[LLVMdev] Any Optimization Suggestion to Get Rid of AddrSpaceCast around PHI

[Changpeng Fang]

In the following example, for some reasons, the input pointer entering the
loop was casted to generic pointer. How can the backend get rid of the
addrspacecast and use local store in the loop?


for.body.lr.ph: ; preds = %entry

%0 = addrspacecast i32 addrspace(3)* %in to i32 addrspace(4)*

br label %for.body

for.body: ; preds = %for.body, %for.body.lr.ph

%i.03 = phi i32 [ 0, %for.body.lr.ph ], [ %inc, %for.body ]

%ptr.02 = phi i32 addrspace(4)* [ %0, %for.body.lr.ph ], [ %add.ptr,
%for.body ]

store i32 %i.03, i32 addrspace(4)* %ptr.02, align 4

%add.ptr = getelementptr inbounds i32 addrspace(4)* %ptr.02, i64 4

%inc = add i32 %i.03, 1

%exitcond = icmp eq i32 %inc, %numElems

br i1 %exitcond, label %for.end, label %for.body

for.end: ; preds = %


Thanks;

Changpeng
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