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Add an extension point for peephole optimizers.

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This extension point allows adding passes that perform peephole optimizations
similar to the instruction combiner. These passes will be inserted after
each instance of the instruction combiner pass.

Differential Revision: http://reviews.llvm.org/D3905

llvm-svn: 209595
This commit is contained in:
Peter Collingbourne 2014-05-25 10:27:02 +00:00
parent d34e8f3c43
commit e368465e8d
2 changed files with 15 additions and 1 deletions
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7
include/llvm/Transforms/IPO/PassManagerBuilder.h
View File

@ -86,7 +86,12 @@ public:
/// EP_EnabledOnOptLevel0 - This extension point allows adding passes that
/// should not be disabled by O0 optimization level. The passes will be
/// inserted after the inlining pass.
EP_EnabledOnOptLevel0
EP_EnabledOnOptLevel0,
/// EP_Peephole - This extension point allows adding passes that perform
/// peephole optimizations similar to the instruction combiner. These passes
/// will be inserted after each instance of the instruction combiner pass.
EP_Peephole,
};
/// The Optimization Level - Specify the basic optimization level.

9
lib/Transforms/IPO/PassManagerBuilder.cpp
View File

@ -157,6 +157,7 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
MPM.add(createDeadArgEliminationPass()); // Dead argument elimination
MPM.add(createInstructionCombiningPass());// Clean up after IPCP & DAE
addExtensionsToPM(EP_Peephole, MPM);
MPM.add(createCFGSimplificationPass()); // Clean up after IPCP & DAE
}
@ -183,6 +184,7 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
MPM.add(createCorrelatedValuePropagationPass()); // Propagate conditionals
MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
MPM.add(createInstructionCombiningPass()); // Combine silly seq's
addExtensionsToPM(EP_Peephole, MPM);
if (!DisableTailCalls)
MPM.add(createTailCallEliminationPass()); // Eliminate tail calls
@ -208,6 +210,7 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
// Run instcombine after redundancy elimination to exploit opportunities
// opened up by them.
MPM.add(createInstructionCombiningPass());
addExtensionsToPM(EP_Peephole, MPM);
MPM.add(createJumpThreadingPass()); // Thread jumps
MPM.add(createCorrelatedValuePropagationPass());
MPM.add(createDeadStoreEliminationPass()); // Delete dead stores
@ -222,6 +225,7 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
if (BBVectorize) {
MPM.add(createBBVectorizePass());
MPM.add(createInstructionCombiningPass());
addExtensionsToPM(EP_Peephole, MPM);
if (OptLevel > 1 && UseGVNAfterVectorization)
MPM.add(createGVNPass()); // Remove redundancies
else
@ -235,6 +239,7 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
MPM.add(createAggressiveDCEPass()); // Delete dead instructions
MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
MPM.add(createInstructionCombiningPass()); // Clean up after everything.
addExtensionsToPM(EP_Peephole, MPM);
// FIXME: This is a HACK! The inliner pass above implicitly creates a CGSCC
// pass manager that we are specifically trying to avoid. To prevent this
@ -247,6 +252,7 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
// as function calls, so that we can only pass them when the vectorizer
// changed the code.
MPM.add(createInstructionCombiningPass());
addExtensionsToPM(EP_Peephole, MPM);
MPM.add(createCFGSimplificationPass());
if (!DisableUnrollLoops)
@ -299,6 +305,7 @@ void PassManagerBuilder::populateLTOPassManager(PassManagerBase &PM,
// function pointers. When this happens, we often have to resolve varargs
// calls, etc, so let instcombine do this.
PM.add(createInstructionCombiningPass());
addExtensionsToPM(EP_Peephole, PM);
// Inline small functions
if (RunInliner)
@ -317,6 +324,7 @@ void PassManagerBuilder::populateLTOPassManager(PassManagerBase &PM,
// The IPO passes may leave cruft around. Clean up after them.
PM.add(createInstructionCombiningPass());
addExtensionsToPM(EP_Peephole, PM);
PM.add(createJumpThreadingPass());
// Break up allocas
@ -346,6 +354,7 @@ void PassManagerBuilder::populateLTOPassManager(PassManagerBase &PM,
// Cleanup and simplify the code after the scalar optimizations.
PM.add(createInstructionCombiningPass());
addExtensionsToPM(EP_Peephole, PM);
PM.add(createJumpThreadingPass());