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| author | Roland McGrath <roland@gnu.org> | 2006-01-06 10:37:39 +0000 |
|---|---|---|
| committer | Roland McGrath <roland@gnu.org> | 2006-01-06 10:37:39 +0000 |
| commit | 0d86378f95994072ccc5db9e993b759208beacfa (patch) | |
| tree | 50b4b6a68958d653c0022267a95fbd0bae17a028 /soft-fp | |
| parent | d719443fee5fc0a7547e67d51ade13e222f235be (diff) | |
| download | glibc-0d86378f95994072ccc5db9e993b759208beacfa.tar.gz | |
* soft-fp/op-common.h (__FP_CLZ): Define using __builtin_clz,
__builtin_clzl and __builtin_clzll.
Diffstat (limited to 'soft-fp')
| -rw-r--r-- | soft-fp/op-common.h | 46 |
1 files changed, 12 insertions, 34 deletions
diff --git a/soft-fp/op-common.h b/soft-fp/op-common.h index 3abafa14a8..46162ed3f6 100644 --- a/soft-fp/op-common.h +++ b/soft-fp/op-common.h @@ -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; \ - } 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; \ +/* 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) -#endif /* not _FP_W_TYPE_SIZE < 64 */ #endif /* ndef __FP_CLZ */ #define _FP_DIV_HELP_imm(q, r, n, d) \ |