1 /* Output routines for GCC for CRX.
2 Copyright (C) 1991, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
3 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010
4 Free Software Foundation, Inc.
6 This file is part of GCC.
8 GCC is free software; you can redistribute it and/or modify it
9 under the terms of the GNU General Public License as published
10 by the Free Software Foundation; either version 3, or (at your
11 option) any later version.
13 GCC is distributed in the hope that it will be useful, but WITHOUT
14 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
15 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
16 License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GCC; see the file COPYING3. If not see
20 <http://www.gnu.org/licenses/>. */
22 /*****************************************************************************/
24 /*****************************************************************************/
28 #include "coretypes.h"
34 #include "hard-reg-set.h"
35 #include "insn-config.h"
36 #include "conditions.h"
38 #include "insn-codes.h"
39 #include "insn-attr.h"
46 #include "diagnostic-core.h"
48 #include "basic-block.h"
51 #include "target-def.h"
53 /*****************************************************************************/
55 /*****************************************************************************/
57 /* Maximum number of register used for passing parameters. */
58 #define MAX_REG_FOR_PASSING_ARGS 6
60 /* Minimum number register used for passing parameters. */
61 #define MIN_REG_FOR_PASSING_ARGS 2
63 /* The maximum count of words supported in the assembly of the architecture in
64 * a push/pop instruction. */
67 /* Predicate is true if the current function is a 'noreturn' function, i.e. it
68 * is qualified as volatile. */
69 #define FUNC_IS_NORETURN_P(decl) (TREE_THIS_VOLATILE (decl))
71 /* The following macros are used in crx_decompose_address () */
73 /* Returns the factor of a scaled index address or -1 if invalid. */
74 #define SCALE_FOR_INDEX_P(X) \
75 (GET_CODE (X) == CONST_INT ? \
76 (INTVAL (X) == 1 ? 1 : \
77 INTVAL (X) == 2 ? 2 : \
78 INTVAL (X) == 4 ? 4 : \
79 INTVAL (X) == 8 ? 8 : \
83 /* Nonzero if the rtx X is a signed const int of n bits */
84 #define RTX_SIGNED_INT_FITS_N_BITS(X,n) \
85 ((GET_CODE (X) == CONST_INT \
86 && SIGNED_INT_FITS_N_BITS (INTVAL (X), n)) ? 1 : 0)
88 /* Nonzero if the rtx X is an unsigned const int of n bits. */
89 #define RTX_UNSIGNED_INT_FITS_N_BITS(X, n) \
90 ((GET_CODE (X) == CONST_INT \
91 && UNSIGNED_INT_FITS_N_BITS (INTVAL (X), n)) ? 1 : 0)
93 /*****************************************************************************/
94 /* STATIC VARIABLES */
95 /*****************************************************************************/
97 /* Nonzero if the last param processed is passed in a register. */
98 static int last_parm_in_reg
;
100 /* Will hold the number of the last register the prologue saves, -1 if no
101 * register is saved. */
102 static int last_reg_to_save
;
104 /* Each object in the array is a register number. Mark 1 for registers that
105 * need to be saved. */
106 static int save_regs
[FIRST_PSEUDO_REGISTER
];
108 /* Number of bytes saved on the stack for non-scratch registers */
109 static int sum_regs
= 0;
111 /* Number of bytes saved on the stack for local variables. */
112 static int local_vars_size
;
114 /* The sum of 2 sizes: locals vars and padding byte for saving the registers.
