1 files changed, 26 insertions, 0 deletions
diff --git a/llvm/lib/Support/KnownBits.cpp b/llvm/lib/Support/KnownBits.cpp
index 8f3f4aa8caea..1ff66d504cbe 100644
--- a/llvm/lib/Support/KnownBits.cpp
+++ b/llvm/lib/Support/KnownBits.cpp
@@ -12,6 +12,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "llvm/Support/KnownBits.h"
+#include <cassert>
 
 using namespace llvm;
 
@@ -81,3 +82,28 @@ KnownBits KnownBits::computeForAddSub(bool Add, bool NSW,
 
   return KnownOut;
 }
+
+KnownBits &KnownBits::operator&=(const KnownBits &RHS) {
+  // Result bit is 0 if either operand bit is 0.
+  Zero |= RHS.Zero;
+  // Result bit is 1 if both operand bits are 1.
+  One &= RHS.One;
+  return *this;
+}
+
+KnownBits &KnownBits::operator|=(const KnownBits &RHS) {
+  // Result bit is 0 if both operand bits are 0.
+  Zero &= RHS.Zero;
+  // Result bit is 1 if either operand bit is 1.
+  One |= RHS.One;
+  return *this;
+}
+
+KnownBits &KnownBits::operator^=(const KnownBits &RHS) {
+  // Result bit is 0 if both operand bits are 0 or both are 1.
+  APInt Z = (Zero & RHS.Zero) | (One & RHS.One);
+  // Result bit is 1 if one operand bit is 0 and the other is 1.
+  One = (Zero & RHS.One) | (One & RHS.Zero);
+  Zero = std::move(Z);
+  return *this;
+}