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Viewing changes to src/pkg/math/frexp_386.s

  • Committer: Package Import Robot
  • Author(s): James Page
  • Date: 2013-08-20 14:06:23 UTC
  • mfrom: (14.1.23 saucy-proposed)
  • Revision ID: package-import@ubuntu.com-20130820140623-b414jfxi3m0qkmrq
Tags: 2:1.1.2-2ubuntu1
https://launchpad.net/bugs/1211749
https://launchpad.net/bugs/1202027
* Merge from Debian unstable (LP: #1211749, #1202027). Remaining changes:
  - 016-armhf-elf-header.patch: Use correct ELF header for armhf binaries.
  - d/control,control.cross: Update Breaks/Replaces for Ubuntu
    versions to ensure smooth upgrades, regenerate control file.

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src/pkg/math/frexp_386.s
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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(x float64) (f float64, e int)
 
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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   x+0(FP), F0   // F0=x
 
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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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        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, f+8(FP)   // F0=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, e+16(FP)  // (int=int32)
 
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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, f+8(FP)   // F0=e
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        MOVL    $0, e+16(FP)  // e=0
 
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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