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Update the memcpy rewriting to fully support widened int rewriting. This

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includes extracting ints for copying elsewhere and inserting ints when
copying into the alloca. This should fix the CanSROA assertion coming
out of Clang's regression test suite.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165931 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chandler Carruth 2012-10-15 10:24:43 +00:00
parent 94fc64c42f
commit d2cd73f6a5
2 changed files with 31 additions and 9 deletions
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34
lib/Transforms/Scalar/SROA.cpp
View File

@ -2717,9 +2717,9 @@ private:
// If this doesn't map cleanly onto the alloca type, and that type isn't
// a single value type, just emit a memcpy.
bool EmitMemCpy
= !VecTy && (BeginOffset != NewAllocaBeginOffset ||
EndOffset != NewAllocaEndOffset ||
!NewAI.getAllocatedType()->isSingleValueType());
= !VecTy && !IntTy && (BeginOffset != NewAllocaBeginOffset ||
EndOffset != NewAllocaEndOffset ||
!NewAI.getAllocatedType()->isSingleValueType());
// If we're just going to emit a memcpy, the alloca hasn't changed, and the
// size hasn't been shrunk based on analysis of the viable range, this is
@ -2741,14 +2741,23 @@ private:
if (Pass.DeadSplitInsts.insert(&II))
Pass.DeadInsts.push_back(&II);
bool IsVectorElement = VecTy && (BeginOffset > NewAllocaBeginOffset ||
EndOffset < NewAllocaEndOffset);
bool IsWholeAlloca = BeginOffset == NewAllocaBeginOffset &&
EndOffset == NewAllocaEndOffset;
bool IsVectorElement = VecTy && !IsWholeAlloca;
uint64_t Size = EndOffset - BeginOffset;
IntegerType *SubIntTy
= IntTy ? Type::getIntNTy(IntTy->getContext(), Size*8) : 0;
Type *OtherPtrTy = IsDest ? II.getRawSource()->getType()
: II.getRawDest()->getType();
if (!EmitMemCpy)
OtherPtrTy = IsVectorElement ? VecTy->getElementType()->getPointerTo()
: NewAI.getType();
if (!EmitMemCpy) {
if (IsVectorElement)
OtherPtrTy = VecTy->getElementType()->getPointerTo();
else if (IntTy && !IsWholeAlloca)
OtherPtrTy = SubIntTy->getPointerTo();
else
OtherPtrTy = NewAI.getType();
}
// Compute the other pointer, folding as much as possible to produce
// a single, simple GEP in most cases.
@ -2795,11 +2804,20 @@ private:
IRB.CreateAlignedLoad(SrcPtr, Align, getName(".copyload")),
getIndex(IRB, BeginOffset),
getName(".copyextract"));
} else if (IntTy && !IsWholeAlloca && !IsDest) {
Src = extractInteger(IRB, SubIntTy, BeginOffset);
} else {
Src = IRB.CreateAlignedLoad(SrcPtr, Align, II.isVolatile(),
getName(".copyload"));
}
if (IntTy && !IsWholeAlloca && IsDest) {
StoreInst *Store = insertInteger(IRB, Src, BeginOffset);
(void)Store;
DEBUG(dbgs() << " to: " << *Store << "\n");
return true;
}
if (IsVectorElement && IsDest) {
// We have to insert into a loaded copy before storing.
Src = IRB.CreateInsertElement(

6
test/Transforms/SROA/basictest.ll
View File

@ -1046,8 +1046,12 @@ entry:
; Or a memset of the whole thing.
call void @llvm.memset.p0i8.i64(i8* %0, i8 0, i64 8, i32 1, i1 false)
; Store to the high 32-bits...
; Write to the high 32-bits with a memcpy.
%X.sroa.0.4.raw_idx4.i = getelementptr inbounds i8* %0, i32 4
%d.raw = bitcast double* %d to i8*
call void @llvm.memcpy.p0i8.p0i8.i32(i8* %X.sroa.0.4.raw_idx4.i, i8* %d.raw, i32 4, i32 1, i1 false)
; Store to the high 32-bits...
%X.sroa.0.4.cast5.i = bitcast i8* %X.sroa.0.4.raw_idx4.i to i32*
store i32 1072693248, i32* %X.sroa.0.4.cast5.i, align 4