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LSR: Fix the parameters used to compute the scaling factor cost.

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Prior to this change, the considered addressing modes may be invalid since the
maximum and minimum offsets were not taking into account.
This was causing an assertion failure.

The added test case exercices that behavior.

<rdar://problem/14199725> Assertion failed: (CurScaleCost >= 0 && "Legal
addressing mode has an illegal cost!")


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@184341 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Quentin Colombet
2013-06-19 19:59:41 +00:00
parent ae5758bac7
commit 5a2fb058d3
2 changed files with 81 additions and 5 deletions
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18
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@@ -1417,11 +1417,19 @@ static unsigned getScalingFactorCost(const TargetTransformInfo &TTI,
switch (LU.Kind) {
case LSRUse::Address: {
int CurScaleCost = TTI.getScalingFactorCost(LU.AccessTy, F.BaseGV,
F.BaseOffset, F.HasBaseReg,
F.Scale);
assert(CurScaleCost >= 0 && "Legal addressing mode has an illegal cost!");
return CurScaleCost;
// Check the scaling factor cost with both the min and max offsets.
int ScaleCostMinOffset =
TTI.getScalingFactorCost(LU.AccessTy, F.BaseGV,
F.BaseOffset + LU.MinOffset,
F.HasBaseReg, F.Scale);
int ScaleCostMaxOffset =
TTI.getScalingFactorCost(LU.AccessTy, F.BaseGV,
F.BaseOffset + LU.MaxOffset,
F.HasBaseReg, F.Scale);
assert(ScaleCostMinOffset >= 0 && ScaleCostMaxOffset >= 0 &&
"Legal addressing mode has an illegal cost!");
return std::max(ScaleCostMinOffset, ScaleCostMaxOffset);
}
case LSRUse::ICmpZero:
// ICmpZero BaseReg + -1*ScaleReg => ICmp BaseReg, ScaleReg.