Another IA-64 Boehm gc patch

[Andrew Haley <aph at pasanda dot cygnus dot co dot uk>]

This patch changes an asm in order to avoid a reload failure that
results from trying to pass a 32-bit subreg as a 64-bit register.

This is possibly a compiler bug, but this patch is a workaround that
generates the correct code.

Comments?

Andrew.

2000-06-19  Andrew Haley  <aph@cygnus.com>

        * gc_priv.h (GC_test_and_set): Use a long rather than an int for a
        register arg.
 
Index: gc_priv.h
===================================================================
RCS file: /cvs/java/libgcj/boehm-gc/gc_priv.h,v
retrieving revision 1.12
diff -p -2 -c -r1.12 gc_priv.h
*** gc_priv.h   2000/05/07 00:43:49     1.12
--- gc_priv.h   2000/06/19 19:03:37
*************** void GC_print_callers (/* struct callinf
*** 455,462 ****
  #    if defined(IA64)
         inline static int GC_test_and_set(volatile unsigned int *addr) {
!         int oldval;
          __asm__ __volatile__("xchg4 %0=%1,%2"
                : "=r"(oldval), "=m"(*addr)
!               : "r"(1), "1"(*addr));
          return oldval;
         }
--- 455,462 ----
  #    if defined(IA64)
         inline static int GC_test_and_set(volatile unsigned int *addr) {
!         long oldval, n = 1;
          __asm__ __volatile__("xchg4 %0=%1,%2"
                : "=r"(oldval), "=m"(*addr)
!               : "r"(n), "1"(*addr));
          return oldval;
         }