[Bug rtl-optimization/75964] insn combiner removes comparison after ABS

[ebotcazou at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=75964

Eric Botcazou <ebotcazou at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |ebotcazou at gcc dot gnu.org

--- Comment #1 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> After pass .combine, the 2nd comparison is missing, presumably because
> combiner invokes signed overflow on ABS which does not apply because all
> computations are performed as unsigned.

Then you should have a warning with -Wstrict-overflow; this possibly comes from
simplify-rtx.c:simplify_const_relational_operation in this case.