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* [Bug rtl-optimization/61926] New: const-anchor optimisation is sensitive to ordering
@ 2014-07-27 9:44 rsandifo at gcc dot gnu.org
2014-07-27 9:51 ` [Bug rtl-optimization/61926] " rsandifo at gcc dot gnu.org
0 siblings, 1 reply; 2+ messages in thread
From: rsandifo at gcc dot gnu.org @ 2014-07-27 9:44 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61926
Bug ID: 61926
Summary: const-anchor optimisation is sensitive to ordering
Product: gcc
Version: unknown
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: rtl-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: rsandifo at gcc dot gnu.org
Target: mips*-*-*
gcc.target/mips/const-anchor-1.c tests that cse uses constant anchors for:
g (0x1233ffff, 0x12340001);
But this does not work for:
g (0x12340001, 0x1233ffff);
since the constant that provides the 0x12340000 anchor then comes after
the constant that requires it. Maybe this could fixed by doing the
anchor optimisation in gcse.c instead, although that probably isn't
trivial.
Related to PR33699.
^ permalink raw reply [flat|nested] 2+ messages in thread
* [Bug rtl-optimization/61926] const-anchor optimisation is sensitive to ordering
2014-07-27 9:44 [Bug rtl-optimization/61926] New: const-anchor optimisation is sensitive to ordering rsandifo at gcc dot gnu.org
@ 2014-07-27 9:51 ` rsandifo at gcc dot gnu.org
0 siblings, 0 replies; 2+ messages in thread
From: rsandifo at gcc dot gnu.org @ 2014-07-27 9:51 UTC (permalink / raw)
To: gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61926
--- Comment #1 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> ---
Author: rsandifo
Date: Sun Jul 27 09:50:56 2014
New Revision: 213093
URL: https://gcc.gnu.org/viewcvs?rev=213093&root=gcc&view=rev
Log:
gcc/testsuite/
PR rtl-optimization/61926
* gcc.target/mips/const-anchor-1.c, gcc.target/mips/const-anchor-2.c:
Reverse argument order.
* gcc.target/mips/const-anchor-3.c, gcc.target/mips/const-anchor-4.c:
New XFAILed tests that match the original order.
Added:
trunk/gcc/testsuite/gcc.target/mips/const-anchor-3.c
trunk/gcc/testsuite/gcc.target/mips/const-anchor-4.c
Modified:
trunk/gcc/testsuite/ChangeLog
trunk/gcc/testsuite/gcc.target/mips/const-anchor-1.c
trunk/gcc/testsuite/gcc.target/mips/const-anchor-2.c
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2014-07-27 9:44 [Bug rtl-optimization/61926] New: const-anchor optimisation is sensitive to ordering rsandifo at gcc dot gnu.org
2014-07-27 9:51 ` [Bug rtl-optimization/61926] " rsandifo at gcc dot gnu.org
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