4 files changed, 44 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index f587af8..a6eb15a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2013-04-29  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR target/44578
+	* config/i386/i386.md (*zero_extendsidi2): Add "!" to m->?*y
+	alternative.
+
 2013-04-29  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR target/57097
diff --git a/gcc/config/i386/i386.md b/gcc/config/i386/i386.md
index f6ffc01..d8add68 100644
--- a/gcc/config/i386/i386.md
+++ b/gcc/config/i386/i386.md
@@ -3049,10 +3049,10 @@
 
 (define_insn "*zero_extendsidi2"
   [(set (match_operand:DI 0 "nonimmediate_operand"
-			"=r,?r,?o,r   ,o,?*Ym,?*y,?*Yi,?*x")
+			"=r,?r,?o,r   ,o,?*Ym,?!*y,?*Yi,?*x")
 	(zero_extend:DI
 	 (match_operand:SI 1 "x86_64_zext_operand"
-	        	"0 ,rm,r ,rmWz,0,r   ,m  ,r   ,m")))]
+	        	"0 ,rm,r ,rmWz,0,r   ,m   ,r   ,m")))]
   ""
 {
   switch (get_attr_type (insn))
diff --git a/gcc/testsuite/ChangeLog b/gcc/testsuite/ChangeLog
index 42f141e..56f3ac8 100644
--- a/gcc/testsuite/ChangeLog
+++ b/gcc/testsuite/ChangeLog
@@ -1,3 +1,8 @@
+2013-04-29  Uros Bizjak  <ubizjak@gmail.com>
+
+	PR target/44578
+	* gcc.target/i386/pr44578.c: New test.
+
 2013-04-29  Vladimir Makarov  <vmakarov@redhat.com>
 
 	PR target/57097
diff --git a/gcc/testsuite/gcc.target/i386/pr44578.c b/gcc/testsuite/gcc.target/i386/pr44578.c
new file mode 100644
index 0000000..20f76c3
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr44578.c
@@ -0,0 +1,31 @@
+/* { dg-do run } */
+/* { dg-options "-O2 -mtune=athlon64" } */
+
+extern void abort (void);
+
+long double
+__attribute__((noinline, noclone))
+test (float num)
+{
+  unsigned int i;
+
+  if (num < 0.0)
+    num = 0.0;
+
+  __builtin_memcpy (&i, &num, sizeof(unsigned int));
+
+  return (long double)(unsigned long long) i;
+}
+
+int
+main ()
+{
+  long double x;
+
+  x = test (0.0);
+
+  if (x != 0.0)
+    abort ();
+
+  return 0;
+}