[backport from gcc-4.7.3 r191802 <mikpe@it.uu.se>]

gcc/

2012-09-27  Jakub Jelinek  <jakub@redhat.com>

	PR target/54703
	* simplify-rtx.c (simplify_binary_operation_1): Perform
	(x - (x & y)) -> (x & ~y) optimization only for integral
	modes.

gcc/testsuite/

2012-09-27  Jakub Jelinek  <jakub@redhat.com>

	PR target/54703
	* gcc.target/i386/pr54703.c: New test.

--- gcc-4.6.3/gcc/simplify-rtx.c.~1~	2011-12-23 10:16:08.000000000 +0100
+++ gcc-4.6.3/gcc/simplify-rtx.c	2012-09-29 16:46:10.000000000 +0200
@@ -2099,7 +2099,7 @@ simplify_binary_operation_1 (enum rtx_co
 				    neg_const_int (mode, op1));
 
       /* (x - (x & y)) -> (x & ~y) */
-      if (GET_CODE (op1) == AND)
+      if (INTEGRAL_MODE_P (mode) && GET_CODE (op1) == AND)
 	{
 	  if (rtx_equal_p (op0, XEXP (op1, 0)))
 	    {
--- gcc-4.6.3/gcc/testsuite/gcc.target/i386/pr54703.c.~1~	1970-01-01 01:00:00.000000000 +0100
+++ gcc-4.6.3/gcc/testsuite/gcc.target/i386/pr54703.c	2012-09-29 16:46:10.000000000 +0200
@@ -0,0 +1,36 @@
+/* PR target/54703 */
+/* { dg-do run { target sse2_runtime } } */
+/* { dg-options "-O -msse2" } */
+/* { dg-options "-O -msse2 -mavx -mtune=bdver1" { target avx_runtime } } */
+
+extern void abort (void);
+typedef double V __attribute__((vector_size(16)));
+
+union {
+  unsigned long long m[2];
+  V v;
+} u = { { 0xffffffffff000000ULL, 0xffffffffff000000ULL } };
+
+static inline V
+foo (V x)
+{
+  V y = __builtin_ia32_andpd (x, u.v);
+  V z = __builtin_ia32_subpd (x, y);
+  return __builtin_ia32_mulpd (y, z);
+}
+
+void
+test (V *x)
+{
+  V a = { 2.1, 2.1 };
+  *x = foo (foo (a));
+}
+
+int
+main ()
+{
+  test (&u.v);
+  if (u.m[0] != 0x3acbf487f0a30550ULL || u.m[1] != u.m[0])
+    abort ();
+  return 0;
+}