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