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Jeffrey Yasskin volunteered to benchmark the vectorizer on -O2 or -Os when compiling chrome. This patch adds a new flag to enable vectorization on all levels and not only on -O3. It should go away once we make a decision.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@183456 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nadav Rotem 2013-06-06 22:35:47 +00:00
parent babfebb4e8
commit 9342b9ccdd
1 changed files with 7 additions and 1 deletions
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8
lib/Transforms/IPO/PassManagerBuilder.cpp
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@ -32,6 +32,12 @@ static cl::opt<bool>
RunLoopVectorization("vectorize-loops",
cl::desc("Run the Loop vectorization passes"));
// This is a helper flag that we use for testing the profitability of
// vectorization on -O2 and -Os. It should go away once we make a decision.
static cl::opt<bool>
VectorizeO2("vectorize-o2",
cl::desc("Enable vectorization on all O levels"));
static cl::opt<bool>
RunSLPVectorization("vectorize-slp",
cl::desc("Run the SLP vectorization passes"));
@ -192,7 +198,7 @@ void PassManagerBuilder::populateModulePassManager(PassManagerBase &MPM) {
MPM.add(createLoopIdiomPass()); // Recognize idioms like memset.
MPM.add(createLoopDeletionPass()); // Delete dead loops
if (LoopVectorize && OptLevel > 2)
if (LoopVectorize && (OptLevel > 2 || VectorizeO2))
MPM.add(createLoopVectorizePass());
if (!DisableUnrollLoops)