================
@@ -81,6 +81,15 @@ static bool DecodeAArch64Features(const Driver &D, StringRef 
text,
     else
       return false;
 
+    // +jsconv and +complxnum implies +neon and +fp-armv8
----------------
momchil-velikov wrote:

According to the latest Arm ARM 
(https://developer.arm.com/documentation/ddi0487/ja/?lang=en) the 
architecrtural extensions `FEAT_FCMA` and `FEAT_JSCVT` are mandatory in 
Armv8.3-a and are not optional in any architecture version.

For such features, our convention is to not expose them as command-line options.

https://github.com/llvm/llvm-project/pull/75516
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