forked from OSchip/llvm-project
526 lines
23 KiB
C++
526 lines
23 KiB
C++
//===- MemRefBuilder.cpp - Helper for LLVM MemRef equivalents -------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#include "mlir/Conversion/LLVMCommon/MemRefBuilder.h"
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#include "MemRefDescriptor.h"
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#include "mlir/Conversion/LLVMCommon/TypeConverter.h"
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#include "mlir/Dialect/LLVMIR/LLVMDialect.h"
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#include "mlir/IR/Builders.h"
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#include "mlir/Support/MathExtras.h"
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using namespace mlir;
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//===----------------------------------------------------------------------===//
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// MemRefDescriptor implementation
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//===----------------------------------------------------------------------===//
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/// Construct a helper for the given descriptor value.
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MemRefDescriptor::MemRefDescriptor(Value descriptor)
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: StructBuilder(descriptor) {
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assert(value != nullptr && "value cannot be null");
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indexType = value.getType()
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.cast<LLVM::LLVMStructType>()
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.getBody()[kOffsetPosInMemRefDescriptor];
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}
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/// Builds IR creating an `undef` value of the descriptor type.
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MemRefDescriptor MemRefDescriptor::undef(OpBuilder &builder, Location loc,
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Type descriptorType) {
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Value descriptor = builder.create<LLVM::UndefOp>(loc, descriptorType);
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return MemRefDescriptor(descriptor);
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}
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/// Builds IR creating a MemRef descriptor that represents `type` and
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/// populates it with static shape and stride information extracted from the
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/// type.
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MemRefDescriptor
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MemRefDescriptor::fromStaticShape(OpBuilder &builder, Location loc,
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LLVMTypeConverter &typeConverter,
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MemRefType type, Value memory) {
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assert(type.hasStaticShape() && "unexpected dynamic shape");
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// Extract all strides and offsets and verify they are static.
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int64_t offset;
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SmallVector<int64_t, 4> strides;
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auto result = getStridesAndOffset(type, strides, offset);
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(void)result;
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assert(succeeded(result) && "unexpected failure in stride computation");
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assert(!ShapedType::isDynamicStrideOrOffset(offset) &&
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"expected static offset");
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assert(!llvm::any_of(strides, [](int64_t stride) {
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return ShapedType::isDynamicStrideOrOffset(stride);
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}) && "expected static strides");
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auto convertedType = typeConverter.convertType(type);
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assert(convertedType && "unexpected failure in memref type conversion");
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auto descr = MemRefDescriptor::undef(builder, loc, convertedType);
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descr.setAllocatedPtr(builder, loc, memory);
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descr.setAlignedPtr(builder, loc, memory);
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descr.setConstantOffset(builder, loc, offset);
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// Fill in sizes and strides
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for (unsigned i = 0, e = type.getRank(); i != e; ++i) {
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descr.setConstantSize(builder, loc, i, type.getDimSize(i));
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descr.setConstantStride(builder, loc, i, strides[i]);
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}
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return descr;
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}
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/// Builds IR extracting the allocated pointer from the descriptor.
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Value MemRefDescriptor::allocatedPtr(OpBuilder &builder, Location loc) {
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return extractPtr(builder, loc, kAllocatedPtrPosInMemRefDescriptor);
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}
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/// Builds IR inserting the allocated pointer into the descriptor.
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void MemRefDescriptor::setAllocatedPtr(OpBuilder &builder, Location loc,
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Value ptr) {
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setPtr(builder, loc, kAllocatedPtrPosInMemRefDescriptor, ptr);
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}
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/// Builds IR extracting the aligned pointer from the descriptor.
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Value MemRefDescriptor::alignedPtr(OpBuilder &builder, Location loc) {
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return extractPtr(builder, loc, kAlignedPtrPosInMemRefDescriptor);
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}
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/// Builds IR inserting the aligned pointer into the descriptor.
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void MemRefDescriptor::setAlignedPtr(OpBuilder &builder, Location loc,
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Value ptr) {
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setPtr(builder, loc, kAlignedPtrPosInMemRefDescriptor, ptr);
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}
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// Creates a constant Op producing a value of `resultType` from an index-typed
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// integer attribute.
