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Ops.cpp
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//===- PolygeistOps.cpp - BFV dialect ops ---------------*- C++ -*-===//
//
// This file is licensed 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 "polygeist/Ops.h"
#include "mlir/Dialect/Arithmetic/IR/Arithmetic.h"
#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
#include "mlir/Dialect/LLVMIR/LLVMTypes.h"
#include "mlir/IR/AffineExpr.h"
#include "mlir/IR/Builders.h"
#include "mlir/IR/OpImplementation.h"
#include "mlir/Interfaces/SideEffectInterfaces.h"
#include "polygeist/Dialect.h"
#define GET_OP_CLASSES
#include "polygeist/PolygeistOps.cpp.inc"
#include "mlir/Dialect/Affine/IR/AffineOps.h"
#include "mlir/Dialect/Arithmetic/Utils/Utils.h"
#include "mlir/Dialect/Func/IR/FuncOps.h"
#include "mlir/Dialect/MemRef/IR/MemRef.h"
#include "mlir/Dialect/OpenMP/OpenMPDialect.h"
#include "mlir/Dialect/SCF/SCF.h"
#include "mlir/IR/BlockAndValueMapping.h"
using namespace mlir;
using namespace polygeist;
using namespace mlir::arith;
llvm::cl::opt<bool> BarrierOpt("barrier-opt", llvm::cl::init(true),
llvm::cl::desc("Optimize barriers"));
//===----------------------------------------------------------------------===//
// BarrierOp
//===----------------------------------------------------------------------===//
LogicalResult verify(BarrierOp) { return success(); }
/// Collect the memory effects of the given op in 'effects'. Returns 'true' it
/// could extract the effect information from the op, otherwise returns 'false'
/// and conservatively populates the list with all possible effects.
bool collectEffects(Operation *op,
SmallVectorImpl<MemoryEffects::EffectInstance> &effects,
bool ignoreBarriers) {
// Skip over barriers to avoid infinite recursion (those barriers would ask
// this barrier again).
if (ignoreBarriers && isa<BarrierOp>(op))
return true;
// Ignore CacheLoads as they are already guaranteed to not have side effects
// in the context of a parallel op, these only exist while we are in the
// CPUifyPass
if (isa<CacheLoad>(op))
return true;
// Collect effect instances the operation. Note that the implementation of
// getEffects erases all effect instances that have the type other than the
// template parameter so we collect them first in a local buffer and then
// copy.
if (auto iface = dyn_cast<MemoryEffectOpInterface>(op)) {
SmallVector<MemoryEffects::EffectInstance> localEffects;
iface.getEffects(localEffects);
llvm::append_range(effects, localEffects);
return true;
}
if (op->hasTrait<OpTrait::HasRecursiveSideEffects>()) {
for (auto ®ion : op->getRegions()) {
for (auto &block : region) {
for (auto &innerOp : block)
if (!collectEffects(&innerOp, effects, ignoreBarriers))
return false;
}
}
return true;
}
// We need to be conservative here in case the op doesn't have the interface
// and assume it can have any possible effect.
effects.emplace_back(MemoryEffects::Effect::get<MemoryEffects::Read>());
effects.emplace_back(MemoryEffects::Effect::get<MemoryEffects::Write>());
effects.emplace_back(MemoryEffects::Effect::get<MemoryEffects::Allocate>());
effects.emplace_back(MemoryEffects::Effect::get<MemoryEffects::Free>());
return false;
}
// Rethrns if we are non-conservative whether we have filled with all possible
// effects.
bool getEffectsBefore(Operation *op,
SmallVectorImpl<MemoryEffects::EffectInstance> &effects,
bool stopAtBarrier) {
if (op != &op->getBlock()->front())
for (Operation *it = op->getPrevNode(); it != nullptr;
it = it->getPrevNode()) {
if (isa<BarrierOp>(it)) {
if (stopAtBarrier)
return true;
else
continue;
}
if (!collectEffects(it, effects, /* ignoreBarriers */ true))
return false;
}
bool conservative = false;
if (isa<scf::ParallelOp, AffineParallelOp>(op->getParentOp()))
return true;
// As we didn't hit another barrier, we must check the predecessors of this
// operation.
