EmulateNarrowType.cpp File Reference

#include "mlir/Dialect/Affine/IR/AffineOps.h"
#include "mlir/Dialect/Arith/IR/Arith.h"
#include "mlir/Dialect/Arith/Transforms/NarrowTypeEmulationConverter.h"
#include "mlir/Dialect/Arith/Transforms/Passes.h"
#include "mlir/Dialect/Arith/Utils/Utils.h"
#include "mlir/Dialect/MemRef/IR/MemRef.h"
#include "mlir/Dialect/MemRef/Transforms/Transforms.h"
#include "mlir/Dialect/MemRef/Utils/MemRefUtils.h"
#include "mlir/Dialect/Vector/IR/VectorOps.h"
#include "mlir/IR/Builders.h"
#include "mlir/IR/BuiltinTypes.h"
#include "mlir/IR/OpDefinition.h"
#include "mlir/Support/LogicalResult.h"
#include "mlir/Support/MathExtras.h"
#include "mlir/Transforms/DialectConversion.h"
#include "llvm/Support/FormatVariadic.h"
#include <cassert>
#include <type_traits>

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Functions
template<typename MemRefOpTy >
static LogicalResult	convertCastingOp (ConversionPatternRewriter &rewriter, typename MemRefOpTy::Adaptor adaptor, MemRefOpTy op, MemRefType newTy)
	Converts a memref::SubViewOp or memref::ReinterpretCastOp to the converted type. More...
static Value	getOffsetForBitwidth (Location loc, OpFoldResult srcIdx, int sourceBits, int targetBits, OpBuilder &builder)
	When data is loaded/stored in targetBits granularity, but is used in sourceBits granularity (sourceBits < targetBits), the targetBits is treated as an array of elements of width sourceBits. More...
static Value	getSubByteWriteMask (Location loc, OpFoldResult linearizedIndices, int64_t srcBits, int64_t dstBits, Value bitwidthOffset, OpBuilder &builder)
	When writing a subbyte size, masked bitwise operations are used to only modify the relevant bits. More...
static Value	getIndicesForLoadOrStore (OpBuilder &builder, Location loc, OpFoldResult linearizedIndex, int64_t srcBits, int64_t dstBits)
	Returns the scaled linearized index based on the srcBits and dstBits sizes. More...
static OpFoldResult	getLinearizedSrcIndices (OpBuilder &builder, Location loc, int64_t srcBits, const SmallVector< OpFoldResult > &indices, Value memref)
static SmallVector< int64_t >	getLinearizedShape (MemRefType ty, int srcBits, int dstBits)

Function Documentation

convertCastingOp()

template<typename MemRefOpTy >

static LogicalResult convertCastingOp ( ConversionPatternRewriter &  rewriter, typename MemRefOpTy::Adaptor  adaptor, MemRefOpTy  op, MemRefType  newTy  )

static

Converts a memref::SubViewOp or memref::ReinterpretCastOp to the converted type.

The result MemRefType of the old op must have a rank and stride of 1, with static offset and size. The number of bits in the offset must evenly divide the bitwidth of the new converted type.

Definition at line 40 of file EmulateNarrowType.cpp.

getIndicesForLoadOrStore()

static Value getIndicesForLoadOrStore ( OpBuilder &  builder, Location  loc, OpFoldResult  linearizedIndex, int64_t  srcBits, int64_t  dstBits  )

static

Returns the scaled linearized index based on the srcBits and dstBits sizes.

The input linearizedIndex has the granularity of srcBits, and the returned index has the granularity of dstBits

Definition at line 136 of file EmulateNarrowType.cpp.

References mlir::bindSymbols(), mlir::AffineExpr::floorDiv(), mlir::Builder::getContext(), mlir::getValueOrCreateConstantIndexOp(), and mlir::affine::makeComposedFoldedAffineApply().

getLinearizedShape()

static SmallVector<int64_t> getLinearizedShape ( MemRefType  ty, int  srcBits, int  dstBits  )

static

Definition at line 478 of file EmulateNarrowType.cpp.

Referenced by mlir::memref::populateMemRefNarrowTypeEmulationConversions().

getLinearizedSrcIndices()

static OpFoldResult getLinearizedSrcIndices ( OpBuilder &  builder, Location  loc, int64_t  srcBits, const SmallVector< OpFoldResult > &  indices, Value  memref  )

static

Definition at line 148 of file EmulateNarrowType.cpp.

References mlir::OpBuilder::create(), and mlir::memref::getLinearizedMemRefOffsetAndSize().

getOffsetForBitwidth()

static Value getOffsetForBitwidth ( Location  loc, OpFoldResult  srcIdx, int  sourceBits, int  targetBits, OpBuilder &  builder  )

static

When data is loaded/stored in targetBits granularity, but is used in sourceBits granularity (sourceBits < targetBits), the targetBits is treated as an array of elements of width sourceBits.

Return the bit offset of the value at position srcIdx. For example, if sourceBits equals to 4 and targetBits equals to 8, the x-th element is located at (x % 2) * 4. Because there are two elements in one i8, and one element has 4 bits.

Definition at line 98 of file EmulateNarrowType.cpp.

References mlir::bindSymbols(), mlir::OpBuilder::create(), mlir::Builder::getContext(), mlir::Builder::getIntegerType(), mlir::getValueOrCreateConstantIndexOp(), and mlir::affine::makeComposedFoldedAffineApply().

getSubByteWriteMask()

static Value getSubByteWriteMask ( Location  loc, OpFoldResult  linearizedIndices, int64_t  srcBits, int64_t  dstBits, Value  bitwidthOffset, OpBuilder &  builder  )

static

When writing a subbyte size, masked bitwise operations are used to only modify the relevant bits.

This function returns an and mask for clearing the destination bits in a subbyte write. E.g., when writing to the second i4 in an i32, 0xFFFFFF0F is created.

Definition at line 117 of file EmulateNarrowType.cpp.

References mlir::OpBuilder::create(), mlir::Builder::getIntegerAttr(), and mlir::Builder::getIntegerType().