115 * Used in expand_prologue () and expand_epilogue (). */
116 static int size_for_adjusting_sp
;
118 /* In case of a POST_INC or POST_DEC memory reference, we must report the mode
119 * of the memory reference from PRINT_OPERAND to PRINT_OPERAND_ADDRESS. */
120 static enum machine_mode output_memory_reference_mode
;
122 /*****************************************************************************/
123 /* TARGETM FUNCTION PROTOTYPES */
124 /*****************************************************************************/
126 static bool crx_fixed_condition_code_regs (unsigned int *, unsigned int *);
127 static rtx
crx_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED
,
128 int incoming ATTRIBUTE_UNUSED
);
129 static bool crx_return_in_memory (const_tree type
, const_tree fntype ATTRIBUTE_UNUSED
);
130 static int crx_address_cost (rtx
, bool);
131 static bool crx_legitimate_address_p (enum machine_mode
, rtx
, bool);
132 static bool crx_can_eliminate (const int, const int);
133 static rtx
crx_function_arg (CUMULATIVE_ARGS
*, enum machine_mode
,
135 static void crx_function_arg_advance (CUMULATIVE_ARGS
*, enum machine_mode
,
138 /*****************************************************************************/
140 /*****************************************************************************/
142 #undef TARGET_LEGITIMATE_ADDRESS_P
143 #define TARGET_LEGITIMATE_ADDRESS_P crx_legitimate_address_p
145 #undef TARGET_CAN_ELIMINATE
146 #define TARGET_CAN_ELIMINATE crx_can_eliminate
148 /*****************************************************************************/
149 /* STACK LAYOUT AND CALLING CONVENTIONS */
150 /*****************************************************************************/
152 #undef TARGET_FIXED_CONDITION_CODE_REGS
153 #define TARGET_FIXED_CONDITION_CODE_REGS crx_fixed_condition_code_regs
155 #undef TARGET_STRUCT_VALUE_RTX
156 #define TARGET_STRUCT_VALUE_RTX crx_struct_value_rtx
158 #undef TARGET_RETURN_IN_MEMORY
159 #define TARGET_RETURN_IN_MEMORY crx_return_in_memory
161 /*****************************************************************************/
162 /* PASSING FUNCTION ARGUMENTS */
163 /*****************************************************************************/
165 #undef TARGET_FUNCTION_ARG
166 #define TARGET_FUNCTION_ARG crx_function_arg
168 #undef TARGET_FUNCTION_ARG_ADVANCE
169 #define TARGET_FUNCTION_ARG_ADVANCE crx_function_arg_advance
171 /*****************************************************************************/
172 /* RELATIVE COSTS OF OPERATIONS */
173 /*****************************************************************************/
175 #undef TARGET_ADDRESS_COST
176 #define TARGET_ADDRESS_COST crx_address_cost
178 /*****************************************************************************/
179 /* TARGET-SPECIFIC USES OF `__attribute__' */
180 /*****************************************************************************/
182 #undef TARGET_ATTRIBUTE_TABLE
183 #define TARGET_ATTRIBUTE_TABLE crx_attribute_table
185 static const struct attribute_spec crx_attribute_table
[] = {
186 /* ISRs have special prologue and epilogue requirements. */
187 {"interrupt", 0, 0, false, true, true, NULL
},
188 {NULL
, 0, 0, false, false, false, NULL
}
191 /* Option handling. */
193 #undef TARGET_OPTION_OPTIMIZATION_TABLE
194 #define TARGET_OPTION_OPTIMIZATION_TABLE crx_option_optimization_table
196 static const struct default_options crx_option_optimization_table
[] =
198 /* Put each function in its own section so that PAGE-instruction
199 relaxation can do its best. */
200 { OPT_LEVELS_1_PLUS
, OPT_ffunction_sections
, NULL
, 1 },
201 { OPT_LEVELS_1_PLUS
, OPT_fomit_frame_pointer
, NULL
, 1 },
202 { OPT_LEVELS_NONE
, 0, NULL
, 0 }
205 /* Initialize 'targetm' variable which contains pointers to functions and data
206 * relating to the target machine. */
208 struct gcc_target targetm
= TARGET_INITIALIZER
;
211 /*****************************************************************************/
212 /* TARGET HOOK IMPLEMENTATIONS */
213 /*****************************************************************************/
215 /* Return the fixed registers used for condition codes. */
218 crx_fixed_condition_code_regs (unsigned int *p1
, unsigned int *p2
)
221 *p2
= INVALID_REGNUM
;
225 /* Implements hook TARGET_STRUCT_VALUE_RTX. */
