23 lines
1.1 KiB
Diff
23 lines
1.1 KiB
Diff
Pull in r222562 from upstream llvm trunk (by Roman Divacky):
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Disable header duplication at -Oz in loop-rotate pass.
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This helps to minimize the size of boot2.
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Introduced here: http://svnweb.freebsd.org/changeset/base/274968
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Index: lib/Transforms/IPO/PassManagerBuilder.cpp
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===================================================================
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--- lib/Transforms/IPO/PassManagerBuilder.cpp
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+++ lib/Transforms/IPO/PassManagerBuilder.cpp
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@@ -195,7 +195,8 @@ void PassManagerBuilder::populateModulePassManager
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MPM.add(createTailCallEliminationPass()); // Eliminate tail calls
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MPM.add(createCFGSimplificationPass()); // Merge & remove BBs
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MPM.add(createReassociatePass()); // Reassociate expressions
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- MPM.add(createLoopRotatePass()); // Rotate Loop
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+ // Rotate Loop - disable header duplication at -Oz
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+ MPM.add(createLoopRotatePass(SizeLevel == 2 ? 0 : -1));
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MPM.add(createLICMPass()); // Hoist loop invariants
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MPM.add(createLoopUnswitchPass(SizeLevel || OptLevel < 3));
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MPM.add(createInstructionCombiningPass());
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