commit 1be9b9f81694617edd85e28f03cab07b3864f7e1
author Changpeng Fang <changpeng.fang@gmail.com> Thu Mar 09 00:07:00 2017 +0000
committer Changpeng Fang <changpeng.fang@gmail.com> Thu Mar 09 00:07:00 2017 +0000
tree 7c3a14b6cc00daac79830b98d94f1f0c27d65fe4
parent 8537d9994dbd041da176059449d060f2f320fc1a

AMDGPU/SI: Disable unrolling in the loop vectorizer if the loop is not vectorized.

Reviewers:
  arsenm

Differential Revision:
  http://reviews.llvm.org/D30719

llvm-svn: 297328

llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp

diff --git a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
index a780a76..4a6d12b 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUTargetTransformInfo.cpp
@@ -155,6 +155,10 @@
 }
 
 unsigned AMDGPUTTIImpl::getMaxInterleaveFactor(unsigned VF) {
+  // Disable unrolling if the loop is not vectorized.
+  if (VF == 1)
+    return 1;
+
   // Semi-arbitrary large amount.
   return 64;
 }