Date: Tue, 29 Apr 2014 18:09:14 +0200 From: Wermut <wermut@...il.com> To: musl@...ts.openwall.com Subject: Re: thumb2 support Hi I have tested the patch from Stephen Thomas at least for gcc 4.6, 4.7 and 4.8. Seems to work. Would be nice if the 1.1.1 release will include a fix. Regards Kevin On Tue, Apr 29, 2014 at 3:14 AM, Stephen Thomas <scjthm@...e.com> wrote: >> On Tue, Apr 29, 2014 at 12:52:36AM +0100, Stephen Thomas wrote: >> > I remember that the old thumb didn't support the conditional >> > instructions and was quite slow. I only care about thumb2 and am >> > currently using gcc, so I attach a patch for the thumb that will >> >> The code here is only used on armv6/v7. Do any such chips lack thumb2? >> If there's any doubt, we could look at what gcc generates for the >> __sync_* builtins in thumb mode. >> >> > only work for gcc . >> >> Why is it only for gcc? > > I have only tested with gcc. I don't know what llvm nor armcc do. Is there > an ASM standard like ther is for C/C++/fortran? There is some good info on > thumb here, https://wiki.ubuntu.com/ARM/Thumb2 and the various ways of > supporting ARM. I guess that the thumb2 could be replaced by a __thumb__. > >> >> > I think that gcc builds two versions of atomic >> >> What do you mean by this? > > I am building the native toolchain as I would like to run this on an > embedded platform. My understanding is that when you build the toolchain you > need to provide somethings that end up going in libgcc_s.so such as > threading if you are using openmp in C++. etc etc. That patch works for both > the -marm and -mthumb or whatever the thumb targets are. > >> >> > so the ugly #define was needed. I cannot remember what rvct/rvds or >> > whatever it is branded as these days uses, but from memory old >> > versions didn't support the gnu assebmly syntax. >> >> All asm in musl is gas syntax so this is nothing new. >> >> Rich
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