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Optimized lrint and llrint for x86-64

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This commit is contained in:
Ulrich Drepper 2011-09-14 12:58:43 -04:00
parent 48b67d71ec
commit cd20565401
2 changed files with 53 additions and 10 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2011-09-14 Ulrich Drepper <drepper@gmail.com>
* sysdeps/x86_64/fpu/bits/mathinline.h (__MATH_INLINE): Use
__extern_always_inline.
Define lrint{f,} and llrint{f,} for 64-bit and in some situations for
32-bit.
2011-09-14 Andreas Schwab <schwab@redhat.com>
* elf/rtld.c (dl_main): Also relocate in dependency order when

56
sysdeps/x86_64/fpu/bits/mathinline.h
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@ -1,7 +1,6 @@
/* Inline math functions for x86-64.
Copyright (C) 2002, 2003, 2004, 2007, 2009 Free Software Foundation, Inc.
Copyright (C) 2002-2004, 2007, 2009, 2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Andreas Jaeger <aj@suse.de>, 2002.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
@ -24,10 +23,10 @@
#include <bits/wordsize.h>
#ifndef __extern_inline
#ifndef __extern_always_inline
# define __MATH_INLINE __inline
#else
# define __MATH_INLINE __extern_inline
# define __MATH_INLINE __extern_always_inline
#endif
@ -37,26 +36,26 @@
__MATH_INLINE int
__NTH (__signbitf (float __x))
{
#if __WORDSIZE == 32
# if __WORDSIZE == 32
__extension__ union { float __f; int __i; } __u = { __f: __x };
return __u.__i < 0;
#else
# else
int __m;
__asm ("pmovmskb %1, %0" : "=r" (__m) : "x" (__x));
return __m & 0x8;
#endif
# endif
}
__MATH_INLINE int
__NTH (__signbit (double __x))
{
#if __WORDSIZE == 32
# if __WORDSIZE == 32
__extension__ union { double __d; int __i[2]; } __u = { __d: __x };
return __u.__i[1] < 0;
#else
# else
int __m;
__asm ("pmovmskb %1, %0" : "=r" (__m) : "x" (__x));
return __m & 0x80;
#endif
# endif
}
__MATH_INLINE int
__NTH (__signbitl (long double __x))
@ -64,4 +63,41 @@ __NTH (__signbitl (long double __x))
__extension__ union { long double __l; int __i[3]; } __u = { __l: __x };
return (__u.__i[2] & 0x8000) != 0;
}
/* Round to nearest integer. */
# if __WORDSIZE == 64 || defined __SSE_MATH__
__MATH_INLINE long int
__NTH (lrintf (float __x))
{
long int __res;
asm ("cvtss2si %1, %0" : "=r" (__res) : "xm" (__x));
return __res;
}
# endif
# if __WORDSIZE == 64 || defined __SSE2_MATH__
__MATH_INLINE long int
__NTH (lrint (double __x))
{
long int __res;
asm ("cvtsd2si %1, %0" : "=r" (__res) : "xm" (__x));
return __res;
}
# endif
# if __WORDSIZE == 64
__MATH_INLINE long long int
__NTH (llrintf (float __x))
{
long long int __res;
asm ("cvtss2si %1, %0" : "=r" (__res) : "xm" (__x));
return __res;
}
__MATH_INLINE long long int
__NTH (llrint (double __x))
{
long long int __res;
asm ("cvtsd2si %1, %0" : "=r" (__res) : "xm" (__x));
return __res;
}
# endif
#endif