Add completely hokey binary-and and binary-or operations to ConstantRange and
teach LazyValueInfo to use them.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113196 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Support/ConstantRange.cpp b/lib/Support/ConstantRange.cpp
index defb818..c89ec9a 100644
--- a/lib/Support/ConstantRange.cpp
+++ b/lib/Support/ConstantRange.cpp
@@ -608,6 +608,32 @@
}
ConstantRange
+ConstantRange::binaryAnd(const ConstantRange &Other) const {
+ if (isEmptySet() || Other.isEmptySet())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/false);
+
+ // TODO: replace this with something less conservative
+
+ APInt umin = APIntOps::umin(Other.getUnsignedMax(), getUnsignedMax());
+ if (umin.isAllOnesValue())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
+ return ConstantRange(APInt::getNullValue(getBitWidth()), umin + 1);
+}
+
+ConstantRange
+ConstantRange::binaryOr(const ConstantRange &Other) const {
+ if (isEmptySet() || Other.isEmptySet())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/false);
+
+ // TODO: replace this with something less conservative
+
+ APInt umax = APIntOps::umax(getUnsignedMin(), Other.getUnsignedMin());
+ if (umax.isMinValue())
+ return ConstantRange(getBitWidth(), /*isFullSet=*/true);
+ return ConstantRange(umax, APInt::getNullValue(getBitWidth()));
+}
+
+ConstantRange
ConstantRange::shl(const ConstantRange &Other) const {
if (isEmptySet() || Other.isEmptySet())
return ConstantRange(getBitWidth(), /*isFullSet=*/false);