https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95810
Bug ID: 95810
Summary: Spurious UBSan warning when computing the opposite of
the absolute value of INT_MIN
Product: gcc
Version: 11.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: tree-optimization
Assignee: unassigned at gcc dot gnu.org
Reporter: felix.von.s at posteo dot de
Target Milestone: ---
When the expression (x <= 0 ? x : -x) with x having type int is compiled with
-fsanitize=undefined -O3, setting (x = INT_MIN) triggers a spurious UBSan
warning about INT_MIN being negated.
Not sure if I should file this against tree-ssa or the frontend(s), because the
expression apparently becomes (-ABS_EXPR <x>) very early, even at -O0. I
checked this with C, C++ and D frontends.