228 crx_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED
,
229 int incoming ATTRIBUTE_UNUSED
)
231 return gen_rtx_REG (Pmode
, CRX_STRUCT_VALUE_REGNUM
);
234 /* Implements hook TARGET_RETURN_IN_MEMORY. */
237 crx_return_in_memory (const_tree type
, const_tree fntype ATTRIBUTE_UNUSED
)
239 if (TYPE_MODE (type
) == BLKmode
)
241 HOST_WIDE_INT size
= int_size_in_bytes (type
);
242 return (size
== -1 || size
> 8);
249 /*****************************************************************************/
250 /* MACRO IMPLEMENTATIONS */
251 /*****************************************************************************/
253 /* STACK LAYOUT AND CALLING CONVENTIONS ROUTINES */
254 /* --------------------------------------------- */
256 /* Return nonzero if the current function being compiled is an interrupt
257 * function as specified by the "interrupt" attribute. */
260 crx_interrupt_function_p (void)
264 attributes
= TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl
));
265 return lookup_attribute ("interrupt", attributes
) != NULL_TREE
;
268 /* Compute values for the array save_regs and the variable sum_regs. The index
269 * of save_regs is numbers of register, each will get 1 if we need to save it
270 * in the current function, 0 if not. sum_regs is the total sum of the
271 * registers being saved. */
274 crx_compute_save_regs (void)
278 /* initialize here so in case the function is no-return it will be -1. */
279 last_reg_to_save
= -1;
281 /* No need to save any registers if the function never returns. */
282 if (FUNC_IS_NORETURN_P (current_function_decl
))
285 /* Initialize the number of bytes to be saved. */
288 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
290 if (fixed_regs
[regno
])
292 save_regs
[regno
] = 0;
296 /* If this reg is used and not call-used (except RA), save it. */
297 if (crx_interrupt_function_p ())
299 if (!current_function_is_leaf
&& call_used_regs
[regno
])
300 /* this is a volatile reg in a non-leaf interrupt routine - save it
301 * for the sake of its sons. */
302 save_regs
[regno
] = 1;
304 else if (df_regs_ever_live_p (regno
))
305 /* This reg is used - save it. */
306 save_regs
[regno
] = 1;
308 /* This reg is not used, and is not a volatile - don't save. */
309 save_regs
[regno
] = 0;
313 /* If this reg is used and not call-used (except RA), save it. */
314 if (df_regs_ever_live_p (regno
)
315 && (!call_used_regs
[regno
] || regno
== RETURN_ADDRESS_REGNUM
))
316 save_regs
[regno
] = 1;
318 save_regs
[regno
] = 0;
322 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
323 if (save_regs
[regno
] == 1)
325 last_reg_to_save
= regno
;
326 sum_regs
+= UNITS_PER_WORD
;
330 /* Compute the size of the local area and the size to be adjusted by the
331 * prologue and epilogue. */
334 crx_compute_frame (void)
336 /* For aligning the local variables. */
337 int stack_alignment
= STACK_BOUNDARY
/ BITS_PER_UNIT
;
340 /* Padding needed for each element of the frame. */
341 local_vars_size
= get_frame_size ();
343 /* Align to the stack alignment. */
344 padding_locals
= local_vars_size
% stack_alignment
;
346 padding_locals
= stack_alignment
- padding_locals
;
348 local_vars_size
+= padding_locals
;
350 size_for_adjusting_sp
= local_vars_size
+ (ACCUMULATE_OUTGOING_ARGS
?
351 crtl
->outgoing_args_size
: 0);
354 /* Worker function for TARGET_CAN_ELIMINATE. */
357 crx_can_eliminate (const int from ATTRIBUTE_UNUSED
, const int to
)
359 return (to
== STACK_POINTER_REGNUM
? ! frame_pointer_needed
: true);
362 /* Implements the macro INITIAL_ELIMINATION_OFFSET, return the OFFSET. */
365 crx_initial_elimination_offset (int from
, int to
)
367 /* Compute this since we need to use sum_regs. */
368 crx_compute_save_regs ();
370 /* Compute this since we need to use local_vars_size. */
371 crx_compute_frame ();
373 if ((from
) == FRAME_POINTER_REGNUM
&& (to
) == STACK_POINTER_REGNUM
)
374 return (ACCUMULATE_OUTGOING_ARGS
?
375 crtl
->outgoing_args_size
: 0);
376 else if ((from
) == ARG_POINTER_REGNUM
&& (to
) == FRAME_POINTER_REGNUM
)
377 return (sum_regs
+ local_vars_size
);
378 else if ((from
) == ARG_POINTER_REGNUM
&& (to
) == STACK_POINTER_REGNUM
)
379 return (sum_regs
+ local_vars_size
+
380 (ACCUMULATE_OUTGOING_ARGS
?
381 crtl
->outgoing_args_size
: 0));
389 /* Return the class number of the smallest class containing reg number REGNO.