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static Value createIndexAttrConstant(OpBuilder &builder, Location loc,
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Type resultType, int64_t value) {
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return builder.create<LLVM::ConstantOp>(
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loc, resultType, builder.getIntegerAttr(builder.getIndexType(), value));
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}
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/// Builds IR extracting the offset from the descriptor.
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Value MemRefDescriptor::offset(OpBuilder &builder, Location loc) {
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return builder.create<LLVM::ExtractValueOp>(
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loc, indexType, value,
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builder.getI64ArrayAttr(kOffsetPosInMemRefDescriptor));
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}
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/// Builds IR inserting the offset into the descriptor.
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void MemRefDescriptor::setOffset(OpBuilder &builder, Location loc,
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Value offset) {
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value = builder.create<LLVM::InsertValueOp>(
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loc, structType, value, offset,
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builder.getI64ArrayAttr(kOffsetPosInMemRefDescriptor));
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}
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/// Builds IR inserting the offset into the descriptor.
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void MemRefDescriptor::setConstantOffset(OpBuilder &builder, Location loc,
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uint64_t offset) {
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setOffset(builder, loc,
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createIndexAttrConstant(builder, loc, indexType, offset));
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}
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/// Builds IR extracting the pos-th size from the descriptor.
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Value MemRefDescriptor::size(OpBuilder &builder, Location loc, unsigned pos) {
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return builder.create<LLVM::ExtractValueOp>(
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loc, indexType, value,
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builder.getI64ArrayAttr({kSizePosInMemRefDescriptor, pos}));
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}
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Value MemRefDescriptor::size(OpBuilder &builder, Location loc, Value pos,
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int64_t rank) {
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auto indexPtrTy = LLVM::LLVMPointerType::get(indexType);
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auto arrayTy = LLVM::LLVMArrayType::get(indexType, rank);
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auto arrayPtrTy = LLVM::LLVMPointerType::get(arrayTy);
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// Copy size values to stack-allocated memory.
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auto zero = createIndexAttrConstant(builder, loc, indexType, 0);
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auto one = createIndexAttrConstant(builder, loc, indexType, 1);
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auto sizes = builder.create<LLVM::ExtractValueOp>(
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loc, arrayTy, value,
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builder.getI64ArrayAttr({kSizePosInMemRefDescriptor}));
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auto sizesPtr =
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builder.create<LLVM::AllocaOp>(loc, arrayPtrTy, one, /*alignment=*/0);
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builder.create<LLVM::StoreOp>(loc, sizes, sizesPtr);
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// Load an return size value of interest.
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auto resultPtr = builder.create<LLVM::GEPOp>(loc, indexPtrTy, sizesPtr,
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ValueRange({zero, pos}));
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return builder.create<LLVM::LoadOp>(loc, resultPtr);
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}
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/// Builds IR inserting the pos-th size into the descriptor
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void MemRefDescriptor::setSize(OpBuilder &builder, Location loc, unsigned pos,
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Value size) {
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value = builder.create<LLVM::InsertValueOp>(
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loc, structType, value, size,
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builder.getI64ArrayAttr({kSizePosInMemRefDescriptor, pos}));
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}
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void MemRefDescriptor::setConstantSize(OpBuilder &builder, Location loc,
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unsigned pos, uint64_t size) {
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setSize(builder, loc, pos,
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createIndexAttrConstant(builder, loc, indexType, size));
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}
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/// Builds IR extracting the pos-th stride from the descriptor.
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Value MemRefDescriptor::stride(OpBuilder &builder, Location loc, unsigned pos) {
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return builder.create<LLVM::ExtractValueOp>(
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loc, indexType, value,
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builder.getI64ArrayAttr({kStridePosInMemRefDescriptor, pos}));
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}
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/// Builds IR inserting the pos-th stride into the descriptor
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void MemRefDescriptor::setStride(OpBuilder &builder, Location loc, unsigned pos,
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Value stride) {
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value = builder.create<LLVM::InsertValueOp>(
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loc, structType, value, stride,
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builder.getI64ArrayAttr({kStridePosInMemRefDescriptor, pos}));
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}
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void MemRefDescriptor::setConstantStride(OpBuilder &builder, Location loc,
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unsigned pos, uint64_t stride) {
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setStride(builder, loc, pos,
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createIndexAttrConstant(builder, loc, indexType, stride));
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}
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LLVM::LLVMPointerType MemRefDescriptor::getElementPtrType() {
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return value.getType()
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.cast<LLVM::LLVMStructType>()
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.getBody()[kAlignedPtrPosInMemRefDescriptor]
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.cast<LLVM::LLVMPointerType>();
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}
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/// Creates a MemRef descriptor structure from a list of individual values
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/// composing that descriptor, in the following order:
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/// - allocated pointer;
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/// - aligned pointer;
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/// - offset;
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/// - <rank> sizes;
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/// - <rank> shapes;
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/// where <rank> is the MemRef rank as provided in `type`.
