1; RUN: opt  -instsimplify -S < %s | FileCheck %s
2
3; Test back to back reverse shuffles are eliminated.
4define <vscale x 4 x i32> @shuffle_b2b_reverse(<vscale x 4 x i32> %a) {
5; CHECK-LABEL: @shuffle_b2b_reverse(
6; CHECK: ret <vscale x 4 x i32> %a
7  %rev = tail call <vscale x 4 x i32> @llvm.experimental.vector.reverse.nxv4i32(<vscale x 4 x i32> %a)
8  %rev.rev = tail call <vscale x 4 x i32> @llvm.experimental.vector.reverse.nxv4i32(<vscale x 4 x i32> %rev)
9  ret <vscale x 4 x i32> %rev.rev
10}
11
12; Test reverse of a splat is eliminated.
13define <vscale x 4 x i32> @splat_reverse(i32 %a) {
14; CHECK-LABEL: @splat_reverse(
15; CHECK-NEXT:    [[SPLAT_INSERT:%.*]] = insertelement <vscale x 4 x i32> poison, i32 [[A:%.*]], i32 0
16; CHECK-NEXT:    [[SPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[SPLAT_INSERT]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
17; CHECK-NEXT:    ret <vscale x 4 x i32> [[SPLAT]]
18;
19  %splat_insert = insertelement <vscale x 4 x i32> poison, i32 %a, i32 0
20  %splat = shufflevector <vscale x 4 x i32> %splat_insert, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
21  %rev = tail call <vscale x 4 x i32> @llvm.experimental.vector.reverse.nxv4i32(<vscale x 4 x i32> %splat)
22  ret <vscale x 4 x i32> %rev
23}
24
25declare <vscale x 4 x i32> @llvm.experimental.vector.reverse.nxv4i32(<vscale x 4 x i32>)
26