if (!getEffectsBefore(op->getParentOp(), effects, stopAtBarrier))
return false;
// If the parent operation is not guaranteed to execute its (single-block)
// region once, walk the block.
if (!isa<scf::IfOp, AffineIfOp, memref::AllocaScopeOp>(op->getParentOp()))
op->getParentOp()->walk([&](Operation *in) {
if (conservative)
return WalkResult::interrupt();
if (!collectEffects(in, effects, /* ignoreBarriers */ true)) {
conservative = true;
return WalkResult::interrupt();
}
return WalkResult::advance();
});
return !conservative;
}
bool getEffectsAfter(Operation *op,
SmallVectorImpl<MemoryEffects::EffectInstance> &effects,
bool stopAtBarrier) {
if (op != &op->getBlock()->back())
for (Operation *it = op->getNextNode(); it != nullptr;
it = it->getNextNode()) {
if (isa<BarrierOp>(it)) {
if (stopAtBarrier)
return true;
continue;
}
if (!collectEffects(it, effects, /* ignoreBarriers */ true))
return false;
}
bool conservative = false;
if (isa<scf::ParallelOp, AffineParallelOp>(op->getParentOp()))
return true;
// As we didn't hit another barrier, we must check the predecessors of this
// operation.
if (!getEffectsAfter(op->getParentOp(), effects, stopAtBarrier))
return false;
// If the parent operation is not guaranteed to execute its (single-block)
// region once, walk the block.
if (!isa<scf::IfOp, AffineIfOp, memref::AllocaScopeOp>(op->getParentOp()))
op->getParentOp()->walk([&](Operation *in) {
if (conservative)
return WalkResult::interrupt();
if (!collectEffects(in, effects, /* ignoreBarriers */ true)) {
conservative = true;
return WalkResult::interrupt();
}
return WalkResult::advance();
});
return !conservative;
}
void BarrierOp::getEffects(
SmallVectorImpl<MemoryEffects::EffectInstance> &effects) {
// If this doesn't synchronize any values, it has no effects.
if (llvm::all_of(getOperands(), [](Value v) {
IntegerAttr constValue;
return matchPattern(v, m_Constant(&constValue));
}))
return;
Operation *op = getOperation();
if (!getEffectsBefore(op, effects, /*stopAtBarrier*/ true))
return;
if (!getEffectsAfter(op, effects, /*stopAtBarrier*/ true))
return;
}
bool isReadNone(Operation *op);
class BarrierHoist final : public OpRewritePattern<BarrierOp> {
public:
using OpRewritePattern<BarrierOp>::OpRewritePattern;
LogicalResult matchAndRewrite(BarrierOp barrier,
PatternRewriter &rewriter) const override {
if (!BarrierOpt)
return failure();
if (isa<scf::IfOp, AffineIfOp>(barrier->getParentOp())) {
bool below = true;
for (Operation *it = barrier->getNextNode(); it != nullptr;
it = it->getNextNode()) {
if (!isReadNone(it)) {
below = false;
break;
}
}
if (below) {
rewriter.setInsertionPoint(barrier->getParentOp()->getNextNode());
rewriter.create<BarrierOp>(barrier.getLoc(), barrier.getOperands());
rewriter.eraseOp(barrier);
return success();
}
bool above = true;
for (Operation *it = barrier->getPrevNode(); it != nullptr;
it = it->getPrevNode()) {
if (!isReadNone(it)) {
above = false;
break;
}
}
if (above) {
