[PATCH] D92985: [SystemZTTIImpl::getMinPrefetchStride] Allow some non-prefetched mem accesses.

[Jonas Paulsson via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG0c2d23933f06: [SystemZTTIImpl] Allow some non-prefetched accesses in getMinPrefetchStride(). (authored by jonpa).

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D92985/new/

https://reviews.llvm.org/D92985

Files:
  llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp


Index: llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp
===================================================================
--- llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp
+++ llvm/lib/Target/SystemZ/SystemZTargetTransformInfo.cpp
@@ -341,8 +341,8 @@
 
   // Emit prefetch instructions for smaller strides in cases where we think
   // the hardware prefetcher might not be able to keep up.
-  if (NumStridedMemAccesses > 32 &&
-      NumStridedMemAccesses == NumMemAccesses && !HasCall)
+  if (NumStridedMemAccesses > 32 && !HasCall &&
+      (NumMemAccesses - NumStridedMemAccesses) * 32 <= NumStridedMemAccesses)
     return 1;
 
   return ST->hasMiscellaneousExtensions3() ? 8192 : 2048;


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