00ad9ecc1c
This patch introduces a new pass, SPIRVCBufferAccess, which is responsible for translating accesses to HLSL constant buffer (cbuffer) global variables into accesses to the proper SPIR-V resource. The pass operates by: 1. Identifying all cbuffers via the `!hlsl.cbs` metadata. 2. Replacing all uses of cbuffer member global variables with `llvm.spv.resource.getpointer` intrinsics. 3. Cleaning up the original global variables and metadata. This approach allows subsequent passes, like SPIRVEmitIntrinsics, to correctly fold GEPs into a single OpAccessChain instruction. The patch also includes a comprehensive set of lit tests to cover various scenarios: - Basic cbuffer access direct load and GEPs. - Unused and partially unused cbuffers. This implements the SPIR-V version of https://github.com/llvm/wg-hlsl/blob/main/proposals/0016-constant-buffers.md#lowering-to-buffer-load-intrinsics.
23 lines
665 B
C++
23 lines
665 B
C++
//===- SPIRVCBufferAccess.h - Translate CBuffer Loads ----------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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#ifndef LLVM_LIB_TARGET_SPIRV_SPIRVCBUFFERACCESS_H_
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#define LLVM_LIB_TARGET_SPIRV_SPIRVCBUFFERACCESS_H_
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#include "llvm/IR/PassManager.h"
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namespace llvm {
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class SPIRVCBufferAccess : public PassInfoMixin<SPIRVCBufferAccess> {
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public:
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PreservedAnalyses run(Module &M, ModuleAnalysisManager &AM);
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};
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} // namespace llvm
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#endif // LLVM_LIB_TARGET_SPIRV_SPIRVCBUFFERACCESS_H_
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