derek.holloway
7502bf64a4
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45 lines
1.2 KiB
LLVM
45 lines
1.2 KiB
LLVM
; RUN: opt < %s -passes=loop-interchange -pass-remarks-output=%t \
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; RUN: -disable-output
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; RUN: FileCheck -input-file %t %s
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; Check that loop interchange bails out early when finding a direction vector
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; with all '*' elements.
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;
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; for (int i = 0; i < 4; i++)
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; for (int j = 0; j < 4; j++)
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; A[i & val][j & val] = 0;
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; CHECK: --- !Missed
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; CHECK-NEXT: Pass: loop-interchange
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; CHECK-NEXT: Name: Dependence
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; CHECK-NEXT: Function: f
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; CHECK-NEXT: Args:
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; CHECK-NEXT: - String: All loops have dependencies in all directions.
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; CHECK-NEXT: ...
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define void @f(ptr %A, i64 %val) {
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entry:
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br label %for.i.header
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for.i.header:
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%i = phi i64 [ 0, %entry ], [ %i.next, %for.i.latch ]
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br label %for.j
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for.j:
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%j = phi i64 [ 0, %for.i.header ], [ %j.next, %for.j ]
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%subscript.0 = and i64 %i, %val
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%subscript.1 = and i64 %j, %val
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%idx = getelementptr inbounds [4 x i8], ptr %A, i64 %subscript.0, i64 %subscript.1
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store i8 0, ptr %idx
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%j.next = add nuw nsw i64 %j, 1
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%exit.j = icmp eq i64 %j.next, 4
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br i1 %exit.j, label %for.i.latch, label %for.j
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for.i.latch:
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%i.next = add nuw nsw i64 %i, 1
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%exit.i = icmp eq i64 %i.next, 4
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br i1 %exit.i, label %exit, label %for.i.header
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exit:
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ret void
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}
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