Precommit test

Author: lukel97

llvm/test/CodeGen/RISCV/rvv/vp-reverse-loop.ll

@@ -0,0 +1,47 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 5
+; RUN: llc -mtriple=riscv64 -mattr=+m,+v -verify-machineinstrs < %s | FileCheck %s
+
+define void @reverse(ptr %p) {
+; CHECK-LABEL: reverse:
+; CHECK:       # %bb.0: # %entry
+; CHECK-NEXT:    li a1, 0
+; CHECK-NEXT:    li a2, 1024
+; CHECK-NEXT:  .LBB0_1: # %loop
+; CHECK-NEXT:    # =>This Inner Loop Header: Depth=1
+; CHECK-NEXT:    sub a3, a2, a1
+; CHECK-NEXT:    slli a4, a1, 3
+; CHECK-NEXT:    vsetvli a3, a3, e64, m1, ta, ma
+; CHECK-NEXT:    add a4, a0, a4
+; CHECK-NEXT:    vle64.v v8, (a4)
+; CHECK-NEXT:    addi a5, a3, -1
+; CHECK-NEXT:    vid.v v9
+; CHECK-NEXT:    vrsub.vx v9, v9, a5
+; CHECK-NEXT:    vrgather.vv v10, v8, v9
+; CHECK-NEXT:    add a1, a1, a3
+; CHECK-NEXT:    vse64.v v10, (a4)
+; CHECK-NEXT:    bltu a1, a2, .LBB0_1
+; CHECK-NEXT:  # %bb.2: # %exit
+; CHECK-NEXT:    ret
+entry:
+  br label %loop
+loop:
+  %iv = phi i64 [ 0, %entry ], [ %iv.next, %loop ]
+
+  %cnt = sub i64 1024, %iv
+  %evl = call i32 @llvm.experimental.get.vector.length(i64 %cnt, i32 1, i1 true)
+
+  %p.gep = getelementptr i64, ptr %p, i64 %iv
+  %v = call <vscale x 1 x i64> @llvm.vp.load(ptr %p.gep, <vscale x 1 x i1> splat (i1 true), i32 %evl)
+
+  %w = call <vscale x 1 x i64> @llvm.experimental.vp.reverse(<vscale x 1 x i64> %v, <vscale x 1 x i1> splat (i1 true), i32 %evl)
+
+  call void @llvm.vp.store(<vscale x 1 x i64> %w, ptr %p.gep, <vscale x 1 x i1> splat (i1 true), i32 %evl)
+
+  %evl.zext = zext i32 %evl to i64
+  %iv.next = add i64 %iv, %evl.zext
+  %done = icmp uge i64 %iv.next, 1024
+  br i1 %done, label %exit, label %loop
+
+exit:
+  ret void
+}