================
@@ -130,17 +389,136 @@ mlir::Value ScalarExprEmitter::VisitCastExpr(CastExpr
*ce) {
QualType destTy = ce->getType();
CastKind kind = ce->getCastKind();
+ // These cases are generally not written to ignore the result of evaluating
+ // their sub-expressions, so we clear this now.
+ [[maybe_unused]] bool ignored = TestAndClearIgnoreResultAssign();
+
switch (kind) {
+ case clang::CK_Dependent:
+ llvm_unreachable("dependent cast kind in CIR gen!");
+ case clang::CK_BuiltinFnToFnPtr:
+ llvm_unreachable("builtin functions are handled elsewhere");
+
+ case CK_CPointerToObjCPointerCast:
+ case CK_BlockPointerToObjCPointerCast:
+ case CK_AnyPointerToBlockPointerCast:
+ case CK_BitCast: {
+ auto src = Visit(const_cast<Expr *>(e));
+ mlir::Type dstTy = convertType(destTy);
+
+ assert(!cir::MissingFeatures::addressSpace());
+
+ if (cgf.sanOpts.has(SanitizerKind::CFIUnrelatedCast))
+ cgf.getCIRGenModule().errorNYI(e->getSourceRange(), "sanitizer support");
+
+ if (cgf.cgm.getCodeGenOpts().StrictVTablePointers)
+ cgf.getCIRGenModule().errorNYI(e->getSourceRange(),
+ "strict vtable pointers");
+
+ // Update heapallocsite metadata when there is an explicit pointer cast.
+ assert(!cir::MissingFeatures::addHeapAllocSiteMetadata());
+
+ // If Src is a fixed vector and Dst is a scalable vector, and both have the
+ // same element type, use the llvm.vector.insert intrinsic to perform the
+ // bitcast.
+ assert(!cir::MissingFeatures::scalableVectors());
+
+ // If Src is a scalable vector and Dst is a fixed vector, and both have the
+ // same element type, use the llvm.vector.extract intrinsic to perform the
+ // bitcast.
+ assert(!cir::MissingFeatures::scalableVectors());
+
+ // Perform VLAT <-> VLST bitcast through memory.
+ // TODO: since the llvm.experimental.vector.{insert,extract} intrinsics
+ // require the element types of the vectors to be the same, we
+ // need to keep this around for bitcasts between VLAT <-> VLST where
+ // the element types of the vectors are not the same, until we figure
+ // out a better way of doing these casts.
+ assert(!cir::MissingFeatures::scalableVectors());
+
+ return cgf.getBuilder().createBitcast(cgf.getLoc(e->getSourceRange()), src,
+ dstTy);
+ }
+
+ case CK_AtomicToNonAtomic:
+ cgf.getCIRGenModule().errorNYI(e->getSourceRange(),
+ "CastExpr: ", ce->getCastKindName());
+ break;
+ case CK_NonAtomicToAtomic:
+ case CK_UserDefinedConversion:
+ return Visit(const_cast<Expr *>(e));
+ case CK_NoOp: {
+ auto v = Visit(const_cast<Expr *>(e));
+ if (v) {
+ // CK_NoOp can model a pointer qualification conversion, which can remove
+ // an array bound and change the IR type.
+ // FIXME: Once pointee types are removed from IR, remove this.
+ auto t = convertType(destTy);
----------------
erichkeane wrote:
not a place we can use `auto`.
https://github.com/llvm/llvm-project/pull/130690
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