[llvm-dev] llvm optimizer turning musttail into tail

Sean Silva via llvm-dev
2016-11-27T00:06:41Z

This sounds buggy to me. What pass is doing this?

-- Sean Silva

On Thu, Nov 24, 2016 at 5:39 AM, Carlo Kok via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

>
> I've got some calls like:
>
> musttail call void bitcast (i32 (i32, i8*, %Type*)* @MyMethod to void
> (i32, i8*)*)(i32 %0, i8* %1)
> ret void
>
> Into something like:
> %8 = tail call i32 @MyMethod(i32 %0, i8* %1, %Type* null)
> ret void
>
> I realize I'm losing a parameter there, but this is an interface jump
> trick I use and relies on the end code being a 'jmp' (x86). I
realize i can
> probably use noopt & noinline to do this trick, but I do want llvm to
> optimize and inline calls if it can prove it always calls a given method.
> Any way i can do this?
>
> --
> Carlo Kok
> RemObjects Software
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