[Bug tree-optimization/94930] Failure to optimize out subvsi in expansion of __builtin_memcmp with 1 as the operand with -ftrapv

2021-12-22 Thread pinskia at gcc dot gnu.org via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94930 Andrew Pinski changed: What|Removed |Added Ever confirmed|0 |1 Last reconfirmed|

[Bug tree-optimization/94930] Failure to optimize out subvsi in expansion of __builtin_memcmp with 1 as the operand with -ftrapv

2021-04-25 Thread pinskia at gcc dot gnu.org via Gcc-bugs
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94930 Andrew Pinski changed: What|Removed |Added Severity|normal |enhancement

[Bug tree-optimization/94930] Failure to optimize out subvsi in expansion of __builtin_memcmp with 1 as the operand with -ftrapv

2020-05-03 Thread glisse at gcc dot gnu.org
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94930 --- Comment #1 from Marc Glisse --- AFAIK -ftrapv doesn't work very well and is kind of abandoned, in favor of -fsanitize=signed-integer-overflow (possibly with -fsanitize-undefined-trap-on-error), which does generate the code you expect.