http://gcc.gnu.org/onlinedocs/gcc-3.3.1/gcc/Function-Attributes.html#Function%20Attributes --regparm This is the section in question. This is about parameter passing not variable declaration. Yamin Quoting Kimmo Fredriksson <kfredrik@xxxxxxxxxxxxx>: > On Wed, 19 Nov 2003 y2bismil@xxxxxxxxxxxxxxxxxxxx wrote: > > > Hi, > > > > No, its not a problem of variable arguments. There's no problem per se. > I'm > > just asking if its guaranteed or if its one of those GCC 'hints' that may > or may > > not be done. > > I suppose it just a hint, that may (will?) be ignored. On the other hand, > see: > > http://gcc.gnu.org/onlinedocs/gcc/Explicit-Reg-Vars.html#Explicit%20Reg%20Vars > > Kimmo > > > > > > > Thanks, > > > > Yamin > > > > Quoting qinfeng.zhang@xxxxxxxxxxx: > > > > > Is it the problem of vararg? > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > y2bismil@xxxxxxxxxxxxxxxxxxxx > > > Sent by: > > > gcc-help-owner@xxxxxxxxxxx > > > 2003-11-19 04:41 > > > > > > > > > To: GCC- help <gcc-help@xxxxxxxxxxx> > > > cc: (bcc: Qinfeng Zhang/SHA/RESEARCH/PHILIPS) > > > Subject: regparm guarantee > > > Classification: > > > > > > > > > > > > > > > > > > I was wondering if by specifying regparam for a function if it is > > > GUARANTEED > > > that parameters passed to the function will be made via register. I ask > > > this as > > > I'm interfacing with an assembly written library which links to external > > > c-code. > > > When the assembly routines call c-function, there are some that are > > > stdcall, > > > and some pass variables through register (they only pass 1 variable as > far > > > as I > > > can see in EAX). > > > > > > Is there any way to explicitly say "use EAX for this parameter?" > > > >From the wording of the manual under 'function attributes', it doesn't > > > appear > > > so. But I might guess that it places the 1st paramter in EAX, second in > > > EBX, > > > then ECX, EDX. > > > > > > Thanks, > > > > > > Yamin > > > > > > ---------------------------------------- > > > This mail sent through www.mywaterloo.ca > > > > > > > > > > > > > > > > > > > ---------------------------------------- > > This mail sent through www.mywaterloo.ca > > > ---------------------------------------- This mail sent through www.mywaterloo.ca
