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[AArch64] Use GCC builtins to count leading/tailing zeros.

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Yufeng Zhang 2014-04-22 17:26:59 +01:00 committed by Marcus Shawcroft
parent 766c4a363d
commit ea6c92f3be
2 changed files with 21 additions and 0 deletions
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ChangeLog
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@ -1,3 +1,8 @@
2014-04-22 Yufeng Zhang <yufeng.zhang@arm.com>
* stdlib/longlong.h (count_leading_zeros, count_trailing_zeros)
(COUNT_LEADING_ZEROS_0): Define for AArch64.
2014-04-22 Siddhesh Poyarekar <siddhesh@redhat.com>
* nptl/sysdeps/unix/sysv/linux/sem_trywait.c: Include atomic.h.

16
stdlib/longlong.h
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@ -122,6 +122,22 @@ extern const UQItype __clz_tab[256] attribute_hidden;
#define __AND_CLOBBER_CC , "cc"
#endif /* __GNUC__ < 2 */
#if defined (__aarch64__)
#if W_TYPE_SIZE == 32
#define count_leading_zeros(COUNT, X) ((COUNT) = __builtin_clz (X))
#define count_trailing_zeros(COUNT, X) ((COUNT) = __builtin_ctz (X))
#define COUNT_LEADING_ZEROS_0 32
#endif /* W_TYPE_SIZE == 32 */
#if W_TYPE_SIZE == 64
#define count_leading_zeros(COUNT, X) ((COUNT) = __builtin_clzll (X))
#define count_trailing_zeros(COUNT, X) ((COUNT) = __builtin_ctzll (X))
#define COUNT_LEADING_ZEROS_0 64
#endif /* W_TYPE_SIZE == 64 */
#endif /* __aarch64__ */
#if defined (__alpha) && W_TYPE_SIZE == 64
#define umul_ppmm(ph, pl, m0, m1) \
do { \