, ret+8(FP) + RET + +// func Floor(x float64) float64 +TEXT ·Floor(SB),NOSPLIT,$0 + FMOVD x+0(FP), F0 // F0=x + FSTCW -2(SP) // save old Control Word + MOVW -2(SP), AX + ANDW $0xf3ff, AX + ORW $0x0400, AX // Rounding Control set to -Inf + MOVW AX, -4(SP) // store new Control Word + FLDCW -4(SP) // load new Control Word + FRNDINT // F0=Floor(x) + FLDCW -2(SP) // load old Control Word + FMOVDP F0, ret+8(FP) + RET + +// func Trunc(x float64) float64 +TEXT ·Trunc(SB),NOSPLIT,$0 + FMOVD x+0(FP), F0 // F0=x + FSTCW -2(SP) // save old Control Word + MOVW -2(SP), AX + ORW $0x0c00, AX // Rounding Control set to truncate + MOVW AX, -4(SP) // store new Control Word + FLDCW -4(SP) // load new Control Word + FRNDINT // F0=Trunc(x) + FLDCW -2(SP) // load old Control Word + FMOVDP F0, ret+8(FP) + RET |