[LLVMbugs] [Bug 18737] Missed optimization is switch

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Wed Mar 4 08:59:36 PST 2015


Hans Wennborg <hans at chromium.org> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #7 from Hans Wennborg <hans at chromium.org> ---
Thanks for updating the bug!

Yes, this got fixed by Erik in

In 3.6 we generate:

    leal    -1(%rdi), %ecx
    xorl    %eax, %eax
    cmpl    $4, %ecx
    cmovbl    %edi, %eax

After http://llvm.org/viewvc/llvm-project/?view=rev&revision=227125, we also
exploit unreachable default cases, so with 3.7 the example above compiles to:

    movl    %edi, %eax

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