diff options
Diffstat (limited to 'gcc/toplev.h')
| -rw-r--r-- | gcc/toplev.h | 57 |
1 files changed, 28 insertions, 29 deletions
diff --git a/gcc/toplev.h b/gcc/toplev.h index a212972934d..719cb4cd581 100644 --- a/gcc/toplev.h +++ b/gcc/toplev.h @@ -158,38 +158,37 @@ extern void decode_d_option (const char *); /* Return true iff flags are set as if -ffast-math. */ extern bool fast_math_flags_set_p (void); -/* The following functions accept a wide integer argument. Rather - than having to cast on every function call, we use a macro instead. */ - -#ifndef exact_log2 -#define exact_log2(N) exact_log2_wide ((unsigned HOST_WIDE_INT) (N)) - -#if (__GNUC__ * 1000 + __GNUC_MINOR__) >= 3004 -#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG -#define FL2T__ HOST_WIDE_INT -#define FL2T_CLZ__ __builtin_clzll -#else -#if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG -#define FL2T__ HOST_WIDE_INT -#define FL2T_CLZ__ __builtin_clzl -#else -#define FL2T__ int -#define FL2T_CLZ__ __builtin_clz -#endif -#endif -static inline int floor_log2(FL2T__ n) +/* Return log2, or -1 if not exact. */ +extern int exact_log2 (unsigned HOST_WIDE_INT); + +/* Return floor of log2, with -1 for zero. */ +extern int floor_log2 (unsigned HOST_WIDE_INT); + +/* Inline versions of the above for speed. */ +#if GCC_VERSION >= 3004 +# if HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONG +# define CLZ_HWI __builtin_clzl +# define CTZ_HWI __builtin_ctzl +# elif HOST_BITS_PER_WIDE_INT == HOST_BITS_PER_LONGLONG +# define CLZ_HWI __builtin_clzll +# define CTZ_HWI __builtin_ctzll +# else +# define CLZ_HWI __builtin_clz +# define CTZ_HWI __builtin_ctz +# endif + +extern inline int +floor_log2 (unsigned HOST_WIDE_INT x) { - if (n) - return (sizeof(FL2T__)*8-1) - (int)FL2T_CLZ__(n); - return -1; + return x ? HOST_BITS_PER_WIDE_INT - 1 - (int) CLZ_HWI (x) : -1; } -#else -#define floor_log2(N) floor_log2_wide ((unsigned HOST_WIDE_INT) (N)) -#endif -#endif -extern int exact_log2_wide (unsigned HOST_WIDE_INT); -extern int floor_log2_wide (unsigned HOST_WIDE_INT); +extern inline int +exact_log2 (unsigned HOST_WIDE_INT x) +{ + return x == (x & -x) && x ? (int) CTZ_HWI (x) : -1; +} +#endif /* GCC_VERSION >= 3004 */ /* Functions used to get and set GCC's notion of in what directory compilation was started. */ |