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| 1 // Copyright 2010 The Go Authors. All rights reserved. | 1 // Copyright 2010 The Go Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style | 2 // Use of this source code is governed by a BSD-style |
| 3 // license that can be found in the LICENSE file. | 3 // license that can be found in the LICENSE file. |
| 4 | 4 |
| 5 #include "../../cmd/ld/textflag.h" | 5 #include "textflag.h" |
| 6 | 6 |
| 7 // func Frexp(f float64) (frac float64, exp int) | 7 // func Frexp(f float64) (frac float64, exp int) |
| 8 TEXT ·Frexp(SB),NOSPLIT,$0 | 8 TEXT ·Frexp(SB),NOSPLIT,$0 |
| 9 FMOVD f+0(FP), F0 // F0=f | 9 FMOVD f+0(FP), F0 // F0=f |
| 10 FXAM | 10 FXAM |
| 11 FSTSW AX | 11 FSTSW AX |
| 12 SAHF | 12 SAHF |
| 13 JNP nan_zero_inf | 13 JNP nan_zero_inf |
| 14 JCS nan_zero_inf | 14 JCS nan_zero_inf |
| 15 FXTRACT // F0=f (0<=f<1), F1=e | 15 FXTRACT // F0=f (0<=f<1), F1=e |
| 16 FMULD $(0.5), F0 // F0=f (0.5<=f<1), F1=e | 16 FMULD $(0.5), F0 // F0=f (0.5<=f<1), F1=e |
| 17 FMOVDP F0, frac+8(FP) // F0=e | 17 FMOVDP F0, frac+8(FP) // F0=e |
| 18 FLD1 // F0=1, F1=e | 18 FLD1 // F0=1, F1=e |
| 19 FADDDP F0, F1 // F0=e+1 | 19 FADDDP F0, F1 // F0=e+1 |
| 20 FMOVLP F0, exp+16(FP) // (int=int32) | 20 FMOVLP F0, exp+16(FP) // (int=int32) |
| 21 RET | 21 RET |
| 22 nan_zero_inf: | 22 nan_zero_inf: |
| 23 FMOVDP F0, frac+8(FP) // F0=e | 23 FMOVDP F0, frac+8(FP) // F0=e |
| 24 MOVL $0, exp+16(FP) // exp=0 | 24 MOVL $0, exp+16(FP) // exp=0 |
| 25 RET | 25 RET |
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