[Bug tree-optimization/108418] New: gcc does not optimize trivial code

2023-01-16 Thread socketpair at gmail dot com via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108418 Bug ID: 108418 Summary: gcc does not optimize trivial code Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: tree-optimiza

[Bug tree-optimization/108418] gcc does not optimize trivial code

2023-01-16 Thread socketpair at gmail dot com via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108418 --- Comment #1 from Коренберг Марк --- Sorry, but such kind of code happens as a result of C-code automatic generation.

[Bug regression/107767] New: GCC has some problems in optimizer of trivial case

2022-11-20 Thread socketpair at gmail dot com via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107767 Bug ID: 107767 Summary: GCC has some problems in optimizer of trivial case Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Componen

[Bug regression/107767] GCC has some problems in optimizer of trivial case

2022-11-20 Thread socketpair at gmail dot com via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107767 --- Comment #1 from Коренберг Марк --- See assembler output for firewall2(). It's not -Os optimized (compare to firewall(), which is ok) ``` firewall: movw64(%rdi), %ax cmpb$17, (%rdi) sete%cl leal

[Bug regression/107767] GCC has some problems in optimizer of trivial case

2022-11-21 Thread socketpair at gmail dot com via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107767 --- Comment #3 from Коренберг Марк --- I forgot to add. gcc 12.2 - everything is OK. gcc 13 - with bug.

[Bug tree-optimization/107767] [13 Regression] switch to table conversion happening even though using btq is better

2022-12-02 Thread socketpair at gmail dot com via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107767 --- Comment #5 from Коренберг Марк --- Not only -s problem. I think -O3 in gcc 12.2 will run faster than -O3 in gcc 13 (for this case). this code should not be treated as if-else-if-else-if. gcc 12 does its job right.

[Bug tree-optimization/107767] [13 Regression] switch to table conversion happening even though using btq is better

2022-12-02 Thread socketpair at gmail dot com via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107767 --- Comment #8 from Коренберг Марк --- Okay, but why switch-case is not handled using fast implementation using masks (when difference between smallest and biggest integer <=64 ? See the first function in my first message where it works as expe

[Bug tree-optimization/108215] New: Does not optimize trivial case with bit operations

2022-12-23 Thread socketpair at gmail dot com via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108215 Bug ID: 108215 Summary: Does not optimize trivial case with bit operations Product: gcc Version: 13.0 Status: UNCONFIRMED Severity: normal Priority: P3 Componen

[Bug c++/111577] New: -Os gives significantly bigger code than -O0

2023-09-24 Thread socketpair at gmail dot com via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111577 Bug ID: 111577 Summary: -Os gives significantly bigger code than -O0 Product: gcc Version: 14.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: c++

[Bug tree-optimization/116518] New: GCC does not optimize-out useless operations. Clang does.

2024-08-28 Thread socketpair at gmail dot com via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116518 Bug ID: 116518 Summary: GCC does not optimize-out useless operations. Clang does. Product: gcc Version: 15.0 Status: UNCONFIRMED Severity: normal Pri