1 | //===- ControlFlowToSPIRV.cpp - ControlFlow to SPIR-V Patterns ------------===// |
2 | // |
3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
4 | // See https://llvm.org/LICENSE.txt for license information. |
5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
6 | // |
7 | //===----------------------------------------------------------------------===// |
8 | // |
9 | // This file implements patterns to convert standard dialect to SPIR-V dialect. |
10 | // |
11 | //===----------------------------------------------------------------------===// |
12 | |
13 | #include "mlir/Conversion/ControlFlowToSPIRV/ControlFlowToSPIRV.h" |
14 | #include "../SPIRVCommon/Pattern.h" |
15 | #include "mlir/Dialect/ControlFlow/IR/ControlFlowOps.h" |
16 | #include "mlir/Dialect/SPIRV/IR/SPIRVDialect.h" |
17 | #include "mlir/Dialect/SPIRV/IR/SPIRVOps.h" |
18 | #include "mlir/Dialect/SPIRV/Transforms/SPIRVConversion.h" |
19 | #include "mlir/Dialect/SPIRV/Utils/LayoutUtils.h" |
20 | #include "mlir/IR/AffineMap.h" |
21 | #include "mlir/IR/PatternMatch.h" |
22 | #include "mlir/Transforms/DialectConversion.h" |
23 | #include "llvm/Support/Debug.h" |
24 | #include "llvm/Support/FormatVariadic.h" |
25 | |
26 | #define DEBUG_TYPE "cf-to-spirv-pattern" |
27 | |
28 | using namespace mlir; |
29 | |
30 | /// Legailze target block arguments. |
31 | static LogicalResult legalizeBlockArguments(Block &block, Operation *op, |
32 | PatternRewriter &rewriter, |
33 | const TypeConverter &converter) { |
34 | auto builder = OpBuilder::atBlockBegin(block: &block); |
35 | for (unsigned i = 0; i < block.getNumArguments(); ++i) { |
36 | BlockArgument arg = block.getArgument(i); |
37 | if (converter.isLegal(type: arg.getType())) |
38 | continue; |
39 | Type ty = arg.getType(); |
40 | Type newTy = converter.convertType(t: ty); |
41 | if (!newTy) { |
42 | return rewriter.notifyMatchFailure( |
43 | arg&: op, msg: llvm::formatv(Fmt: "failed to legalize type for argument {0})" , Vals&: arg)); |
44 | } |
45 | unsigned argNum = arg.getArgNumber(); |
46 | Location loc = arg.getLoc(); |
47 | Value newArg = block.insertArgument(index: argNum, type: newTy, loc); |
48 | Value convertedValue = converter.materializeSourceConversion( |
49 | builder, loc: op->getLoc(), resultType: ty, inputs: newArg); |
50 | if (!convertedValue) { |
51 | return rewriter.notifyMatchFailure( |
52 | arg&: op, msg: llvm::formatv(Fmt: "failed to cast new argument {0} to type {1})" , |
53 | Vals&: newArg, Vals&: ty)); |
54 | } |
55 | arg.replaceAllUsesWith(newValue: convertedValue); |
56 | block.eraseArgument(index: argNum + 1); |
57 | } |
58 | return success(); |
59 | } |
60 | |
61 | //===----------------------------------------------------------------------===// |
62 | // Operation conversion |
63 | //===----------------------------------------------------------------------===// |
64 | |
65 | namespace { |
66 | /// Converts cf.br to spirv.Branch. |
67 | struct BranchOpPattern final : OpConversionPattern<cf::BranchOp> { |
68 | using OpConversionPattern::OpConversionPattern; |
69 | |
70 | LogicalResult |
71 | matchAndRewrite(cf::BranchOp op, OpAdaptor adaptor, |
72 | ConversionPatternRewriter &rewriter) const override { |
73 | if (failed(legalizeBlockArguments(*op.getDest(), op, rewriter, |
74 | *getTypeConverter()))) |
75 | return failure(); |
76 | |
77 | rewriter.replaceOpWithNewOp<spirv::BranchOp>(op, op.getDest(), |
78 | adaptor.getDestOperands()); |
79 | return success(); |
80 | } |
81 | }; |
82 | |
83 | /// Converts cf.cond_br to spirv.BranchConditional. |
84 | struct CondBranchOpPattern final : OpConversionPattern<cf::CondBranchOp> { |
85 | using OpConversionPattern::OpConversionPattern; |
86 | |
87 | LogicalResult |
88 | matchAndRewrite(cf::CondBranchOp op, OpAdaptor adaptor, |
89 | ConversionPatternRewriter &rewriter) const override { |
90 | if (failed(legalizeBlockArguments(*op.getTrueDest(), op, rewriter, |
91 | *getTypeConverter()))) |
92 | return failure(); |
93 | |
94 | if (failed(legalizeBlockArguments(*op.getFalseDest(), op, rewriter, |
95 | *getTypeConverter()))) |
96 | return failure(); |
97 | |
98 | rewriter.replaceOpWithNewOp<spirv::BranchConditionalOp>( |
99 | op, adaptor.getCondition(), op.getTrueDest(), |
100 | adaptor.getTrueDestOperands(), op.getFalseDest(), |
101 | adaptor.getFalseDestOperands()); |
102 | return success(); |
103 | } |
104 | }; |
105 | } // namespace |
106 | |
107 | //===----------------------------------------------------------------------===// |
108 | // Pattern population |
109 | //===----------------------------------------------------------------------===// |
110 | |
111 | void mlir::cf::populateControlFlowToSPIRVPatterns( |
112 | const SPIRVTypeConverter &typeConverter, RewritePatternSet &patterns) { |
113 | MLIRContext *context = patterns.getContext(); |
114 | |
115 | patterns.add<BranchOpPattern, CondBranchOpPattern>(arg: typeConverter, args&: context); |
116 | } |
117 | |