================ @@ -0,0 +1,152 @@ +//===- X86.cpp - Emit CIR for x86-64 -------------------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "../TargetLoweringInfo.h" +#include "clang/CIR/Dialect/Builder/CIRBaseBuilder.h" +#include "clang/CIR/Dialect/IR/CIRDataLayout.h" +#include "clang/CIR/Dialect/IR/CIRDialect.h" +#include "clang/CIR/Dialect/IR/CIROpsEnums.h" +#include "clang/CIR/Dialect/IR/CIRTypes.h" + +#include <cstdint> + +namespace cir { + +namespace { + +/// x86-64 System V target hooks. +class X86_64TargetLoweringInfo : public TargetLoweringInfo { +public: + mlir::Value + lowerAggregateVAArg(CIRBaseBuilderTy &builder, cir::VAArgOp op, + mlir::Value valist, + const cir::CIRDataLayout &dataLayout) const override; +}; + +// Expand a `cir.va_arg` that produces an aggregate into the x86-64 System V +// register-save-area dance. The generic lowering of `cir.va_arg` emits an +// `llvm.va_arg` instruction, which Selection-DAG cannot handle for aggregate +// types (it crashes with "Unknown type!"). Classic CodeGen open-codes this +// expansion at the AST level; CIR defers it to the CXXABILowering pass so the +// LLVM lowering only ever sees a fully expanded form. +// +// Only aggregates whose eightbytes are all of INTEGER class (integers, ---------------- adams381 wrote:
Agreed, belongs in CallConvLowering with the classifier, not here. Closing; I'll redo it on the callconv stack. https://github.com/llvm/llvm-project/pull/201175 _______________________________________________ cfe-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