390 * This could be a conditional expression or could index an array. */
393 crx_regno_reg_class (int regno
)
395 if (regno
>= 0 && regno
< SP_REGNUM
)
398 if (regno
== SP_REGNUM
)
401 if (regno
== LO_REGNUM
)
403 if (regno
== HI_REGNUM
)
409 /* Transfer between HILO_REGS and memory via secondary reloading. */
412 crx_secondary_reload_class (enum reg_class rclass
,
413 enum machine_mode mode ATTRIBUTE_UNUSED
,
414 rtx x ATTRIBUTE_UNUSED
)
416 if (reg_classes_intersect_p (rclass
, HILO_REGS
)
417 && true_regnum (x
) == -1)
423 /* Return 1 if hard register REGNO can hold a value of machine-mode MODE. */
426 crx_hard_regno_mode_ok (int regno
, enum machine_mode mode
)
428 /* CC can only hold CCmode values. */
429 if (regno
== CC_REGNUM
)
430 return GET_MODE_CLASS (mode
) == MODE_CC
;
431 if (GET_MODE_CLASS (mode
) == MODE_CC
)
433 /* HILO registers can only hold SImode and DImode */
434 if (HILO_REGNO_P (regno
))
435 return mode
== SImode
|| mode
== DImode
;
439 /* PASSING FUNCTION ARGUMENTS */
440 /* -------------------------- */
442 /* If enough param regs are available for passing the param of type TYPE return
443 * the number of registers needed else 0. */
446 enough_regs_for_param (CUMULATIVE_ARGS
* cum
, const_tree type
,
447 enum machine_mode mode
)
453 type_size
= GET_MODE_BITSIZE (mode
);
455 type_size
= int_size_in_bytes (type
) * BITS_PER_UNIT
;
458 BITS_PER_WORD
* (MAX_REG_FOR_PASSING_ARGS
-
459 (MIN_REG_FOR_PASSING_ARGS
+ cum
->ints
) + 1);
461 /* Any variable which is too big to pass in two registers, will pass on
463 if ((remaining_size
>= type_size
) && (type_size
<= 2 * BITS_PER_WORD
))
464 return (type_size
+ BITS_PER_WORD
- 1) / BITS_PER_WORD
;
469 /* Implements TARGET_FUNCTION_ARG. */
472 crx_function_arg (CUMULATIVE_ARGS
* cum
, enum machine_mode mode
,
473 const_tree type
, bool named ATTRIBUTE_UNUSED
)
475 last_parm_in_reg
= 0;
477 /* Function_arg () is called with this type just after all the args have had
478 * their registers assigned. The rtx that function_arg returns from this type
479 * is supposed to pass to 'gen_call' but currently it is not implemented (see
480 * macro GEN_CALL). */
481 if (type
== void_type_node
)
484 if (targetm
.calls
.must_pass_in_stack (mode
, type
) || (cum
->ints
< 0))
489 /* Enable structures that need padding bytes at the end to pass to a
490 * function in registers. */
491 if (enough_regs_for_param (cum
, type
, mode
) != 0)
493 last_parm_in_reg
= 1;
494 return gen_rtx_REG (mode
, MIN_REG_FOR_PASSING_ARGS
+ cum
->ints
);
498 if (MIN_REG_FOR_PASSING_ARGS
+ cum
->ints
> MAX_REG_FOR_PASSING_ARGS
)
502 if (enough_regs_for_param (cum
, type
, mode
) != 0)
504 last_parm_in_reg
= 1;
505 return gen_rtx_REG (mode
, MIN_REG_FOR_PASSING_ARGS
+ cum
->ints
);
512 /* Implements the macro INIT_CUMULATIVE_ARGS defined in crx.h. */
515 crx_init_cumulative_args (CUMULATIVE_ARGS
* cum
, tree fntype
,
516 rtx libfunc ATTRIBUTE_UNUSED
)
518 tree param
, next_param
;
522 /* Determine if this function has variable arguments. This is indicated by
523 * the last argument being 'void_type_mode' if there are no variable
