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Diffstat (limited to 'gcc/rtlhooks.c')
| -rw-r--r-- | gcc/rtlhooks.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/gcc/rtlhooks.c b/gcc/rtlhooks.c new file mode 100644 index 0000000..b27cece --- /dev/null +++ b/gcc/rtlhooks.c @@ -0,0 +1,105 @@ +/* Generic hooks for the RTL middle-end. + Copyright (C) 2004 Free Software Foundation, Inc. + +This file is part of GCC. + +GCC is free software; you can redistribute it and/or modify it under +the terms of the GNU General Public License as published by the Free +Software Foundation; either version 2, or (at your option) any later +version. + +GCC is distributed in the hope that it will be useful, but WITHOUT ANY +WARRANTY; without even the implied warranty of MERCHANTABILITY or +FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License +for more details. + +You should have received a copy of the GNU General Public License +along with GCC; see the file COPYING. If not, write to the Free +Software Foundation, 59 Temple Place - Suite 330, Boston, MA +02111-1307, USA. */ + +#include "config.h" +#include "system.h" +#include "coretypes.h" +#include "tm.h" +#include "rtl.h" +#include "rtlhooks-def.h" +#include "expr.h" + + +/* For speed, we will copy the RTX hooks struct member-by-member + instead of doing indirect calls. For these reason, we initialize + *two* struct rtl_hooks globals: rtl_hooks is the one that is used + to actually call the hooks, while general_rtl_hooks is used + to restore the hooks by passes that modify them. */ + +const struct rtl_hooks general_rtl_hooks = RTL_HOOKS_INITIALIZER; +struct rtl_hooks rtl_hooks = RTL_HOOKS_INITIALIZER; + +rtx +gen_lowpart_general (enum machine_mode mode, rtx x) +{ + rtx result = gen_lowpart_common (mode, x); + + if (result) + return result; + else if (GET_CODE (x) == REG) + { + /* Must be a hard reg that's not valid in MODE. */ + result = gen_lowpart_common (mode, copy_to_reg (x)); + if (result == 0) + abort (); + return result; + } + else if (GET_CODE (x) == MEM) + { + /* The only additional case we can do is MEM. */ + int offset = 0; + + /* The following exposes the use of "x" to CSE. */ + if (GET_MODE_SIZE (GET_MODE (x)) <= UNITS_PER_WORD + && SCALAR_INT_MODE_P (GET_MODE (x)) + && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), + GET_MODE_BITSIZE (GET_MODE (x))) + && ! no_new_pseudos) + return gen_lowpart_general (mode, force_reg (GET_MODE (x), x)); + + if (WORDS_BIG_ENDIAN) + offset = (MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD) + - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD)); + + if (BYTES_BIG_ENDIAN) + /* Adjust the address so that the address-after-the-data + is unchanged. */ + offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode)) + - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x)))); + + return adjust_address (x, mode, offset); + } + else if (GET_CODE (x) == ADDRESSOF) + return gen_lowpart_general (mode, force_reg (GET_MODE (x), x)); + else + abort (); +} + +rtx +reg_num_sign_bit_copies_general (rtx x ATTRIBUTE_UNUSED, + enum machine_mode mode ATTRIBUTE_UNUSED, + rtx known_x ATTRIBUTE_UNUSED, + enum machine_mode known_mode ATTRIBUTE_UNUSED, + unsigned int known_ret ATTRIBUTE_UNUSED, + unsigned int *result ATTRIBUTE_UNUSED) +{ + return NULL; +} + +rtx +reg_nonzero_bits_general (rtx x ATTRIBUTE_UNUSED, + enum machine_mode mode ATTRIBUTE_UNUSED, + rtx known_x ATTRIBUTE_UNUSED, + enum machine_mode known_mode ATTRIBUTE_UNUSED, + unsigned HOST_WIDE_INT known_ret ATTRIBUTE_UNUSED, + unsigned HOST_WIDE_INT *nonzero ATTRIBUTE_UNUSED) +{ + return NULL; +} |