[LLVMbugs] [Bug 4565] New: ARM doesn't recognize aapcs-defined register synonyms

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=4565

           Summary: ARM doesn't recognize aapcs-defined register synonyms
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Backend: ARM
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: nlewycky at google.com
                CC: asl at math.spbu.ru, llvmbugs at cs.uiuc.edu


AAPCS 5.1.1 defines a1..a4 and v1..v8 as synonyms for arm registers. These
aren't recognized by LLVM causing an llvm-gcc bootstrap failure on that target.

Testcase:

void test() {
  unsigned long BEG = 0;
  unsigned long END = 1;

  register unsigned long _beg __asm ("a1") = (unsigned long) (BEG);     
  register unsigned long _end __asm ("a2") = (unsigned long) (END);     
  register unsigned long _flg __asm ("a3") = 0;                         
  register unsigned long _scno __asm ("r7") = 0xf0002;                  
  __asm __volatile ("swi 0x9f0002               @ sys_cacheflush"       
                    : "=r" (_beg)                                       
                    : "0" (_beg), "r" (_end), "r" (_flg), "r" (_scno)); 
}

Error when building:

LLVM ERROR: llvm: error: Couldn't allocate output reg for constraint '{a1}'!


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