[Bug tree-optimization/127853] [16 Regression] x86 (non BMI): .CTZ(x, N) returns 32 when bsr insn result could be undefined since r16-1202

[jakub at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127853

Jakub Jelinek <jakub at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Target Milestone|17.0                        |16.3
            Summary|x86 (non BMI): .CTZ(x, N)   |[16 Regression] x86 (non
                   |returns 32 when bsr insn    |BMI): .CTZ(x, N) returns 32
                   |result could be undefined   |when bsr insn result could
                   |                            |be undefined since r16-1202

--- Comment #13 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
This (at least the i386/clz-ctz-table-zero.c testcase) regressed with
r16-1202-g4a80eaefd93c2f1f7c9b71dbc1b97783214b7b2f