word-at-a-time.h: support zero_bytemask() on alpha and tile

Both alpha and tile needed implementations of zero_bytemask. The alpha version is untested.

Chris Metcalf committed 11 years ago

Commit c753bf31 parent 19c22f32 files · +9 −1Browse files

Unified · Split

2 files

@@ -52,4 +52,6 @@ static inline unsigned long find_zero(unsigned long bits) · 51 unmodified lines
52	52	#endif
53	53	}
54	54
	55	+#define zero_bytemask(mask) ((2ul << (find_zero(mask) * 8)) - 1)
	56	+
55	57	#endif /* _ASM_WORD_AT_A_TIME_H */

@@ -6,7 +6,7 @@ · 5 unmodified lines
6	6	struct word_at_a_time { /* unused */ };
7	7	#define WORD_AT_A_TIME_CONSTANTS {}
8	8
9		−/* Generate 0x01 byte values for non-zero bytes using a SIMD instruction. */
	9	+/* Generate 0x01 byte values for zero bytes using a SIMD instruction. */
10	10	static inline unsigned long has_zero(unsigned long val, unsigned long *data,
11	11	const struct word_at_a_time *c)
12	12	{
@@ -33,4 +33,10 @@ static inline long find_zero(unsigned long mask) · 20 unmodified lines
33	33	#endif
34	34	}
35	35
	36	+#ifdef __BIG_ENDIAN
	37	+#define zero_bytemask(mask) (~1ul << (63 - __builtin_clzl(mask)))
	38	+#else
	39	+#define zero_bytemask(mask) ((2ul << __builtin_ctzl(mask)) - 1)
	40	+#endif
	41	+
36	42	#endif /* _ASM_WORD_AT_A_TIME_H */