524 * arguments. Change here for a different vararg. */
525 for (param
= (fntype
) ? TYPE_ARG_TYPES (fntype
) : 0;
526 param
!= (tree
) 0; param
= next_param
)
528 next_param
= TREE_CHAIN (param
);
529 if (next_param
== (tree
) 0 && TREE_VALUE (param
) != void_type_node
)
537 /* Implements TARGET_FUNCTION_ARG_ADVANCE. */
540 crx_function_arg_advance (CUMULATIVE_ARGS
* cum
, enum machine_mode mode
,
541 const_tree type
, bool named ATTRIBUTE_UNUSED
)
543 /* l holds the number of registers required */
544 int l
= GET_MODE_BITSIZE (mode
) / BITS_PER_WORD
;
546 /* If the parameter isn't passed on a register don't advance cum. */
547 if (!last_parm_in_reg
)
550 if (targetm
.calls
.must_pass_in_stack (mode
, type
) || (cum
->ints
< 0))
553 if (mode
== SImode
|| mode
== HImode
|| mode
== QImode
|| mode
== DImode
)
560 else if (mode
== SFmode
|| mode
== DFmode
)
562 else if ((mode
) == BLKmode
)
564 if ((l
= enough_regs_for_param (cum
, type
, mode
)) != 0)
570 /* Implements the macro FUNCTION_ARG_REGNO_P defined in crx.h. Return nonzero
571 * if N is a register used for passing parameters. */
574 crx_function_arg_regno_p (int n
)
576 return (n
<= MAX_REG_FOR_PASSING_ARGS
&& n
>= MIN_REG_FOR_PASSING_ARGS
);
579 /* ADDRESSING MODES */
580 /* ---------------- */
582 /* Implements the hook for TARGET_LEGITIMATE_ADDRESS_P defined in crx.h.
583 * The following addressing modes are supported on CRX:
585 * Relocations --> const | symbol_ref | label_ref
586 * Absolute address --> 32-bit absolute
587 * Post increment --> reg + 12-bit disp.
588 * Post modify --> reg + 12-bit disp.
589 * Register relative --> reg | 32-bit disp. + reg | 4 bit + reg
590 * Scaled index --> reg + reg | 22-bit disp. + reg + reg |
591 * 22-disp. + reg + reg + (2 | 4 | 8) */
594 crx_addr_reg (rtx addr_reg
)
596 if (GET_MODE (addr_reg
) != Pmode
)
599 if (REG_P (addr_reg
))
601 else if (GET_CODE (addr_reg
) == SUBREG
602 && REG_P (SUBREG_REG (addr_reg
))
603 && (GET_MODE_SIZE (GET_MODE (SUBREG_REG (addr_reg
)))
605 return SUBREG_REG (addr_reg
);
611 crx_decompose_address (rtx addr
, struct crx_address
*out
)
613 rtx base
= NULL_RTX
, index
= NULL_RTX
, disp
= NULL_RTX
;
614 rtx scale_rtx
= NULL_RTX
, side_effect
= NULL_RTX
;
617 enum crx_addrtype retval
= CRX_INVALID
;
619 switch (GET_CODE (addr
))
622 /* Absolute address (known at compile time) */
623 retval
= CRX_ABSOLUTE
;
625 if (!UNSIGNED_INT_FITS_N_BITS (INTVAL (disp
), GET_MODE_BITSIZE (Pmode
)))
632 /* Absolute address (known at link time) */
633 retval
= CRX_ABSOLUTE
;
639 /* Register relative address */
640 retval
= CRX_REG_REL
;
645 switch (GET_CODE (XEXP (addr
, 0)))
649 if (REG_P (XEXP (addr
, 1)))
651 /* Scaled index with scale = 1 and disp. = 0 */
652 retval
= CRX_SCALED_INDX
;
653 base
= XEXP (addr
, 1);
654 index
= XEXP (addr
, 0);
657 else if (RTX_SIGNED_INT_FITS_N_BITS (XEXP (addr
, 1), 28))
659 /* Register relative address and <= 28-bit disp. */
660 retval
= CRX_REG_REL
;
661 base
= XEXP (addr
, 0);
662 disp
= XEXP (addr
, 1);
669 /* Scaled index and <= 22-bit disp. */
670 retval
= CRX_SCALED_INDX
;
671 base
= XEXP (XEXP (addr
, 0), 1);
672 disp
= XEXP (addr
, 1);
