1//===- VScaleAttr.cpp -------------------------------------------------===//
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//===----------------------------------------------------------------------===//
10/// \file
11/// This pass adds a `vscale_range` attribute to function definitions.
12/// The attribute is used for scalable vector operations on Arm processors
13/// and should only be run on processors that support this feature. [It is
14/// likely harmless to run it on something else, but it is also not valuable].
15//===----------------------------------------------------------------------===//
16
17#include "flang/Common/ISO_Fortran_binding_wrapper.h"
18#include "flang/Optimizer/Builder/BoxValue.h"
19#include "flang/Optimizer/Builder/FIRBuilder.h"
20#include "flang/Optimizer/Builder/Runtime/Inquiry.h"
21#include "flang/Optimizer/Dialect/FIRDialect.h"
22#include "flang/Optimizer/Dialect/FIROps.h"
23#include "flang/Optimizer/Dialect/FIRType.h"
24#include "flang/Optimizer/Dialect/Support/FIRContext.h"
25#include "flang/Optimizer/Dialect/Support/KindMapping.h"
26#include "flang/Optimizer/Transforms/Passes.h"
27#include "mlir/Dialect/LLVMIR/LLVMAttrs.h"
28#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
29#include "mlir/IR/Matchers.h"
30#include "mlir/IR/TypeUtilities.h"
31#include "mlir/Pass/Pass.h"
32#include "mlir/Transforms/DialectConversion.h"
33#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
34#include "mlir/Transforms/RegionUtils.h"
35#include "llvm/Support/Debug.h"
36#include "llvm/Support/raw_ostream.h"
37
38#include <algorithm>
39
40namespace fir {
41#define GEN_PASS_DEF_VSCALEATTR
42#include "flang/Optimizer/Transforms/Passes.h.inc"
43} // namespace fir
44
45#define DEBUG_TYPE "vscale-attr"
46
47namespace {
48
49class VScaleAttrPass : public fir::impl::VScaleAttrBase<VScaleAttrPass> {
50public:
51 VScaleAttrPass(const fir::VScaleAttrOptions &options) {
52 vscaleRange = options.vscaleRange;
53 }
54 VScaleAttrPass() {}
55 void runOnOperation() override;
56};
57
58} // namespace
59
60void VScaleAttrPass::runOnOperation() {
61 LLVM_DEBUG(llvm::dbgs() << "=== Begin " DEBUG_TYPE " ===\n");
62 mlir::func::FuncOp func = getOperation();
63
64 LLVM_DEBUG(llvm::dbgs() << "Func-name:" << func.getSymName() << "\n");
65
66 auto context = &getContext();
67
68 auto intTy = mlir::IntegerType::get(context, 32);
69
70 assert(vscaleRange.first && "VScaleRange minimum should be non-zero");
71
72 func->setAttr("vscale_range",
73 mlir::LLVM::VScaleRangeAttr::get(
74 context, mlir::IntegerAttr::get(intTy, vscaleRange.first),
75 mlir::IntegerAttr::get(intTy, vscaleRange.second)));
76
77 LLVM_DEBUG(llvm::dbgs() << "=== End " DEBUG_TYPE " ===\n");
78}
79

source code of flang/lib/Optimizer/Transforms/VScaleAttr.cpp