47 lines
1.4 KiB
LLVM
47 lines
1.4 KiB
LLVM
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; RUN: opt < %s -store-to-load-forwarding-conflict-detection=false -loop-accesses -analyze -enable-new-pm=0 | FileCheck %s
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; 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
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; This test checks that we prove the strided accesses to be independent before
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; concluding that there is a forward dependence.
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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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; int independent_interleaved(struct pair *p, int z, int n) {
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; int s = 0;
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; for (int i = 0; i < n; i++) {
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; p[i].y = z;
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; s += p[i].x;
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; }
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; return s;
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; }
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; CHECK: for.body:
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; CHECK-NOT: Forward:
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; CHECK-NOT: store i32 %z, i32* %p_i.y, align 8 ->
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; CHECK-NOT: %0 = load i32, i32* %p_i.x, align 8
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%pair = type { i32, i32 }
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define i32 @independent_interleaved(%pair *%p, i64 %n, i32 %z) {
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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 [ %i.next, %for.body ], [ 0, %entry ]
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%s = phi i32 [ %1, %for.body ], [ 0, %entry ]
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%p_i.x = getelementptr inbounds %pair, %pair* %p, i64 %i, i32 0
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%p_i.y = getelementptr inbounds %pair, %pair* %p, i64 %i, i32 1
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store i32 %z, i32* %p_i.y, align 8
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%0 = load i32, i32* %p_i.x, align 8
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%1 = add nsw i32 %0, %s
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%i.next = add nuw nsw i64 %i, 1
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%cond = icmp slt i64 %i.next, %n
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br i1 %cond, label %for.body, label %for.end
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for.end:
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%2 = phi i32 [ %1, %for.body ]
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ret i32 %2
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}
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