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Subject: [Bug sanitizer/55309] gcc's address-sanitizer 66% slower than clang's
Date: Fri, 22 Feb 2013 07:11:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55309

--- Comment #43 from Kostya Serebryany <kcc at gcc dot gnu.org> 2013-02-22 07:11:06 UTC ---
gcc r196201:  -O2 -fno-aggressive-loop-optimizations
clang 175735: -O2 

x86_64 linux, both are using the new 7fff8000 shadow offset

       400.perlbench,      1136.00,        -1.00,        -0.00
           401.bzip2,       838.00,      1154.00,         1.38
             403.gcc,       716.00,       742.00,         1.04
             429.mcf,       582.00,       578.00,         0.99
           445.gobmk,       801.00,      1138.00,         1.42
           456.hmmer,      1277.00,      1515.00,         1.19
           458.sjeng,       869.00,      1258.00,         1.45
      462.libquantum,       532.00,       469.00,         0.88
         464.h264ref,      1303.00,      4395.00,         3.37
         471.omnetpp,       568.00,       585.00,         1.03
           473.astar,       647.00,       748.00,         1.16
       483.xalancbmk,       460.00,       534.00,         1.16
            433.milc,       659.00,       614.00,         0.93
            444.namd,       592.00,       531.00,         0.90
          447.dealII,       614.00,       706.00,         1.15
          450.soplex,       367.00,       406.00,         1.11
          453.povray,       423.00,       410.00,         0.97
             470.lbm,       377.00,       401.00,         1.06
         482.sphinx3,       958.00,      1325.00,         1.38

400.perlbench fails with a global-buffer-overflow which clang does not detect.
I did not investigate why. It could be a gcc false positive or clang false
negative.

464.h264ref is VERY slow, I did not look why.