rewriter.setInsertionPoint(barrier->getParentOp());
rewriter.create<BarrierOp>(barrier.getLoc(), barrier.getOperands());
rewriter.eraseOp(barrier);
return success();
}
}
// Move barrier into after region and after loop, if possible
if (auto whileOp = dyn_cast<scf::WhileOp>(barrier->getParentOp())) {
if (barrier->getParentRegion() == &whileOp.getBefore()) {
auto cond = whileOp.getBefore().front().getTerminator();
bool above = true;
for (Operation *it = cond; it != nullptr; it = it->getPrevNode()) {
if (it == barrier)
break;
if (!isReadNone(it)) {
above = false;
break;
}
}
if (above) {
rewriter.setInsertionPointToStart(&whileOp.getAfter().front());
rewriter.create<BarrierOp>(barrier.getLoc(), barrier.getOperands());
rewriter.setInsertionPoint(whileOp->getNextNode());
rewriter.create<BarrierOp>(barrier.getLoc(), barrier.getOperands());
rewriter.eraseOp(barrier);
return success();
}
}
}
return failure();
}
};
bool isCaptured(Value v, Operation *potentialUser = nullptr,
bool *seenuse = nullptr) {
SmallVector<Value> todo = {v};
while (todo.size()) {
Value v = todo.pop_back_val();
for (auto u : v.getUsers()) {
if (seenuse && u == potentialUser)
*seenuse = true;
if (isa<memref::LoadOp, LLVM::LoadOp, AffineLoadOp, polygeist::CacheLoad>(
u))
continue;
if (auto s = dyn_cast<memref::StoreOp>(u)) {
if (s.value() == v)
return true;
continue;
}
if (auto s = dyn_cast<AffineStoreOp>(u)) {
if (s.value() == v)
return true;
continue;
}
if (auto s = dyn_cast<LLVM::StoreOp>(u)) {
if (s.getValue() == v)
return true;
continue;
}
if (auto sub = dyn_cast<LLVM::GEPOp>(u)) {
todo.push_back(sub);
}
if (auto sub = dyn_cast<LLVM::BitcastOp>(u)) {
todo.push_back(sub);
}
if (auto sub = dyn_cast<LLVM::AddrSpaceCastOp>(u)) {
todo.push_back(sub);
}
if (auto sub = dyn_cast<LLVM::MemsetOp>(u)) {
continue;
}
if (auto sub = dyn_cast<LLVM::MemcpyOp>(u)) {
continue;
}
if (auto sub = dyn_cast<LLVM::MemmoveOp>(u)) {
continue;
}
if (auto sub = dyn_cast<memref::CastOp>(u)) {
todo.push_back(sub);
}
if (auto sub = dyn_cast<memref::DeallocOp>(u)) {
continue;
}
if (auto sub = dyn_cast<polygeist::SubIndexOp>(u)) {
todo.push_back(sub);
}
if (auto sub = dyn_cast<polygeist::Memref2PointerOp>(u)) {
todo.push_back(sub);
}
if (auto sub = dyn_cast<polygeist::Pointer2MemrefOp>(u)) {
todo.push_back(sub);
}
return true;
}
}
return false;
}
Value getBase(Value v) {
while (true) {
if (auto s = v.getDefiningOp<SubIndexOp>()) {
v = s.source();
continue;
}
if (auto s = v.getDefiningOp<Memref2PointerOp>()) {
v = s.source();
continue;
}
if (auto s = v.getDefiningOp<Pointer2MemrefOp>()) {
v = s.source();
continue;
}
if (auto s = v.getDefiningOp<LLVM::GEPOp>()) {
v = s.getBase();
continue;
}
if (auto s = v.getDefiningOp<LLVM::BitcastOp>()) {
v = s.getArg();
continue;
}
if (auto s = v.getDefiningOp<LLVM::AddrSpaceCastOp>()) {
v = s.getArg();
continue;
}
if (auto s = v.getDefiningOp<memref::CastOp>()) {
v = s.source();
continue;
}
break;
}
return v;
}
bool isStackAlloca(Value v) {
