#2209: MagicHash extraction is wrong on x86_64 with -fasm -O2
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Reporter: quark | Owner:
Type: bug | Status: new
Priority: normal | Milestone: 6.8.3
Component: Compiler | Version: 6.8.2
Severity: major | Resolution:
Keywords: | Difficulty: Unknown
Testcase: | Architecture: x86_64 (amd64)
Os: Linux |
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Changes (by igloo):
* difficulty: => Unknown
* milestone: => 6.8.3
Comment:
In my validated-HEAD, this gives me
{{{
/tmp/ghc4469_0/ghc4469_0.s:460:0:
Error: suffix or operands invalid for `test'
/tmp/ghc4469_0/ghc4469_0.s:463:0:
Error: suffix or operands invalid for `test'
/tmp/ghc4469_0/ghc4469_0.s:474:0:
Error: suffix or operands invalid for `movsd'
}}}
complaining about these 3 lines:
{{{
testq %xmm0,%xmm0
testq %xmm0,%xmm0
movsd .Ln1c1(%rip),%rsi
}}}
We do claim that this ("Casting an unboxed type to another unboxed type of
the same size") works in the `unsafeCoerce#` docs, so we ought to fix it!
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2209#comment:2>
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