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Value MemRefDescriptor::pack(OpBuilder &builder, Location loc,
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LLVMTypeConverter &converter, MemRefType type,
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ValueRange values) {
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Type llvmType = converter.convertType(type);
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auto d = MemRefDescriptor::undef(builder, loc, llvmType);
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d.setAllocatedPtr(builder, loc, values[kAllocatedPtrPosInMemRefDescriptor]);
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d.setAlignedPtr(builder, loc, values[kAlignedPtrPosInMemRefDescriptor]);
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d.setOffset(builder, loc, values[kOffsetPosInMemRefDescriptor]);
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int64_t rank = type.getRank();
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for (unsigned i = 0; i < rank; ++i) {
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d.setSize(builder, loc, i, values[kSizePosInMemRefDescriptor + i]);
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d.setStride(builder, loc, i, values[kSizePosInMemRefDescriptor + rank + i]);
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}
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return d;
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}
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/// Builds IR extracting individual elements of a MemRef descriptor structure
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/// and returning them as `results` list.
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void MemRefDescriptor::unpack(OpBuilder &builder, Location loc, Value packed,
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MemRefType type,
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SmallVectorImpl<Value> &results) {
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int64_t rank = type.getRank();
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results.reserve(results.size() + getNumUnpackedValues(type));
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MemRefDescriptor d(packed);
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results.push_back(d.allocatedPtr(builder, loc));
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results.push_back(d.alignedPtr(builder, loc));
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results.push_back(d.offset(builder, loc));
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for (int64_t i = 0; i < rank; ++i)
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results.push_back(d.size(builder, loc, i));
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for (int64_t i = 0; i < rank; ++i)
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results.push_back(d.stride(builder, loc, i));
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}
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/// Returns the number of non-aggregate values that would be produced by
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/// `unpack`.
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unsigned MemRefDescriptor::getNumUnpackedValues(MemRefType type) {
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// Two pointers, offset, <rank> sizes, <rank> shapes.
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return 3 + 2 * type.getRank();
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}
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//===----------------------------------------------------------------------===//
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// MemRefDescriptorView implementation.
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//===----------------------------------------------------------------------===//
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MemRefDescriptorView::MemRefDescriptorView(ValueRange range)
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: rank((range.size() - kSizePosInMemRefDescriptor) / 2), elements(range) {}
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Value MemRefDescriptorView::allocatedPtr() {
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return elements[kAllocatedPtrPosInMemRefDescriptor];
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}
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Value MemRefDescriptorView::alignedPtr() {
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return elements[kAlignedPtrPosInMemRefDescriptor];
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}
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Value MemRefDescriptorView::offset() {
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return elements[kOffsetPosInMemRefDescriptor];
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}
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Value MemRefDescriptorView::size(unsigned pos) {
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return elements[kSizePosInMemRefDescriptor + pos];
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}
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Value MemRefDescriptorView::stride(unsigned pos) {
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return elements[kSizePosInMemRefDescriptor + rank + pos];
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}
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//===----------------------------------------------------------------------===//
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// UnrankedMemRefDescriptor implementation
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//===----------------------------------------------------------------------===//
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/// Construct a helper for the given descriptor value.
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UnrankedMemRefDescriptor::UnrankedMemRefDescriptor(Value descriptor)
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: StructBuilder(descriptor) {}
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/// Builds IR creating an `undef` value of the descriptor type.
