mirror of
https://github.com/golang/go
synced 2024-10-05 04:31:22 -06:00
24 lines
644 B
ArmAsm
24 lines
644 B
ArmAsm
|
// 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.
|
||
|
|
||
|
// func Frexp(x float64) (f float64, e int)
|
||
|
TEXT ·Frexp(SB),7,$0
|
||
|
FMOVD x+0(FP), F0 // F0=x
|
||
|
FXAM
|
||
|
FSTSW AX
|
||
|
SAHF
|
||
|
JNP nan_zero_inf
|
||
|
JCS nan_zero_inf
|
||
|
FXTRACT // F0=f (0<=f<1), F1=e
|
||
|
FMULD $(0.5), F0 // F0=f (0.5<=f<1), F1=e
|
||
|
FMOVDP F0, f+8(FP) // F0=e
|
||
|
FLD1 // F0=1, F1=e
|
||
|
FADDDP F0, F1 // F0=e+1
|
||
|
FMOVLP F0, e+16(FP) // (int=int32)
|
||
|
RET
|
||
|
nan_zero_inf:
|
||
|
FMOVDP F0, f+8(FP) // F0=e
|
||
|
MOVL $0, e+16(FP) // e=0
|
||
|
RET
|