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Re: 64-bit port using CGEN
- To: johan dot rydberg at netinsight dot se (Johan Rydberg)
- Subject: Re: 64-bit port using CGEN
- From: fche at redhat dot com (Frank Ch. Eigler)
- Date: 16 May 2001 10:50:34 -0400
- Cc: cgen at sources dot redhat dot com
- References: <12258.989982603@cygnus.com><3B01F306.4152A19C.cygnus.local.cgen@netinsight.se>
johan.rydberg wrote:
: [...]
: First of all, opcode values are truncated to zero:
:
: static const CGEN_IFMT ifmt_j = {
: 64, 64, 0xe000000000000000, { { F (F_OPC) }, { F (F_ABS61) }, { 0 } }
: };
: pxs-opc.c:55: warning: large integer implicitly truncated to unsigned type
Yup, known problem. I suspect a good solution is to define
CGEN_INSN_INT to be "long long" for such extra-wide targets. (That
will in turn require that pervasive assumptions that CGEN_INSN_INT is
32 bits wide be corrected.)
: [...]
: Second,
: The genereated insert and extract code aborts when word length is larger than
: 32 bit. From /opcodes/cgen-ibld.in: [...]
Our very own Stan Cox has submitted a patch that aims to work around
this problem using a different approach than the "long long" idea above:
http://sources.redhat.com/ml/cgen/2001-q2/msg00003.html
- FChE