1 files changed, 16 insertions, 4 deletions

diff --git a/lib/string.c b/lib/string.c
index dc4a86341f91..3a03782720c8 100644
--- a/lib/string.c
+++ b/lib/string.c
@@ -785,12 +785,24 @@ 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;