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Diffstat (limited to 'test/Analysis/LoopAccessAnalysis/independent-interleaved.ll')
-rw-r--r-- | test/Analysis/LoopAccessAnalysis/independent-interleaved.ll | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/test/Analysis/LoopAccessAnalysis/independent-interleaved.ll b/test/Analysis/LoopAccessAnalysis/independent-interleaved.ll new file mode 100644 index 000000000000..fe56ea9ab593 --- /dev/null +++ b/test/Analysis/LoopAccessAnalysis/independent-interleaved.ll @@ -0,0 +1,46 @@ +; RUN: opt < %s -store-to-load-forwarding-conflict-detection=false -loop-accesses -analyze | FileCheck %s +; RUN: opt -passes='require<scalar-evolution>,require<aa>,loop(print-access-info)' -store-to-load-forwarding-conflict-detection=false -disable-output < %s 2>&1 | FileCheck %s + +; This test checks that we prove the strided accesses to be independent before +; concluding that there is a forward dependence. + +; struct pair { +; int x; +; int y; +; }; +; +; int independent_interleaved(struct pair *p, int z, int n) { +; int s = 0; +; for (int i = 0; i < n; i++) { +; p[i].y = z; +; s += p[i].x; +; } +; return s; +; } + +; CHECK: for.body: +; CHECK-NOT: Forward: +; CHECK-NOT: store i32 %z, i32* %p_i.y, align 8 -> +; CHECK-NOT: %0 = load i32, i32* %p_i.x, align 8 + +%pair = type { i32, i32 } +define i32 @independent_interleaved(%pair *%p, i64 %n, i32 %z) { +entry: + br label %for.body + +for.body: + %i = phi i64 [ %i.next, %for.body ], [ 0, %entry ] + %s = phi i32 [ %1, %for.body ], [ 0, %entry ] + %p_i.x = getelementptr inbounds %pair, %pair* %p, i64 %i, i32 0 + %p_i.y = getelementptr inbounds %pair, %pair* %p, i64 %i, i32 1 + store i32 %z, i32* %p_i.y, align 8 + %0 = load i32, i32* %p_i.x, align 8 + %1 = add nsw i32 %0, %s + %i.next = add nuw nsw i64 %i, 1 + %cond = icmp slt i64 %i.next, %n + br i1 %cond, label %for.body, label %for.end + +for.end: + %2 = phi i32 [ %1, %for.body ] + ret i32 %2 +} |