[llvm-bugs] [Bug 19972] Bad code generation in post-ra ARMLoadStoreOptimizer pass in thumb1 mode

via llvm-bugs llvm-bugs at lists.llvm.org
Tue Jan 19 10:21:29 PST 2016


Renato Golin <renato.golin at linaro.org> changed:

           What    |Removed                     |Added
             Status|REOPENED                    |RESOLVED
                 CC|                            |renato.golin at linaro.org
         Resolution|---                         |FIXED

--- Comment #7 from Renato Golin <renato.golin at linaro.org> ---
Trunk generates:

    push    {r7, lr}
    add    r7, sp, #0
    ldm    r0!, {r1, r2}
    subs    r0, #8
    bl    bar
    pop    {r7, pc}

which, while inefficient (the sub is unnecessary with no write-back), looks

If people feel strongly about reducing code size for that sequence in Thumb1,
please open a new enhancement bug.

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