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| author | Kevin Ryde <user42@zip.com.au> | 2002-03-09 23:43:18 +0100 |
|---|---|---|
| committer | Kevin Ryde <user42@zip.com.au> | 2002-03-09 23:43:18 +0100 |
| commit | 9262a18b652b66e71b8fd0fb84f77e3c8588e21c (patch) | |
| tree | 2bab29bf574a076e8f1497a0561d6a042056d826 /longlong.h | |
| parent | 5b6f493adeef191a68771a3a961529cd3d6e1c0a (diff) | |
| download | gmp-9262a18b652b66e71b8fd0fb84f77e3c8588e21c.tar.gz | |
* longlong.h (count_leading_zeros, count_trailing_zeros) [x86_64]: New
macros.
Diffstat (limited to 'longlong.h')
| -rw-r--r-- | longlong.h | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/longlong.h b/longlong.h index e03f44f2d..09d6f58d6 100644 --- a/longlong.h +++ b/longlong.h @@ -701,6 +701,18 @@ extern UWtype __MPN(udiv_qrnnd) _PROTO ((UWtype *, UWtype, UWtype, UWtype)); __asm__ ("divq %4" /* stringification in K&R C */ \ : "=a" (q), "=d" (r) \ : "0" ((UDItype)(n0)), "1" ((UDItype)(n1)), "rm" ((UDItype)(dx))) +#define count_leading_zeros(count, x) \ + do { \ + USItype __cbtmp; \ + ASSERT ((x) != 0); \ + __asm__ ("bsrq %1,%0" : "=r" (__cbtmp) : "rm" ((USItype)(x))); \ + (count) = __cbtmp ^ 63; \ + } while (0) +#define count_trailing_zeros(count, x) \ + do { \ + ASSERT ((x) != 0); \ + __asm__ ("bsfq %1,%0" : "=r" (count) : "rm" ((USItype)(x))); \ + } while (0) #endif /* x86_64 */ #if defined (__i860__) && W_TYPE_SIZE == 32 |