re PR rtl-optimization/79388 (wrong code with -O -fno-tree-coalesce-vars)

	PR rtl-optimization/79388
	PR rtl-optimization/79450
	* combine.c (distribute_notes): When removing TEM_INSN for which
	corresponding dest has last value recorded, invalidate that last
	value.

	* gcc.c-torture/execute/pr79388.c: New test.
	* gcc.c-torture/execute/pr79450.c: New test.

From-SVN: r245390

gcc/ChangeLog

+2017-02-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/79388
+	PR rtl-optimization/79450
+	* combine.c (distribute_notes): When removing TEM_INSN for which
+	corresponding dest has last value recorded, invalidate that last
+	value.
+
 2016-02-13  Kyrylo Tkachov  <kyrylo.tkachov@arm.com>
 
 	* config/arm/arm.c (arm_print_tune_info): Use ASM_COMMENT_START instead

gcc/combine.c

@@ -14288,6 +14288,11 @@ distribute_notes (rtx notes, rtx_insn *from_insn, rtx_insn *i3, rtx_insn *i2,
 					    NULL_RTX, NULL_RTX, NULL_RTX);
 			  distribute_links (LOG_LINKS (tem_insn));
 
+			  unsigned int regno = REGNO (XEXP (note, 0));
+			  reg_stat_type *rsp = &reg_stat[regno];
+			  if (rsp->last_set == tem_insn)
+			    record_value_for_reg (XEXP (note, 0), NULL, NULL_RTX);
+
 			  SET_INSN_DELETED (tem_insn);
 			  if (tem_insn == i2)
 			    i2 = NULL;

gcc/testsuite/ChangeLog

+2017-02-13  Jakub Jelinek  <jakub@redhat.com>
+
+	PR rtl-optimization/79388
+	PR rtl-optimization/79450
+	* gcc.c-torture/execute/pr79388.c: New test.
+	* gcc.c-torture/execute/pr79450.c: New test.
+
 2017-02-12  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/65542
-	* gfortran.dg/spread_init_expr_2.f90:  New test case.
+	* gfortran.dg/spread_init_expr_2.f90: New test case.
 
 2017-02-11  Jakub Jelinek  <jakub@redhat.com>
 
@@ -812,7 +819,8 @@
 	* gcc.dg/vect/vect-24.c: Remove xfail on ARM targets.
 
 2017-01-25  Carl Love  <cel@us.ibm.com>
-	* gcc.target/powerpc/builtins-3-p8.c:  Add missing tests for the
+
+	* gcc.target/powerpc/builtins-3-p8.c: Add missing tests for the
 	vec_packs built-ins
 
 2017-01-25  Christophe Lyon  <christophe.lyon@linaro.org>
@@ -1012,7 +1020,7 @@
 
 2017-01-23  Thomas Koenig  <tkoenig@netcologne.de>
 
-	* gfortran.dg/integer_exponentiation_7.f90:  New test.
+	* gfortran.dg/integer_exponentiation_7.f90: New test.
 
 2017-01-23  Bernd Schmidt  <bschmidt@redhat.com>
 

gcc/testsuite/gcc.c-torture/execute/pr79388.c

+/* PR rtl-optimization/79388 */
+/* { dg-additional-options "-fno-tree-coalesce-vars" } */
+
+unsigned int a, c;
+
+__attribute__ ((noinline, noclone)) unsigned int
+foo (unsigned int p)
+{
+  p |= 1;
+  p &= 0xfffe;
+  p %= 0xffff;
+  c = p;
+  return a + p;
+}
+
+int
+main (void)
+{
+  int x = foo (6);
+  if (x != 6)
+    __builtin_abort();
+  return 0;
+}

gcc/testsuite/gcc.c-torture/execute/pr79450.c

+/* PR rtl-optimization/79450 */
+
+unsigned int
+foo (unsigned char x, unsigned long long y)
+{
+  do
+    {
+      x &= !y;
+      x %= 24;
+    }
+  while (x < y);
+  return x + y;
+}
+
+int
+main (void)
+{
+  unsigned int x = foo (1, 0);
+  if (x != 1)
+    __builtin_abort ();
+  return 0;
+}