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From: "wschmidt at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/53773] New: Vectorizer generates non-canonical multiplies
Date: Mon, 25 Jun 2012 22:16:00 -0000 [thread overview]
Message-ID: <bug-53773-4@http.gcc.gnu.org/bugzilla/> (raw)
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53773
Bug #: 53773
Summary: Vectorizer generates non-canonical multiplies
Classification: Unclassified
Product: gcc
Version: 4.8.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: wschmidt@gcc.gnu.org
CC: bergner@vnet.ibm.com, rguenther@suse.de
There are two tests in the regression testsuite for which the vectorizer
generates GIMPLE multiplies that are not canonical. Specifically, they
generate multiplies where rhs1 is a constant and rhs2 is an SSA name. The two
tests are:
(1) gcc.dg/vect/pr50451.c
(2) gfortran.dg/pr17143.f90
For (1), the generated GIMPLE includes:
integral_7 = 10 * integral_17;
...
decimal_8 = 10 * decimal_18;
For (2):
i.3_3 = 2 * prephitmp.9_23;
Probably best just to run these tests from the test suite to reproduce, but
here are the commands I used.
Example invocation for (1):
/home/wschmidt/gcc/build/gcc-mainline-slsrpt1a-debug/gcc/xgcc
-B/home/wschmidt/gcc/build/gcc-mainline-slsrpt1a-debug/gcc/
/home/wschmidt/gcc/gcc-mainline-slsrpt1a/gcc/testsuite/gcc.dg/vect/pr50451.c
-fno-diagnostics-show-caret -flto -maltivec -mvsx -mno-allow-movmisalign
-ftree-vectorize -fno-vect-cost-model -fno-common -O2 -fdump-tree-vect-details
-S -m64 -o pr50451.s
Example invocation for (2):
/home/wschmidt/gcc/install/gcc-mainline-slsrpt1a-debug/bin/gfortran
-B/home/wschmidt/gcc/build/gcc-mainline-slsrpt1a-debug/gcc/testsuite/gfortran3/../../
-B/home/wschmidt/gcc/build/gcc-mainline-slsrpt1a-debug/powerpc64-linux/32/libgfortran/
/home/wschmidt/gcc/gcc-mainline-slsrpt1a/gcc/testsuite/gfortran.dg/pr17143.f90
-fno-diagnostics-show-caret -O3 -fomit-frame-pointer -std=legacy
-B/home/wschmidt/gcc/build/gcc-mainline-slsrpt1a-debug/powerpc64-linux/32/libgfortran/.libs
-L/home/wschmidt/gcc/build/gcc-mainline-slsrpt1a-debug/powerpc64-linux/32/libgfortran/.libs
-L/home/wschmidt/gcc/build/gcc-mainline-slsrpt1a-debug/powerpc64-linux/32/libgfortran/.libs
-lm -m32 -o ./pr17143.exe
next reply other threads:[~2012-06-25 22:16 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-06-25 22:16 wschmidt at gcc dot gnu.org [this message]
2012-06-26 8:31 ` [Bug tree-optimization/53773] " jakub at gcc dot gnu.org
2012-06-26 8:36 ` rguenther at suse dot de
2012-06-26 8:52 ` rguenth at gcc dot gnu.org
2012-07-27 16:27 ` wschmidt at gcc dot gnu.org
2012-07-29 16:55 ` wschmidt at gcc dot gnu.org
2012-07-29 16:56 ` wschmidt at gcc dot gnu.org
2012-07-30 8:47 ` rguenther at suse dot de
2012-07-31 12:25 ` wschmidt at gcc dot gnu.org
2012-07-31 12:26 ` wschmidt at gcc dot gnu.org
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