Add a getUMinFromMismatchedTypes helper function.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73883 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/ScalarEvolution.cpp b/lib/Analysis/ScalarEvolution.cpp
index 68aa595..d67761c 100644
--- a/lib/Analysis/ScalarEvolution.cpp
+++ b/lib/Analysis/ScalarEvolution.cpp
@@ -2156,6 +2156,22 @@
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.