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UnrankedMemRefDescriptor UnrankedMemRefDescriptor::undef(OpBuilder &builder,
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Location loc,
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Type descriptorType) {
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Value descriptor = builder.create<LLVM::UndefOp>(loc, descriptorType);
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return UnrankedMemRefDescriptor(descriptor);
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}
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Value UnrankedMemRefDescriptor::rank(OpBuilder &builder, Location loc) {
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return extractPtr(builder, loc, kRankInUnrankedMemRefDescriptor);
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}
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void UnrankedMemRefDescriptor::setRank(OpBuilder &builder, Location loc,
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Value v) {
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setPtr(builder, loc, kRankInUnrankedMemRefDescriptor, v);
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}
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Value UnrankedMemRefDescriptor::memRefDescPtr(OpBuilder &builder,
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Location loc) {
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return extractPtr(builder, loc, kPtrInUnrankedMemRefDescriptor);
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}
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void UnrankedMemRefDescriptor::setMemRefDescPtr(OpBuilder &builder,
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Location loc, Value v) {
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setPtr(builder, loc, kPtrInUnrankedMemRefDescriptor, v);
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}
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/// Builds IR populating an unranked MemRef descriptor structure from a list
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/// of individual constituent values in the following order:
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/// - rank of the memref;
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/// - pointer to the memref descriptor.
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Value UnrankedMemRefDescriptor::pack(OpBuilder &builder, Location loc,
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LLVMTypeConverter &converter,
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UnrankedMemRefType type,
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ValueRange values) {
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Type llvmType = converter.convertType(type);
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auto d = UnrankedMemRefDescriptor::undef(builder, loc, llvmType);
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d.setRank(builder, loc, values[kRankInUnrankedMemRefDescriptor]);
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d.setMemRefDescPtr(builder, loc, values[kPtrInUnrankedMemRefDescriptor]);
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return d;
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}
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/// Builds IR extracting individual elements that compose an unranked memref
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/// descriptor and returns them as `results` list.
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void UnrankedMemRefDescriptor::unpack(OpBuilder &builder, Location loc,
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Value packed,
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SmallVectorImpl<Value> &results) {
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UnrankedMemRefDescriptor d(packed);
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results.reserve(results.size() + 2);
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results.push_back(d.rank(builder, loc));
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results.push_back(d.memRefDescPtr(builder, loc));
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}
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void UnrankedMemRefDescriptor::computeSizes(
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OpBuilder &builder, Location loc, LLVMTypeConverter &typeConverter,
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ArrayRef<UnrankedMemRefDescriptor> values, SmallVectorImpl<Value> &sizes) {
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if (values.empty())
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return;
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// Cache the index type.
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Type indexType = typeConverter.getIndexType();
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// Initialize shared constants.
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Value one = createIndexAttrConstant(builder, loc, indexType, 1);
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Value two = createIndexAttrConstant(builder, loc, indexType, 2);
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Value pointerSize = createIndexAttrConstant(
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builder, loc, indexType, ceilDiv(typeConverter.getPointerBitwidth(), 8));
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Value indexSize =
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createIndexAttrConstant(builder, loc, indexType,
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ceilDiv(typeConverter.getIndexTypeBitwidth(), 8));
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sizes.reserve(sizes.size() + values.size());
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for (UnrankedMemRefDescriptor desc : values) {
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// Emit IR computing the memory necessary to store the descriptor. This
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// assumes the descriptor to be
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// { type*, type*, index, index[rank], index[rank] }
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// and densely packed, so the total size is
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// 2 * sizeof(pointer) + (1 + 2 * rank) * sizeof(index).
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// TODO: consider including the actual size (including eventual padding due
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// to data layout) into the unranked descriptor.
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Value doublePointerSize =
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builder.create<LLVM::MulOp>(loc, indexType, two, pointerSize);
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// (1 + 2 * rank) * sizeof(index)
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Value rank = desc.rank(builder, loc);
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Value doubleRank = builder.create<LLVM::MulOp>(loc, indexType, two, rank);
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Value doubleRankIncremented =
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builder.create<LLVM::AddOp>(loc, indexType, doubleRank, one);
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Value rankIndexSize = builder.create<LLVM::MulOp>(
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loc, indexType, doubleRankIncremented, indexSize);
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// Total allocation size.
