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//===- LegalizeDataValues.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
//
//===----------------------------------------------------------------------===//
#include "mlir/Dialect/OpenACC/Transforms/Passes.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/Dialect/OpenACC/OpenACC.h"
#include "mlir/IR/Dominance.h"
#include "mlir/Pass/Pass.h"
#include "mlir/Transforms/RegionUtils.h"
#include "llvm/Support/ErrorHandling.h"
namespace mlir {
namespace acc {
#define GEN_PASS_DEF_LEGALIZEDATAVALUESINREGION
#include "mlir/Dialect/OpenACC/Transforms/Passes.h.inc"
} // namespace acc
} // namespace mlir
using namespace mlir;
namespace {
static bool insideAccComputeRegion(mlir::Operation *op) {
mlir::Operation *parent{op->getParentOp()};
while (parent) {
if (isa<ACC_COMPUTE_CONSTRUCT_OPS>(parent)) {
return true;
}
parent = parent->getParentOp();
}
return false;
}
static void collectVars(mlir::ValueRange operands,
llvm::SmallVector<std::pair<Value, Value>> &values,
bool hostToDevice) {
for (auto operand : operands) {
Value var = acc::getVar(operand.getDefiningOp());
Value accVar = acc::getAccVar(operand.getDefiningOp());
if (var && accVar) {
if (hostToDevice)
values.push_back({var, accVar});
else
values.push_back({accVar, var});
}
}
}
template <typename Op>
static void replaceAllUsesInAccComputeRegionsWith(Value orig, Value replacement,
Region &outerRegion) {
for (auto &use : llvm::make_early_inc_range(orig.getUses())) {
if (outerRegion.isAncestor(use.getOwner()->getParentRegion())) {
if constexpr (std::is_same_v<Op, acc::DataOp> ||
std::is_same_v<Op, acc::DeclareOp>) {
// For data construct regions, only replace uses in contained compute
// regions.
if (insideAccComputeRegion(use.getOwner())) {
use.set(replacement);
}
} else {
use.set(replacement);
}
}
}
}
template <typename Op>
static void replaceAllUsesInUnstructuredComputeRegionWith(
Op &op, llvm::SmallVector<std::pair<Value, Value>> &values,
DominanceInfo &domInfo, PostDominanceInfo &postDomInfo) {
SmallVector<Operation *> exitOps;
if constexpr (std::is_same_v<Op, acc::DeclareEnterOp>) {
// For declare enter/exit pairs, collect all exit ops
for (auto *user : op.getToken().getUsers()) {
if (auto declareExit = dyn_cast<acc::DeclareExitOp>(user))
exitOps.push_back(declareExit);
}
if (exitOps.empty())
return;
}
for (auto p : values) {
Value hostVal = std::get<0>(p);
Value deviceVal = std::get<1>(p);
for (auto &use : llvm::make_early_inc_range(hostVal.getUses())) {
Operation *owner = use.getOwner();
// Check It's the case that the acc entry operation dominates the use.
if (!domInfo.dominates(op.getOperation(), owner))
continue;
// Check It's the case that at least one of the acc exit operations
// post-dominates the use
bool hasPostDominatingExit = false;
for (auto *exit : exitOps) {
if (postDomInfo.postDominates(exit, owner)) {
hasPostDominatingExit = true;
break;
}
}
if (!hasPostDominatingExit)
continue;
if (insideAccComputeRegion(owner))
use.set(deviceVal);
}
}
}
template <typename Op>
static void
collectAndReplaceInRegion(Op &op, bool hostToDevice,
DominanceInfo *domInfo = nullptr,
PostDominanceInfo *postDomInfo = nullptr) {
llvm::SmallVector<std::pair<Value, Value>> values;
if constexpr (std::is_same_v<Op, acc::LoopOp>) {
collectVars(op.getReductionOperands(), values, hostToDevice);
collectVars(op.getPrivateOperands(), values, hostToDevice);
} else {
collectVars(op.getDataClauseOperands(), values, hostToDevice);
if constexpr (!std::is_same_v<Op, acc::KernelsOp> &&
!std::is_same_v<Op, acc::DataOp> &&
!std::is_same_v<Op, acc::DeclareOp> &&
!std::is_same_v<Op, acc::HostDataOp> &&
!std::is_same_v<Op, acc::DeclareEnterOp>) {
collectVars(op.getReductionOperands(), values, hostToDevice);
collectVars(op.getPrivateOperands(), values, hostToDevice);
collectVars(op.getFirstprivateOperands(), values, hostToDevice);
}
}
if constexpr (std::is_same_v<Op, acc::DeclareEnterOp>) {
assert(domInfo && postDomInfo &&
"Dominance info required for DeclareEnterOp");
replaceAllUsesInUnstructuredComputeRegionWith<Op>(op, values, *domInfo,
*postDomInfo);
} else {
for (auto p : values) {
replaceAllUsesInAccComputeRegionsWith<Op>(std::get<0>(p), std::get<1>(p),
op.getRegion());
}
}
}
class LegalizeDataValuesInRegion
: public acc::impl::LegalizeDataValuesInRegionBase<
LegalizeDataValuesInRegion> {
public:
using LegalizeDataValuesInRegionBase<
LegalizeDataValuesInRegion>::LegalizeDataValuesInRegionBase;
void runOnOperation() override {
func::FuncOp funcOp = getOperation();
bool replaceHostVsDevice = this->hostToDevice.getValue();
// Initialize dominance info
DominanceInfo domInfo;
PostDominanceInfo postDomInfo;
bool computedDomInfo = false;
funcOp.walk([&](Operation *op) {
if (!isa<ACC_COMPUTE_CONSTRUCT_AND_LOOP_OPS>(*op) &&
!(isa<ACC_DATA_CONSTRUCT_STRUCTURED_OPS>(*op) &&
applyToAccDataConstruct) &&
!isa<acc::DeclareEnterOp>(*op))
return;
if (auto parallelOp = dyn_cast<acc::ParallelOp>(*op)) {
collectAndReplaceInRegion(parallelOp, replaceHostVsDevice);
} else if (auto serialOp = dyn_cast<acc::SerialOp>(*op)) {
collectAndReplaceInRegion(serialOp, replaceHostVsDevice);
} else if (auto kernelsOp = dyn_cast<acc::KernelsOp>(*op)) {
collectAndReplaceInRegion(kernelsOp, replaceHostVsDevice);
} else if (auto loopOp = dyn_cast<acc::LoopOp>(*op)) {
collectAndReplaceInRegion(loopOp, replaceHostVsDevice);
} else if (auto dataOp = dyn_cast<acc::DataOp>(*op)) {
collectAndReplaceInRegion(dataOp, replaceHostVsDevice);
} else if (auto declareOp = dyn_cast<acc::DeclareOp>(*op)) {
collectAndReplaceInRegion(declareOp, replaceHostVsDevice);
} else if (auto hostDataOp = dyn_cast<acc::HostDataOp>(*op)) {
collectAndReplaceInRegion(hostDataOp, replaceHostVsDevice);
} else if (auto declareEnterOp = dyn_cast<acc::DeclareEnterOp>(*op)) {
if (!computedDomInfo) {
domInfo = DominanceInfo(funcOp);
postDomInfo = PostDominanceInfo(funcOp);
computedDomInfo = true;
}
collectAndReplaceInRegion(declareEnterOp, replaceHostVsDevice, &domInfo,
&postDomInfo);
} else {
llvm_unreachable("unsupported acc region op");
}
});
}
};
} // end anonymous namespace
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