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e101271f21
This is a simple implementation of the unroll-and-jam classical loop
optimisation.
The basic idea is that we take an outer loop of the form:
for i..
ForeBlocks(i)
for j..
SubLoopBlocks(i, j)
AftBlocks(i)
Instead of doing normal inner or outer unrolling, we unroll as follows:
for i... i+=2
ForeBlocks(i)
ForeBlocks(i+1)
for j..
SubLoopBlocks(i, j)
SubLoopBlocks(i+1, j)
AftBlocks(i)
AftBlocks(i+1)
Remainder Loop
So we have unrolled the outer loop, then jammed the two inner loops into
one. This can lead to a simpler inner loop if memory accesses can be shared
between the now jammed loops.
To do this we have to prove that this is all safe, both for the memory
accesses (using dependence analysis) and that ForeBlocks(i+1) can move before
AftBlocks(i) and SubLoopBlocks(i, j).
Differential Revision: https://reviews.llvm.org/D41953
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@336062 91177308-0d34-0410-b5e6-96231b3b80d8
165 lines
6.0 KiB
C++
165 lines
6.0 KiB
C++
/*===-- Scalar.h - Scalar Transformation Library C Interface ----*- C++ -*-===*\
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|* *|
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|* The LLVM Compiler Infrastructure *|
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|* *|
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|* This file is distributed under the University of Illinois Open Source *|
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|* License. See LICENSE.TXT for details. *|
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|* *|
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|*===----------------------------------------------------------------------===*|
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|* *|
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|* This header declares the C interface to libLLVMScalarOpts.a, which *|
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|* implements various scalar transformations of the LLVM IR. *|
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|* *|
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|* Many exotic languages can interoperate with C code but have a harder time *|
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|* with C++ due to name mangling. So in addition to C, this interface enables *|
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|* tools written in such languages. *|
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|* *|
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\*===----------------------------------------------------------------------===*/
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#ifndef LLVM_C_TRANSFORMS_SCALAR_H
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#define LLVM_C_TRANSFORMS_SCALAR_H
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#include "llvm-c/Types.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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/**
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* @defgroup LLVMCTransformsScalar Scalar transformations
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* @ingroup LLVMCTransforms
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*
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* @{
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*/
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/** See llvm::createAggressiveDCEPass function. */
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void LLVMAddAggressiveDCEPass(LLVMPassManagerRef PM);
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/** See llvm::createAggressiveInstCombinerPass function. */
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void LLVMAddAggressiveInstCombinerPass(LLVMPassManagerRef PM);
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/** See llvm::createBitTrackingDCEPass function. */
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void LLVMAddBitTrackingDCEPass(LLVMPassManagerRef PM);
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/** See llvm::createAlignmentFromAssumptionsPass function. */
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void LLVMAddAlignmentFromAssumptionsPass(LLVMPassManagerRef PM);
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/** See llvm::createCFGSimplificationPass function. */
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void LLVMAddCFGSimplificationPass(LLVMPassManagerRef PM);
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/** See llvm::createDeadStoreEliminationPass function. */
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void LLVMAddDeadStoreEliminationPass(LLVMPassManagerRef PM);
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/** See llvm::createScalarizerPass function. */
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void LLVMAddScalarizerPass(LLVMPassManagerRef PM);
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/** See llvm::createMergedLoadStoreMotionPass function. */
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void LLVMAddMergedLoadStoreMotionPass(LLVMPassManagerRef PM);
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/** See llvm::createGVNPass function. */
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void LLVMAddGVNPass(LLVMPassManagerRef PM);
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/** See llvm::createGVNPass function. */
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void LLVMAddNewGVNPass(LLVMPassManagerRef PM);
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/** See llvm::createIndVarSimplifyPass function. */
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void LLVMAddIndVarSimplifyPass(LLVMPassManagerRef PM);
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/** See llvm::createInstructionCombiningPass function. */
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void LLVMAddInstructionCombiningPass(LLVMPassManagerRef PM);
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/** See llvm::createJumpThreadingPass function. */
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void LLVMAddJumpThreadingPass(LLVMPassManagerRef PM);
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/** See llvm::createLICMPass function. */
