[MacPorts] #45308: clang-3.4 unexplicably slow

[MacPorts]

#45308: clang-3.4 unexplicably slow
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  Reporter:  rjvbertin@…  |      Owner:  macports-tickets@…
      Type:  defect       |     Status:  closed
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:  2.3.1
Resolution:  worksforme   |   Keywords:
      Port:  clang-3.4    |
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Comment (by rjvbertin@…):

 Replying to [comment:5 rjvbertin@…]:
 llvm 3.4.2 vs. the Apple build of the same vs. gcc-4.8 . That latter
 compiler shows that recent (and much more capable '''''than gcc-4.2''''')
 OSS compiler versions can be faster than the older Apple variant.
 >

 T,FTFY

 [OT]
 I tend to evaluate a compiler on the performance of the products built
 with it. And from that POV, clang/llvm have been playing catch-up with
 that "antiquated gcc". I have no experience with clang's auto-
 vectorisation optimiser, but up to and including clang-3.3 gcc yielded
 binaries that were faster on just about all serious computational tasks
 (I've seen its tree-vectoriser blow a hand-coded SSE2 algorithm out of the
 water).
 [/OT]

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Ticket URL: <https://trac.macports.org/ticket/45308#comment:7>
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