[llvm] r214550 - MS inline asm: Use memory constraints for functions instead of registers

[Duncan P. N. Exon Smith]

> On 2014 Aug 1, at 15:04, Reid Kleckner <rnk at google.com> wrote:
> 
> On Fri, Aug 1, 2014 at 2:39 PM, Duncan P. N. Exon Smith <dexonsmith at apple.com> wrote:
> 
> > On 2014 Aug 1, at 13:21, Reid Kleckner <reid at kleckner.net> wrote:
> >
> > Author: rnk
> > Date: Fri Aug  1 15:21:24 2014
> > New Revision: 214550
> >
> > URL: http://llvm.org/viewvc/llvm-project?rev=214550&view=rev
> > Log:
> > MS inline asm: Use memory constraints for functions instead of registers
> >
> > This is consistent with how we parse them in a standalone .s file, and
> > inline assembly shouldn't differ.
> >
> > This fixes errors about requiring more registers than available in
> > cases like this:
> >  void f();
> >  void __declspec(naked) g() {
> >    __asm pusha
> >    __asm call f
> >    __asm popa
> >    __asm ret
> >  }
> >
> > There are no registers available to pass the address of 'f' into the asm
> > blob.  The asm should now directly call 'f'.
> >
> > Tests will land in Clang shortly.
> >
> > Modified:
> >    llvm/trunk/lib/Target/X86/AsmParser/X86AsmParser.cpp
> >    llvm/trunk/test/CodeGen/X86/ms-inline-asm.ll
> 
> This testcase is failing locally for me on Darwin:
> 
> > error: inline assembly requires more registers than available
> > FileCheck error: '-' is empty.
> 
> Let me know if you need help reproducing.
> 
> I hid the symbol in r214571, hopefully that fixes it. 

Fixed, thanks!