[LoopVectorize] Rename pass options. NFC.

Rename:
NoUnrolling to InterleaveOnlyWhenForced
and
AlwaysVectorize to !VectorizeOnlyWhenForced

Contrary to what the name 'AlwaysVectorize' suggests, it does not
unconditionally vectorize all loops, but applies a cost model to
determine whether vectorization is profitable to all loops. Hence,
passing false will disable the cost model, except when a loop is marked
with llvm.loop.vectorize.enable. The 'OnlyWhenForced' suffix (suggested
by @hfinkel in D55716) better matches this behavior.

Similarly, 'NoUnrolling' disables the profitability cost model for
interleaving (a term to distinguish it from unrolling by the
LoopUnrollPass); rename it for consistency.

Differential Revision: https://reviews.llvm.org/D55785

llvm-svn: 349513

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
index 268939e8247..60bd6def6ce 100644
--- a/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
+++ b/llvm/lib/Transforms/IPO/PassManagerBuilder.cpp
@@ -637,7 +637,7 @@ void PassManagerBuilder::populateModulePassManager(
   // llvm.loop.distribute=true or when -enable-loop-distribute is specified.
   MPM.add(createLoopDistributePass());
 
-  MPM.add(createLoopVectorizePass(DisableUnrollLoops, LoopVectorize));
+  MPM.add(createLoopVectorizePass(DisableUnrollLoops, !LoopVectorize));
 
   // Eliminate loads by forwarding stores from the previous iteration to loads
   // of the current iteration.
@@ -875,7 +875,7 @@ void PassManagerBuilder::addLTOOptimizationPasses(legacy::PassManagerBase &PM) {
 
   PM.add(createSimpleLoopUnrollPass(OptLevel,
                                     DisableUnrollLoops)); // Unroll small loops
-  PM.add(createLoopVectorizePass(true, LoopVectorize));
+  PM.add(createLoopVectorizePass(true, !LoopVectorize));
   // The vectorizer may have significantly shortened a loop body; unroll again.
   PM.add(createLoopUnrollPass(OptLevel, DisableUnrollLoops));