diff options
Diffstat (limited to 'gcc/loop.c')
| -rw-r--r-- | gcc/loop.c | 32 |
1 files changed, 2 insertions, 30 deletions
diff --git a/gcc/loop.c b/gcc/loop.c index c8a16e0850d..49f86c2887a 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) |