#4992: LLVM trashes registers for primitive calls
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Reporter: scpmw | Owner: davidterei@…
Type: bug | Status: patch
Priority: normal | Milestone:
Component: Compiler (LLVM) | Version: 7.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Linux | Blocking:
Architecture: x86_64 (amd64) | Failure: Runtime crash
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Comment(by scpmw):
Okay, seems you are indeed right. Once registers are actually live, they
get saved and the code does what it should.
The root cause here was my GHC tinkering, which happened to generate
primitive calls without paying attention to live variables - which is in
itself perfectly safe except that LLVM codegen counts on this unnecessary
register saving taking place in order to produce correct code. Whew,
didn't expect that.
Apologies for the confusion. I guess this can be closed, as the upsides
have now been reduced to
just less redundant code getting generated.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4992#comment:7>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler
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