[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||2021-12-23
 Status|UNCONFIRMED |NEW

--- Comment #2 from Andrew Pinski  ---
Confirmed.

[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.