[WarnMissedTransforms] Do not warn about already vectorized loops.
LoopVectorize adds llvm.loop.isvectorized, but leaves
llvm.loop.vectorize.enable. Do not consider such a loop for user-forced
vectorization since vectorization already happened -- by prioritizing
llvm.loop.isvectorized except for TM_SuppressedByUser.
Fixes http://llvm.org/PR40546
Differential Revision: https://reviews.llvm.org/D57542
llvm-svn: 353082
diff --git a/llvm/lib/Transforms/Utils/LoopUtils.cpp b/llvm/lib/Transforms/Utils/LoopUtils.cpp
index 54cb0fc..57af3d1 100644
--- a/llvm/lib/Transforms/Utils/LoopUtils.cpp
+++ b/llvm/lib/Transforms/Utils/LoopUtils.cpp
@@ -378,17 +378,17 @@
Optional<int> InterleaveCount =
getOptionalIntLoopAttribute(L, "llvm.loop.interleave.count");
- if (Enable == true) {
- // 'Forcing' vector width and interleave count to one effectively disables
- // this tranformation.
- if (VectorizeWidth == 1 && InterleaveCount == 1)
- return TM_SuppressedByUser;
- return TM_ForcedByUser;
- }
+ // 'Forcing' vector width and interleave count to one effectively disables
+ // this tranformation.
+ if (Enable == true && VectorizeWidth == 1 && InterleaveCount == 1)
+ return TM_SuppressedByUser;
if (getBooleanLoopAttribute(L, "llvm.loop.isvectorized"))
return TM_Disable;
+ if (Enable == true)
+ return TM_ForcedByUser;
+
if (VectorizeWidth == 1 && InterleaveCount == 1)
return TM_Disable;