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From: "ebotcazou at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug middle-end/58970] [4.7/4.8/4.9 Regression] internal compiler error: in get_bit_range, at expr.c:4562
Date: Mon, 04 Nov 2013 17:55:00 -0000
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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58970

--- Comment #22 from Eric Botcazou <ebotcazou at gcc dot gnu.org> ---
> Eric declared negative bitpos to be a nono that the expander is not handling
> well.  Thus, Eric, please chime in here.

Well, that's a basic sanity requirement, all the routines in expmed.c dealing
with bitfields use unsigned HOST_WIDE_INT so, yes, better avoid negative values
unless you really know what you're doing...