ipa/104303 - revert overly conservative DCE change

The following reverts the DCE change back to the original behavior
which should be handled well during the propagation stage.  That
should fix the failures Thomas Schwinge is reporting.

2022-04-12  Richard Biener  <rguenther@suse.de>

	PR ipa/104303
	* tree-ssa-dce.cc (mark_stmt_if_obviously_necessary): Do not
	include local escaped memory as obviously necessary stores.

diff --git a/gcc/tree-ssa-dce.cc b/gcc/tree-ssa-dce.cc
index 34ce8ab..2067b71 100644 (file)
--- a/gcc/tree-ssa-dce.cc
+++ b/gcc/tree-ssa-dce.cc
@@ -315,7 +315,7 @@ mark_stmt_if_obviously_necessary (gimple *stmt, bool aggressive)
     }
 
   if ((gimple_vdef (stmt) && keep_all_vdefs_p ())
-      || stmt_may_clobber_global_p (stmt, true))
+      || stmt_may_clobber_global_p (stmt, false))
     {
       mark_stmt_necessary (stmt, true);
       return;