Don't convert TImode in debug insn

When converting V1TImode register in debug insn, check if it has been
converted to TImode already.

gcc/

	PR target/71801
	* config/i386/i386.c (timode_scalar_chain::fix_debug_reg_uses):
	Don't convert TImode in debug insn.

gcc/testsuite/

	PR target/71801
	* gcc.target/i386/pr71801.c: New test.

From-SVN: r238211

gcc/ChangeLog

+2016-07-11  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/71801
+	* config/i386/i386.c (timode_scalar_chain::fix_debug_reg_uses):
+	Don't convert TImode in debug insn.
+
 2016-07-11  Bernd Edlinger  <bernd.edlinger@hotmail.de>
 
 	Convert TYPE_ALIGN_OK to a TYPE_LANG_FLAG.

gcc/config/i386/i386.c

@@ -3814,6 +3814,9 @@ timode_scalar_chain::fix_debug_reg_uses (rtx reg)
 	    continue;
 	  gcc_assert (GET_CODE (val) == VAR_LOCATION);
 	  rtx loc = PAT_VAR_LOCATION_LOC (val);
+	  /* It may have been converted to TImode already.  */
+	  if (GET_MODE (loc) == TImode)
+	    continue;
 	  gcc_assert (REG_P (loc)
 		      && GET_MODE (loc) == V1TImode);
 	  /* Convert V1TImode register, which has been updated by a SET

gcc/testsuite/ChangeLog

+2016-07-11  H.J. Lu  <hongjiu.lu@intel.com>
+
+	PR target/71801
+	* gcc.target/i386/pr71801.c: New test.
+
 2016-07-11  Richard Biener  <rguenther@suse.de>
 
 	PR tree-optimization/71816

gcc/testsuite/gcc.target/i386/pr71801.c

+/* { dg-do compile } */
+/* { dg-options "-O2 -g" } */
+
+struct {
+  char uuid[16];
+} c;
+struct {
+  int s_uuid[6];
+} a, b;
+int bar (void);
+static int get_label_uuid(char *p1) {
+  __builtin_memcpy(p1, a.s_uuid, sizeof(a));
+  if (bar())
+    __builtin_memcpy(p1, b.s_uuid, sizeof(b));
+  return 0;
+}
+void uuidcache_addentry(char *p1) { __builtin_memcpy(&c, p1, sizeof(c)); }
+void uuidcache_init() {
+  char d[1];
+  get_label_uuid(d);
+  uuidcache_addentry(d);
+}