[Bug c++/100956] Unused variable warnings ignore "if constexpr" blocks where variables are conditionally used

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100956 --- Comment #2 from Matt Bentley --- Thank you - I'm aware GCC might optimize it out (and failed to test with GCC10), at least in O2 mode, but other compilers might not, hence the code.

[Bug c++/100956] New: Unused variable warnings ignore "if constexpr" blocks where variables are conditionally used

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100956 Bug ID: 100956 Summary: Unused variable warnings ignore "if constexpr" blocks where variables are conditionally used Product: gcc Version: 9.2.0 Status: UNCONFIRMED

[Bug middle-end/96750] 10-12% performance decrease in benchmark going from GCC8 to GCC9/GCC10

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96750 --- Comment #6 from Matt Bentley --- Created attachment 49278 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=49278=edit Demonstration of code which doesn't trigger the performance anomaly. plf_colony_fast.h does not trigger the problem,

[Bug middle-end/96750] 10-12% performance decrease in benchmark going from GCC8 to GCC9/GCC10

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96750 --- Comment #5 from Matt Bentley --- If anyone out there is interested in working on this, I found the smallest change possible to create the same performance as GCC8- it is literally eliminating one branch possibility in one function