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IR: Add 'distinct' MDNodes to bitcode and assembly

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Propagate whether `MDNode`s are 'distinct' through the other types of IR
(assembly and bitcode).  This adds the `distinct` keyword to assembly.

Currently, no one actually calls `MDNode::getDistinct()`, so these nodes
only get created for:

  - self-references, which are never uniqued, and
  - nodes whose operands are replaced that hit a uniquing collision.

The concept of distinct nodes is still not quite first-class, since
distinct-ness doesn't yet survive across `MapMetadata()`.

Part of PR22111.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225474 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2015-01-08 22:38:29 +00:00
parent 1cbba214c7
commit f416d72973
20 changed files with 110 additions and 54 deletions
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10
test/Transforms/Inline/noalias.ll
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@@ -65,12 +65,12 @@ entry:
attributes #0 = { nounwind uwtable }
; CHECK: !0 = !{!1}
; CHECK: !1 = !{!1, !2, !"hello: %a"}
; CHECK: !2 = !{!2, !"hello"}
; CHECK: !1 = distinct !{!1, !2, !"hello: %a"}
; CHECK: !2 = distinct !{!2, !"hello"}
; CHECK: !3 = !{!4, !6}
; CHECK: !4 = !{!4, !5, !"hello2: %a"}
; CHECK: !5 = !{!5, !"hello2"}
; CHECK: !6 = !{!6, !5, !"hello2: %b"}
; CHECK: !4 = distinct !{!4, !5, !"hello2: %a"}
; CHECK: !5 = distinct !{!5, !"hello2"}
; CHECK: !6 = distinct !{!6, !5, !"hello2: %b"}
; CHECK: !7 = !{!4}
; CHECK: !8 = !{!6}