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Optimized signbit{,f} for x86-64.

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Ulrich Drepper 2009-08-25 14:54:12 -07:00
parent d5cb714bb8
commit 7423a3456a
3 changed files with 57 additions and 0 deletions
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ChangeLog
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2009-08-25 Ulrich Drepper <drepper@redhat.com>
* sysdeps/x86_64/fpu/s_signbit.S: New file.
* sysdeps/x86_64/fpu/s_signbitf.S: New file.
* sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c: New file.
* sysdeps/ieee754/dbl-64/wordsize-64/s_trunc.c: New file.

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sysdeps/x86_64/fpu/s_signbit.S Normal file
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/* Return nonzero value if number is negative.
Copyright (C) 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redha.com>, 2009.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
ENTRY(__signbit)
pmovmskb %xmm0, %eax
andl $0x80, %eax
ret
END(__signbit)

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sysdeps/x86_64/fpu/s_signbitf.S Normal file
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/* Return nonzero value if number is negative.
Copyright (C) 2009 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redha.com>, 2009.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
ENTRY(__signbitf)
pmovmskb %xmm0, %eax
andl $0x8, %eax
ret
END(__signbitf)