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Re: [MIT-Scheme-devel] Bug: Poor error message; maybe a sign of somethin
Taylor R Campbell
Re: [MIT-Scheme-devel] Bug: Poor error message; maybe a sign of something worse?
Mon, 22 Aug 2011 20:31:15 +0000
IMAIL/1.21; Edwin/3.116; MIT-Scheme/9.1
Date: Sun, 21 Aug 2011 21:19:55 +0100
From: Alexey Radul <address@hidden>
Expected behavior: Ideally, the compiler would successfully compile
the enclosed file; I believe it to be correct -- in particular, the
interpreter runs it without incident -- though I would not stake my
reputation on the absence of errors in it. Failing that, however, I
would wish the error message to be more informative. Is this a
manifestation of a limitation on the maximum size of basic block that
the x86-64 code generator is willing to emit?
It is indeed a manifestation of such a limit. Changing the error
message to say that a little more explicitly would be easy, but not
much more helpful for the user.
I'm looking into changing the actual limit, which looks to be a little
fiddly. There may also be other limits lurking throughout the code
that nobody has documented or analyzed, although probably most of them
are 32-bit limits rather than 16-bit limits like this one.