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This pass implements whole program optimization of virtual calls in cases where we know (via bitset information) that the list of callees is fixed. This includes the following: - Single implementation devirtualization: if a virtual call has a single possible callee, replace all calls with a direct call to that callee. - Virtual constant propagation: if the virtual function's return type is an integer <=64 bits and all possible callees are readnone, for each class and each list of constant arguments: evaluate the function, store the return value alongside the virtual table, and rewrite each virtual call as a load from the virtual table. - Uniform return value optimization: if the conditions for virtual constant propagation hold and each function returns the same constant value, replace each virtual call with that constant. - Unique return value optimization for i1 return values: if the conditions for virtual constant propagation hold and a single vtable's function returns 0, or a single vtable's function returns 1, replace each virtual call with a comparison of the vptr against that vtable's address. Differential Revision: http://reviews.llvm.org/D16795 llvm-svn: 260312
121 lines
3.8 KiB
C++
121 lines
3.8 KiB
C++
//===-- IPO.cpp -----------------------------------------------------------===//
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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 file implements the common infrastructure (including C bindings) for
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// libLLVMIPO.a, which implements several transformations over the LLVM
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// intermediate representation.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm-c/Initialization.h"
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#include "llvm-c/Transforms/IPO.h"
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#include "llvm/InitializePasses.h"
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#include "llvm/IR/LegacyPassManager.h"
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#include "llvm/Transforms/IPO.h"
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using namespace llvm;
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void llvm::initializeIPO(PassRegistry &Registry) {
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initializeArgPromotionPass(Registry);
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initializeConstantMergePass(Registry);
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initializeCrossDSOCFIPass(Registry);
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initializeDAEPass(Registry);
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initializeDAHPass(Registry);
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initializeForceFunctionAttrsLegacyPassPass(Registry);
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initializeGlobalDCEPass(Registry);
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initializeGlobalOptPass(Registry);
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initializeIPCPPass(Registry);
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initializeAlwaysInlinerPass(Registry);
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initializeSimpleInlinerPass(Registry);
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initializeInferFunctionAttrsLegacyPassPass(Registry);
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initializeInternalizePassPass(Registry);
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initializeLoopExtractorPass(Registry);
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initializeBlockExtractorPassPass(Registry);
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initializeSingleLoopExtractorPass(Registry);
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initializeLowerBitSetsPass(Registry);
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initializeMergeFunctionsPass(Registry);
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initializePartialInlinerPass(Registry);
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initializePostOrderFunctionAttrsPass(Registry);
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initializeReversePostOrderFunctionAttrsPass(Registry);
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initializePruneEHPass(Registry);
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initializeStripDeadPrototypesLegacyPassPass(Registry);
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initializeStripSymbolsPass(Registry);
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initializeStripDebugDeclarePass(Registry);
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initializeStripDeadDebugInfoPass(Registry);
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initializeStripNonDebugSymbolsPass(Registry);
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initializeBarrierNoopPass(Registry);
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initializeEliminateAvailableExternallyPass(Registry);
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initializeSampleProfileLoaderPass(Registry);
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initializeFunctionImportPassPass(Registry);
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initializeWholeProgramDevirtPass(Registry);
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}
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void LLVMInitializeIPO(LLVMPassRegistryRef R) {
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initializeIPO(*unwrap(R));
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}
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void LLVMAddArgumentPromotionPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createArgumentPromotionPass());
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}
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void LLVMAddConstantMergePass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createConstantMergePass());
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}
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void LLVMAddDeadArgEliminationPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createDeadArgEliminationPass());
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}
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void LLVMAddFunctionAttrsPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createPostOrderFunctionAttrsPass());
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}
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void LLVMAddFunctionInliningPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createFunctionInliningPass());
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}
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void LLVMAddAlwaysInlinerPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(llvm::createAlwaysInlinerPass());
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}
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void LLVMAddGlobalDCEPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createGlobalDCEPass());
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}
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void LLVMAddGlobalOptimizerPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createGlobalOptimizerPass());
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}
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void LLVMAddIPConstantPropagationPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createIPConstantPropagationPass());
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}
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void LLVMAddPruneEHPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createPruneEHPass());
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}
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void LLVMAddIPSCCPPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createIPSCCPPass());
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}
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void LLVMAddInternalizePass(LLVMPassManagerRef PM, unsigned AllButMain) {
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std::vector<const char *> Export;
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if (AllButMain)
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Export.push_back("main");
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unwrap(PM)->add(createInternalizePass(Export));
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}
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void LLVMAddStripDeadPrototypesPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createStripDeadPrototypesPass());
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}
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void LLVMAddStripSymbolsPass(LLVMPassManagerRef PM) {
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unwrap(PM)->add(createStripSymbolsPass());
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}
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