[Bug rtl-optimization/94873] [8/9/10/11 Regression] wrong code with -O -fno-merge-constants -fno-split-wide-types -fno-tree-fre

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94873

--- Comment #10 from Segher Boessenkool <segher at gcc dot gnu.org> ---
Oh, and ideally, we would replace the whole REG_EQ* stuff with a more
powerful interface that is to-the-side, not embedded in the instruction
stream.  For known exact values, nonzero_bits, known ranges, the works.