#1435: "Naughty" register error in Cmm
-------------------------------+--------------------------------------------
Reporter: Michael D. Adams | Owner:
Type: bug | Status: new
Priority: normal | Milestone:
Component: Compiler | Version: 6.7
Severity: normal | Keywords:
Difficulty: Unknown | Os: Linux
Testcase: | Architecture: x86
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When experimenting with Cmm code, I found the following bug/trap.
This Cmm code,
{{{
foo {
bits8 x;
x = 5;
bits8[12] = x;
R1 = x;
jump bar;
}
}}}
causes the following error
{{{
/tmp/ghc6613_0/ghc6613_0.s: Assembler messages:
/tmp/ghc6613_0/ghc6613_0.s:7:0:
Error: junk `naughty I386 byte register' after expression
}}}
The assembly that is produced is:
{{{
.text
.align 4,0x90
.globl foo
foo:
movl $5,%eax
movb %al,12
movb %al,very naughty I386 byte register
jmp bar
.section .note.GNU-stack,"",@progbits
.ident "GHC 6.7.20070612"
}}}
Note the "very naughty I386 byte register" in there.
I am not sure whether this kind of Cmm can be generated from Haskell code.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1435>
GHC <http://www.haskell.org/ghc/>
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