673 if (!RTX_SIGNED_INT_FITS_N_BITS (disp
, 22))
675 switch (GET_CODE (XEXP (XEXP (addr
, 0), 0)))
678 /* Scaled index with scale = 0 and <= 22-bit disp. */
679 index
= XEXP (XEXP (addr
, 0), 0);
684 /* Scaled index with scale >= 0 and <= 22-bit disp. */
685 index
= XEXP (XEXP (XEXP (addr
, 0), 0), 0);
686 scale_rtx
= XEXP (XEXP (XEXP (addr
, 0), 0), 1);
687 if ((scale
= SCALE_FOR_INDEX_P (scale_rtx
)) == -1)
697 /* Scaled index with scale >= 0 */
698 retval
= CRX_SCALED_INDX
;
699 base
= XEXP (addr
, 1);
700 index
= XEXP (XEXP (addr
, 0), 0);
701 scale_rtx
= XEXP (XEXP (addr
, 0), 1);
702 /* Scaled index with scale >= 0 and <= 22-bit disp. */
703 if ((scale
= SCALE_FOR_INDEX_P (scale_rtx
)) == -1)
714 /* Simple post-increment */
715 retval
= CRX_POST_INC
;
716 base
= XEXP (addr
, 0);
721 /* Generic post-increment with <= 12-bit disp. */
722 retval
= CRX_POST_INC
;
723 base
= XEXP (addr
, 0);
724 side_effect
= XEXP (addr
, 1);
725 if (base
!= XEXP (side_effect
, 0))
727 switch (GET_CODE (side_effect
))
731 disp
= XEXP (side_effect
, 1);
732 if (!RTX_SIGNED_INT_FITS_N_BITS (disp
, 12))
737 /* CRX only supports PLUS and MINUS */
748 base
= crx_addr_reg (base
);
754 index
= crx_addr_reg (index
);
763 out
->side_effect
= side_effect
;
769 crx_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED
,
770 rtx addr
, bool strict
)
772 enum crx_addrtype addrtype
;
773 struct crx_address address
;
775 if (TARGET_DEBUG_ADDR
)
778 "\n======\nGO_IF_LEGITIMATE_ADDRESS, mode = %s, strict = %d\n",
779 GET_MODE_NAME (mode
), strict
);
783 addrtype
= crx_decompose_address (addr
, &address
);
785 if (addrtype
== CRX_POST_INC
&& GET_MODE_SIZE (mode
) > UNITS_PER_WORD
)
788 if (TARGET_DEBUG_ADDR
)
797 typestr
= "Register relative";
800 typestr
= "Post-increment";
802 case CRX_SCALED_INDX
:
803 typestr
= "Scaled index";
806 typestr
= "Absolute";
811 fprintf (stderr
, "CRX Address type: %s\n", typestr
);
814 if (addrtype
== CRX_INVALID
)
819 if (address
.base
&& !REGNO_OK_FOR_BASE_P (REGNO (address
.base
)))
821 if (TARGET_DEBUG_ADDR
)
822 fprintf (stderr
, "Base register not strict\n");
825 if (address
.index
&& !REGNO_OK_FOR_INDEX_P (REGNO (address
.index
)))
827 if (TARGET_DEBUG_ADDR
)
828 fprintf (stderr
, "Index register not strict\n");
836 /* ROUTINES TO COMPUTE COSTS */
837 /* ------------------------- */
839 /* Return cost of the memory address x. */
842 crx_address_cost (rtx addr
, bool speed ATTRIBUTE_UNUSED
)
844 enum crx_addrtype addrtype
;
845 struct crx_address address
;
849 addrtype
= crx_decompose_address (addr
, &address
);
851 gcc_assert (addrtype
!= CRX_INVALID
);
853 /* An absolute address causes a 3-word instruction */
854 if (addrtype
== CRX_ABSOLUTE
)
857 /* Post-modifying addresses are more powerful. */
858 if (addrtype
== CRX_POST_INC
)
861 /* Attempt to minimize number of registers in the address. */
865 if (address
.index
&& address
.scale
== 1)
868 if (address
.disp
&& !INT_CST4 (INTVAL (address
.disp
)))
871 if (TARGET_DEBUG_ADDR
)
873 fprintf (stderr
, "\n======\nTARGET_ADDRESS_COST = %d\n", cost
);
880 /* Return the cost of moving data of mode MODE between a register of class
