[llvm] [RISCV] Remove mfd and mpd CSR names for SiFive. (PR #75392)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-risc-v

Author: Craig Topper (topperc)

<details>
<summary>Changes</summary>

These names do not appear in the spec that was referenced for their addition. They appear to have been made up for LLVM.

These also don't belong to Xsfcie which is not an official SiFive extension name and appears to have been made up for LLVM too.

I made a big mistake in approving the original patches.

There are no official names defined currently. I'm willing to help get names defined, but only if the names are really needed.

---
Full diff: https://github.com/llvm/llvm-project/pull/75392.diff


1 Files Affected:

- (modified) llvm/lib/Target/RISCV/RISCVSystemOperands.td (-2) 


``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVSystemOperands.td b/llvm/lib/Target/RISCV/RISCVSystemOperands.td
index 953df7b15e2f6c..cf721fc80cb5f4 100644
--- a/llvm/lib/Target/RISCV/RISCVSystemOperands.td
+++ b/llvm/lib/Target/RISCV/RISCVSystemOperands.td
@@ -332,8 +332,6 @@ def : SiFiveReg<"mnepc", 0x351>;
 def : SiFiveReg<"mncause", 0x352>;
 def : SiFiveReg<"mnstatus", 0x353>;
 def : SiFiveReg<"mbpm", 0x7C0>;
-def : SiFiveReg<"mfd", 0x7C1>;
-def : SiFiveReg<"mpd", 0x7C8>;
 }
 
 //===----------------------------------------------------------------------===//

``````````

</details>


https://github.com/llvm/llvm-project/pull/75392