[coreboot] __attribute__((stdcall)) vs. __attribute__((regparm(0)))

Carl-Daniel Hailfinger c-d.hailfinger.devel.2006 at gmx.net
Thu Oct 16 17:47:59 CEST 2008

On 16.10.2008 17:41, ron minnich wrote:
> On Thu, Oct 16, 2008 at 7:58 AM, Myles Watson <mylesgw at gmail.com> wrote:
>> The question is what attribute can be used to make those functions have the
>> normal calling convention when compiling with -mregparm=3.  We're using
>> -mregparm=3 for speed reasons.
> The simplest thing: put all the functions that need regparm=0 in one
> file, compile that file with regparm=0

Indeed simple, but it won't work because every function outside this
file, but called from this file will have a calling convention conflict.
The caller will assume regparm(0), the callee will assume regparm(3). Boom.

Myles, please go with __attribute__((regparm(0))) for the functions that
need it.



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