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24 lines
661 B
ArmAsm
24 lines
661 B
ArmAsm
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// func Frexp(f float64) (frac float64, exp int)
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TEXT ·Frexp(SB),7,$0
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FMOVD f+0(FP), F0 // F0=f
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FXAM
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FSTSW AX
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SAHF
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JNP nan_zero_inf
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JCS nan_zero_inf
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FXTRACT // F0=f (0<=f<1), F1=e
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FMULD $(0.5), F0 // F0=f (0.5<=f<1), F1=e
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FMOVDP F0, frac+8(FP) // F0=e
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FLD1 // F0=1, F1=e
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FADDDP F0, F1 // F0=e+1
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FMOVLP F0, exp+16(FP) // (int=int32)
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RET
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nan_zero_inf:
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FMOVDP F0, frac+8(FP) // F0=e
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MOVL $0, exp+16(FP) // exp=0
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RET
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