1 ; RUN: opt < %s -force-vector-interleave=1 -store-to-load-forwarding-conflict-detection=false -loop-vectorize -dce -instcombine -S | FileCheck %s 2 3 target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128" 4 target triple = "aarch64--linux-gnu" 5 6 %struct.pair = type { i32, i32 } 7 8 ; Check vectorization of interleaved access groups with positive dependence 9 ; distances. In this test, the maximum safe dependence distance for 10 ; vectorization is 16 bytes. Normally, this would lead to a maximum VF of 4. 11 ; However, for interleaved groups, the effective VF is VF * IF, where IF is the 12 ; interleave factor. Here, the maximum safe dependence distance is recomputed 13 ; as 16 / IF bytes, resulting in VF=2. Since IF=2, we should generate <4 x i32> 14 ; loads and stores instead of <8 x i32> accesses. 15 ; 16 ; Note: LAA's conflict detection optimization has to be disabled for this test 17 ; to be vectorized. 18 19 ; struct pair { 20 ; int x; 21 ; int y; 22 ; }; 23 ; 24 ; void max_vf(struct pair *restrict p) { 25 ; for (int i = 0; i < 1000; i++) { 26 ; p[i + 2].x = p[i].x 27 ; p[i + 2].y = p[i].y 28 ; } 29 ; } 30 31 ; CHECK-LABEL: @max_vf 32 ; CHECK: load <4 x i32> 33 ; CHECK: store <4 x i32> 34 35 define void @max_vf(%struct.pair* noalias nocapture %p) { 36 entry: 37 br label %for.body 38 39 for.body: 40 %i = phi i64 [ 0, %entry ], [ %i.next, %for.body ] 41 %0 = add nuw nsw i64 %i, 2 42 %p_i.x = getelementptr inbounds %struct.pair, %struct.pair* %p, i64 %i, i32 0 43 %p_i_plus_2.x = getelementptr inbounds %struct.pair, %struct.pair* %p, i64 %0, i32 0 44 %1 = load i32, i32* %p_i.x, align 4 45 store i32 %1, i32* %p_i_plus_2.x, align 4 46 %p_i.y = getelementptr inbounds %struct.pair, %struct.pair* %p, i64 %i, i32 1 47 %p_i_plus_2.y = getelementptr inbounds %struct.pair, %struct.pair* %p, i64 %0, i32 1 48 %2 = load i32, i32* %p_i.y, align 4 49 store i32 %2, i32* %p_i_plus_2.y, align 4 50 %i.next = add nuw nsw i64 %i, 1 51 %cond = icmp eq i64 %i.next, 1000 52 br i1 %cond, label %for.exit, label %for.body 53 54 for.exit: 55 ret void 56 } 57
