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Code cleanups. getSCEVAtScope no longer uses SCEVCouldNotCompute.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73401 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-06-15 18:38:59 +00:00
parent f88f21c5d4
commit 743e41eae1
1 changed files with 9 additions and 9 deletions
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18
lib/Analysis/IVUsers.cpp
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@ -120,9 +120,9 @@ static bool getSCEVStartAndStride(const SCEVHandle &SH, Loop *L, Loop *UseLoop,
// Use getSCEVAtScope to attempt to simplify other loops out of
// the picture.
SCEVHandle AddRecStart = AddRec->getStart();
SCEVHandle BetterAddRecStart = SE->getSCEVAtScope(AddRecStart, UseLoop);
if (!isa<SCEVCouldNotCompute>(BetterAddRecStart))
AddRecStart = BetterAddRecStart;
AddRecStart = SE->getSCEVAtScope(AddRecStart, UseLoop);
SCEVHandle AddRecStride = AddRec->getStepRecurrence(*SE);
AddRecStride = SE->getSCEVAtScope(AddRecStride, UseLoop);
// FIXME: If Start contains an SCEVAddRecExpr from a different loop, other
// than an outer loop of the current loop, reject it. LSR has no concept of
@ -136,18 +136,18 @@ static bool getSCEVStartAndStride(const SCEVHandle &SH, Loop *L, Loop *UseLoop,
Start = SE->getAddExpr(Start, AddRecStart);
if (!isa<SCEVConstant>(AddRec->getStepRecurrence(*SE))) {
// If stride is an instruction, make sure it dominates the loop preheader.
// Otherwise we could end up with a use before def situation.
// If stride is an instruction, make sure it dominates the loop preheader.
// Otherwise we could end up with a use before def situation.
if (!isa<SCEVConstant>(AddRecStride)) {
BasicBlock *Preheader = L->getLoopPreheader();
if (!AddRec->getStepRecurrence(*SE)->dominates(Preheader, DT))
if (!AddRecStride->dominates(Preheader, DT))
return false;
DOUT << "[" << L->getHeader()->getName()
<< "] Variable stride: " << *AddRec << "\n";
}
Stride = AddRec->getStepRecurrence(*SE);
Stride = AddRecStride;
isSigned = isSExt;
return true;
}
@ -326,7 +326,7 @@ SCEVHandle IVUsers::getReplacementExpr(const IVStrideUse &U) const {
// Evaluate the expression out of the loop, if possible.
if (!L->contains(U.getUser()->getParent())) {
SCEVHandle ExitVal = SE->getSCEVAtScope(RetVal, L->getParentLoop());
if (!isa<SCEVCouldNotCompute>(ExitVal) && ExitVal->isLoopInvariant(L))
if (ExitVal->isLoopInvariant(L))
RetVal = ExitVal;
}
// Promote the result to the type of the use.