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* soft-fp/op-common.h (__FP_CLZ): Define using __builtin_clz,

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__builtin_clzl and __builtin_clzll.
This commit is contained in:
Roland McGrath 2006-01-06 10:37:39 +00:00
parent d719443fee
commit 0d86378f95
2 changed files with 17 additions and 34 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2005-12-04 Joseph S. Myers <joseph@codesourcery.com>
* soft-fp/op-common.h (__FP_CLZ): Define using __builtin_clz,
__builtin_clzl and __builtin_clzll.
2005-01-05 Mike Frysinger <vapier@gentoo.org>
* include/alloca.h (extend_alloca): Fix typoed name 'extern_alloca'.

46
soft-fp/op-common.h
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@ -1,5 +1,5 @@
/* Software floating-point emulation. Common operations.
Copyright (C) 1997,1998,1999 Free Software Foundation, Inc.
Copyright (C) 1997,1998,1999,2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Richard Henderson (rth@cygnus.com),
Jakub Jelinek (jj@ultra.linux.cz),
@ -725,40 +725,18 @@ do { \
/* Count leading zeros in a word. */
#ifndef __FP_CLZ
#if _FP_W_TYPE_SIZE < 64
/* this is just to shut the compiler up about shifts > word length -- PMM 02/1998 */
#define __FP_CLZ(r, x) \
do { \
_FP_W_TYPE _t = (x); \
r = _FP_W_TYPE_SIZE - 1; \
if (_t > 0xffff) r -= 16; \
if (_t > 0xffff) _t >>= 16; \
if (_t > 0xff) r -= 8; \
if (_t > 0xff) _t >>= 8; \
if (_t & 0xf0) r -= 4; \
if (_t & 0xf0) _t >>= 4; \
if (_t & 0xc) r -= 2; \
if (_t & 0xc) _t >>= 2; \
if (_t & 0x2) r -= 1; \
/* GCC 3.4 and later provide the builtins for us. */
#define __FP_CLZ(r, x) \
do { \
if (sizeof (_FP_W_TYPE) == sizeof (unsigned int)) \
r = __builtin_clz (x); \
else if (sizeof (_FP_W_TYPE) == sizeof (unsigned long)) \
r = __builtin_clzl (x); \
else if (sizeof (_FP_W_TYPE) == sizeof (unsigned long long)) \
r = __builtin_clzll (x); \
else \
abort (); \
} while (0)
#else /* not _FP_W_TYPE_SIZE < 64 */
#define __FP_CLZ(r, x) \
do { \
_FP_W_TYPE _t = (x); \
r = _FP_W_TYPE_SIZE - 1; \
if (_t > 0xffffffff) r -= 32; \
if (_t > 0xffffffff) _t >>= 32; \
if (_t > 0xffff) r -= 16; \
if (_t > 0xffff) _t >>= 16; \
if (_t > 0xff) r -= 8; \
if (_t > 0xff) _t >>= 8; \
if (_t & 0xf0) r -= 4; \
if (_t & 0xf0) _t >>= 4; \
if (_t & 0xc) r -= 2; \
if (_t & 0xc) _t >>= 2; \
if (_t & 0x2) r -= 1; \
} while (0)
#endif /* not _FP_W_TYPE_SIZE < 64 */
#endif /* ndef __FP_CLZ */
#define _FP_DIV_HELP_imm(q, r, n, d) \