[Bug middle-end/78103] Failure to optimize with __builtin_clzl

[prathamesh3492 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78103

prathamesh3492 at gcc dot gnu.org changed:

           What    |Removed                     |Added
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                 CC|                            |prathamesh3492 at gcc dot gnu.org

--- Comment #6 from prathamesh3492 at gcc dot gnu.org ---
With trunk on arm-linux-gnueabihf, nearly identical code is generated for
findLastSet and findLastSet2.

findLastSet:
        cmp     r0, #0
        clzne   r0, r0
        rsbne   r0, r0, #32
        bx      lr

findLastSet2:
        cmp     r0, #0
        clzne   r0, r0
        eorne   r0, r0, #31
        addne   r0, r0, #1
        bx      lr