Re: gcc does not reduce the function call to the result if called function is not static when using -O2, only with -O3, clang and msvc do the optimization also with -O2

2020-12-05 Thread Dennis Luehring via Gcc
Am 05.12.2020 um 14:25 schrieb Eric Botcazou: > can someone explain to me why the -O2 optimizer is not able(allowed) to > reduce this small sample the same way as clang/msvc? Change the name of the function to something else than "main". that works, thanks!

Re: gcc does not reduce the function call to the result if called function is not static when using -O2, only with -O3, clang and msvc do the optimization also with -O2

2020-12-05 Thread Dennis Luehring via Gcc
Am 05.12.2020 um 13:04 schrieb Jan Hubicka: > gcc does not reduce to call result if called function is not static in > -O2 (will do with -O2) > clang and msvc does it also in -O2 regardless of the function beeing > static or not > > can someone explain to me why the -O2 optimizer is not able(allo

Re: gcc does not reduce the function call to the result if called function is not static when using -O2, only with -O3, clang and msvc do the optimization also with -O2

2020-12-05 Thread Eric Botcazou
> can someone explain to me why the -O2 optimizer is not able(allowed) to > reduce this small sample the same way as clang/msvc? Change the name of the function to something else than "main". -- Eric Botcazou

Re: gcc does not reduce the function call to the result if called function is not static when using -O2, only with -O3, clang and msvc do the optimization also with -O2

2020-12-05 Thread Jan Hubicka
> gcc does not reduce to call result if called function is not static in > -O2 (will do with -O2) > clang and msvc does it also in -O2 regardless of the function beeing > static or not > > can someone explain to me why the -O2 optimizer is not able(allowed) to > reduce this small sample the same w

gcc does not reduce the function call to the result if called function is not static when using -O2, only with -O3, clang and msvc do the optimization also with -O2

2020-12-05 Thread Dennis Luehring via Gcc
gcc does not reduce to call result if called function is not static in -O2 (will do with -O2) clang and msvc does it also in -O2 regardless of the function beeing static or not can someone explain to me why the -O2 optimizer is not able(allowed) to reduce this small sample the same way as clang/m