[PATCH] D80802: [RISCV] Upgrade RVV MC to v0.9.

[Ferran Pallarès Roca via Phabricator via cfe-commits]

fpallares added inline comments.


================
Comment at: llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp:2362
+  }
+  if (TargetFlags & RISCV::VMConstraint) {
+    // vadc, vsbc are special cases.
----------------
Given that this constraint has no effect when `DestReg != RISCV::V0`, we could simplify the logic by adding this to the condition:

```
​  if (TargetFlags & RISCV::VMConstraint && DestReg == RISCV::V0) {
```

Then the `DestReg` checks within the block can go away.


================
Comment at: llvm/lib/Target/RISCV/AsmParser/RISCVAsmParser.cpp:2386
+        CheckReg = Inst.getOperand(3).getReg();
     }
+    if (DestReg == CheckReg)
----------------
With the suggestion above, this could be further simplified to:

```
​    if ((TargetFlags & RISCV::OneInput && Inst.getNumOperands() == 3) || Inst.getNumOperands() == 4)
​      return Error(Loc, "The destination vector register group cannot overlap"
	​                        " the mask register.");
```


Repository:
  rG LLVM Github Monorepo

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  https://reviews.llvm.org/D80802/new/

https://reviews.llvm.org/D80802