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void LLVMAddLICMPass(LLVMPassManagerRef PM);
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/** See llvm::createLoopDeletionPass function. */
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void LLVMAddLoopDeletionPass(LLVMPassManagerRef PM);
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/** See llvm::createLoopIdiomPass function */
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void LLVMAddLoopIdiomPass(LLVMPassManagerRef PM);
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/** See llvm::createLoopRotatePass function. */
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void LLVMAddLoopRotatePass(LLVMPassManagerRef PM);
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/** See llvm::createLoopRerollPass function. */
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void LLVMAddLoopRerollPass(LLVMPassManagerRef PM);
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/** See llvm::createLoopUnrollPass function. */
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void LLVMAddLoopUnrollPass(LLVMPassManagerRef PM);
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/** See llvm::createLoopUnrollAndJamPass function. */
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void LLVMAddLoopUnrollAndJamPass(LLVMPassManagerRef PM);
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/** See llvm::createLoopUnswitchPass function. */
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void LLVMAddLoopUnswitchPass(LLVMPassManagerRef PM);
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/** See llvm::createMemCpyOptPass function. */
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void LLVMAddMemCpyOptPass(LLVMPassManagerRef PM);
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/** See llvm::createPartiallyInlineLibCallsPass function. */
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void LLVMAddPartiallyInlineLibCallsPass(LLVMPassManagerRef PM);
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/** See llvm::createReassociatePass function. */
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void LLVMAddReassociatePass(LLVMPassManagerRef PM);
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/** See llvm::createSCCPPass function. */
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void LLVMAddSCCPPass(LLVMPassManagerRef PM);
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/** See llvm::createSROAPass function. */
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void LLVMAddScalarReplAggregatesPass(LLVMPassManagerRef PM);
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/** See llvm::createSROAPass function. */
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void LLVMAddScalarReplAggregatesPassSSA(LLVMPassManagerRef PM);
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/** See llvm::createSROAPass function. */
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void LLVMAddScalarReplAggregatesPassWithThreshold(LLVMPassManagerRef PM,
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int Threshold);
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/** See llvm::createSimplifyLibCallsPass function. */
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void LLVMAddSimplifyLibCallsPass(LLVMPassManagerRef PM);
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/** See llvm::createTailCallEliminationPass function. */
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void LLVMAddTailCallEliminationPass(LLVMPassManagerRef PM);
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/** See llvm::createConstantPropagationPass function. */
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void LLVMAddConstantPropagationPass(LLVMPassManagerRef PM);
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/** See llvm::demotePromoteMemoryToRegisterPass function. */
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void LLVMAddDemoteMemoryToRegisterPass(LLVMPassManagerRef PM);
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/** See llvm::createVerifierPass function. */
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void LLVMAddVerifierPass(LLVMPassManagerRef PM);
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/** See llvm::createCorrelatedValuePropagationPass function */
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void LLVMAddCorrelatedValuePropagationPass(LLVMPassManagerRef PM);
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/** See llvm::createEarlyCSEPass function */
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void LLVMAddEarlyCSEPass(LLVMPassManagerRef PM);
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/** See llvm::createEarlyCSEPass function */
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void LLVMAddEarlyCSEMemSSAPass(LLVMPassManagerRef PM);
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/** See llvm::createLowerExpectIntrinsicPass function */
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void LLVMAddLowerExpectIntrinsicPass(LLVMPassManagerRef PM);
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/** See llvm::createTypeBasedAliasAnalysisPass function */
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void LLVMAddTypeBasedAliasAnalysisPass(LLVMPassManagerRef PM);
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/** See llvm::createScopedNoAliasAAPass function */
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void LLVMAddScopedNoAliasAAPass(LLVMPassManagerRef PM);
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/** See llvm::createBasicAliasAnalysisPass function */
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void LLVMAddBasicAliasAnalysisPass(LLVMPassManagerRef PM);
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/**
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* @}
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*/
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#ifdef __cplusplus
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}
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#endif /* defined(__cplusplus) */
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#endif
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