(elf_hash): Use XOR instead of ANDN when the bits being cleared are already

known to be set.

diff --git a/elf/libelf.h b/elf/libelf.h
index e95dd93..b6575b9 100644 (file)
--- a/elf/libelf.h
+++ b/elf/libelf.h
@@ -220,8 +220,12 @@ elf_hash (__const char *__name)
       __hash = (__hash << 4) + *__name++;
       __hi = __hash & 0xf0000000;
       if (__hi != 0)
-       __hash ^= __hi >> 24;
-      __hash &= ~__hi;
+       {
+         __hash ^= __hi >> 24;
+         /* The ELF ABI says `hash &= ~hi', but this is equivalent
+            in this case and on some machines one insn instead of two.  */
+         __hash ^= __hi;
+       }
     }
   return __hash;
 }