Discard casts when storing normalize-on-load locals (#66389)

dotnet · Apr 17, 2022 · 0f8dd11 · 0f8dd11
1 parent d81ac24
commit 0f8dd11
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/src/coreclr/jit/morph.cpp b/src/coreclr/jit/morph.cpp
@@ -11619,7 +11619,10 @@ GenTree* Compiler::fgMorphSmpOp(GenTree* tree, MorphAddrContext* mac)
             effectiveOp1 = op1->gtEffectiveVal();
 
             // If we are storing a small type, we might be able to omit a cast.
-            if (effectiveOp1->OperIs(GT_IND, GT_CLS_VAR) && varTypeIsSmall(effectiveOp1))
+            if ((effectiveOp1->OperIs(GT_IND, GT_CLS_VAR) ||
+                 (effectiveOp1->OperIs(GT_LCL_VAR) &&
+                  lvaGetDesc(effectiveOp1->AsLclVarCommon()->GetLclNum())->lvNormalizeOnLoad())) &&
+                varTypeIsSmall(effectiveOp1))
             {
                 if (!gtIsActiveCSE_Candidate(op2) && op2->OperIs(GT_CAST) &&
                     varTypeIsIntegral(op2->AsCast()->CastOp()) && !op2->gtOverflow())