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-rw-r--r--lib/string.c20
1 files changed, 16 insertions, 4 deletions
diff --git a/lib/string.c b/lib/string.c
index 26df13e43cc..e5878de4f10 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -788,12 +788,24 @@ void *memchr_inv(const void *start, int c, size_t bytes)
if (bytes <= 16)
return check_bytes8(start, value, bytes);
- value64 = value | value << 8 | value << 16 | value << 24;
- value64 = (value64 & 0xffffffff) | value64 << 32;
- prefix = 8 - ((unsigned long)start) % 8;
+ value64 = value;
+#if defined(ARCH_HAS_FAST_MULTIPLIER) && BITS_PER_LONG == 64
+ value64 *= 0x0101010101010101;
+#elif defined(ARCH_HAS_FAST_MULTIPLIER)
+ value64 *= 0x01010101;
+ value64 |= value64 << 32;
+#else
+ value64 |= value64 << 8;
+ value64 |= value64 << 16;
+ value64 |= value64 << 32;
+#endif
+ prefix = (unsigned long)start % 8;
if (prefix) {
- u8 *r = check_bytes8(start, value, prefix);
+ u8 *r;
+
+ prefix = 8 - prefix;
+ r = check_bytes8(start, value, prefix);
if (r)
return r;
start += prefix;