return v.getDefiningOp<memref::AllocaOp>() ||
v.getDefiningOp<memref::AllocOp>() ||
v.getDefiningOp<LLVM::AllocaOp>();
}
static bool mayAlias(Value v, Value v2) {
v = getBase(v);
v2 = getBase(v2);
if (v == v2)
return true;
// We may now assume neither v1 nor v2 are subindices
if (auto glob = v.getDefiningOp<memref::GetGlobalOp>()) {
if (auto Aglob = v2.getDefiningOp<memref::GetGlobalOp>()) {
return glob.name() == Aglob.name();
}
}
if (auto glob = v.getDefiningOp<LLVM::AddressOfOp>()) {
if (auto Aglob = v2.getDefiningOp<LLVM::AddressOfOp>()) {
return glob.getGlobalName() == Aglob.getGlobalName();
}
}
bool isAlloca[2];
bool isGlobal[2];
isAlloca[0] = isStackAlloca(v);
isGlobal[0] = v.getDefiningOp<memref::GetGlobalOp>() ||
v.getDefiningOp<LLVM::AddressOfOp>();
isAlloca[1] = isStackAlloca(v2);
isGlobal[1] = v2.getDefiningOp<memref::GetGlobalOp>() ||
v2.getDefiningOp<LLVM::AddressOfOp>();
// Non-equivalent allocas/global's cannot conflict with each other
if ((isAlloca[0] || isGlobal[0]) && (isAlloca[1] || isGlobal[1]))
return false;
bool isArg[2];
isArg[0] = v.isa<BlockArgument>() &&
isa<FunctionOpInterface>(
v.cast<BlockArgument>().getOwner()->getParentOp());
isArg[1] = v.isa<BlockArgument>() &&
isa<FunctionOpInterface>(
v.cast<BlockArgument>().getOwner()->getParentOp());
// Stack allocations cannot have been passed as an argument.
if ((isAlloca[0] && isArg[1]) || (isAlloca[1] && isArg[0]))
return false;
// Non captured base allocas cannot conflict with another base value.
if (isAlloca[0] && !isCaptured(v))
return false;
if (isAlloca[1] && !isCaptured(v2))
return false;
return true;
}
bool mayAlias(MemoryEffects::EffectInstance a,
MemoryEffects::EffectInstance b) {
if (Value v2 = b.getValue()) {
return mayAlias(a, v2);
}
return true;
}
bool mayAlias(MemoryEffects::EffectInstance a, Value v2) {
if (Value v = a.getValue()) {
return mayAlias(v, v2);
}
return true;
}
void BarrierOp::getCanonicalizationPatterns(RewritePatternSet &results,
MLIRContext *context) {
results.insert<BarrierHoist, BarrierElim</*TopLevelOnly*/ false>>(context);
}
/// Replace cast(subindex(x, InterimType), FinalType) with subindex(x,
/// FinalType)
class CastOfSubIndex final : public OpRewritePattern<memref::CastOp> {
public:
using OpRewritePattern<memref::CastOp>::OpRewritePattern;
LogicalResult matchAndRewrite(memref::CastOp castOp,
PatternRewriter &rewriter) const override {
auto subindexOp = castOp.source().getDefiningOp<SubIndexOp>();
if (!subindexOp)
return failure();
if (castOp.getType().cast<MemRefType>().getShape().size() !=
subindexOp.getType().cast<MemRefType>().getShape().size())
return failure();
if (castOp.getType().cast<MemRefType>().getElementType() !=
subindexOp.result().getType().cast<MemRefType>().getElementType())
return failure();
rewriter.replaceOpWithNewOp<SubIndexOp>(
castOp, castOp.getType(), subindexOp.source(), subindexOp.index());
return success();
}
};
// Replace subindex(subindex(x)) with subindex(x) with appropriate
// indexing.
