[LLVMbugs] [Bug 6636] New: x86_64 vararg garbled with very long argument list

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6636

           Summary: x86_64 vararg garbled with very long argument list
           Product: libraries
           Version: trunk
          Platform: PC
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
        AssignedTo: unassignedbugs at nondot.org
        ReportedBy: benny.kra at gmail.com
                CC: llvmbugs at cs.uiuc.edu


$ cat bug.c
// test by quest (http://code.google.com/p/quest-tester/)
// carefully reduced.

#include <assert.h>
#include <stdarg.h>

struct three {
  int i[3];
};

static int check = 42;

static void foo(int i1, int i2, int i3, int i4, int i5, int i6, struct three
s1, ...) {
  va_list ap;
  va_start(ap, s1);
  int arg = va_arg(ap, int);
  assert(check == arg);
  va_end(ap);
}

int main() {
  struct three s;
  foo(0, 0, 0, 0, 0, 0, s, check);
}

$ gcc bug.c && ./a.out && echo ok
ok
$ clang bug.c && ./a.out && echo ok
Assertion failed: (check == arg), function foo, file bug.c, line 17.
[1]    23350 abort      ./a.out

$ clang --version
clang version 1.1 (trunk 98723)
Target: x86_64-apple-darwin10
Thread model: posix

llvm-gcc seems to have the same problem.

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