[llvm] [ARM] CMSE security mitigation on function arguments and returned values (PR #89944)

[Victor Campos via llvm-commits]

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@@ -4617,6 +4636,15 @@ SDValue ARMTargetLowering::LowerFormalArguments(
           (VA.getValVT() == MVT::f16 || VA.getValVT() == MVT::bf16))
         ArgValue = MoveToHPR(dl, DAG, VA.getLocVT(), VA.getValVT(), ArgValue);
 
+      // On CMSE Entry Functions, formal integer arguments whose bitwidth is
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vhscampos wrote:

The code above regarding SExt and ZExt seems to be dead as it is not code covered by the LLVM tests. The BCvt part is exercised when arguments are of floating-point type. So I believe we can leave it as it is.

https://github.com/llvm/llvm-project/pull/89944