[LLVMbugs] [Bug 18737] Missed optimization is switch

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=18737

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
http://llvm.org/viewvc/llvm-project?rev=222121&view=rev.

In 3.6 we generate:

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

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
    retq

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