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In-Reply-To: <llvm.org/llvm/llvm-project/pull/68...@github.com>
================
@@ -73,6 +73,74 @@ template <class Emitter> class OptionScope final {
} // namespace interp
} // namespace clang
+// This function is constexpr if and only if To, From, and the types of
+// all subobjects of To and From are types T such that...
+// (3.1) - is_union_v<T> is false;
+// (3.2) - is_pointer_v<T> is false;
+// (3.3) - is_member_pointer_v<T> is false;
+// (3.4) - is_volatile_v<T> is false; and
+// (3.5) - T has no non-static data members of reference type
+template <class Emitter>
+bool ByteCodeExprGen<Emitter>::emitBuiltinBitCast(const CastExpr *E) {
+ const Expr *SubExpr = E->getSubExpr();
+ QualType FromType = SubExpr->getType();
+ QualType ToType = E->getType();
+ std::optional<PrimType> ToT = classify(ToType);
+
+ // FIXME: This is wrong. We need to do the bitcast and then
+ // throw away the result, so we still get the diagnostics.
+ if (DiscardResult)
+ return this->discard(SubExpr);
+
+ if (ToType->isNullPtrType()) {
+ if (!this->discard(SubExpr))
+ return false;
+
+ return this->emitNullPtr(E);
+ }
+
+ if (FromType->isNullPtrType() && ToT) {
+ if (!this->discard(SubExpr))
+ return false;
+
+ return visitZeroInitializer(*ToT, ToType, E);
+ }
+ assert(!ToType->isReferenceType());
+
+ // Get a pointer to the value-to-cast on the stack.
+ if (!this->visit(SubExpr))
+ return false;
+
+ if (!ToT || ToT == PT_Ptr) {
+ // Conversion to an array or record type.
+ return this->emitBitCastPtr(E);
+ }
+
+ assert(ToT);
+
+ // Conversion to a primitive type. FromType can be another
+ // primitive type, or a record/array.
+ //
+ // Same thing for floats, but we need the target
+ // semantics here.
----------------
cor3ntin wrote:
Does it actually make sense to have a complete different codepath? we could
have a single function and pass a null pointer in the non floating point case.
https://github.com/llvm/llvm-project/pull/68288
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