Precommit tests

Author: lukel97

llvm/test/CodeGen/RISCV/rvv/rvv-peephole-vmerge-to-vmv.ll

@@ -0,0 +1,12 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc < %s -mtriple=riscv64 -mattr=+v -verify-machineinstrs | FileCheck %s
+
+define <vscale x 1 x i64> @undef_passthru(<vscale x 1 x i64> %false, <vscale x 1 x i64> %true, i64 %vl) {
+; CHECK-LABEL: undef_passthru:
+; CHECK:       # %bb.0:
+; CHECK-NEXT:    vsetvli zero, a0, e64, m1, tu, ma
+; CHECK-NEXT:    vmv.v.v v8, v9
+; CHECK-NEXT:    ret
+  %v = call <vscale x 1 x i64> @llvm.riscv.vmerge.nxv1i64.nxv1i64(<vscale x 1 x i64> poison, <vscale x 1 x i64> %false, <vscale x 1 x i64> %true, <vscale x 1 x i1> splat (i1 true), i64 %vl)
+  ret <vscale x 1 x i64> %v
+}

llvm/test/CodeGen/RISCV/rvv/vmv.v.v-peephole.mir

@@ -18,3 +18,17 @@ body: |
     %y:gpr = ADDI $x0, 1
     %z:vr = PseudoVMV_V_V_M1 %passthru, %x, 4, 5 /* e32 */, 0 /* tu, mu */
 ...
+---
+name: tail_agnostic
+body: |
+  bb.0:
+    liveins: $v8
+    ; CHECK-LABEL: name: tail_agnostic
+    ; CHECK: liveins: $v8
+    ; CHECK-NEXT: {{  $}}
+    ; CHECK-NEXT: %passthru:vr = COPY $v8
+    ; CHECK-NEXT: %x:vr = PseudoVADD_VV_M1 %passthru, $noreg, $noreg, 4, 5 /* e32 */, 0 /* tu, mu */
+    %passthru:vr = COPY $v8
+    %x:vr = PseudoVADD_VV_M1 %passthru, $noreg, $noreg, 4, 5 /* e32 */, 0 /* tu, mu */
+    %y:vr = PseudoVMV_V_V_M1 %passthru, %x, 4, 5 /* e32 */, 1 /* ta, mu */
+...