[llvm] [clang] [RISCV] Add MC layer support for Zicfiss. (PR #66043)

[Craig Topper via cfe-commits]

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@@ -1024,6 +1024,7 @@ static const char *ImpliedExtsZfinx[] = {"zicsr"};
 static const char *ImpliedExtsZhinx[] = {"zhinxmin"};
 static const char *ImpliedExtsZhinxmin[] = {"zfinx"};
 static const char *ImpliedExtsZicntr[] = {"zicsr"};
+static const char *ImpliedExtsZicfiss[] = {"zicsr", "zimop", "zcmop"};
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topperc wrote:

Ok I guess the spec does say that, but it seems weird. That would mean that there would be no need for sspush x1 if you can always use c.sspush x1. I'll file an issue on the spec.

https://github.com/llvm/llvm-project/pull/66043