On Wed, Feb 27, 2013 at 11:27 PM, Chris Wilson <chris at chris-wilson.co.uk> wrote: > On Wed, Feb 27, 2013 at 06:59:58PM +0100, Sedat Dilek wrote: >> How can I compare a gcc-4.6 and clang-3.2 compiled binaries? >> Thinking of miscompiling and/or benchmarking. > > The real test is whether you can measure a difference in a benchmark > like cairo-perf-trace. There are a few traces that are sensitive to CPU > optimisations. > > To maximise the likelihood of spotting a difference though you will want > to use microbenchmarks like x11perf, x11perf -aa10text would be a prime > candidate. > > The last set of errors reported when compiled with Clang were during > trapezoid rasterisation triggered whilst using normal Gtk+ and Qt apps. > They have a tendency to hit all the corner cases. > -Chris > > -- > Chris Wilson, Intel Open Source Technology Centre Attached 'x11perf -aa10text' with clang-3.2 and gcc-4.6. - Sedat . -------------- next part -------------- $ x11perf -aa10text x11perf - X11 performance program, version 1.2 The X.Org Foundation server version 11103000 on :0 from fambox Thu Feb 28 00:25:23 2013 Sync time adjustment is 0.0446 msecs. 6400000 reps @ 0.0008 msec (1240000.0/sec): Char in 80-char aa line (Charter 10) 6400000 reps @ 0.0008 msec (1240000.0/sec): Char in 80-char aa line (Charter 10) 6400000 reps @ 0.0008 msec (1240000.0/sec): Char in 80-char aa line (Charter 10) 6400000 reps @ 0.0008 msec (1240000.0/sec): Char in 80-char aa line (Charter 10) 6400000 reps @ 0.0008 msec (1240000.0/sec): Char in 80-char aa line (Charter 10) 32000000 trep @ 0.0008 msec (1240000.0/sec): Char in 80-char aa line (Charter 10) -dileks // 28-Feb-2013 -------------- next part -------------- $ x11perf -aa10text x11perf - X11 performance program, version 1.2 The X.Org Foundation server version 11103000 on :1 from fambox Thu Feb 28 00:29:02 2013 Sync time adjustment is 0.0390 msecs. 16000000 reps @ 0.0005 msec (2110000.0/sec): Char in 80-char aa line (Charter 10) 16000000 reps @ 0.0005 msec (2120000.0/sec): Char in 80-char aa line (Charter 10) 16000000 reps @ 0.0005 msec (2110000.0/sec): Char in 80-char aa line (Charter 10) 16000000 reps @ 0.0005 msec (2010000.0/sec): Char in 80-char aa line (Charter 10) 16000000 reps @ 0.0005 msec (2050000.0/sec): Char in 80-char aa line (Charter 10) 80000000 trep @ 0.0005 msec (2080000.0/sec): Char in 80-char aa line (Charter 10) -dileks // 28-Feb-2013
