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GVN-hoist: move check before mutating the IR

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llvm-svn: 276368
This commit is contained in:
Sebastian Pop 2016-07-22 00:07:01 +00:00
parent fbccf1a76d
commit cbfc347897
1 changed files with 8 additions and 6 deletions
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14
lib/Transforms/Scalar/GVNHoist.cpp
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@ -585,9 +585,14 @@ public:
Gep = dyn_cast<GetElementPtrInst>(St->getPointerOperand());
Val = dyn_cast<Instruction>(St->getValueOperand());
// Check that the stored value is available.
if (Val && !isa<GetElementPtrInst>(Val) &&
!DT->dominates(Val->getParent(), HoistPt))
return false;
if (Val) {
if (isa<GetElementPtrInst>(Val)) {
// Check whether we can compute the GEP at HoistPt.
if (!allOperandsAvailable(Val, HoistPt))
return false;
} else if (!DT->dominates(Val->getParent(), HoistPt))
return false;
}
}
// Check whether we can compute the Gep at HoistPt.
@ -613,9 +618,6 @@ public:
// Also copy Val when it is a GEP.
if (Val && isa<GetElementPtrInst>(Val)) {
// Check whether we can compute the GEP at HoistPt.
if (!allOperandsAvailable(Val, HoistPt))
return false;
Instruction *ClonedVal = Val->clone();
ClonedVal->insertBefore(HoistPt->getTerminator());
// Conservatively discard any optimization hints, they may differ on the