[x86] use VPMOVMSK to replace memcmp libcalls for 32-byte equality

Follow-up to:
https://reviews.llvm.org/rL298775

llvm-svn: 298933

1 files changed, 8 insertions, 8 deletions

diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
index 25523e52af1..9a4d44842ea 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
@@ -6069,20 +6069,20 @@ bool SelectionDAGBuilder::visitMemCmpCall(const CallInst &I) {
   // supports the MVT we'll be loading or if it is small enough (<= 4) that
   // we'll only produce a small number of byte loads.
   MVT LoadVT;
-  switch (CSize->getZExtValue()) {
+  unsigned NumBitsToCompare = CSize->getZExtValue() * 8;
+  switch (NumBitsToCompare) {
   default:
     return false;
-  case 2:
+  case 16:
     LoadVT = MVT::i16;
     break;
-  case 4:
+  case 32:
     LoadVT = MVT::i32;
     break;
-  case 8:
-    LoadVT = hasFastLoadsAndCompare(64);
-    break;
-  case 16:
-    LoadVT = hasFastLoadsAndCompare(128);
+  case 64:
+  case 128:
+  case 256:
+    LoadVT = hasFastLoadsAndCompare(NumBitsToCompare);
     break;
   }