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Diffstat (limited to 'src/math/modf_386.s')
-rw-r--r-- | src/math/modf_386.s | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/src/math/modf_386.s b/src/math/modf_386.s new file mode 100644 index 000000000..3debd3b95 --- /dev/null +++ b/src/math/modf_386.s @@ -0,0 +1,21 @@ +// 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 Modf(f float64) (int float64, frac float64) +TEXT ·Modf(SB),NOSPLIT,$0 + FMOVD f+0(FP), F0 // F0=f + FMOVD F0, F1 // F0=f, F1=f + 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(f), F1=f + FLDCW -2(SP) // load old Control Word + FSUBD F0, F1 // F0=trunc(f), F1=f-trunc(f) + FMOVDP F0, int+8(FP) // F0=f-trunc(f) + FMOVDP F0, frac+16(FP) + RET |