re PR target/57736 (ICE in emit_move_insn with __builtin_ia32_rdtsc)

	PR target/57736
	* config/i386/i386.c (ix86_expand_builtin): If target == NULL
	and mode is VOIDmode, don't create a VOIDmode pseudo to copy result
	into.

	* gcc.target/i386/pr57736.c: New test.

From-SVN: r200555

gcc/ChangeLog

+2013-06-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/57736
+	* config/i386/i386.c (ix86_expand_builtin): If target == NULL
+	and mode is VOIDmode, don't create a VOIDmode pseudo to copy result
+	into.
+
 2013-06-28  Balaji V. Iyer  <balaji.v.iyer@intel.com>
 
 	* builtins.def: Fixed the function type of CILKPLUS_BUILTIN.

gcc/config/i386/i386.c

@@ -32218,7 +32218,13 @@ ix86_expand_builtin (tree exp, rtx target, rtx subtarget ATTRIBUTE_UNUSED,
 	}
 
       if (target == 0)
-	target = gen_reg_rtx (mode);
+	{
+	  /* mode is VOIDmode if __builtin_rd* has been called
+	     without lhs.  */
+	  if (mode == VOIDmode)
+	    return target;
+	  target = gen_reg_rtx (mode);
+	}
 
       if (TARGET_64BIT)
 	{

gcc/testsuite/ChangeLog

+2013-06-28  Jakub Jelinek  <jakub@redhat.com>
+
+	PR target/57736
+	* gcc.target/i386/pr57736.c: New test.
+
 2013-06-28  Balaji V. Iyer  <balaji.v.iyer@intel.com>
 
 	* c-c++-common/cilk-plus/AN/decl-ptr-colon.c (main): Made this testcase

gcc/testsuite/gcc.target/i386/pr57736.c

+/* PR target/57736 */
+/* { dg-do compile } */
+/* { dg-options "-O2" } */
+
+#include <x86intrin.h>
+
+unsigned long long
+f1 (void)
+{
+  return __rdtsc ();
+}
+
+unsigned long long
+f2 (unsigned int *x)
+{
+  return __rdtscp (x);
+}
+
+unsigned long long
+f3 (unsigned int x)
+{
+  return __rdpmc (x);
+}
+
+void
+f4 (void)
+{
+  __rdtsc ();
+}
+
+void
+f5 (unsigned int *x)
+{
+  __rdtscp (x);
+}
+
+void
+f6 (unsigned int x)
+{
+  __rdpmc (x);
+}