[Bug target/125907] Missed Optimization (x86 bit-test `bt`)

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125907

--- Comment #3 from Hongtao Liu <liuhongt at gcc dot gnu.org> ---

> 
> But it only accepts nonimmediate_operand, but here for the testcase in the
> PR, it's const_int 0
> 
> Failed to match this instruction:
> (set (reg:SI 99 [ <retval> ])
>     (if_then_else:SI (ne (and:SI (reg:SI 103 [ _1 ])
>                 (const_int 1 [0x1]))
>             (const_int 0 [0]))
>         (reg:SI 107 [ c ])
>         (const_int 0 [0])))

Also it's not simplified to zero_extract