rtl.h (MEM_READONLY_P): Replace RTX_UNCHANGING_P.

	* rtl.h (MEM_READONLY_P): Replace RTX_UNCHANGING_P.
	* alias.c (true_dependence): Update to match new semantics.
	(canon_true_dependence, write_dependence_p): Likewise.
	(anti_dependence, output_dependence): Update write_dependence_p args.
	(unchanging_anti_dependence): Remove.
	* calls.c (purge_mem_unchanging_flag): Remove.
	(fixup_tail_calls): Don't call it.
	(expand_call): Don't add unchanging memory to function usage.
	* expr.c (emit_block_move_via_libcall): Likewise.
	(clear_storage_via_libcall): Don't clobber RTX_UNCHANGING_P mems.
	(get_subtarget): Don't use RTX_UNCHANGING_P.
	(expand_assignment, store_constructor, expand_expr_real_1): Likewise.
	(do_tablejump): Set MEM_READONLY_P, not RTX_UNCHANGING_P.
	* combine.c (get_last_value_validate): Use MEM_READONLY_P.
	* cse.c (insert): Don't use RTX_UNCHANGING_P.
	(cse_insn, canon_hash): Use MEM_READONLY_P.
	* emit-rtl.c (set_mem_attributes_minus_bitpos): Use MEM_READONLY_P
	instead of RTX_UNCHANGING_P.
	* explow.c (maybe_set_unchanging): Remove.
	* expr.h (maybe_set_unchanging): Remove.
	* flow.c (insn_dead_p, mark_used_regs): Use anti_dependence.
	* function.c (assign_stack_temp_for_type): Don't use RTX_UNCHANGING_P.
	(assign_parm_setup_reg, expand_function_start): Likewise.
	* integrate.c (copy_rtx_and_substitute): Likewise.
	* ra-rewrite.c (emit_colors): Likewise.
	* regmove.c (copy_src_to_dest, regmove_optimize): Likewise.
	(fixup_match_1): Likewise.
	* reload1.c (reload, alter_reg): Likewise.
	* local-alloc.c (validate_equiv_mem): Check MEM_READONLY_P,
	not RTX_UNCHANGING_P.
	(equiv_init_varies_p): Likewise.
	* loop-invariant.c (check_maybe_invariant): Likewise.
	* resource.c (mark_referenced_resources, mark_set_resources): Likewise.
	* loop.c (note_addr_stored): Likewise.
	(prescan_loop): Likewise. Don't check function usage for clobbered
	unchanging memory.
	* rtlanal.c (rtx_unstable_p): Check MEM_READONLY_P,
        not RTX_UNCHANGING_P.
	(rtx_varies_p, modified_between_p, modified_in_p): Likewise.
	* varasm.c (force_const_mem): Likewise.
	* stmt.c (expand_decl): Don't set RTX_UNCHANGING_P.
	* web.c (entry_register): Likewise.
	* tree-gimple.h (get_base_address): Move decl ...
	* tree.h: ... here.
	* doc/rtl.texi (MEM_READONLY_P): Replace RTX_UNCHANGING_P.

	* config/alpha/alpha.c (alpha_set_memflags_1): Rewrite to be
	called via for_each_rtx.  Copy MEM_SCALAR_P, MEM_NOTRAP_P too.
	(alpha_set_memflags): Update to match.

	* config/darwin.c (machopic_indirect_data_reference): Set
	MEM_READONLY_P instead of RTX_UNCHANGING_P.
	(machopic_indirect_call_target): Likewise.
	(machopic_legitimize_pic_address): Likewise.
	* config/arm/arm.c (legitimize_pic_address, arm_gen_load_multiple,
	arm_gen_store_multiple, arm_gen_movmemqi): Likewise.
	* config/arm/arm.md (load_multiple, store_multiple): Likewise.
	* config/frv/frv.md (symGOT2reg): Likewise.
	* config/i386/i386.c (legitimize_pic_address,
	legitimize_tls_address, ix86_split_to_parts): Likewise.
	* config/ia64/ia64.c (ia64_expand_tls_address): Likewise.
	* config/ia64/ia64.md (load_fptr): Likewise.
	* config/m32r/m32r.c (m32r_legitimize_pic_address): Likewise.
	* config/m68k/m68k.c (legitimize_pic_address): Likewise.
	* config/mcore/mcore.c (block_move_sequence): Likewise.
	* config/mn10300/mn10300.md (symGOT2reg): Likewise.
	* config/pa/pa.c (legitimize_pic_address): Likewise.
	* config/rs6000/rs6000.c (rs6000_legitimize_tls_address): Likewise.
	(rs6000_emit_move): Likewise.
	* config/s390/s390.c (legitimize_pic_address): Likewise.
	(legitimize_tls_address): Likewise.
	* config/s390/s390.md (casesi): Likewise.
	* config/sh/sh.c (prepare_move_operands, sh_reorg): Likewise.
	* config/sh/sh.md (symGOT2reg): Likewise.
	* config/sparc/sparc.c (legitimize_pic_address): Likewise.
	* config/v850/v850.md (casesi): Likewise.

