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Add an llvm option to enable/disable running the global value numbering
optimization pass. Disabling this pass helps to minimize the size of
boot2.
Introduced here: http://svnweb.freebsd.org/changeset/base/274968
Index: lib/Transforms/IPO/PassManagerBuilder.cpp
===================================================================
--- lib/Transforms/IPO/PassManagerBuilder.cpp (revision 12)
+++ lib/Transforms/IPO/PassManagerBuilder.cpp (revision 13)
@@ -57,6 +57,10 @@ static cl::opt<bool> RunLoadCombine("combine-loads
cl::Hidden,
cl::desc("Run the load combining pass"));
+static cl::opt<bool> RunGVN("enable-gvn", cl::init(true),
+ cl::Hidden,
+ cl::desc("Run the global value numbering pass"));
+
PassManagerBuilder::PassManagerBuilder() {
OptLevel = 2;
SizeLevel = 0;
@@ -210,7 +214,8 @@ void PassManagerBuilder::populateModulePassManager
if (OptLevel > 1) {
MPM.add(createMergedLoadStoreMotionPass()); // Merge load/stores in diamond
- MPM.add(createGVNPass()); // Remove redundancies
+ if (RunGVN)
+ MPM.add(createGVNPass()); // Remove redundancies
}
MPM.add(createMemCpyOptPass()); // Remove memcpy / form memset
MPM.add(createSCCPPass()); // Constant prop with SCCP
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