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[FRONTEND][BACKEND] Added trans instruction; made flash attention bwd pass work (#943)

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This commit is contained in:
Philippe Tillet
2022-12-03 09:58:24 -08:00
committed by GitHub
parent 4d64589b22
commit 8edfe813a5
12 changed files with 310 additions and 143 deletions
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34
lib/Conversion/TritonGPUToLLVM/TritonGPUToLLVM.cpp
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@@ -2716,6 +2716,9 @@ public:
auto dstSharedLayout = dstTy.getEncoding().cast<SharedEncodingAttr>();
auto inOrd = srcBlockedLayout.getOrder();
auto outOrd = dstSharedLayout.getOrder();
if (inOrd != outOrd)
llvm_unreachable(
"blocked -> shared with different order not yet implemented");
unsigned inVec =
inOrd == outOrd ? srcBlockedLayout.getSizePerThread()[inOrd[0]] : 1;
unsigned outVec = dstSharedLayout.getVec();
@@ -2775,7 +2778,8 @@ public:
getMultiDimIndex<unsigned>(linearRepIdx, reps, inOrd);
for (unsigned linearWordIdx = 0; linearWordIdx < numWordsEachRep;
++linearWordIdx) {
// step 1: recover the multidim_index from the index of input_elements
// step 1: recover the multidim_index from the index of
// input_elements
auto multiDimWordIdx =
getMultiDimIndex<unsigned>(linearWordIdx, wordsInEachRep, inOrd);
SmallVector<Value> multiDimIdx(2);
@@ -3711,6 +3715,33 @@ DotOpConversion::convertFMADot(triton::DotOp op, OpAdaptor adaptor,
/// ====================== mma codegen end ============================
/// ====================== trans codegen begin ============================
struct TransOpConversion
: public ConvertTritonGPUOpToLLVMPattern<triton::TransOp> {
using ConvertTritonGPUOpToLLVMPattern<
triton::TransOp>::ConvertTritonGPUOpToLLVMPattern;
LogicalResult
matchAndRewrite(triton::TransOp op, OpAdaptor adaptor,
ConversionPatternRewriter &rewriter) const override {
Location loc = op->getLoc();
auto srcSmemObj =
getSharedMemoryObjectFromStruct(loc, adaptor.src(), rewriter);
SmallVector<Value> dstStrides = {srcSmemObj.strides[1],
srcSmemObj.strides[0]};
SmallVector<Value> dstOffsets = {srcSmemObj.offsets[1],
srcSmemObj.offsets[0]};
auto dstSmemObj =
SharedMemoryObject(srcSmemObj.base, dstStrides, dstOffsets);
auto retVal = getStructFromSharedMemoryObject(loc, dstSmemObj, rewriter);
rewriter.replaceOp(op, retVal);
return success();
}
};
/// ====================== trans codegen end ============================
Value convertSplatLikeOpWithMmaLayout(const MmaEncodingAttr &layout,
Type resType, Type elemType,
Value constVal,
@@ -4538,6 +4569,7 @@ void populateTritonToLLVMPatterns(mlir::LLVMTypeConverter &typeConverter,
patterns.add<ViewLikeOpConversion<triton::ExpandDimsOp>>(typeConverter,
benefit);
patterns.add<DotOpConversion>(typeConverter, allocation, smem, benefit);
patterns.add<TransOpConversion>(typeConverter, benefit);
patterns.add<PrintfOpConversion>(typeConverter, benefit);
}