1; RUN: opt < %s -passes=loop-vectorize -prefer-predicate-over-epilogue=predicate-else-scalar-epilogue \ 2; RUN: -mtriple aarch64-unknown-linux-gnu -mattr=+sve -S | FileCheck %s 3 4define void @invariant_store_red_exit_is_phi(ptr %dst, ptr readonly %src, i64 %n) { 5; CHECK-LABEL: @invariant_store_red_exit_is_phi( 6; CHECK: vector.ph: 7; CHECK: %[[N_MINUS_VF:.*]] = sub i64 %n, %[[VSCALE_X_4:.*]] 8; CHECK: %[[CMP:.*]] = icmp ugt i64 %n, %[[VSCALE_X_4]] 9; CHECK: %[[N2:.*]] = select i1 %[[CMP]], i64 %[[N_MINUS_VF]], i64 0 10; CHECK: %[[ACTIVE_LANE_MASK_ENTRY:.*]] = call <vscale x 4 x i1> @llvm.get.active.lane.mask.nxv4i1.i64(i64 0, i64 %n) 11; CHECK: vector.body: 12; CHECK: %[[ACTIVE_LANE_MASK:.*]] = phi <vscale x 4 x i1> [ %[[ACTIVE_LANE_MASK_ENTRY]], %vector.ph ], [ %[[ACTIVE_LANE_MASK_NEXT:.*]], %vector.body ] 13; CHECK: %[[VEC_PHI:.*]] = phi <vscale x 4 x i32> [ zeroinitializer, %vector.ph ], [ %[[PREDPHI:.*]], %vector.body ] 14; CHECK: %[[LOAD:.*]] = call <vscale x 4 x i32> @llvm.masked.load.nxv4i32.p0 15; CHECK-NEXT: %[[ADD:.*]] = add <vscale x 4 x i32> %[[VEC_PHI]], %[[LOAD]] 16; CHECK-NEXT: %[[SELECT:.*]] = select <vscale x 4 x i1> %[[ACTIVE_LANE_MASK]], <vscale x 4 x i32> %[[ADD]], <vscale x 4 x i32> %[[VEC_PHI]] 17; CHECK: %[[ACTIVE_LANE_MASK_NEXT]] = call <vscale x 4 x i1> @llvm.get.active.lane.mask.nxv4i1.i64(i64 %{{.*}}, i64 %[[N2]]) 18; CHECK: middle.block: 19; CHECK-NEXT: %[[SUM:.*]] = call i32 @llvm.vector.reduce.add.nxv4i32(<vscale x 4 x i32> %[[SELECT]]) 20; CHECK-NEXT: store i32 %[[SUM]], ptr %dst, align 4 21entry: 22 br label %for.body 23 24for.body: ; preds = %entry, %for.inc 25 %red = phi i32 [ 0, %entry ], [ %storemerge, %for.body ] 26 %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ] 27 %arrayidx6 = getelementptr inbounds i32, ptr %src, i64 %indvars.iv 28 %load = load i32, ptr %arrayidx6, align 4 29 %storemerge = add i32 %red, %load 30 store i32 %storemerge, ptr %dst, align 4 31 %indvars.iv.next = add nsw i64 %indvars.iv, 1 32 %exitcond.not = icmp eq i64 %indvars.iv.next, %n 33 br i1 %exitcond.not, label %for.end.loopexit, label %for.body, !llvm.loop !0 34 35for.end.loopexit: ; preds = %for.inc 36 br label %for.end 37 38for.end: ; preds = %for.end.loopexit 39 ret void 40} 41 42!0 = distinct !{!0, !1, !2, !3, !4} 43!1 = !{!"llvm.loop.vectorize.width", i32 4} 44!2 = !{!"llvm.loop.vectorize.scalable.enable", i1 true} 45!3 = !{!"llvm.loop.interleave.count", i32 1} 46!4 = !{!"llvm.loop.vectorize.enable", i1 true} 47