class SubIndex2 final : public OpRewritePattern<SubIndexOp> {
public:
using OpRewritePattern<SubIndexOp>::OpRewritePattern;
LogicalResult matchAndRewrite(SubIndexOp subViewOp,
PatternRewriter &rewriter) const override {
auto prevOp = subViewOp.source().getDefiningOp<SubIndexOp>();
if (!prevOp)
return failure();
auto mt0 = prevOp.source().getType().cast<MemRefType>();
auto mt1 = prevOp.getType().cast<MemRefType>();
auto mt2 = subViewOp.getType().cast<MemRefType>();
if (mt0.getShape().size() == mt2.getShape().size() &&
mt1.getShape().size() == mt0.getShape().size() + 1) {
rewriter.replaceOpWithNewOp<SubIndexOp>(subViewOp, mt2, prevOp.source(),
subViewOp.index());
return success();
}
if (mt0.getShape().size() == mt2.getShape().size() &&
mt1.getShape().size() == mt0.getShape().size()) {
rewriter.replaceOpWithNewOp<SubIndexOp>(
subViewOp, mt2, prevOp.source(),
rewriter.create<AddIOp>(prevOp.getLoc(), subViewOp.index(),
prevOp.index()));
return success();
}
return failure();
}
};
// When possible, simplify subindex(x) to cast(x)
class SubToCast final : public OpRewritePattern<SubIndexOp> {
public:
using OpRewritePattern<SubIndexOp>::OpRewritePattern;
LogicalResult matchAndRewrite(SubIndexOp subViewOp,
PatternRewriter &rewriter) const override {
auto prev = subViewOp.source().getType().cast<MemRefType>();
auto post = subViewOp.getType().cast<MemRefType>();
bool legal = prev.getShape().size() == post.getShape().size();
if (legal) {
auto cidx = subViewOp.index().getDefiningOp<ConstantIndexOp>();
if (!cidx)
return failure();
if (cidx.value() != 0)
return failure();
rewriter.replaceOpWithNewOp<memref::CastOp>(subViewOp, post,
subViewOp.source());
return success();
}
return failure();
}
};
// Simplify redundant dynamic subindex patterns which tries to represent
// rank-reducing indexing:
// %3 = "polygeist.subindex"(%1, %arg0) : (memref<2x1000xi32>, index) ->
// memref<?x1000xi32> %4 = "polygeist.subindex"(%3, %c0) :
// (memref<?x1000xi32>, index) -> memref<1000xi32>
// simplifies to:
// %4 = "polygeist.subindex"(%1, %arg0) : (memref<2x1000xi32>, index) ->
// memref<1000xi32>
class RedundantDynSubIndex final : public OpRewritePattern<SubIndexOp> {
public:
using OpRewritePattern<SubIndexOp>::OpRewritePattern;
LogicalResult matchAndRewrite(SubIndexOp op,
PatternRewriter &rewriter) const override {
auto srcOp = op.source().getDefiningOp<SubIndexOp>();
if (!srcOp)
return failure();
auto preMemRefType = srcOp.source().getType().cast<MemRefType>();
auto srcMemRefType = op.source().getType().cast<MemRefType>();
auto resMemRefType = op.result().getType().cast<MemRefType>();
// Check that this is indeed a rank reducing operation
if (srcMemRefType.getShape().size() !=
(resMemRefType.getShape().size() + 1))
return failure();
// Check that the previous op is the same rank.
if (srcMemRefType.getShape().size() != preMemRefType.getShape().size())
return failure();
// Valid optimization target; perform the substitution.
rewriter.replaceOpWithNewOp<SubIndexOp>(
op, op.result().getType(), srcOp.source(),
rewriter.create<arith::AddIOp>(op.getLoc(), op.index(), srcOp.index()));
return success();
}
};
/// Simplify all uses of subindex, specifically
// store subindex(x) = ...
// affine.store subindex(x) = ...
