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Recommit [SROA] Enhance SROA to handle `addrspacecast`ed allocas 

[SROA] Enhance SROA to handle `addrspacecast`ed allocas

- Fix typo in original change
- Add additional handling to ensure all return pointers are properly
  casted.

Summary:
- After `addrspacecast` is allowed to be eliminated in SROA, the
  adjusting of storage pointer (from `alloca) needs to handle the
  potential different address spaces between the storage pointer (from
  alloca) and the pointer being used.

Reviewers: arsenm

Subscribers: wdng, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D63501

llvm-svn: 363743
This commit is contained in:
Michael Liao 2019-06-18 21:41:13 +00:00
parent 7bfb43985f
commit 4f7f70e262
2 changed files with 22 additions and 1 deletions
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8
llvm/lib/Transforms/Scalar/SROA.cpp
View File

@ -1589,6 +1589,12 @@ static Value *getAdjustedPtr(IRBuilderTy &IRB, const DataLayout &DL, Value *Ptr,
PointerType *TargetPtrTy = cast<PointerType>(PointerTy);
Type *TargetTy = TargetPtrTy->getElementType();
// As `addrspacecast` is , `Ptr` (the storage pointer) may have different
// address space from the expected `PointerTy` (the pointer to be used).
// Adjust the pointer type based the original storage pointer.
auto AS = cast<PointerType>(Ptr->getType())->getAddressSpace();
PointerTy = TargetTy->getPointerTo(AS);
do {
// First fold any existing GEPs into the offset.
while (GEPOperator *GEP = dyn_cast<GEPOperator>(Ptr)) {
@ -1617,7 +1623,7 @@ static Value *getAdjustedPtr(IRBuilderTy &IRB, const DataLayout &DL, Value *Ptr,
OffsetBasePtr = Ptr;
// If we also found a pointer of the right type, we're done.
if (P->getType() == PointerTy)
return P;
break;
}
// Stash this pointer if we've found an i8*.

15
llvm/test/Transforms/SROA/addrspacecast.ll
View File

@ -299,6 +299,21 @@ define void @select_addrspacecast_gv(i1 %a, i1 %b) {
ret void
}
; CHECK-LABEL: @select_addrspacecast_i8(
; CHECK: [[SEL:%.*]] = select i1 undef, i8 undef, i8 undef
; CHECK-NEXT: ret i8 [[SEL]]
define i8 @select_addrspacecast_i8() {
%a = alloca i8
%b = alloca i8
%a.ptr = addrspacecast i8* %a to i8 addrspace(1)*
%b.ptr = addrspacecast i8* %b to i8 addrspace(1)*
%ptr = select i1 undef, i8 addrspace(1)* %a.ptr, i8 addrspace(1)* %b.ptr
%ret = load i8, i8 addrspace(1)* %ptr
ret i8 %ret
}
!0 = !{!1, !1, i64 0, i64 1}
!1 = !{!2, i64 1, !"type_0"}
!2 = !{!"root"}