re PR debug/45003 (VTA issues with sign/zero extension and debug temporaries)

	PR debug/45003
	* var-tracking.c (reverse_op): Also handle {SIGN,ZERO}_EXTEND of
	a MEM.
	* dwarf2out.c (loc_descriptor): Don't handle SIGN_EXTEND nor
	ZERO_EXTEND here.

	* gcc.dg/guality/pr45003-2.c: New test.
	* gcc.dg/guality/pr45003-3.c: New test.

From-SVN: r162364

gcc/ChangeLog

+2010-07-21  Jakub Jelinek  <jakub@redhat.com>
+
+	PR debug/45003
+	* var-tracking.c (reverse_op): Also handle {SIGN,ZERO}_EXTEND of
+	a MEM.
+	* dwarf2out.c (loc_descriptor): Don't handle SIGN_EXTEND nor
+	ZERO_EXTEND here.
+
 2010-07-20  Richard Henderson  <rth@redhat.com>
 
 	* vxworks.c (vxworks_emutls_var_fields): Pass locus to build_decls.

gcc/dwarf2out.c

@@ -14254,11 +14254,6 @@ loc_descriptor (rtx rtl, enum machine_mode mode,
       loc_result = reg_loc_descriptor (rtl, initialized);
       break;
 
-    case SIGN_EXTEND:
-    case ZERO_EXTEND:
-      loc_result = loc_descriptor (XEXP (rtl, 0), mode, initialized);
-      break;
-
     case MEM:
       loc_result = mem_loc_descriptor (XEXP (rtl, 0), GET_MODE (rtl),
 				       initialized);

gcc/testsuite/ChangeLog

@@ -2,6 +2,10 @@
 
 	* gcc.dg/guality/asm-1.c: New test.
 
+	PR debug/45003
+	* gcc.dg/guality/pr45003-2.c: New test.
+	* gcc.dg/guality/pr45003-3.c: New test.
+
 2010-07-20  Jerry DeLisle  <jvdelisle@gcc.gnu.org>
 
 	PR libfortran/44697

gcc/testsuite/gcc.dg/guality/pr45003-2.c

+/* PR debug/45003 */
+/* { dg-do run { target { x86_64-*-* && lp64 } } } */
+/* { dg-options "-g" } */
+
+int __attribute__((noinline))
+foo (unsigned short *p)
+{
+  int a = *p;
+  asm volatile ("nop" : : "D" ((int) *p));
+  asm volatile ("nop" : : "D" ((int) *p));	/* { dg-final { gdb-test 10 "a" "0x8078" } } */
+  return 0;
+}
+
+int __attribute__((noinline))
+bar (short *p)
+{
+  unsigned int a = *p;
+  asm volatile ("nop" : : "D" ((unsigned int) *p));
+  asm volatile ("nop" : : "D" ((unsigned int) *p));	/* { dg-final { gdb-test 19 "a" "0xffff8078" } } */
+  return 0;
+}
+
+int
+main ()
+{
+  unsigned short us = 0x8078;
+  foo (&us);
+  short s = -32648;
+  bar (&s);
+  return 0;
+}

gcc/testsuite/gcc.dg/guality/pr45003-3.c

+/* PR debug/45003 */
+/* { dg-do run { target { x86_64-*-* && lp64 } } } */
+/* { dg-options "-g" } */
+
+int __attribute__((noinline))
+foo (unsigned short *p)
+{
+  int a = (short) *p;
+  asm volatile ("nop" : : "D" ((int) *p));
+  asm volatile ("nop" : : "D" ((int) *p));	/* { dg-final { gdb-test 10 "a" "-32648" } } */
+  return 0;
+}
+
+int __attribute__((noinline))
+bar (short *p)
+{
+  unsigned int a = (unsigned short) *p;
+  asm volatile ("nop" : : "D" ((unsigned int) *p));
+  asm volatile ("nop" : : "D" ((unsigned int) *p));	/* { dg-final { gdb-test 19 "a" "0x8078" } } */
+  return 0;
+}
+
+int
+main ()
+{
+  unsigned short us = 0x8078;
+  foo (&us);
+  short s = -32648;
+  bar (&s);
+  return 0;
+}

gcc/var-tracking.c

@@ -5187,16 +5187,19 @@ reverse_op (rtx val, const_rtx expr)
     case XOR:
     case NOT:
     case NEG:
+      if (!REG_P (XEXP (src, 0)))
+	return NULL_RTX;
+      break;
     case SIGN_EXTEND:
     case ZERO_EXTEND:
+      if (!REG_P (XEXP (src, 0)) && !MEM_P (XEXP (src, 0)))
+	return NULL_RTX;
       break;
     default:
       return NULL_RTX;
     }
 
-  if (!REG_P (XEXP (src, 0))
-      || !SCALAR_INT_MODE_P (GET_MODE (src))
-      || XEXP (src, 0) == cfa_base_rtx)
+  if (!SCALAR_INT_MODE_P (GET_MODE (src)) || XEXP (src, 0) == cfa_base_rtx)
     return NULL_RTX;
 
   v = cselib_lookup (XEXP (src, 0), GET_MODE (XEXP (src, 0)), 0);