// load subindex(x)
// affine.load subindex(x)
// dealloc subindex(x)
struct SimplifySubIndexUsers : public OpRewritePattern<SubIndexOp> {
using OpRewritePattern<SubIndexOp>::OpRewritePattern;
LogicalResult matchAndRewrite(SubIndexOp subindex,
PatternRewriter &rewriter) const override {
bool changed = false;
for (OpOperand &use : llvm::make_early_inc_range(subindex->getUses())) {
rewriter.setInsertionPoint(use.getOwner());
if (auto dealloc = dyn_cast<memref::DeallocOp>(use.getOwner())) {
changed = true;
rewriter.replaceOpWithNewOp<memref::DeallocOp>(dealloc,
subindex.source());
} else if (auto loadOp = dyn_cast<memref::LoadOp>(use.getOwner())) {
if (loadOp.memref() == subindex) {
SmallVector<Value, 4> indices = loadOp.indices();
if (subindex.getType().cast<MemRefType>().getShape().size() ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size()) {
assert(indices.size() > 0);
indices[0] = rewriter.create<AddIOp>(subindex.getLoc(), indices[0],
subindex.index());
} else {
assert(subindex.getType().cast<MemRefType>().getShape().size() +
1 ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size());
indices.insert(indices.begin(), subindex.index());
}
assert(subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size() == indices.size());
rewriter.replaceOpWithNewOp<memref::LoadOp>(loadOp, subindex.source(),
indices);
changed = true;
}
} else if (auto storeOp = dyn_cast<memref::StoreOp>(use.getOwner())) {
if (storeOp.memref() == subindex) {
SmallVector<Value, 4> indices = storeOp.indices();
if (subindex.getType().cast<MemRefType>().getShape().size() ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size()) {
assert(indices.size() > 0);
indices[0] = rewriter.create<AddIOp>(subindex.getLoc(), indices[0],
subindex.index());
} else {
assert(subindex.getType().cast<MemRefType>().getShape().size() +
1 ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size());
indices.insert(indices.begin(), subindex.index());
}
assert(subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size() == indices.size());
rewriter.replaceOpWithNewOp<memref::StoreOp>(
storeOp, storeOp.value(), subindex.source(), indices);
changed = true;
}
} else if (auto storeOp = dyn_cast<memref::AtomicRMWOp>(use.getOwner())) {
if (storeOp.memref() == subindex) {
SmallVector<Value, 4> indices = storeOp.indices();
if (subindex.getType().cast<MemRefType>().getShape().size() ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size()) {
assert(indices.size() > 0);
indices[0] = rewriter.create<AddIOp>(subindex.getLoc(), indices[0],
subindex.index());
} else {
assert(subindex.getType().cast<MemRefType>().getShape().size() +
1 ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size());
indices.insert(indices.begin(), subindex.index());
}
assert(subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size() == indices.size());
rewriter.replaceOpWithNewOp<memref::AtomicRMWOp>(
storeOp, storeOp.getType(), storeOp.kind(), storeOp.value(),
subindex.source(), indices);
changed = true;
}
} else if (auto storeOp = dyn_cast<AffineStoreOp>(use.getOwner())) {
if (storeOp.memref() == subindex) {
if (subindex.getType().cast<MemRefType>().getShape().size() + 1 ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size()) {
std::vector<Value> indices;
auto map = storeOp.getAffineMap();
indices.push_back(subindex.index());
for (size_t i = 0; i < map.getNumResults(); i++) {
auto apply = rewriter.create<AffineApplyOp>(
storeOp.getLoc(), map.getSliceMap(i, 1),
storeOp.getMapOperands());
indices.push_back(apply->getResult(0));
}
assert(subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size() == indices.size());
rewriter.replaceOpWithNewOp<memref::StoreOp>(
storeOp, storeOp.value(), subindex.source(), indices);
changed = true;
}
}
} else if (auto storeOp = dyn_cast<AffineLoadOp>(use.getOwner())) {
if (storeOp.memref() == subindex) {
if (subindex.getType().cast<MemRefType>().getShape().size() + 1 ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size()) {
std::vector<Value> indices;
auto map = storeOp.getAffineMap();
indices.push_back(subindex.index());
for (size_t i = 0; i < map.getNumResults(); i++) {
auto apply = rewriter.create<AffineApplyOp>(
storeOp.getLoc(), map.getSliceMap(i, 1),
storeOp.getMapOperands());
indices.push_back(apply->getResult(0));
}
assert(subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size() == indices.size());
rewriter.replaceOpWithNewOp<memref::LoadOp>(
storeOp, subindex.source(), indices);
changed = true;
}
}
}
}
return success(changed);
}
};
/// Simplify all uses of subindex, specifically
// store subindex(x) = ...
