[llvm-dev] question about mem2reg

Heejin Ahn via llvm-dev
Sun, 15 Oct 2017 10:22:38 -0000

Hello Linhai,

When compiled with -O0, clang 5.0 started to add optnone attribute to each
function, which prevents further optimizations afterwards including mem2reg
pass. To prevent that, add "-Xclang -disable-O0-optnone" to clang
command
line arguments.

Thank you,
Heejin

On Sat, Oct 14, 2017 at 8:59 PM Linhai Song via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Hello,
>
>
> I just upgraded my llvm to 5.0.0. I applied mem2reg pass as follows:
>
>
> opt -mem2reg m2rtttl.bc > m2rtttl.opt
>
>
> But after that, I compared m2rtttl.bc and m2rtttl.opt. I noticed that
> there are no difference between m2rtttl.bc and m2rtttl.opt. Did I apply
> llvm in the correct way?
>
>
> Thanks a lot for the help!
>
>
> Best,
>
>
>                            Linhai
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> llvm-dev at lists.llvm.org
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