[Bug inline-asm/52813] New: %rsp in clobber list is silently ignored

[jhaberman at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52813

             Bug #: 52813
           Summary: %rsp in clobber list is silently ignored
    Classification: Unclassified
           Product: gcc
           Version: 4.6.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: inline-asm
        AssignedTo: unassig...@gcc.gnu.org
        ReportedBy: jhaber...@gmail.com


The following test program crashes even though I correctly listed %rsp as
clobbered:

--

int main() {
  asm volatile ("movq $0, %%rsp" : : : "%rsp");
  return 0;
}

--

I would prefer gcc to error out in this case instead of silently ignoring my
instruction.