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[Bug rtl-optimization/38373] New: 32-bit Vortex degradation on PPC due to bad RTL aliasing
- From: "luisgpm at linux dot vnet dot ibm dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 2 Dec 2008 15:09:39 -0000
- Subject: [Bug rtl-optimization/38373] New: 32-bit Vortex degradation on PPC due to bad RTL aliasing
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
The handling of LO_SUM by alias.c:find_base_term causes a degradation on 32-bit
vortex on PPC when used with the new REG_POINTER attribute.
Making "find_base_term" handle LO_SUM the same way as alias.c:find_base_value
fixes the problem. Preventing "find_base_term" from returning NULL so easily
also fixes the problem.
A fix for 4.5 will most probably be a combination of these two approaches.
--
Summary: 32-bit Vortex degradation on PPC due to bad RTL aliasing
Product: gcc
Version: 4.4.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: rtl-optimization
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: luisgpm at linux dot vnet dot ibm dot com
GCC build triplet: powerpc*-*-*
GCC host triplet: powerpc*-*-*
GCC target triplet: powerpc*-*-*
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38373