881 * RCLASS and memory; IN is zero if the value is to be written to memory,
882 * nonzero if it is to be read in. This cost is relative to those in
883 * REGISTER_MOVE_COST. */
886 crx_memory_move_cost (enum machine_mode mode
,
887 enum reg_class rclass ATTRIBUTE_UNUSED
,
888 int in ATTRIBUTE_UNUSED
)
890 /* One LD or ST takes twice the time of a simple reg-reg move */
891 if (reg_classes_intersect_p (rclass
, GENERAL_REGS
))
893 /* printf ("GENERAL_REGS LD/ST = %d\n", 4 * HARD_REGNO_NREGS (0, mode));*/
894 return 4 * HARD_REGNO_NREGS (0, mode
);
896 else if (reg_classes_intersect_p (rclass
, HILO_REGS
))
898 /* HILO to memory and vice versa */
899 /* printf ("HILO_REGS %s = %d\n", in ? "LD" : "ST",
900 (REGISTER_MOVE_COST (mode,
901 in ? GENERAL_REGS : HILO_REGS,
902 in ? HILO_REGS : GENERAL_REGS) + 4)
903 * HARD_REGNO_NREGS (0, mode)); */
904 return (REGISTER_MOVE_COST (mode
,
905 in
? GENERAL_REGS
: HILO_REGS
,
906 in
? HILO_REGS
: GENERAL_REGS
) + 4)
907 * HARD_REGNO_NREGS (0, mode
);
909 else /* default (like in i386) */
911 /* printf ("ANYREGS = 100\n"); */
916 /* INSTRUCTION OUTPUT */
917 /* ------------------ */
919 /* Check if a const_double is ok for crx store-immediate instructions */
922 crx_const_double_ok (rtx op
)
924 if (GET_MODE (op
) == DFmode
)
928 REAL_VALUE_FROM_CONST_DOUBLE (r
, op
);
929 REAL_VALUE_TO_TARGET_DOUBLE (r
, l
);
930 return (UNSIGNED_INT_FITS_N_BITS (l
[0], 4) &&
931 UNSIGNED_INT_FITS_N_BITS (l
[1], 4)) ? 1 : 0;
934 if (GET_MODE (op
) == SFmode
)
938 REAL_VALUE_FROM_CONST_DOUBLE (r
, op
);
939 REAL_VALUE_TO_TARGET_SINGLE (r
, l
);
940 return UNSIGNED_INT_FITS_N_BITS (l
, 4) ? 1 : 0;
943 return (UNSIGNED_INT_FITS_N_BITS (CONST_DOUBLE_LOW (op
), 4) &&
944 UNSIGNED_INT_FITS_N_BITS (CONST_DOUBLE_HIGH (op
), 4)) ? 1 : 0;
947 /* Implements the macro PRINT_OPERAND defined in crx.h. */
950 crx_print_operand (FILE * file
, rtx x
, int code
)
955 if (GET_CODE (x
) == REG
) {
956 if (GET_MODE (x
) == DImode
|| GET_MODE (x
) == DFmode
)
958 int regno
= REGNO (x
);
959 if (regno
+ 1 >= SP_REGNUM
) abort ();
960 fprintf (file
, "{%s, %s}", reg_names
[regno
], reg_names
[regno
+ 1]);
965 if (REGNO (x
) >= SP_REGNUM
) abort ();
966 fprintf (file
, "%s", reg_names
[REGNO (x
)]);
973 const char *crx_cmp_str
;
974 switch (GET_CODE (x
))
975 { /* MD: compare (reg, reg or imm) but CRX: cmp (reg or imm, reg)
976 * -> swap all non symmetric ops */
977 case EQ
: crx_cmp_str
= "eq"; break;
978 case NE
: crx_cmp_str
= "ne"; break;
979 case GT
: crx_cmp_str
= "lt"; break;
980 case GTU
: crx_cmp_str
= "lo"; break;
981 case LT
: crx_cmp_str
= "gt"; break;
982 case LTU
: crx_cmp_str
= "hi"; break;
983 case GE
: crx_cmp_str
= "le"; break;
984 case GEU
: crx_cmp_str
= "ls"; break;
985 case LE
: crx_cmp_str
= "ge"; break;
986 case LEU
: crx_cmp_str
= "hs"; break;
989 fprintf (file
, "%s", crx_cmp_str
);
994 /* Print high part of a double precision value. */
995 switch (GET_CODE (x
))
998 if (GET_MODE (x
) == SFmode
) abort ();
999 if (GET_MODE (x
) == DFmode
)
1001 /* High part of a DF const. */
1005 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
