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Re: setting BI operands

To: Ben Elliston <bje at cygnus dot com>
Subject: Re: setting BI operands
From: "Frank Ch. Eigler" <fche at redhat dot com>
Date: Thu, 2 Nov 2000 21:56:57 -0500
Cc: cgen development <cgen at sources dot redhat dot com>
References: <Pine.LNX.4.30.0011031053110.24023-100000@moshpit.cygnus.com>

Hi -

On Fri, Nov 03, 2000 at 10:56:34AM +1100, Ben Elliston wrote:
: I noticed that it's possible to assign operands of BI modes to non-boolean
: values.  I'm assuming this is because the generated code stores this in a
: byte quantity.

The cgen type system is only partly defined by cgen proper.  Most of it is
actually up to the run-time code in opcodes/, sim/, sid/.  In C++, the bool
type is used, and its conersion rules happen to apply.

: If the appropriate setter method for BI operands were altered to include
: something like (newval > 0) rather than (newval), we could ensure that these
: operands only ever equal zero or one.

This would be a restriction over the C rules (0 vs !0).  In what context
is it an improvement?


- FChE

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