[clang] [llvm] [RISCV] Assembler support for XRivosVizip (PR #127694)

[Philip Reames via llvm-commits]

================
@@ -202,6 +202,7 @@
 // CHECK-NEXT:     xqcilo               0.2       'Xqcilo' (Qualcomm uC Large Offset Load Store Extension)
 // CHECK-NEXT:     xqcilsm              0.2       'Xqcilsm' (Qualcomm uC Load Store Multiple Extension)
 // CHECK-NEXT:     xqcisls              0.2       'Xqcisls' (Qualcomm uC Scaled Load Store Extension)
+// CHECK-NEXT:     xrivosvizip          0.1       'XRivosVizip' (Rivos Vector Register Zips)
----------------
preames wrote:

As noted in my original comment, there is no existing consistency.  Ventana and THead both use vendor name in the extension name, not the instruction mnemonic prefix.  Examples:
```
$ fgrep ventana test/Driver/print-supported-extensions-riscv.c
// CHECK-NEXT:     xventanacondops      1.0       'XVentanaCondOps' (Ventana Conditional Ops)
$ fgrep thead /test/Driver/print-supported-extensions-riscv.c 
// CHECK-NEXT:     xtheadba             1.0       'XTHeadBa' (T-Head address calculation instructions)
// CHECK-NEXT:     xtheadbb             1.0       'XTHeadBb' (T-Head basic bit-manipulation instructions)
// CHECK-NEXT:     xtheadbs             1.0       'XTHeadBs' (T-Head single-bit instructions)
// CHECK-NEXT:     xtheadcmo            1.0       'XTHeadCmo' (T-Head cache management instructions)
// CHECK-NEXT:     xtheadcondmov        1.0       'XTHeadCondMov' (T-Head conditional move instructions)
// CHECK-NEXT:     xtheadfmemidx        1.0       'XTHeadFMemIdx' (T-Head FP Indexed Memory Operations)
// CHECK-NEXT:     xtheadmac            1.0       'XTHeadMac' (T-Head Multiply-Accumulate Instructions)
// CHECK-NEXT:     xtheadmemidx         1.0       'XTHeadMemIdx' (T-Head Indexed Memory Operations)
// CHECK-NEXT:     xtheadmempair        1.0       'XTHeadMemPair' (T-Head two-GPR Memory Operations)
// CHECK-NEXT:     xtheadsync           1.0       'XTHeadSync' (T-Head multicore synchronization instructions)
// CHECK-NEXT:     xtheadvdot           1.0       'XTHeadVdot' (T-Head Vector Extensions for Dot)

```

https://github.com/llvm/llvm-project/pull/127694