i386.md (allocate_stack_worker_64): Make sure argument operand in rax isn't removed.

2008-05-26  Kai Tietz  <kai.tietz@onevision.com>

	PR/36321
	* config/i386/i386.md (allocate_stack_worker_64): Make sure argument operand in
	rax isn't removed.

2008-05-26  Kai Tietz  <kai.tietz@onevision.com>

	* gcc-c.torture/execute/pr36321.c: New.

From-SVN: r135921

gcc/ChangeLog

+2008-05-26  Kai Tietz  <kai.tietz@onevision.com>
+
+	PR/36321
+	* config/i386/i386.md (allocate_stack_worker_64): Make sure
+	argument operand in rax isn't removed.
+
 2008-05-26  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/36300

gcc/config/i386/i386.md

@@ -19707,7 +19707,7 @@
    (set_attr "length" "5")])
 
 (define_insn "allocate_stack_worker_64"
-  [(set (match_operand:DI 0 "register_operand" "=a")
+  [(set (match_operand:DI 0 "register_operand" "+a")
 	(unspec_volatile:DI [(match_dup 0)] UNSPECV_STACK_PROBE))
    (set (reg:DI SP_REG) (minus:DI (reg:DI SP_REG) (match_dup 0)))
    (clobber (reg:DI R10_REG))

gcc/testsuite/ChangeLog

+2008-05-26  Kai Tietz  <kai.tietz@onevision.com>
+
+	* gcc-c.torture/execute/pr36321.c: New.
+
 2008-05-26  Richard Guenther  <rguenther@suse.de>
 
 	PR middle-end/36300

gcc/testsuite/gcc.c-torture/execute/pr36321.c

+extern void abort (void);
+
+extern __SIZE_TYPE__ strlen (const char *);
+void foo(char *str)
+{
+  int len2 = strlen (str);
+  char *a = (char *) __builtin_alloca (0);
+  char *b = (char *) __builtin_alloca (len2*3);
+
+  if ((int) (a-b) < (len2*3))
+    {
+#ifdef _WIN32
+      abort ();
+#endif
+      return;
+    }
+}
+
+int main(int argc, char **argv)
+{
+  foo (argv[0]);
+  return 0;
+}
+