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Small cleanup. Use APInt::getHighBitsSet method instead of shift left.

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"setcc" -> "icmp op" in comments. No functionality change.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44249 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky 2007-11-20 08:44:50 +00:00
parent cf96db2c1d
commit 6e801dc6c0
1 changed files with 4 additions and 5 deletions
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9
lib/Analysis/ScalarEvolution.cpp
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@ -1207,7 +1207,7 @@ namespace {
SCEVHandle ComputeIterationCount(const Loop *L); SCEVHandle ComputeIterationCount(const Loop *L);
/// ComputeLoadConstantCompareIterationCount - Given an exit condition of /// ComputeLoadConstantCompareIterationCount - Given an exit condition of
/// 'setcc load X, cst', try to see if we can compute the trip count. /// 'icmp op load X, cst', try to see if we can compute the trip count.
SCEVHandle ComputeLoadConstantCompareIterationCount(LoadInst *LI, SCEVHandle ComputeLoadConstantCompareIterationCount(LoadInst *LI,
Constant *RHS, Constant *RHS,
const Loop *L, const Loop *L,
@ -1418,13 +1418,12 @@ static APInt GetConstantFactor(SCEVHandle S) {
if (!V.isMinValue()) if (!V.isMinValue())
return V; return V;
else // Zero is a multiple of everything. else // Zero is a multiple of everything.
return APInt(C->getBitWidth(), 1).shl(C->getBitWidth()-1); return APInt::getHighBitsSet(C->getBitWidth(), 1);
} }
if (SCEVTruncateExpr *T = dyn_cast<SCEVTruncateExpr>(S)) { if (SCEVTruncateExpr *T = dyn_cast<SCEVTruncateExpr>(S))
return GetConstantFactor(T->getOperand()).trunc( return GetConstantFactor(T->getOperand()).trunc(
cast<IntegerType>(T->getType())->getBitWidth()); cast<IntegerType>(T->getType())->getBitWidth());
}
if (SCEVZeroExtendExpr *E = dyn_cast<SCEVZeroExtendExpr>(S)) if (SCEVZeroExtendExpr *E = dyn_cast<SCEVZeroExtendExpr>(S))
return GetConstantFactor(E->getOperand()).zext( return GetConstantFactor(E->getOperand()).zext(
cast<IntegerType>(E->getType())->getBitWidth()); cast<IntegerType>(E->getType())->getBitWidth());
@ -1787,7 +1786,7 @@ GetAddressedElementFromGlobal(GlobalVariable *GV,
} }
/// ComputeLoadConstantCompareIterationCount - Given an exit condition of /// ComputeLoadConstantCompareIterationCount - Given an exit condition of
/// 'setcc load X, cst', try to se if we can compute the trip count. /// 'icmp op load X, cst', try to se if we can compute the trip count.
SCEVHandle ScalarEvolutionsImpl:: SCEVHandle ScalarEvolutionsImpl::
ComputeLoadConstantCompareIterationCount(LoadInst *LI, Constant *RHS, ComputeLoadConstantCompareIterationCount(LoadInst *LI, Constant *RHS,
const Loop *L, const Loop *L,