xref: /llvm-project/llvm/test/Transforms/InstSimplify/named-vector-shuffle-reverse.ll (revision bfc0317153dca75137fba00b5c28758d6f720963) 
1; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
2; RUN: opt -passes=instsimplify -S < %s | FileCheck %s
3
4; Test back to back reverse shuffles are eliminated.
5define <vscale x 4 x i32> @shuffle_b2b_reverse(<vscale x 4 x i32> %a) {
6; CHECK-LABEL: @shuffle_b2b_reverse(
7; CHECK-NEXT:    ret <vscale x 4 x i32> [[A:%.*]]
8;
9  %rev = tail call <vscale x 4 x i32> @llvm.vector.reverse.nxv4i32(<vscale x 4 x i32> %a)
10  %rev.rev = tail call <vscale x 4 x i32> @llvm.vector.reverse.nxv4i32(<vscale x 4 x i32> %rev)
11  ret <vscale x 4 x i32> %rev.rev
12}
13
14; Test reverse of a splat is eliminated.
15define <vscale x 4 x i32> @splat_reverse(i32 %a) {
16; CHECK-LABEL: @splat_reverse(
17; CHECK-NEXT:    [[SPLAT_INSERT:%.*]] = insertelement <vscale x 4 x i32> poison, i32 [[A:%.*]], i32 0
18; CHECK-NEXT:    [[SPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[SPLAT_INSERT]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
19; CHECK-NEXT:    ret <vscale x 4 x i32> [[SPLAT]]
20;
21  %splat_insert = insertelement <vscale x 4 x i32> poison, i32 %a, i32 0
22  %splat = shufflevector <vscale x 4 x i32> %splat_insert, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
23  %rev = tail call <vscale x 4 x i32> @llvm.vector.reverse.nxv4i32(<vscale x 4 x i32> %splat)
24  ret <vscale x 4 x i32> %rev
25}
26
27declare <vscale x 4 x i32> @llvm.vector.reverse.nxv4i32(<vscale x 4 x i32>)
28