tree-ssa-forwprop.c (simplify_builtin_call): Do not remove stmt at gsi_p,…

tree-ssa-forwprop.c (simplify_builtin_call): Do not remove stmt at gsi_p, instead replace it with a NOP removed later.

2019-08-16  Richard Biener  <rguenther@suse.de>

	* tree-ssa-forwprop.c (simplify_builtin_call): Do not remove
	stmt at gsi_p, instead replace it with a NOP removed later.
	(pass_forwprop::execute): Fully propagate lattice, DCE stmts
	that became dead because of that.

	fortran/
	* trans-intrinsic.c (gfc_conv_intrinsic_findloc): Initialize
	forward_branch to avoid bogus uninitialized warning.

	* gcc.dg/tree-ssa/forwprop-31.c: Adjust.

From-SVN: r274563

gcc/ChangeLog

+2019-08-16  Richard Biener  <rguenther@suse.de>
+
+	* tree-ssa-forwprop.c (simplify_builtin_call): Do not remove
+	stmt at gsi_p, instead replace it with a NOP removed later.
+	(pass_forwprop::execute): Fully propagate lattice, DCE stmts
+	that became dead because of that.
+
 2019-08-16  Aldy Hernandez  <aldyh@redhat.com>
 
 	* gimple-ssa-evrp-analyze.c (record_ranges_from_phis): Skip PHIs

gcc/fortran/ChangeLog

+2019-08-16  Richard Biener  <rguenther@suse.de>
+
+	* trans-intrinsic.c (gfc_conv_intrinsic_findloc): Initialize
+	forward_branch to avoid bogus uninitialized warning.
+
 2019-08-15  Thomas Koenig  <tkoenig@gcc.gnu.org>
 
 	PR fortran/91443

gcc/fortran/trans-intrinsic.c

@@ -5428,7 +5428,7 @@ gfc_conv_intrinsic_findloc (gfc_se *se, gfc_expr *expr)
   tree type;
   tree tmp;
   tree found;
-  tree forward_branch;
+  tree forward_branch = NULL_TREE;
   tree back_branch;
   gfc_loopinfo loop;
   gfc_ss *arrayss;

gcc/testsuite/ChangeLog

+2019-08-16  Richard Biener  <rguenther@suse.de>
+
+	* gcc.dg/tree-ssa/forwprop-31.c: Adjust.
+
 2019-08-16  Martin Liska  <mliska@suse.cz>
 
 	PR ipa/91447

gcc/testsuite/gcc.dg/tree-ssa/forwprop-31.c

@@ -9,7 +9,6 @@ int foo (int x)
   return w - z; /* becomes 0 */
 }
 
-/* The original y = 0 stmt is also retained.  */
-/* { dg-final { scan-tree-dump-times "= 0;" 2 "forwprop1" } } */
-/* { dg-final { scan-tree-dump-times "-" 0 "forwprop1" } } */
-/* { dg-final { scan-tree-dump-times "\\+" 1 "forwprop1" } } */
+/* Only z = x + 1 is retained.  */
+/* { dg-final { scan-tree-dump-times " = " 1 "forwprop1" } } */
+/* { dg-final { scan-tree-dump "return 0;" "forwprop1" } } */