[Bug target/78994] -Ofast makes aarch64 C++ benchmark slower for A53

2021-05-04 Thread rguenth at gcc dot gnu.org via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78994 Richard Biener changed: What|Removed |Added Status|NEW |ASSIGNED

[Bug target/78994] -Ofast makes aarch64 C++ benchmark slower for A53

2017-09-14 Thread wilco at gcc dot gnu.org
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78994 Wilco changed: What|Removed |Added Status|UNCONFIRMED |NEW Last reconfirmed|

[Bug target/78994] -Ofast makes aarch64 C++ benchmark slower for A53

2017-04-14 Thread tulipawn at gmail dot com
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78994 --- Comment #9 from PeteVine --- Well, yes, that fixes the -Ofast issue for me: -mcpu=cortex-a53 -frename-registers iir:65952 ns per loop iir_2: 63098 ns per loop -mcpu=cortex-a57 (-frename-registers) iir:62839 ns per loop iir_2:

[Bug target/78994] -Ofast makes aarch64 C++ benchmark slower for A53

2017-04-12 Thread wilco at gcc dot gnu.org
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78994 wilco at gcc dot gnu.org changed: What|Removed |Added CC||wilco at gcc dot gnu.org ---

[Bug target/78994] -Ofast makes aarch64 C++ benchmark slower for A53

2017-03-04 Thread tulipawn at gmail dot com
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78994 --- Comment #7 from PeteVine --- Not affected by -mno-fix-cortex-a53-843419 which gives the issue full validity. -Ofast pessimizes Cortex A53 codegen somehow and switching to e.g. -mcpu=cortex-a57 fixes it. (tested on trunk)

[Bug target/78994] -Ofast makes aarch64 C++ benchmark slower for A53

2017-01-14 Thread tulipawn at gmail dot com
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78994 --- Comment #6 from PeteVine --- It's possible I already had that patch included in my build, but in case I didn't, here's a quick addition to the previous result: http://openbenchmarking.org/result/1701143-TA-GCCCOMPAR66 The c-ray thunderx

[Bug target/78994] -Ofast makes aarch64 C++ benchmark slower for A53

2017-01-12 Thread pinskia at gcc dot gnu.org
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78994 --- Comment #5 from Andrew Pinski --- https://gcc.gnu.org/ml/gcc-patches/2017-01/msg00637.html

[Bug target/78994] -Ofast makes aarch64 C++ benchmark slower for A53

2017-01-12 Thread tulipawn at gmail dot com
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78994 --- Comment #4 from PeteVine --- I'm delighted to report **not** targeting Cortex-A53 actually incurs a performance penalty sometimes ;) http://openbenchmarking.org/result/1701128-TA-GCCCOMPAR79

[Bug target/78994] -Ofast makes aarch64 C++ benchmark slower for A53

2017-01-04 Thread tulipawn at gmail dot com
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78994 --- Comment #3 from PeteVine --- Hey, that works for me too! (62565 vs 70758 in favour of -Ofast). Usefully strange :)

[Bug target/78994] -Ofast makes aarch64 C++ benchmark slower for A53

2017-01-04 Thread pinskia at gcc dot gnu.org
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78994 Andrew Pinski changed: What|Removed |Added Summary|-Ofast makes aarch64 C++|-Ofast makes aarch64 C++