Thu Apr 13 09:45:01 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu>

* elf/libelf.h (elf_hash): Use XOR instead of ANDN when the bits being cleared are already known to be set. Thanks Ulrich.
git-mirror · Apr 14, 1995 · 6e33fad · 6e33fad
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diff --git a/ChangeLog b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Apr 13 09:45:01 1995  Roland McGrath  <roland@churchy.gnu.ai.mit.edu>
+
+	* elf/libelf.h (elf_hash): Use XOR instead of ANDN when the bits
+ 	being cleared are already known to be set.  Thanks Ulrich.
+
 Wed Apr 12 23:27:22 1995  Roland McGrath  <roland@churchy.gnu.ai.mit.edu>
 
 	* posix/environ.c: Add weak alias `_environ'.

diff --git 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;
 }