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[SCEV] Use APInt's uint64_t operations instead of creating a temporary APInt to hold 1.

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llvm-svn: 302333
This commit is contained in:
Craig Topper
2017-05-06 05:15:11 +00:00
parent 8f26b7945e
commit c97fdb846e
1 changed files with 2 additions and 3 deletions
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5
llvm/lib/Analysis/ScalarEvolution.cpp
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@@ -9306,9 +9306,8 @@ const SCEV *SCEVAddRecExpr::getNumIterationsInRange(const ConstantRange &Range,
// the upper value of the range must be the first possible exit value.
// If A is negative then the lower of the range is the last possible loop
// value. Also note that we already checked for a full range.
APInt One(BitWidth,1);
APInt A = cast<SCEVConstant>(getOperand(1))->getAPInt();
APInt End = A.sge(One) ? (Range.getUpper() - One) : Range.getLower();
APInt End = A.sge(1) ? (Range.getUpper() - 1) : Range.getLower();
// The exit value should be (End+A)/A.
APInt ExitVal = (End + A).udiv(A);
@@ -9324,7 +9323,7 @@ const SCEV *SCEVAddRecExpr::getNumIterationsInRange(const ConstantRange &Range,
// Ensure that the previous value is in the range. This is a sanity check.
assert(Range.contains(
EvaluateConstantChrecAtConstant(this,
ConstantInt::get(SE.getContext(), ExitVal - One), SE)->getValue()) &&
ConstantInt::get(SE.getContext(), ExitVal - 1), SE)->getValue()) &&
"Linear scev computation is off in a bad way!");
return SE.getConstant(ExitValue);
} else if (isQuadratic()) {