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Add a getUMinFromMismatchedTypes helper function.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73883 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman 2009-06-22 15:03:27 +00:00
parent 66b9f29df2
commit c9759e80f4
2 changed files with 22 additions and 0 deletions
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6
include/llvm/Analysis/ScalarEvolution.h
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@ -553,6 +553,12 @@ namespace llvm {
SCEVHandle getUMaxFromMismatchedTypes(const SCEVHandle &LHS,
const SCEVHandle &RHS);
/// getUMinFromMismatchedTypes - Promote the operands to the wider of
/// the types using zero-extension, and then perform a umin operation
/// with them.
SCEVHandle getUMinFromMismatchedTypes(const SCEVHandle &LHS,
const SCEVHandle &RHS);
/// hasSCEV - Return true if the SCEV for this value has already been
/// computed.
bool hasSCEV(Value *V) const;

16
lib/Analysis/ScalarEvolution.cpp
View File

@ -2156,6 +2156,22 @@ SCEVHandle ScalarEvolution::getUMaxFromMismatchedTypes(const SCEVHandle &LHS,
return getUMaxExpr(PromotedLHS, PromotedRHS);
}
/// getUMinFromMismatchedTypes - Promote the operands to the wider of
/// the types using zero-extension, and then perform a umin operation
/// with them.
SCEVHandle ScalarEvolution::getUMinFromMismatchedTypes(const SCEVHandle &LHS,
const SCEVHandle &RHS) {
SCEVHandle PromotedLHS = LHS;
SCEVHandle PromotedRHS = RHS;
if (getTypeSizeInBits(LHS->getType()) > getTypeSizeInBits(RHS->getType()))
PromotedRHS = getZeroExtendExpr(RHS, LHS->getType());
else
PromotedLHS = getNoopOrZeroExtend(LHS, RHS->getType());
return getUMinExpr(PromotedLHS, PromotedRHS);
}
/// ReplaceSymbolicValueWithConcrete - This looks up the computed SCEV value for
/// the specified instruction and replaces any references to the symbolic value
/// SymName with the specified value. This is used during PHI resolution.