[clang][Interp] Implement bitwise operations for IntegralAP (#71807)

Author: tbaederr

clang/lib/AST/Interp/IntegralAP.h

@@ -218,21 +218,19 @@ template <bool Signed> class IntegralAP final {
 
   static bool bitAnd(IntegralAP A, IntegralAP B, unsigned OpBits,
                      IntegralAP *R) {
-    // FIXME: Implement.
-    assert(false);
+    *R = IntegralAP(A.V & B.V);
     return false;
   }
 
   static bool bitOr(IntegralAP A, IntegralAP B, unsigned OpBits,
                     IntegralAP *R) {
-    assert(false);
+    *R = IntegralAP(A.V | B.V);
     return false;
   }
 
   static bool bitXor(IntegralAP A, IntegralAP B, unsigned OpBits,
                      IntegralAP *R) {
-    // FIXME: Implement.
-    assert(false);
+    *R = IntegralAP(A.V ^ B.V);
     return false;
   }
 

clang/test/AST/Interp/intap.cpp

@@ -172,4 +172,16 @@ namespace Bitfields {
                         // expected-warning {{changes value from 100 to 0}}
 }
 
+namespace BitOps {
+  constexpr unsigned __int128 UZero = 0;
+  constexpr unsigned __int128 Max = ~UZero;
+  static_assert(Max == ~0, "");
+  static_assert((Max & 0) == 0, "");
+  static_assert((UZero | 0) == 0, "");
+  static_assert((Max ^ Max) == 0, "");
+  static_assert((Max & 1) == 1, "");
+  static_assert((UZero | 1) == 1, "");
+  static_assert((Max ^ UZero) == Max, "");
+}
+
 #endif