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Diffstat (limited to 'include/llvm/Analysis/ValueTracking.h')
| -rw-r--r-- | include/llvm/Analysis/ValueTracking.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/llvm/Analysis/ValueTracking.h b/include/llvm/Analysis/ValueTracking.h index 7b6026fea0..b9634f04ec 100644 --- a/include/llvm/Analysis/ValueTracking.h +++ b/include/llvm/Analysis/ValueTracking.h @@ -77,6 +77,25 @@ namespace llvm { /// bool CannotBeNegativeZero(const Value *V, unsigned Depth = 0); + /// DecomposeGEPExpression - If V is a symbolic pointer expression, decompose + /// it into a base pointer with a constant offset and a number of scaled + /// symbolic offsets. + /// + /// The scaled symbolic offsets (represented by pairs of a Value* and a scale + /// in the VarIndices vector) are Value*'s that are known to be scaled by the + /// specified amount, but which may have other unrepresented high bits. As + /// such, the gep cannot necessarily be reconstructed from its decomposed + /// form. + /// + /// When TargetData is around, this function is capable of analyzing + /// everything that Value::getUnderlyingObject() can look through. When not, + /// it just looks through pointer casts. + /// + const Value *DecomposeGEPExpression(const Value *V, int64_t &BaseOffs, + SmallVectorImpl<std::pair<const Value*, int64_t> > &VarIndices, + const TargetData *TD); + + /// FindInsertedValue - Given an aggregrate and an sequence of indices, see if /// the scalar value indexed is already around as a register, for example if |