#5814: LLVM 3.0 doesn't support llvm.memory.barrier
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Reporter: bgamari | Owner: dterei
Type: bug | Status: new
Priority: normal | Component: Compiler (LLVM)
Version: 7.5 | Keywords:
Os: Unknown/Multiple | Architecture: Unknown/Multiple
Failure: None/Unknown | Testcase:
Blockedby: | Blocking:
Related: |
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Changes (by bgamari):
* version: 7.2.2 => 7.5
Comment:
In the name of release early, release often I'm attaching my hacked patch
to use the "fence" instruction. The code compiles and seems to run, but
this is not to say that it is correct. In fact, there are at least two
outstanding issues,
1) Logic needs to be wired up to emit llvm.memory.barrier when dealing
with old LLVMs
2) Someone with greater knowledge of the synchronization requirements of
cmm's write barrier primative should take a look at the LLVM atomics
documentation (http://llvm.org/releases/3.0/docs/Atomics.html) and ensure
that my use of "fence" is correct
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5814#comment:1>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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