// affine.store subindex(x) = ...
// load subindex(x)
// affine.load subindex(x)
// dealloc subindex(x)
struct SimplifySubViewUsers : public OpRewritePattern<memref::SubViewOp> {
using OpRewritePattern<memref::SubViewOp>::OpRewritePattern;
LogicalResult matchAndRewrite(memref::SubViewOp subindex,
PatternRewriter &rewriter) const override {
bool changed = false;
int64_t offs = -1;
for (auto tup :
llvm::zip(subindex.static_offsets(), subindex.static_sizes(),
subindex.static_strides())) {
auto sz = std::get<1>(tup).dyn_cast<IntegerAttr>().getValue();
auto stride = std::get<2>(tup).dyn_cast<IntegerAttr>().getValue();
if (stride != 1)
return failure();
if (offs == -1) {
offs = std::get<0>(tup)
.dyn_cast<IntegerAttr>()
.getValue()
.getLimitedValue();
if (sz != 1)
return failure();
}
}
Value off = rewriter.create<ConstantIndexOp>(subindex.getLoc(), offs);
assert(off);
for (OpOperand &use : llvm::make_early_inc_range(subindex->getUses())) {
rewriter.setInsertionPoint(use.getOwner());
if (auto dealloc = dyn_cast<memref::DeallocOp>(use.getOwner())) {
changed = true;
rewriter.replaceOpWithNewOp<memref::DeallocOp>(dealloc,
subindex.source());
} else if (auto loadOp = dyn_cast<memref::LoadOp>(use.getOwner())) {
if (loadOp.memref() == subindex) {
SmallVector<Value, 4> indices = loadOp.indices();
if (subindex.getType().cast<MemRefType>().getShape().size() ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size()) {
assert(indices.size() > 0);
indices[0] =
rewriter.create<AddIOp>(subindex.getLoc(), indices[0], off);
} else {
if (subindex.getType().cast<MemRefType>().getShape().size() + 1 ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size())
indices.insert(indices.begin(), off);
else {
assert(indices.size() > 0);
indices.erase(indices.begin());
}
}
assert(subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size() == indices.size());
rewriter.replaceOpWithNewOp<memref::LoadOp>(loadOp, subindex.source(),
indices);
changed = true;
}
} else if (auto storeOp = dyn_cast<memref::StoreOp>(use.getOwner())) {
if (storeOp.memref() == subindex) {
SmallVector<Value, 4> indices = storeOp.indices();
if (subindex.getType().cast<MemRefType>().getShape().size() ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size()) {
assert(indices.size() > 0);
indices[0] =
rewriter.create<AddIOp>(subindex.getLoc(), indices[0], off);
} else {
if (subindex.getType().cast<MemRefType>().getShape().size() + 1 ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size())
indices.insert(indices.begin(), off);
else {
if (indices.size() == 0) {
llvm::errs() << " storeOp: " << storeOp
<< " - subidx: " << subindex << "\n";
}
assert(indices.size() > 0);
indices.erase(indices.begin());
}
}
if (subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size() != indices.size()) {
llvm::errs() << " storeOp: " << storeOp << " - subidx: " << subindex
<< "\n";
}
assert(subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size() == indices.size());
rewriter.replaceOpWithNewOp<memref::StoreOp>(
storeOp, storeOp.value(), subindex.source(), indices);
changed = true;
}
} else if (auto storeOp = dyn_cast<AffineStoreOp>(use.getOwner())) {
if (storeOp.memref() == subindex) {
if (subindex.getType().cast<MemRefType>().getShape().size() + 1 ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size()) {
