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[Bug middle-end/36194] [4.2/4.3/4.4 Regression] Truncation optimization in combine can remove necessary truncations
- From: "nemet at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 15 May 2008 19:28:46 -0000
- Subject: [Bug middle-end/36194] [4.2/4.3/4.4 Regression] Truncation optimization in combine can remove necessary truncations
- References: <bug-36194-4297@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #3 from nemet at gcc dot gnu dot org 2008-05-15 19:28 -------
Subject: Bug 36194
Author: nemet
Date: Thu May 15 19:25:53 2008
New Revision: 135392
URL: http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=135392
Log:
PR middle-end/36194
* combine.c (check_conversion): Rename to check_promoted_subreg.
Don't call record_truncated_value from here.
(record_truncated_value): Turn it into a for_each_rtx callback.
(record_truncated_values): New function.
(combine_instructions): Call note_uses with
record_truncated_values. Change name of check_conversion to
check_promoted_subreg.
testsuite/
* gcc.dg/pr36194.c: New test.
Added:
trunk/gcc/testsuite/gcc.dg/pr36194.c
Modified:
trunk/gcc/ChangeLog
trunk/gcc/combine.c
trunk/gcc/testsuite/ChangeLog
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=36194