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A DAG-NOT-DAG is a CHECK-DAG group, X, followed by a CHECK-NOT group,
N, followed by a CHECK-DAG group, Y. Let y be the initial directive
of Y. This patch makes the following changes to the behavior:
1. Directives in N can no longer match within part of Y's match
range just because y happens not to be the earliest match from
Y. Specifically, this patch withdraws N's search range end
from y's match range start to Y's match range start.
2. y can no longer match within X's match range, where a y match
produced a reordering complaint, which is thus no longer
possible. Specifically, this patch withdraws y's search range
start from X's permitted range start to X's match range end,
which was already the search range start for other members of
Y.
Both of these changes can only increase the number of test passes: #1
constrains the ability of CHECK-NOTs to match, and #2 expands the
ability of CHECK-DAGs to match without complaints.
These changes are based on discussions at:
<http://lists.llvm.org/pipermail/llvm-dev/2018-May/123550.html>
<https://reviews.llvm.org/D47106>
which conclude that:
1. These changes simplify the FileCheck conceptual model. First,
it makes search ranges for DAG-NOT-DAG more consistent with
other cases. Second, it was confusing that y was treated
differently from the rest of Y.
2. These changes add theoretical use cases for DAG-NOT-DAG that
had no obvious means to be expressed otherwise. We can justify
the first half of this assertion with the observation that
these changes can only increase the number of test passes.
3. Reordering detection for DAG-NOT-DAG had no obvious real
benefit.
We don't have evidence from real uses cases to help us debate
conclusions #2 and #3, but #1 at least seems intuitive.
Reviewed By: probinson
Differential Revision: https://reviews.llvm.org/D48986
llvm-svn: 337605
76 lines
1.9 KiB
Plaintext
76 lines
1.9 KiB
Plaintext
;---------------------------------------------------------------------
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; RUN: FileCheck -input-file %s %s -check-prefix=NotSearchEnd
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The search range for the NOTs used to end at the start of the match range for
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the first DAG in the following DAG group. Now it ends at the start of the
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match range for the entire following DAG group.
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__NotSearchEnd
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x0
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x1
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y1
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foobar
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y0
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z2
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foobar
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z1
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foobar
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z0
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__NotSearchEnd
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; NotSearchEnd: {{^}}__NotSearchEnd
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; NotSearchEnd-DAG: {{^}}x0
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; NotSearchEnd-DAG: {{^}}x1
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; NotSearchEnd-NOT: {{^}}foobar
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; NotSearchEnd-DAG: {{^}}y0
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; NotSearchEnd-DAG: {{^}}y1
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; NotSearchEnd-NOT: {{^}}foobar
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; NotSearchEnd-DAG: {{^}}z0
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; NotSearchEnd-DAG: {{^}}z1
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; NotSearchEnd-DAG: {{^}}z2
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; NotSearchEnd: {{^}}__NotSearchEnd
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;---------------------------------------------------------------------
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; RUN: FileCheck -input-file %s %s -check-prefix=Dag2SearchStart
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The start of the search range for the second or later DAG group used to be
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different for its first DAG than its other DAGs. For the first DAG, it was
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the start of the permitted range for the preceding DAG group, and there was a
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reordering complaint if the match range was in the first DAG group's match
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range. For the other DAGs, it was the end of the match range for the
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preceding DAG group, so reordering detection wasn't possible. Now, the
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first DAG behaves like the others, and so reordering detection is no longer
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implemented. As a result, matches that used to produce the reordering
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complaint are now skipped, permitting later matches to succeed.
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__Dag2SearchStart
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y0
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y1
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x0
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y0
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y1
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x1
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z1
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z0
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y1
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z1
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z0
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y0
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z0
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z1
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__Dag2SearchStart
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; Dag2SearchStart: {{^}}__Dag2SearchStart
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; Dag2SearchStart-DAG: {{^}}x0
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; Dag2SearchStart-DAG: {{^}}x1
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; Dag2SearchStart-NOT: {{^}}foobar
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; Dag2SearchStart-DAG: {{^}}y0
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; Dag2SearchStart-DAG: {{^}}y1
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; Dag2SearchStart-NOT: {{^}}foobar
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; Dag2SearchStart-DAG: {{^}}z0
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; Dag2SearchStart-DAG: {{^}}z1
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; Dag2SearchStart: {{^}}__Dag2SearchStart |