ed37bdcc3e
Refactor how `func.func` discardable attributes are handled in the Func-to-LLVM conversion. Instead of ad hoc checks for linkage and readnone followed by a simple filter, the pass now generically processes inherent attributes from LLVMFuncOp. Attributes that correspond to inherent `llvm.func` ODS names can be attached as `llvm.<name>` on `func.func` and are stripped to `<name>` when building `LLVM::LLVMFuncOp`, so LLVM-specific knobs stay namespaced on the source op but land on the right inherent slots on `llvm.func`. Other discardable attributes continue to be propagated as-is. Fixes #175959 Fixes #181464 Assisted-by: CLion code completion, GPT 5.3-Codex --------- Co-authored-by: Mehdi Amini <joker.eph@gmail.com>
107 lines
3.9 KiB
C++
107 lines
3.9 KiB
C++
//===- VScaleAttr.cpp -------------------------------------------------===//
|
|
//
|
|
// 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
/// \file
|
|
/// This pass adds a `vscale_range` attribute to function definitions.
|
|
/// The attribute is used for scalable vector operations on Arm processors
|
|
/// and should only be run on processors that support this feature. [It is
|
|
/// likely harmless to run it on something else, but it is also not valuable].
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "flang/Common/ISO_Fortran_binding_wrapper.h"
|
|
#include "flang/Optimizer/Builder/BoxValue.h"
|
|
#include "flang/Optimizer/Builder/FIRBuilder.h"
|
|
#include "flang/Optimizer/Builder/Runtime/Inquiry.h"
|
|
#include "flang/Optimizer/Dialect/FIRDialect.h"
|
|
#include "flang/Optimizer/Dialect/FIROps.h"
|
|
#include "flang/Optimizer/Dialect/FIRType.h"
|
|
#include "flang/Optimizer/Dialect/Support/FIRContext.h"
|
|
#include "flang/Optimizer/Dialect/Support/KindMapping.h"
|
|
#include "flang/Optimizer/Transforms/Passes.h"
|
|
#include "mlir/Dialect/LLVMIR/LLVMAttrs.h"
|
|
#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
|
|
#include "mlir/IR/Diagnostics.h"
|
|
#include "mlir/IR/Matchers.h"
|
|
#include "mlir/IR/TypeUtilities.h"
|
|
#include "mlir/Pass/Pass.h"
|
|
#include "mlir/Transforms/DialectConversion.h"
|
|
#include "mlir/Transforms/GreedyPatternRewriteDriver.h"
|
|
#include "mlir/Transforms/RegionUtils.h"
|
|
#include "llvm/ADT/Twine.h"
|
|
#include "llvm/Support/Debug.h"
|
|
#include "llvm/Support/MathExtras.h"
|
|
#include "llvm/Support/raw_ostream.h"
|
|
|
|
#include <algorithm>
|
|
#include <string>
|
|
|
|
namespace fir {
|
|
#define GEN_PASS_DEF_VSCALEATTR
|
|
#include "flang/Optimizer/Transforms/Passes.h.inc"
|
|
} // namespace fir
|
|
|
|
#define DEBUG_TYPE "vscale-attr"
|
|
|
|
namespace {
|
|
|
|
/// See FunctionAttr.cpp: `llvm.func` properties on `func.func` need the `llvm.`
|
|
/// prefix for convert-func-to-llvm.
|
|
static mlir::StringAttr getLlvmFuncPropertyAttrName(mlir::MLIRContext *ctx,
|
|
mlir::StringAttr baseName) {
|
|
return mlir::StringAttr::get(ctx, llvm::Twine("llvm.") + baseName.getValue());
|
|
}
|
|
|
|
class VScaleAttrPass : public fir::impl::VScaleAttrBase<VScaleAttrPass> {
|
|
public:
|
|
VScaleAttrPass(const fir::VScaleAttrOptions &options) {
|
|
vscaleMin = options.vscaleMin;
|
|
vscaleMax = options.vscaleMax;
|
|
}
|
|
VScaleAttrPass() {}
|
|
void runOnOperation() override;
|
|
};
|
|
|
|
} // namespace
|
|
|
|
void VScaleAttrPass::runOnOperation() {
|
|
LLVM_DEBUG(llvm::dbgs() << "=== Begin " DEBUG_TYPE " ===\n");
|
|
mlir::func::FuncOp func = getOperation();
|
|
|
|
LLVM_DEBUG(llvm::dbgs() << "Func-name:" << func.getSymName() << "\n");
|
|
|
|
if (!llvm::isPowerOf2_32(vscaleMin)) {
|
|
func->emitError(
|
|
"VScaleAttr: vscaleMin has to be a power-of-two greater than 0\n");
|
|
return signalPassFailure();
|
|
}
|
|
|
|
if (vscaleMax != 0 &&
|
|
(!llvm::isPowerOf2_32(vscaleMax) || (vscaleMin > vscaleMax))) {
|
|
func->emitError("VScaleAttr: vscaleMax has to be a power-of-two "
|
|
"greater-than-or-equal to vscaleMin or 0 to signify "
|
|
"an unbounded maximum\n");
|
|
return signalPassFailure();
|
|
}
|
|
|
|
mlir::MLIRContext *context = &getContext();
|
|
auto llvmFuncOpName =
|
|
mlir::OperationName(mlir::LLVM::LLVMFuncOp::getOperationName(), context);
|
|
|
|
auto intTy = mlir::IntegerType::get(context, 32);
|
|
|
|
func->setAttr(getLlvmFuncPropertyAttrName(
|
|
context, mlir::LLVM::LLVMFuncOp::getVscaleRangeAttrName(
|
|
llvmFuncOpName)),
|
|
mlir::LLVM::VScaleRangeAttr::get(
|
|
context, mlir::IntegerAttr::get(intTy, vscaleMin),
|
|
mlir::IntegerAttr::get(intTy, vscaleMax)));
|
|
|
|
LLVM_DEBUG(llvm::dbgs() << "=== End " DEBUG_TYPE " ===\n");
|
|
}
|