https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115192
--- Comment #4 from Jukka Suomela <jukka.suomela at aalto dot fi> --- Created attachment 58271 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=58271&action=edit Another example, miscompiles with GCC 11 (-O3 -march=skylake) Here is a minor variant of the theme. This variant seems to fail already on GCC 11 if I compile with -O3 -march=skylake. Expected: $ g++-11 -Wall -Wextra test.cc -O2 -march=skylake -o test && ./test 0.000000 0.000000 11.000000 22.000000 22.000000 44.000000 Unexpected: $ g++-11 -Wall -Wextra test.cc -O3 -march=skylake -o test && ./test 0.000000 0.000000 11.000000 22.000000 11.000000 22.000000 This was with g++-11 (Ubuntu 11.4.0-1ubuntu1~22.04) 11.4.0 on x86_64-linux-gnu. In godbolt.org GCC 11.1 seemed to be the first version where this behavior started. (Apologies if this should be a separate bug report. I posted this here, as I suspect the bugs might be related.)
