| ; RUN: opt < %s -force-vector-interleave=1 -store-to-load-forwarding-conflict-detection=false -loop-vectorize -dce -instcombine -S | FileCheck %s |
| |
| target datalayout = "e-m:e-i64:64-i128:128-n32:64-S128" |
| target triple = "aarch64--linux-gnu" |
| |
| %struct.pair = type { i32, i32 } |
| |
| ; Check vectorization of interleaved access groups with positive dependence |
| ; distances. In this test, the maximum safe dependence distance for |
| ; vectorization is 16 bytes. Normally, this would lead to a maximum VF of 4. |
| ; However, for interleaved groups, the effective VF is VF * IF, where IF is the |
| ; interleave factor. Here, the maximum safe dependence distance is recomputed |
| ; as 16 / IF bytes, resulting in VF=2. Since IF=2, we should generate <4 x i32> |
| ; loads and stores instead of <8 x i32> accesses. |
| ; |
| ; Note: LAA's conflict detection optimization has to be disabled for this test |
| ; to be vectorized. |
| |
| ; struct pair { |
| ; int x; |
| ; int y; |
| ; }; |
| ; |
| ; void max_vf(struct pair *restrict p) { |
| ; for (int i = 0; i < 1000; i++) { |
| ; p[i + 2].x = p[i].x |
| ; p[i + 2].y = p[i].y |
| ; } |
| ; } |
| |
| ; CHECK-LABEL: @max_vf |
| ; CHECK: load <4 x i32> |
| ; CHECK: store <4 x i32> |
| |
| define void @max_vf(%struct.pair* noalias nocapture %p) { |
| entry: |
| br label %for.body |
| |
| for.body: |
| %i = phi i64 [ 0, %entry ], [ %i.next, %for.body ] |
| %0 = add nuw nsw i64 %i, 2 |
| %p_i.x = getelementptr inbounds %struct.pair, %struct.pair* %p, i64 %i, i32 0 |
| %p_i_plus_2.x = getelementptr inbounds %struct.pair, %struct.pair* %p, i64 %0, i32 0 |
| %1 = load i32, i32* %p_i.x, align 4 |
| store i32 %1, i32* %p_i_plus_2.x, align 4 |
| %p_i.y = getelementptr inbounds %struct.pair, %struct.pair* %p, i64 %i, i32 1 |
| %p_i_plus_2.y = getelementptr inbounds %struct.pair, %struct.pair* %p, i64 %0, i32 1 |
| %2 = load i32, i32* %p_i.y, align 4 |
| store i32 %2, i32* %p_i_plus_2.y, align 4 |
| %i.next = add nuw nsw i64 %i, 1 |
| %cond = icmp eq i64 %i.next, 1000 |
| br i1 %cond, label %for.exit, label %for.body |
| |
| for.exit: |
| ret void |
| } |