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Re: [PATCH][C++] Get rid of TREE_CHAIN use for TREE_VEC (NON_DEFAULT_TEMPLATE_ARGS_COUNT)

From: Paolo Carlini <paolo dot carlini at oracle dot com>
To: Richard Guenther <rguenther at suse dot de>
Cc: gcc-patches at gcc dot gnu dot org, Jason Merrill <jason at redhat dot com>
Date: Fri, 17 Aug 2012 15:58:14 +0200
Subject: Re: [PATCH][C++] Get rid of TREE_CHAIN use for TREE_VEC (NON_DEFAULT_TEMPLATE_ARGS_COUNT)
References: <alpine.LNX.2.00.1208171318190.28649@zhemvz.fhfr.qr>

On 08/17/2012 01:26 PM, Richard Guenther wrote:

This gets rid of this field, pushing it into a short int in tree_base
(hopefully 2^16 non-defaulted template args are enough ...).

Honestly, I don't think it's a trivial issue. Often and often, while hacking the C++ front-end I noticed the integer typee which we use while processing templates and I become nervous even when I see ints. In these 64-bit days and with people using all sorts of crazy template metaprogramming, if I were to design these things from scratch I guess that I would just use longs everywhere and be done with it. At minimum, compare to clang? But hey, I'm new to most of the C++ front-end internals maybe people already discussed these topics in the past, even at ISO level, I don't know. I'm curious to hear Jason anyway.

Paolo.

Follow-Ups:
- Re: [PATCH][C++] Get rid of TREE_CHAIN use for TREE_VEC (NON_DEFAULT_TEMPLATE_ARGS_COUNT)
  - From: Mike Stump

References:
- [PATCH][C++] Get rid of TREE_CHAIN use for TREE_VEC (NON_DEFAULT_TEMPLATE_ARGS_COUNT)
  - From: Richard Guenther

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