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Subject: [Bug target/65660] [5 Regression] 252.eon regression on bdver2 with -Ofast
Date: Thu, 09 Apr 2015 07:30:00 -0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65660

--- Comment #20 from Richard Biener <rguenth at gcc dot gnu.org> ---
(In reply to Jan Hubicka from comment #17)
> Actually it seems that the tester was used to test the change and it was
> applied at
> Nov 7, 2012 03:02 UTC
>     (Values: Base: 164.gzip: 1269, 175.vpr: 1245, 176.gcc: 1627, 181.mcf:
> 868, 186.crafty: 2219, 197.parser: 1020, 252.eon: 1942, 253.perlbmk: 1784,
> 254.gap: 1558, 255.vortex: 1861, 256.bzip2: 1277, 300.twolf: 1547, SPECint:
> 1468 Peak: , 164.gzip: 1323, 175.vpr: 1300, 176.gcc: 1655, 181.mcf: 868,
> 186.crafty: 2235, 197.parser: 1038, 252.eon: 2760, 253.perlbmk: 1938,
> 254.gap: 1606, 255.vortex: 1867, 256.bzip2: 1290, 300.twolf: 1556, SPECint:
> 1546)
> Nov 6, 2012 08:00 UTC
>     (Values: Base: 164.gzip: 1264, 175.vpr: 1239, 176.gcc: 1630, 181.mcf:
> 856, 186.crafty: 2222, 197.parser: 991, 252.eon: 2461, 253.perlbmk: 1783,
> 254.gap: 1556, 255.vortex: 1864, 256.bzip2: 1275, 300.twolf: 1551, SPECint:
> 1492 Peak: , 164.gzip: 1322, 175.vpr: 1293, 176.gcc: 1657, 181.mcf: 864,
> 186.crafty: 2244, 197.parser: 1049, 252.eon: 2716, 253.perlbmk: 1916,
> 254.gap: 1614, 255.vortex: 1880, 256.bzip2: 1299, 300.twolf: 1556, SPECint:
> 1544)

r193208 (good) to r193279 (bad)

my bet is either inlining or the unrolling change (though -O2 -ffast-math
shouldn't unroll too much).