derek.holloway
7502bf64a4
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40 lines
1.6 KiB
LLVM
40 lines
1.6 KiB
LLVM
; RUN: opt -passes='loop(loop-rotate),print<access-info>' -S %s 2>&1 | FileCheck %s
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; RUN: opt -passes='loop(loop-rotate),invalidate<loops>,print<access-info>' -S %s 2>&1 | FileCheck %s
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; Make sure that the result of analysis is consistent regardless of blocks
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; order as they are stored in loop. This test demonstrates the situation when
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; recomputation of LI produces loop with different blocks order, and LA gives
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; a different result for it. The reason of this bug hasn't been found yet, but
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; the algorithm is somehow dependent on blocks order.
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define void @test_01(ptr %p) {
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; CHECK-LABEL: test_01
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; CHECK: Report: unsafe dependent memory operations in loop.
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; CHECK-NOT: Memory dependences are safe
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entry:
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br label %loop
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loop.progress: ; preds = %loop
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br label %loop.backedge
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loop.backedge: ; preds = %loop.progress
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store i32 1, ptr %tmp7, align 4
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%tmp = add nuw i64 %tmp5, 1
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%tmp3 = icmp ult i64 %tmp, 1000
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br i1 %tmp3, label %loop, label %exit
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loop: ; preds = %loop.backedge, %entry
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%tmp5 = phi i64 [ %tmp, %loop.backedge ], [ 16, %entry ]
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%tmp6 = phi i64 [ %tmp5, %loop.backedge ], [ 15, %entry ]
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%tmp7 = getelementptr inbounds i32, ptr %p, i64 %tmp5
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%tmp8 = load i32, ptr %tmp7, align 4
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%tmp9 = add i32 %tmp8, -5
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store i32 %tmp9, ptr %tmp7, align 4
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br i1 false, label %never, label %loop.progress
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never: ; preds = %loop
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unreachable
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exit: ; preds = %loop.backedge
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ret void
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}
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