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; RUN: opt -instsimplify -S < %s | FileCheck %s
; Test back to back reverse shuffles are eliminated.
define <vscale x 4 x i32> @shuffle_b2b_reverse(<vscale x 4 x i32> %a) {
; CHECK-LABEL: @shuffle_b2b_reverse(
; CHECK: ret <vscale x 4 x i32> %a
%rev = tail call <vscale x 4 x i32> @llvm.experimental.vector.reverse.nxv4i32(<vscale x 4 x i32> %a)
%rev.rev = tail call <vscale x 4 x i32> @llvm.experimental.vector.reverse.nxv4i32(<vscale x 4 x i32> %rev)
ret <vscale x 4 x i32> %rev.rev
}
; Test reverse of a splat is eliminated.
define <vscale x 4 x i32> @splat_reverse(i32 %a) {
; CHECK-LABEL: @splat_reverse(
; CHECK-NEXT: [[SPLAT_INSERT:%.*]] = insertelement <vscale x 4 x i32> poison, i32 [[A:%.*]], i32 0
; CHECK-NEXT: [[SPLAT:%.*]] = shufflevector <vscale x 4 x i32> [[SPLAT_INSERT]], <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
; CHECK-NEXT: ret <vscale x 4 x i32> [[SPLAT]]
;
%splat_insert = insertelement <vscale x 4 x i32> poison, i32 %a, i32 0
%splat = shufflevector <vscale x 4 x i32> %splat_insert, <vscale x 4 x i32> poison, <vscale x 4 x i32> zeroinitializer
%rev = tail call <vscale x 4 x i32> @llvm.experimental.vector.reverse.nxv4i32(<vscale x 4 x i32> %splat)
ret <vscale x 4 x i32> %rev
}
declare <vscale x 4 x i32> @llvm.experimental.vector.reverse.nxv4i32(<vscale x 4 x i32>)
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