diff options
Diffstat (limited to 'contrib/llvm/patches/patch-04-add-llvm-gvn-option.diff')
| -rw-r--r-- | contrib/llvm/patches/patch-04-add-llvm-gvn-option.diff | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/contrib/llvm/patches/patch-04-add-llvm-gvn-option.diff b/contrib/llvm/patches/patch-04-add-llvm-gvn-option.diff new file mode 100644 index 0000000..5f31623 --- /dev/null +++ b/contrib/llvm/patches/patch-04-add-llvm-gvn-option.diff @@ -0,0 +1,31 @@ +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 ++++ lib/Transforms/IPO/PassManagerBuilder.cpp +@@ -78,6 +78,10 @@ static cl::opt<bool> + EnableMLSM("mlsm", cl::init(true), cl::Hidden, + cl::desc("Enable motion of merged load and store")); + ++static cl::opt<bool> EnableGVN("enable-gvn", ++ cl::init(true), cl::Hidden, ++ cl::desc("Run the global value numbering pass")); ++ + PassManagerBuilder::PassManagerBuilder() { + OptLevel = 2; + SizeLevel = 0; +@@ -244,7 +248,8 @@ void PassManagerBuilder::populateModulePassManager + if (OptLevel > 1) { + if (EnableMLSM) + MPM.add(createMergedLoadStoreMotionPass()); // Merge ld/st in diamonds +- MPM.add(createGVNPass(DisableGVNLoadPRE)); // Remove redundancies ++ if (EnableGVN) ++ MPM.add(createGVNPass(DisableGVNLoadPRE)); // Remove redundancies + } + MPM.add(createMemCpyOptPass()); // Remove memcpy / form memset + MPM.add(createSCCPPass()); // Constant prop with SCCP |
