move gep decomposition out of ValueTracking into BasicAA. The form of

decomposition that it is doing is very basicaa specific and is only used
by basicaa.

Now with less tree breakingness.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111433 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2010-08-18 22:07:29 +00:00
parent d77e5a8176
commit 30963fbe8f
3 changed files with 229 additions and 242 deletions

View File

@@ -77,25 +77,6 @@ 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