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: [email protected]
ReportedBy: [email protected]
CC: [email protected], [email protected]
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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