[llvm] [RISCV] Add custom lowering for fixed-vector `CLMUL`/`CLMULH` (PR #210429)

[Luke Lau via llvm-commits]

================
@@ -1,1795 +1,2909 @@
 ; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py
-; RUN: llc -mtriple=riscv32 -verify-machineinstrs -mattr=+v < %s | FileCheck %s --check-prefixes=CHECK,RV32
-; RUN: llc -mtriple=riscv64 -verify-machineinstrs -mattr=+v < %s | FileCheck %s --check-prefixes=CHECK,RV64
+; RUN: llc -mtriple=riscv32 -verify-machineinstrs -mattr=+v < %s | FileCheck %s --check-prefixes=CHECK,RV32,RV32V
+; RUN: llc -mtriple=riscv64 -verify-machineinstrs -mattr=+v < %s | FileCheck %s --check-prefixes=CHECK,RV64,RV64V
+; RUN: llc -mtriple=riscv32 -verify-machineinstrs -mattr=+v,+zvbc < %s | FileCheck %s --check-prefixes=CHECK,RV32,RV32ZVBC,RV32ZVBC64
+; RUN: llc -mtriple=riscv64 -verify-machineinstrs -mattr=+v,+zvbc < %s | FileCheck %s --check-prefixes=CHECK,RV64,RV64ZVBC,RV64ZVBC64
+; RUN: llc -mtriple=riscv32 -verify-machineinstrs -mattr=+v,+experimental-zvbc32e < %s | FileCheck %s --check-prefixes=CHECK,RV32,RV32ZVBC,RV32ZVBC32
+; RUN: llc -mtriple=riscv64 -verify-machineinstrs -mattr=+v,+experimental-zvbc32e < %s | FileCheck %s --check-prefixes=CHECK,RV64,RV64ZVBC,RV64ZVBC32
----------------
lukel97 wrote:

Most of these check prefixes are never used since they have conflicts. I would just keep the existing check lines untouched and only try to merge the rv32/rv64 pairs:

```suggestion
; RUN: llc -mtriple=riscv32 -verify-machineinstrs -mattr=+v < %s | FileCheck %s --check-prefixes=CHECK,RV32
; RUN: llc -mtriple=riscv64 -verify-machineinstrs -mattr=+v < %s | FileCheck %s --check-prefixes=CHECK,RV64
; RUN: llc -mtriple=riscv32 -verify-machineinstrs -mattr=+v,+zvbc < %s | FileCheck %s --check-prefixes=RVZVBC,RV32ZVBC
; RUN: llc -mtriple=riscv64 -verify-machineinstrs -mattr=+v,+zvbc < %s | FileCheck %s --check-prefixes=RVZVBC,RV64ZVBC
; RUN: llc -mtriple=riscv32 -verify-machineinstrs -mattr=+v,+experimental-zvbc32e < %s | FileCheck %s --check-prefixes=RVZVBC32,RV32ZVBC32
; RUN: llc -mtriple=riscv64 -verify-machineinstrs -mattr=+v,+experimental-zvbc32e < %s | FileCheck %s --check-prefixes=RVZVBC32,RV64ZVBC32
```

https://github.com/llvm/llvm-project/pull/210429