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[Bug tree-optimization/30590] [4.1/4.2/4.3 Regression] tree-nrv optimization clobbers return variable
- From: "spark at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 13 Mar 2007 18:29:03 -0000
- Subject: [Bug tree-optimization/30590] [4.1/4.2/4.3 Regression] tree-nrv optimization clobbers return variable
- References: <bug-30590-1501@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #9 from spark at gcc dot gnu dot org 2007-03-13 18:29 -------
How does this one look ? If it looks reasonable, I'll start the testing with
the mainline.
Index: tree-nrv.c
===================================================================
--- tree-nrv.c (revision 122871)
+++ tree-nrv.c (working copy)
@@ -163,6 +163,14 @@ tree_nrv (void)
result_type))
return 0;
}
+ else if (TREE_CODE (stmt) == GIMPLE_MODIFY_STMT)
+ {
+ tree addr = get_base_address (GIMPLE_STMT_OPERAND (stmt, 0));
+ /* If there's any MODIFY of component of RESULT,
+ then bail out. */
+ if (addr && addr == result)
+ return 0;
+ }
}
}
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=30590