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[Bug middle-end/28545] [4.1 Regression] Wrong code for hoisted multiplication
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 14 Oct 2006 09:26:49 -0000
- Subject: [Bug middle-end/28545] [4.1 Regression] Wrong code for hoisted multiplication
- References: <bug-28545-7172@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #7 from rguenth at gcc dot gnu dot org 2006-10-14 09:26 -------
It's a VRP bug :/ Before VRP we have
D.6958_313 = cr_285 * cr_285;
D.6959_314 = (size_t) D.6958_313;
D.6960_315 = cr_285 + 1;
memset (number_287, D.6960_315, D.6959_314);
and after we get introduced a spurious, uninitialized cr_2738
D.6958_313 = cr_285 * cr_2738;
D.6959_314 = (size_t) D.6958_313;
D.6960_315 = cr_285 + 1;
memset (number_287, D.6960_315, D.6959_314);
this get's generated by
cr_2738 = ASSERT_EXPR <cr_285, x_1 < cr_285>;
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=28545