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Re: [COMMITTED] tilegx: enable wordsize-64 support for ieee745 dbl-64.
- From: Andrew Pinski <pinskia at gmail dot com>
- To: Chris Metcalf <cmetcalf at ezchip dot com>
- Cc: "H.J. Lu" <hjl dot tools at gmail dot com>, Joseph Myers <joseph at codesourcery dot com>, GNU C Library <libc-alpha at sourceware dot org>
- Date: Wed, 24 Dec 2014 15:45:32 -0800
- Subject: Re: [COMMITTED] tilegx: enable wordsize-64 support for ieee745 dbl-64.
- Authentication-results: sourceware.org; auth=none
- References: <201412231905 dot sBNJ5c3C004622 at farm-0002 dot internal dot tilera dot com> <alpine dot DEB dot 2 dot 10 dot 1412231958370 dot 31777 at digraph dot polyomino dot org dot uk> <5499D4FE dot 8070405 at ezchip dot com> <5499DA84 dot 3010205 at ezchip dot com> <CAMe9rOr2DU5qYDQriF9RvAJCJF_wZ3gzqqHGDZXf+-OZFuJX0g at mail dot gmail dot com> <5499E115 dot 9000502 at ezchip dot com> <CAMe9rOrFEVEpPik-qMR=SPM-Eqgetwg9C3oztjT4yTf74S+EWw at mail dot gmail dot com> <549AF3A3 dot 8070007 at ezchip dot com>
On Wed, Dec 24, 2014 at 9:10 AM, Chris Metcalf <firstname.lastname@example.org> wrote:
> On 12/23/2014 5:39 PM, H.J. Lu wrote:
>> You can provide a safe default and let x32 override it.
> I think it's conventional now to require that platforms are explicit
> about #defines, and use #if with -Wundef. It seems to make good sense
> in this case, since it's really not clear what the right default for
> any given platform is.
> And since there are currently just two platforms that use wordsize-64
> and are !_LP64 (x32 and tilegx32), it feels pretty reasonable to be
> explicit for both. The AArch64 guys will need to set the right default
> for their ILP32 mode; I'm not even sure what the right answer is for them.
AARCH64:ILP32 is fine with having the upper bits being undefined when
dealing with passing and return values.
> Chris Metcalf, EZChip Semiconductor