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Extract code for reducing a type to a single value type into a helper function.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@163817 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2012-09-13 18:19:06 +00:00
parent b54834b7e6
commit ce52bc5353
1 changed files with 21 additions and 15 deletions
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36
lib/Transforms/InstCombine/InstCombineCalls.cpp
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@ -29,6 +29,26 @@ static Type *getPromotedType(Type *Ty) {
return Ty;
}
/// reduceToSingleValueType - Given an aggregate type which ultimately holds a
/// single scalar element, like {{{type}}} or [1 x type], return type.
static Type *reduceToSingleValueType(Type *T) {
while (!T->isSingleValueType()) {
if (StructType *STy = dyn_cast<StructType>(T)) {
if (STy->getNumElements() == 1)
T = STy->getElementType(0);
else
break;
} else if (ArrayType *ATy = dyn_cast<ArrayType>(T)) {
if (ATy->getNumElements() == 1)
T = ATy->getElementType();
else
break;
} else
break;
}
return T;
}
Instruction *InstCombiner::SimplifyMemTransfer(MemIntrinsic *MI) {
unsigned DstAlign = getKnownAlignment(MI->getArgOperand(0), TD);
@ -80,20 +100,7 @@ Instruction *InstCombiner::SimplifyMemTransfer(MemIntrinsic *MI) {
if (TD && SrcETy->isSized() && TD->getTypeStoreSize(SrcETy) == Size) {
// The SrcETy might be something like {{{double}}} or [1 x double]. Rip
// down through these levels if so.
while (!SrcETy->isSingleValueType()) {
if (StructType *STy = dyn_cast<StructType>(SrcETy)) {
if (STy->getNumElements() == 1)
SrcETy = STy->getElementType(0);
else
break;
} else if (ArrayType *ATy = dyn_cast<ArrayType>(SrcETy)) {
if (ATy->getNumElements() == 1)
SrcETy = ATy->getElementType();
else
break;
} else
break;
}
SrcETy = reduceToSingleValueType(SrcETy);
if (SrcETy->isSingleValueType()) {
NewSrcPtrTy = PointerType::get(SrcETy, SrcAddrSp);
@ -102,7 +109,6 @@ Instruction *InstCombiner::SimplifyMemTransfer(MemIntrinsic *MI) {
}
}
// If the memcpy/memmove provides better alignment info than we can
// infer, use it.
SrcAlign = std::max(SrcAlign, CopyAlign);