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Re: [libitm] Configure for gas cfi pseudos
On Wed, 2011-11-09 at 19:50 +0100, Jakub Jelinek wrote:
> On Wed, Nov 09, 2011 at 10:33:12AM -0800, Richard Henderson wrote:
> > > If the code ensures at runtime that AVX insns (or SSE for that matter)
> > > are only used if hardware and OS are capable of executing them, one
> > > can deal with this with the equivalent of
> > > gcc/testsuite/gcc.target/i386/clearcap.map when linking libitm.so.
> >
> > Yes, the _M256 entry points will only be used when AVX is used in the compiler.
> >
> > > Besides, we need to make sure that the assembler used is able to
> > > assemble SSE and/or AVX insns before using them.
> >
> > I do worry about building a library version missing symbols though...
>
> Aren't the symbol versions part of the ABI discussed with Intel and others
> though?
This ABI is explicitly for x86 on Linux (we've ignored the Windows
version of it so far). We thus can define it differently (or just offer
a subset of the symbols) on other architectures/platforms.