[RISCV][VLOPT] Enable VLOptimizer for vl-opt.ll test file

llvm/test/CodeGen/RISCV/rvv/vl-opt.ll

@@ -1,6 +1,12 @@
-; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 2
-; RUN: sed 's/iXLen/i32/g' %s | llc -mtriple=riscv32 -mattr=+v -verify-machineinstrs | FileCheck %s
-; RUN: sed 's/iXLen/i64/g' %s | llc -mtriple=riscv64 -mattr=+v -verify-machineinstrs | FileCheck %s
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: sed 's/iXLen/i32/g' %s | llc -mtriple=riscv32 -mattr=+v -verify-machineinstrs | \
+; RUN:   FileCheck %s -check-prefixes=CHECK,NOVLOPT
+; RUN: sed 's/iXLen/i64/g' %s | llc -mtriple=riscv64 -mattr=+v -verify-machineinstrs | \
+; RUN:   FileCheck %s -check-prefixes=CHECK,NOVLOPT
+; RUN: sed 's/iXLen/i32/g' %s | llc -mtriple=riscv32 -mattr=+v -riscv-enable-vl-optimizer \
+; RUN:   -verify-machineinstrs | FileCheck %s -check-prefixes=CHECK,VLOPT
+; RUN: sed 's/iXLen/i64/g' %s | llc -mtriple=riscv64 -mattr=+v -riscv-enable-vl-optimizer \
+; RUN:   -verify-machineinstrs | FileCheck %s -check-prefixes=CHECK,VLOPT
 
 declare <vscale x 4 x i32> @llvm.riscv.vadd.nxv4i32.nxv4i32(<vscale x 4 x i32>, <vscale x 4 x i32>, <vscale x 4 x i32>, iXLen)
 
@@ -104,3 +110,7 @@ define <vscale x 4 x i32> @different_imm_vl_with_tu(<vscale x 4 x i32> %passthru
   %w = call <vscale x 4 x i32> @llvm.riscv.vadd.nxv4i32.nxv4i32(<vscale x 4 x i32> %passthru, <vscale x 4 x i32> %v, <vscale x 4 x i32> %a,iXLen 4)
   ret <vscale x 4 x i32> %w
 }
+
+;; NOTE: These prefixes are unused and the list is autogenerated. Do not add tests below this line:
+; NOVLOPT: {{.*}}
+; VLOPT: {{.*}}