[LLVMdev] Optimizing out redundant alloca involving byval params

[Reid Kleckner]

I think lib/Transforms/Scalar/MemCpyOptimizer.cpp might be the right place
for this, considering that most frontends will use memcpy for that copy
anyway. It already has some logic for byval args.

On Thu, Mar 5, 2015 at 3:51 PM, Mircea Trofin <mtrofin at google.com> wrote:

> Hello all,
>
> I'm trying to find the pass that would convert from:
>
> define void @main(%struct* byval %ptr) {
>   %val = load %struct* %ptr
>   %val.ptr = alloca %struct
>   store %struct %val, %struct* %val.ptr
>   call void @extern_func(%struct* byval %val.ptr)
>   ret void
> }
>
> to this:
> define void @main(%struct* byval %ptr) {
>   call void @extern_func(%struct* byval %ptr)
>   ret void
> }
>
> First, am I missing something - would this be a correct optimization?
>
> Thank you,
> Mircea.
>
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