patch for IA-64 function call miscompilation

[Jim Wilson]

This fixes miscompilation of do_slurp_coff_armap in bfd/archive.c.
The call to bfd_getb32 was converted from a direct call to an register
indirect call by cse, but that fails because IA-64 uses function descriptors,
and thus register indirect calls need a different instruction sequence.  We
fix this by obfuscating function SYMBOL_REFs a bit so that they won't get
cse'd into call instructions.  This just returns us to the same code we had
a few months ago before some recent optimization changes.

2000-08-24  Jim Wilson  <wilson@cygnus.com>

	* config/ia64/ia64.md (movdi): Don't call gen_movdi_symbolic if
	we have a SYMBOL_REF with SYMBOL_REF_FLAG set.

Index: ia64.md
===================================================================
RCS file: /cvs/gcc/egcs/gcc/config/ia64/ia64.md,v
retrieving revision 1.36
diff -p -r1.36 ia64.md
*** ia64.md	2000/08/20 19:03:03	1.36
--- ia64.md	2000/08/24 20:43:22
***************
*** 358,364 ****
  	 type of PIC address load.  If this function gets deferred, we
  	 may acquire information that changes the value of the
  	 sdata_symbolic_operand predicate.  */
!       if (rtx_equal_function_value_matters)
  	emit_insn (gen_movdi_symbolic (operands[0], operands[1]));
        else
          ia64_expand_load_address (operands[0], operands[1]);
--- 358,372 ----
  	 type of PIC address load.  If this function gets deferred, we
  	 may acquire information that changes the value of the
  	 sdata_symbolic_operand predicate.  */
!       /* But don't delay for function pointers.  Loading a function address
! 	 actually loads the address of the descriptor not the function.
! 	 If we represent these as SYMBOL_REFs, then they get cse'd with
! 	 calls, and we end up with calls to the descriptor address instead of
! 	 calls to the function address.  Functions are not candidates for
! 	 sdata anyways.  */
!       if (rtx_equal_function_value_matters
! 	  && ! (GET_CODE (operands[1]) == SYMBOL_REF
! 		&& SYMBOL_REF_FLAG (operands[1])))
  	emit_insn (gen_movdi_symbolic (operands[0], operands[1]));
        else
          ia64_expand_load_address (operands[0], operands[1]);