Rotate Left/Right xarch instructions don't set ZF and ZF flag.

Commit migrated from https://github.com/dotnet/coreclr/commit/b82ba8b2940673d4ca61bc3407eb022e32153e5a

diff --git a/src/coreclr/src/jit/lowerxarch.cpp b/src/coreclr/src/jit/lowerxarch.cpp
index a98cc8e..e7af9f0 100644 (file)
--- a/src/coreclr/src/jit/lowerxarch.cpp
+++ b/src/coreclr/src/jit/lowerxarch.cpp
@@ -1176,8 +1176,12 @@ void Lowering::TreeNodeInfoInitShiftRotate(GenTree* tree)
         MakeSrcContained(tree, shiftBy);
     }
 
-    // Codegen of this tree node sets ZF and SF flags.
-    tree->gtFlags |= GTF_ZSF_SET;
+    // Codegen of shift oper sets ZF and SF flags.
+    // Note that Rotate Left/Right instructions don't set ZF and SF flags.
+    if (tree->OperIsShift())
+    {
+        tree->gtFlags |= GTF_ZSF_SET;
+    }
 }
 
 //------------------------------------------------------------------------