	* config/ia64/ia64.c (gen_thread_pointer): Don't set RTX_UNCHANGING_P.
	* config/iq2000/iq2000.c (save_restore_insns): Likewise.
	* config/mips/mips.c (mips_restore_gp): Likewise.
	(mips_save_restore_reg, mips16_gp_pseudo_reg): Likewise.
	* config/sh/sh.c (sh_reorg): Likewise.

From-SVN: r86178

1 files changed, 2 insertions, 30 deletions

diff --git a/gcc/loop.c b/gcc/loop.c
index c8a16e0..49f86c2 100644
--- a/gcc/loop.c
+++ b/gcc/loop.c
@@ -2577,30 +2577,6 @@ prescan_loop (struct loop *loop)
 	  loop_info->has_call = 1;
 	  if (can_throw_internal (insn))
 	    loop_info->has_multiple_exit_targets = 1;
-
-	  /* Calls initializing constant objects have CLOBBER of MEM /u in the
-	     attached FUNCTION_USAGE expression list, not accounted for by the
-	     code above. We should note these to avoid missing dependencies in
-	     later references.  */
-	  {
-	    rtx fusage_entry;
-
-	    for (fusage_entry = CALL_INSN_FUNCTION_USAGE (insn);
-		 fusage_entry; fusage_entry = XEXP (fusage_entry, 1))
-	      {
-		rtx fusage = XEXP (fusage_entry, 0);
-
-		if (GET_CODE (fusage) == CLOBBER
-		    && MEM_P (XEXP (fusage, 0))
-		    && RTX_UNCHANGING_P (XEXP (fusage, 0)))
-		  {
-		    note_stores (fusage, note_addr_stored, loop_info);
-		    if (! loop_info->first_loop_store_insn
-			&& loop_info->store_mems)
-		      loop_info->first_loop_store_insn = insn;
-		  }
-	      }
-	  }
 	  break;
 
 	case JUMP_INSN:
@@ -2707,8 +2683,7 @@ prescan_loop (struct loop *loop)
   if (loop_info->unknown_constant_address_altered)
     {
       rtx mem = gen_rtx_MEM (BLKmode, const0_rtx);
-
-      RTX_UNCHANGING_P (mem) = 1;
+      MEM_READONLY_P (mem) = 1;
       loop_info->store_mems
 	= gen_rtx_EXPR_LIST (VOIDmode, mem, loop_info->store_mems);
     }
@@ -3241,7 +3216,7 @@ note_addr_stored (rtx x, rtx y ATTRIBUTE_UNUSED,
   /* BLKmode MEM means all memory is clobbered.  */
   if (GET_MODE (x) == BLKmode)
     {
-      if (RTX_UNCHANGING_P (x))
+      if (MEM_READONLY_P (x))
 	loop_info->unknown_constant_address_altered = 1;
       else
 	loop_info->unknown_address_altered = 1;
@@ -3333,9 +3308,6 @@ loop_invariant_p (const struct loop *loop, rtx x)
       return 0;
 
     case REG:
-      /* We used to check RTX_UNCHANGING_P (x) here, but that is invalid
-	 since the reg might be set by initialization within the loop.  */
-
       if ((x == frame_pointer_rtx || x == hard_frame_pointer_rtx
 	   || x == arg_pointer_rtx || x == pic_offset_table_rtx)
 	  && ! current_function_has_nonlocal_goto)