std::vector<Value> indices;
auto map = storeOp.getAffineMap();
indices.push_back(off);
for (size_t i = 0; i < map.getNumResults(); i++) {
auto apply = rewriter.create<AffineApplyOp>(
storeOp.getLoc(), map.getSliceMap(i, 1),
storeOp.getMapOperands());
indices.push_back(apply->getResult(0));
}
assert(subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size() == indices.size());
rewriter.replaceOpWithNewOp<memref::StoreOp>(
storeOp, storeOp.value(), subindex.source(), indices);
changed = true;
}
}
} else if (auto storeOp = dyn_cast<AffineLoadOp>(use.getOwner())) {
if (storeOp.memref() == subindex) {
if (subindex.getType().cast<MemRefType>().getShape().size() + 1 ==
subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size()) {
std::vector<Value> indices;
auto map = storeOp.getAffineMap();
indices.push_back(off);
for (size_t i = 0; i < map.getNumResults(); i++) {
auto apply = rewriter.create<AffineApplyOp>(
storeOp.getLoc(), map.getSliceMap(i, 1),
storeOp.getMapOperands());
indices.push_back(apply->getResult(0));
}
assert(subindex.source()
.getType()
.cast<MemRefType>()
.getShape()
.size() == indices.size());
rewriter.replaceOpWithNewOp<memref::LoadOp>(
storeOp, subindex.source(), indices);
changed = true;
}
}
}
}
return success(changed);
}
};
/// Simplify select cast(x), cast(y) to cast(select x, y)
struct SelectOfCast : public OpRewritePattern<SelectOp> {
using OpRewritePattern<SelectOp>::OpRewritePattern;
LogicalResult matchAndRewrite(SelectOp op,
PatternRewriter &rewriter) const override {
auto cst1 = op.getTrueValue().getDefiningOp<memref::CastOp>();
if (!cst1)
return failure();
auto cst2 = op.getFalseValue().getDefiningOp<memref::CastOp>();
if (!cst2)
return failure();
if (cst1.source().getType() != cst2.source().getType())
return failure();
auto newSel = rewriter.create<SelectOp>(op.getLoc(), op.getCondition(),
cst1.source(), cst2.source());
rewriter.replaceOpWithNewOp<memref::CastOp>(op, op.getType(), newSel);
return success();
}
};
/// Simplify select subindex(x), subindex(y) to subindex(select x, y)
struct SelectOfSubIndex : public OpRewritePattern<SelectOp> {
using OpRewritePattern<SelectOp>::OpRewritePattern;
LogicalResult matchAndRewrite(SelectOp op,
PatternRewriter &rewriter) const override {
auto cst1 = op.getTrueValue().getDefiningOp<SubIndexOp>();
if (!cst1)
return failure();
auto cst2 = op.getFalseValue().getDefiningOp<SubIndexOp>();
if (!cst2)
return failure();
if (cst1.source().getType() != cst2.source().getType())
return failure();
auto newSel = rewriter.create<SelectOp>(op.getLoc(), op.getCondition(),
cst1.source(), cst2.source());
auto newIdx = rewriter.create<SelectOp>(op.getLoc(), op.getCondition(),
cst1.index(), cst2.index());
rewriter.replaceOpWithNewOp<SubIndexOp>(op, op.getType(), newSel, newIdx);
return success();
}
};
/// Simplify select subindex(x), subindex(y) to subindex(select x, y)
template <typename T> struct LoadSelect : public OpRewritePattern<T> {
using OpRewritePattern<T>::OpRewritePattern;
static Value ptr(T op);
static MutableOperandRange ptrMutable(T op);
LogicalResult matchAndRewrite(T op,
PatternRewriter &rewriter) const override {
auto mem0 = ptr(op);
SelectOp mem = dyn_cast_or_null<SelectOp>(mem0.getDefiningOp());
if (!mem)
return failure();