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Fix InstCombine/2004-01-13-InstCombineInvokePHI.ll, which also fixes lots

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of C++ programs in Shootout-C++, including lists1 and moments, etc


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10845 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-01-14 06:06:08 +00:00
parent 34562bab04
commit f78616b339
1 changed files with 20 additions and 4 deletions
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24
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -1821,10 +1821,26 @@ bool InstCombiner::transformConstExprCastCall(CallSite CS) {
const FunctionType *FT = Callee->getFunctionType();
const Type *OldRetTy = Caller->getType();
if (Callee->isExternal() &&
!OldRetTy->isLosslesslyConvertibleTo(FT->getReturnType()) &&
!Caller->use_empty())
return false; // Cannot transform this return value...
// Check to see if we are changing the return type...
if (OldRetTy != FT->getReturnType()) {
if (Callee->isExternal() &&
!OldRetTy->isLosslesslyConvertibleTo(FT->getReturnType()) &&
!Caller->use_empty())
return false; // Cannot transform this return value...
// If the callsite is an invoke instruction, and the return value is used by
// a PHI node in a successor, we cannot change the return type of the call
// because there is no place to put the cast instruction (without breaking
// the critical edge). Bail out in this case.
if (!Caller->use_empty())
if (InvokeInst *II = dyn_cast<InvokeInst>(Caller))
for (Value::use_iterator UI = II->use_begin(), E = II->use_end();
UI != E; ++UI)
if (PHINode *PN = dyn_cast<PHINode>(*UI))
if (PN->getParent() == II->getNormalDest() ||
PN->getParent() == II->getExceptionalDest())
return false;
}
unsigned NumActualArgs = unsigned(CS.arg_end()-CS.arg_begin());
unsigned NumCommonArgs = std::min(FT->getNumParams(), NumActualArgs);