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how well does gcc support type-specific pointer formats?
- From: Mikael Pettersson <mikpelinux at gmail dot com>
- To: gcc at gcc dot gnu dot org
- Date: Wed, 30 Sep 2015 11:23:58 +0200
- Subject: how well does gcc support type-specific pointer formats?
- Authentication-results: sourceware.org; auth=none
Does gcc allow backends to have a say in how pointers are represented
(bits beyond the address), what happens in conversions between pointer
types, and what happens in conversions between pointers and uintptr_t?
The target in question has:
- one pointer format and set of load/store instructions for pointers to int/long
- another format and set of load/store instructions for pointers to char
- pointers to short use a third format in general, but can use the int/long
format IF you know which half of the word you're going to access
What mechanisms, if any, are present in gcc to deal with this?