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Value allocationSize = builder.create<LLVM::AddOp>(
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loc, indexType, doublePointerSize, rankIndexSize);
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sizes.push_back(allocationSize);
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}
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}
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Value UnrankedMemRefDescriptor::allocatedPtr(OpBuilder &builder, Location loc,
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Value memRefDescPtr,
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Type elemPtrPtrType) {
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Value elementPtrPtr =
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builder.create<LLVM::BitcastOp>(loc, elemPtrPtrType, memRefDescPtr);
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return builder.create<LLVM::LoadOp>(loc, elementPtrPtr);
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}
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void UnrankedMemRefDescriptor::setAllocatedPtr(OpBuilder &builder, Location loc,
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Value memRefDescPtr,
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Type elemPtrPtrType,
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Value allocatedPtr) {
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Value elementPtrPtr =
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builder.create<LLVM::BitcastOp>(loc, elemPtrPtrType, memRefDescPtr);
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builder.create<LLVM::StoreOp>(loc, allocatedPtr, elementPtrPtr);
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}
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Value UnrankedMemRefDescriptor::alignedPtr(OpBuilder &builder, Location loc,
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LLVMTypeConverter &typeConverter,
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Value memRefDescPtr,
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Type elemPtrPtrType) {
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Value elementPtrPtr =
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builder.create<LLVM::BitcastOp>(loc, elemPtrPtrType, memRefDescPtr);
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Value one =
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createIndexAttrConstant(builder, loc, typeConverter.getIndexType(), 1);
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Value alignedGep = builder.create<LLVM::GEPOp>(
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loc, elemPtrPtrType, elementPtrPtr, ValueRange({one}));
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return builder.create<LLVM::LoadOp>(loc, alignedGep);
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}
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void UnrankedMemRefDescriptor::setAlignedPtr(OpBuilder &builder, Location loc,
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LLVMTypeConverter &typeConverter,
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Value memRefDescPtr,
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Type elemPtrPtrType,
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Value alignedPtr) {
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Value elementPtrPtr =
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builder.create<LLVM::BitcastOp>(loc, elemPtrPtrType, memRefDescPtr);
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Value one =
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createIndexAttrConstant(builder, loc, typeConverter.getIndexType(), 1);
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Value alignedGep = builder.create<LLVM::GEPOp>(
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loc, elemPtrPtrType, elementPtrPtr, ValueRange({one}));
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builder.create<LLVM::StoreOp>(loc, alignedPtr, alignedGep);
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}
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Value UnrankedMemRefDescriptor::offset(OpBuilder &builder, Location loc,
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LLVMTypeConverter &typeConverter,
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Value memRefDescPtr,
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Type elemPtrPtrType) {
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Value elementPtrPtr =
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builder.create<LLVM::BitcastOp>(loc, elemPtrPtrType, memRefDescPtr);
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Value two =
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createIndexAttrConstant(builder, loc, typeConverter.getIndexType(), 2);
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Value offsetGep = builder.create<LLVM::GEPOp>(
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loc, elemPtrPtrType, elementPtrPtr, ValueRange({two}));
