From ea6c92f3be6d59736ee6183a61c538e5d1cc46f8 Mon Sep 17 00:00:00 2001 From: Yufeng Zhang Date: Tue, 22 Apr 2014 17:26:59 +0100 Subject: [AArch64] Use GCC builtins to count leading/tailing zeros. --- stdlib/longlong.h | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) (limited to 'stdlib') diff --git a/stdlib/longlong.h b/stdlib/longlong.h index 10d76cf65e..d45dbe2b73 100644 --- a/stdlib/longlong.h +++ b/stdlib/longlong.h @@ -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 { \ -- cgit v1.2.1