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[Bug target/41156] [4.4/4.5 Regression] zlib segfault in inflate_table() compiled w/ -O -msse2 ftree-vectorize
- From: "hjl dot tools at gmail dot com" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 1 Sep 2009 13:20:04 -0000
- Subject: [Bug target/41156] [4.4/4.5 Regression] zlib segfault in inflate_table() compiled w/ -O -msse2 ftree-vectorize
- References: <bug-41156-682@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #7 from hjl dot tools at gmail dot com 2009-09-01 13:20 -------
Realign the incoming stack for vectorizer has very limited impact
on performance. Here are the differences of -m32 -O3 -msse2
-mfpmath=sse -ffast-math -funroll-loops before and after my patch:
400.perlbench -0.384615%
401.bzip2 0%
403.gcc -0.362319%
429.mcf -0.813008%
445.gobmk 0.921659%
456.hmmer 0.549451%
458.sjeng -0.438596%
462.libquantum 0%
464.h264ref 0%
471.omnetpp -0.478469%
473.astar -0.645161%
483.xalancbmk -0.727273%
SPECint(R)_base2006 -0.411523%
410.bwaves -0.406504%
416.gamess 0%
433.milc -1.36986%
434.zeusmp -0.44843%
435.gromacs 0%
436.cactusADM 0%
437.leslie3d -0.888889%
444.namd 1.20482%
447.dealII -0.350877%
450.soplex -0.31746%
453.povray 0.458716%
454.calculix 0%
459.GemsFDTD 0%
465.tonto 0%
470.lbm 0%
481.wrf 0.480769%
482.sphinx3 0.940439%
SPECfp(R)_base2006 0%
It won't change generated code if vectorizer isn't
enabled. Its benifits outweigh its drawbacks.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=41156