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If requested, apply function merging at -O0 too. It's useful there to reduce the time to compile.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220537 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nick Lewycky
2014-10-23 23:49:31 +00:00
parent da45b2bdbd
commit c08a7201b7
1 changed files with 10 additions and 6 deletions
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16
lib/Transforms/IPO/PassManagerBuilder.cpp
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@ -159,18 +159,22 @@ void PassManagerBuilder::populateFunctionPassManager(FunctionPassManager &FPM) {
} }
void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) { void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
// If all optimizations are disabled, just run the always-inline pass. // If all optimizations are disabled, just run the always-inline pass and,
// if enabled, the function merging pass.
if (OptLevel == 0) { if (OptLevel == 0) {
if (Inliner) { if (Inliner) {
MPM.add(Inliner); MPM.add(Inliner);
Inliner = nullptr; Inliner = nullptr;
} }
// FIXME: This is a HACK! The inliner pass above implicitly creates a CGSCC // FIXME: The BarrierNoopPass is a HACK! The inliner pass above implicitly
// pass manager, but we don't want to add extensions into that pass manager. // creates a CGSCC pass manager, but we don't want to add extensions into
// To prevent this we must insert a no-op module pass to reset the pass // that pass manager. To prevent this we insert a no-op module pass to reset
// manager to get the same behavior as EP_OptimizerLast in non-O0 builds. // the pass manager to get the same behavior as EP_OptimizerLast in non-O0
if (!GlobalExtensions->empty() || !Extensions.empty()) // builds. The function merging pass is
if (MergeFunctions)
MPM.add(createMergeFunctionsPass());
else if (!GlobalExtensions->empty() || !Extensions.empty())
MPM.add(createBarrierNoopPass()); MPM.add(createBarrierNoopPass());
addExtensionsToPM(EP_EnabledOnOptLevel0, MPM); addExtensionsToPM(EP_EnabledOnOptLevel0, MPM);