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https://git.hardenedbsd.org/hardenedbsd/HardenedBSD.git
synced 2024-12-23 10:06:25 +01:00
32 lines
1.3 KiB
Diff
32 lines
1.3 KiB
Diff
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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--- lib/Transforms/IPO/PassManagerBuilder.cpp
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+++ lib/Transforms/IPO/PassManagerBuilder.cpp
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@@ -57,6 +57,10 @@ static cl::opt<bool> RunLoadCombine("combine-loads
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cl::Hidden,
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cl::desc("Run the load combining pass"));
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+static cl::opt<bool> RunGVN("enable-gvn", cl::init(true),
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+ cl::Hidden,
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+ cl::desc("Run the global value numbering pass"));
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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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@@ -210,7 +214,8 @@ void PassManagerBuilder::populateModulePassManager
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if (OptLevel > 1) {
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MPM.add(createMergedLoadStoreMotionPass()); // Merge load/stores in diamond
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- MPM.add(createGVNPass()); // Remove redundancies
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+ if (RunGVN)
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+ MPM.add(createGVNPass()); // Remove redundancies
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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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