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offsetGep = builder.create<LLVM::BitcastOp>(
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loc, LLVM::LLVMPointerType::get(typeConverter.getIndexType()), offsetGep);
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return builder.create<LLVM::LoadOp>(loc, offsetGep);
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}
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void UnrankedMemRefDescriptor::setOffset(OpBuilder &builder, Location loc,
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LLVMTypeConverter &typeConverter,
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Value memRefDescPtr,
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Type elemPtrPtrType, Value offset) {
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Value elementPtrPtr =
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builder.create<LLVM::BitcastOp>(loc, elemPtrPtrType, memRefDescPtr);
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Value two =
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createIndexAttrConstant(builder, loc, typeConverter.getIndexType(), 2);
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Value offsetGep = builder.create<LLVM::GEPOp>(
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loc, elemPtrPtrType, elementPtrPtr, ValueRange({two}));
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offsetGep = builder.create<LLVM::BitcastOp>(
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loc, LLVM::LLVMPointerType::get(typeConverter.getIndexType()), offsetGep);
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builder.create<LLVM::StoreOp>(loc, offset, offsetGep);
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}
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Value UnrankedMemRefDescriptor::sizeBasePtr(
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OpBuilder &builder, Location loc, LLVMTypeConverter &typeConverter,
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Value memRefDescPtr, LLVM::LLVMPointerType elemPtrPtrType) {
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Type elemPtrTy = elemPtrPtrType.getElementType();
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Type indexTy = typeConverter.getIndexType();
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Type structPtrTy =
|
|
LLVM::LLVMPointerType::get(LLVM::LLVMStructType::getLiteral(
|
|
indexTy.getContext(), {elemPtrTy, elemPtrTy, indexTy, indexTy}));
|
|
Value structPtr =
|
|
builder.create<LLVM::BitcastOp>(loc, structPtrTy, memRefDescPtr);
|
|
|
|
Type int32Type = typeConverter.convertType(builder.getI32Type());
|
|
Value zero =
|
|
createIndexAttrConstant(builder, loc, typeConverter.getIndexType(), 0);
|
|
Value three = builder.create<LLVM::ConstantOp>(loc, int32Type,
|
|
builder.getI32IntegerAttr(3));
|
|
return builder.create<LLVM::GEPOp>(loc, LLVM::LLVMPointerType::get(indexTy),
|
|
structPtr, ValueRange({zero, three}));
|
|
}
|
|
|
|
Value UnrankedMemRefDescriptor::size(OpBuilder &builder, Location loc,
|
|
LLVMTypeConverter &typeConverter,
|
|
Value sizeBasePtr, Value index) {
|
|
Type indexPtrTy = LLVM::LLVMPointerType::get(typeConverter.getIndexType());
|
|
Value sizeStoreGep = builder.create<LLVM::GEPOp>(loc, indexPtrTy, sizeBasePtr,
|
|
ValueRange({index}));
|
|
return builder.create<LLVM::LoadOp>(loc, sizeStoreGep);
|
|
}
|
|
|
|
void UnrankedMemRefDescriptor::setSize(OpBuilder &builder, Location loc,
|
|
LLVMTypeConverter &typeConverter,
|
|
Value sizeBasePtr, Value index,
|
|
Value size) {
|
|
Type indexPtrTy = LLVM::LLVMPointerType::get(typeConverter.getIndexType());
|
|
Value sizeStoreGep = builder.create<LLVM::GEPOp>(loc, indexPtrTy, sizeBasePtr,
|
|
ValueRange({index}));
|
|
builder.create<LLVM::StoreOp>(loc, size, sizeStoreGep);
|
|
}
|
|
|
|
Value UnrankedMemRefDescriptor::strideBasePtr(OpBuilder &builder, Location loc,
|
|
LLVMTypeConverter &typeConverter,
|
|
Value sizeBasePtr, Value rank) {
|
|
Type indexPtrTy = LLVM::LLVMPointerType::get(typeConverter.getIndexType());
|
|
return builder.create<LLVM::GEPOp>(loc, indexPtrTy, sizeBasePtr,
|
|
ValueRange({rank}));
|
|
}
|
|
|
|
Value UnrankedMemRefDescriptor::stride(OpBuilder &builder, Location loc,
|
|
LLVMTypeConverter &typeConverter,
|
|
Value strideBasePtr, Value index,
|
|
Value stride) {
|
|
Type indexPtrTy = LLVM::LLVMPointerType::get(typeConverter.getIndexType());
|
|
Value strideStoreGep = builder.create<LLVM::GEPOp>(
|
|
loc, indexPtrTy, strideBasePtr, ValueRange({index}));
|
|
return builder.create<LLVM::LoadOp>(loc, strideStoreGep);
|
|
}
|
|
|
|
void UnrankedMemRefDescriptor::setStride(OpBuilder &builder, Location loc,
|
|
LLVMTypeConverter &typeConverter,
|
|
Value strideBasePtr, Value index,
|
|
Value stride) {
|
|
Type indexPtrTy = LLVM::LLVMPointerType::get(typeConverter.getIndexType());
|
|
Value strideStoreGep = builder.create<LLVM::GEPOp>(
|
|
loc, indexPtrTy, strideBasePtr, ValueRange({index}));
|
|
builder.create<LLVM::StoreOp>(loc, stride, strideStoreGep);
|
|
}
|