1 /* Generic hooks for the RTL middle-end.
2 Copyright (C) 2004 Free Software Foundation, Inc.
4 This file is part of GCC.
6 GCC is free software; you can redistribute it and/or modify it under
7 the terms of the GNU General Public License as published by the Free
8 Software Foundation; either version 2, or (at your option) any later
11 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12 WARRANTY; without even the implied warranty of MERCHANTABILITY or
13 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16 You should have received a copy of the GNU General Public License
17 along with GCC; see the file COPYING. If not, write to the Free
18 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
23 #include "coretypes.h"
26 #include "rtlhooks-def.h"
30 /* For speed, we will copy the RTX hooks struct member-by-member
31 instead of doing indirect calls. For these reason, we initialize
32 *two* struct rtl_hooks globals: rtl_hooks is the one that is used
33 to actually call the hooks, while general_rtl_hooks is used
34 to restore the hooks by passes that modify them. */
36 const struct rtl_hooks general_rtl_hooks = RTL_HOOKS_INITIALIZER;
37 struct rtl_hooks rtl_hooks = RTL_HOOKS_INITIALIZER;
40 gen_lowpart_general (enum machine_mode mode, rtx x)
42 rtx result = gen_lowpart_common (mode, x);
48 /* Must be a hard reg that's not valid in MODE. */
49 result = gen_lowpart_common (mode, copy_to_reg (x));
50 gcc_assert (result != 0);
57 /* The only additional case we can do is MEM. */
58 gcc_assert (MEM_P (x));
60 /* The following exposes the use of "x" to CSE. */
61 if (GET_MODE_SIZE (GET_MODE (x)) <= UNITS_PER_WORD
62 && SCALAR_INT_MODE_P (GET_MODE (x))
63 && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
64 GET_MODE_BITSIZE (GET_MODE (x)))
66 return gen_lowpart_general (mode, force_reg (GET_MODE (x), x));
69 offset = (MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD)
70 - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD));
73 /* Adjust the address so that the address-after-the-data
75 offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))
76 - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x))));
78 return adjust_address (x, mode, offset);
83 reg_num_sign_bit_copies_general (rtx x ATTRIBUTE_UNUSED,
84 enum machine_mode mode ATTRIBUTE_UNUSED,
85 rtx known_x ATTRIBUTE_UNUSED,
86 enum machine_mode known_mode ATTRIBUTE_UNUSED,
87 unsigned int known_ret ATTRIBUTE_UNUSED,
88 unsigned int *result ATTRIBUTE_UNUSED)
94 reg_nonzero_bits_general (rtx x ATTRIBUTE_UNUSED,
95 enum machine_mode mode ATTRIBUTE_UNUSED,
96 rtx known_x ATTRIBUTE_UNUSED,
97 enum machine_mode known_mode ATTRIBUTE_UNUSED,
98 unsigned HOST_WIDE_INT known_ret ATTRIBUTE_UNUSED,
99 unsigned HOST_WIDE_INT *nonzero ATTRIBUTE_UNUSED)