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[Bug rtl-optimization/64081] [5/6/7 Regression] r217827 prevents RTL loop unroll
- From: "aldyh at redhat dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: Mon, 06 Feb 2017 12:16:17 +0000
- Subject: [Bug rtl-optimization/64081] [5/6/7 Regression] r217827 prevents RTL loop unroll
- Auto-submitted: auto-generated
- References: <bug-64081-4@http.gcc.gnu.org/bugzilla/>
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64081
Aldy Hernandez <aldyh at redhat dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |aldyh at redhat dot com
--- Comment #41 from Aldy Hernandez <aldyh at redhat dot com> ---
Created attachment 40674
--> https://gcc.gnu.org/bugzilla/attachment.cgi?id=40674&action=edit
miscompiled tree-ssa-structalias.ii on AIX
It looks like tree-ssa-structalias.c is being miscompiled, particularly
build_pred_graph. If I add __attribute__((optimize("-O0"))) to
build_pred_cgraph's definition and rebuild stage2's cc1 we have a
non-segfaulting cc1.
I wonder if we can now build a cross (with attachment 40673) to
--target=powerpc-ibm-aix7.2.0.0 and use the attached tree-ssa-structalias.ii to
compare before and after dumps.