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we don't have to make an explicit copy of a byval argument when

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inlining a function if we know that the function does not write
to *any* memory.  This implements test/Transforms/Inline/byval2.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@45912 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2008-01-12 18:54:29 +00:00
parent 7723ab3a51
commit 92938b7145
2 changed files with 34 additions and 4 deletions
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10
lib/Transforms/Utils/InlineFunction.cpp
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@ -241,10 +241,12 @@ bool llvm::InlineFunction(CallSite CS, CallGraph *CG, const TargetData *TD) {
Value *ActualArg = *AI;
// When byval arguments actually inlined, we need to make the copy implied
// by them actually explicit.
// TODO: If we know that the callee never modifies the struct, we can
// remove this copy.
if (CalledFunc->paramHasAttr(ArgNo+1, ParamAttr::ByVal)) {
// by them explicit. However, we don't do this if the callee is readonly
// or readnone, because the copy would be unneeded: the callee doesn't
// modify the struct.
if (CalledFunc->paramHasAttr(ArgNo+1, ParamAttr::ByVal) &&
!CalledFunc->paramHasAttr(0, ParamAttr::ReadOnly) &&
!CalledFunc->paramHasAttr(0, ParamAttr::ReadNone)) {
const Type *AggTy = cast<PointerType>(I->getType())->getElementType();
const Type *VoidPtrTy = PointerType::getUnqual(Type::Int8Ty);