Zero upper 4 bytes of the second operand of Vector3.Dot() in LowerHWI…

…ntrinsicDot() on Arm64 (#57328)
dotnet · Aug 13, 2021 · 134c25d · 134c25d
1 parent d67efc5
commit 134c25d
Showing 1 changed file with 11 additions and 0 deletions.
diff --git a/src/coreclr/jit/lowerarmarch.cpp b/src/coreclr/jit/lowerarmarch.cpp
@@ -1190,6 +1190,17 @@ void Lowering::LowerHWIntrinsicDot(GenTreeHWIntrinsic* node)
         op1 = comp->gtNewSimdAsHWIntrinsicNode(simdType, op1, idx, tmp1, NI_AdvSimd_Insert, simdBaseJitType, simdSize);
         BlockRange().InsertAfter(tmp1, op1);
         LowerNode(op1);
+
+        idx = comp->gtNewIconNode(0x03, TYP_INT);
+        BlockRange().InsertAfter(op2, idx);
+
+        tmp2 = comp->gtNewZeroConNode(TYP_FLOAT);
+        BlockRange().InsertAfter(idx, tmp2);
+        LowerNode(tmp2);
+
+        op2 = comp->gtNewSimdAsHWIntrinsicNode(simdType, op2, idx, tmp2, NI_AdvSimd_Insert, simdBaseJitType, simdSize);
+        BlockRange().InsertAfter(tmp2, op2);
+        LowerNode(op2);
     }
 
     // We will be constructing the following parts: