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Re: GCC 4.2.0 boostrap problems on FreeBSD/ia64
- From: Andreas Schwab <schwab at suse dot de>
- To: Alexander Kabaev <kabaev at gmail dot com>
- Cc: gcc at gcc dot gnu dot org
- Date: Sun, 13 May 2007 10:53:44 +0200
- Subject: Re: GCC 4.2.0 boostrap problems on FreeBSD/ia64
- References: <20070512233323.1b1db657@kan.dnsalias.net>
Alexander Kabaev <kabaev@gmail.com> writes:
> The instruction below appears to be the problematic one, but I cannot
> tell why:
>
> [MMI] st8 [r16]=r17
This insn looks completely benign, I'd rather it's the next insn that is
the problem:
chk.a.clr r14, .L1063
This is a speculation check (see
<http://download.intel.com/design/Itanium/manuals/24531905.pdf> for the
Itanium Instruction Set Descriptions). The insn checks the result of a
preceding advanced load and branches to the label if the check failed.
The branching behaviour of the insn may be unimplemented, and would have
to be emulated in the kernel, but apparently FreeBSD doesn't support it.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
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