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[SROA] Use the correct index integer size in GEPs through non-default

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address spaces.

This isn't really a correctness issue (the values are truncated) but its
much cleaner.

Patch by Matt Arsenault!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@202252 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2014-02-26 10:08:16 +00:00
parent 18eab50e99
commit 2b442bffcb
2 changed files with 11 additions and 6 deletions
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15
lib/Transforms/Scalar/SROA.cpp
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@ -1290,6 +1290,9 @@ static Value *getNaturalGEPWithType(IRBuilderTy &IRB, const DataLayout &DL,
if (Ty == TargetTy)
return buildGEP(IRB, BasePtr, Indices, NamePrefix);
// Pointer size to use for the indices.
unsigned PtrSize = DL.getPointerTypeSizeInBits(BasePtr->getType());
// See if we can descend into a struct and locate a field with the correct
// type.
unsigned NumLayers = 0;
@ -1297,11 +1300,13 @@ static Value *getNaturalGEPWithType(IRBuilderTy &IRB, const DataLayout &DL,
do {
if (ElementTy->isPointerTy())
break;
if (SequentialType *SeqTy = dyn_cast<SequentialType>(ElementTy)) {
ElementTy = SeqTy->getElementType();
// Note that we use the default address space as this index is over an
// array or a vector, not a pointer.
Indices.push_back(IRB.getInt(APInt(DL.getPointerSizeInBits(0), 0)));
if (ArrayType *ArrayTy = dyn_cast<ArrayType>(ElementTy)) {
ElementTy = ArrayTy->getElementType();
Indices.push_back(IRB.getIntN(PtrSize, 0));
} else if (VectorType *VectorTy = dyn_cast<VectorType>(ElementTy)) {
ElementTy = VectorTy->getElementType();
Indices.push_back(IRB.getInt32(0));
} else if (StructType *STy = dyn_cast<StructType>(ElementTy)) {
if (STy->element_begin() == STy->element_end())
break; // Nothing left to descend into.

2
test/Transforms/SROA/basictest.ll
View File

@ -1160,7 +1160,7 @@ entry:
; CHECK: alloca [16 x i8], align 8
%gep = getelementptr inbounds { [16 x i8] } addrspace(1)* %ptr, i64 -1
; CHECK-NEXT: getelementptr inbounds { [16 x i8] } addrspace(1)* %ptr, i16 -1, i32 0, i64 0
; CHECK-NEXT: getelementptr inbounds { [16 x i8] } addrspace(1)* %ptr, i16 -1, i32 0, i16 0
%cast1 = bitcast { [16 x i8 ] } addrspace(1)* %gep to i8 addrspace(1)*
%cast2 = bitcast { [16 x i8 ] }* %a to i8*