2014-11-24 18:43:37 +00:00
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Add an llvm option to enable/disable running the global value numbering
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optimization pass. Disabling this pass helps to minimize the size of
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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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2014-11-29 20:23:18 +00:00
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--- lib/Transforms/IPO/PassManagerBuilder.cpp
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+++ lib/Transforms/IPO/PassManagerBuilder.cpp
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2015-01-25 23:36:55 +00:00
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@@ -78,6 +78,10 @@ static cl::opt<bool>
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EnableMLSM("mlsm", cl::init(true), cl::Hidden,
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cl::desc("Enable motion of merged load and store"));
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2014-11-24 18:43:37 +00:00
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2015-01-25 23:36:55 +00:00
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+static cl::opt<bool> EnableGVN("enable-gvn",
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+ cl::init(true), cl::Hidden,
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+ cl::desc("Run the global value numbering pass"));
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2014-11-24 18:43:37 +00:00
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+
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PassManagerBuilder::PassManagerBuilder() {
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OptLevel = 2;
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SizeLevel = 0;
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2015-01-25 23:36:55 +00:00
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@@ -244,7 +248,8 @@ void PassManagerBuilder::populateModulePassManager
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2014-11-24 18:43:37 +00:00
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if (OptLevel > 1) {
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2015-01-25 23:36:55 +00:00
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if (EnableMLSM)
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MPM.add(createMergedLoadStoreMotionPass()); // Merge ld/st in diamonds
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- MPM.add(createGVNPass(DisableGVNLoadPRE)); // Remove redundancies
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+ if (EnableGVN)
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+ MPM.add(createGVNPass(DisableGVNLoadPRE)); // Remove redundancies
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2014-11-24 18:43:37 +00:00
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}
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MPM.add(createMemCpyOptPass()); // Remove memcpy / form memset
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MPM.add(createSCCPPass()); // Constant prop with SCCP
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