1006 REAL_VALUE_TO_TARGET_DOUBLE (r
, l
);
1008 fprintf (file
, "$0x%lx", l
[1]);
1012 /* -- Fallthrough to handle DI consts -- */
1017 split_double (x
, &low
, &high
);
1019 output_addr_const (file
, high
);
1024 if (REGNO (x
) + 1 >= FIRST_PSEUDO_REGISTER
) abort ();
1025 fprintf (file
, "%s", reg_names
[REGNO (x
) + 1]);
1029 /* Adjust memory address to high part. */
1032 adj_mem
= adjust_address (adj_mem
, GET_MODE (adj_mem
), 4);
1034 output_memory_reference_mode
= GET_MODE (adj_mem
);
1035 output_address (XEXP (adj_mem
, 0));
1044 /* Print low part of a double precision value. */
1045 switch (GET_CODE (x
))
1048 if (GET_MODE (x
) == SFmode
) abort ();
1049 if (GET_MODE (x
) == DFmode
)
1051 /* High part of a DF const. */
1055 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
1056 REAL_VALUE_TO_TARGET_DOUBLE (r
, l
);
1058 fprintf (file
, "$0x%lx", l
[0]);
1062 /* -- Fallthrough to handle DI consts -- */
1067 split_double (x
, &low
, &high
);
1069 output_addr_const (file
, low
);
1074 fprintf (file
, "%s", reg_names
[REGNO (x
)]);
1078 output_memory_reference_mode
= GET_MODE (x
);
1079 output_address (XEXP (x
, 0));
1086 case 0 : /* default */
1087 switch (GET_CODE (x
))
1090 fprintf (file
, "%s", reg_names
[REGNO (x
)]);
1094 output_memory_reference_mode
= GET_MODE (x
);
1095 output_address (XEXP (x
, 0));
1103 /* Always use H and L for double precision - see above */
1104 gcc_assert (GET_MODE (x
) == SFmode
);
1106 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
1107 REAL_VALUE_TO_TARGET_SINGLE (r
, l
);
1109 fprintf (file
, "$0x%lx", l
);
1115 output_addr_const (file
, x
);
1120 output_operand_lossage ("invalid %%xn code");
1126 /* Implements the macro PRINT_OPERAND_ADDRESS defined in crx.h. */
1129 crx_print_operand_address (FILE * file
, rtx addr
)
1131 enum crx_addrtype addrtype
;
1132 struct crx_address address
;
1136 addrtype
= crx_decompose_address (addr
, &address
);
1139 offset
= INTVAL (address
.disp
);
1146 fprintf (file
, "%d(%s)", offset
, reg_names
[REGNO (address
.base
)]);
1150 switch (GET_CODE (address
.side_effect
))
1158 offset
= GET_MODE_SIZE (output_memory_reference_mode
);
1161 offset
= -GET_MODE_SIZE (output_memory_reference_mode
);
1166 fprintf (file
, "%d(%s)+", offset
, reg_names
[REGNO (address
.base
)]);
1169 case CRX_SCALED_INDX
:
1170 fprintf (file
, "%d(%s, %s, %d)", offset
, reg_names
[REGNO (address
.base
)],
1171 reg_names
[REGNO (address
.index
)], address
.scale
);
1175 output_addr_const (file
, address
.disp
);
1184 /*****************************************************************************/
1185 /* MACHINE DESCRIPTION HELPER-FUNCTIONS */
1186 /*****************************************************************************/
1188 void crx_expand_movmem_single (rtx src
, rtx srcbase
, rtx dst
, rtx dstbase
,
1189 rtx tmp_reg
, unsigned HOST_WIDE_INT
*offset_p
)
1192 unsigned HOST_WIDE_INT offset
= *offset_p
;
1195 addr
= plus_constant (src
, offset
);
1196 mem
= adjust_automodify_address (srcbase
, SImode
, addr
, offset
);
1197 emit_move_insn (tmp_reg
, mem
);
1200 addr
= plus_constant (dst
, offset
);
1201 mem
= adjust_automodify_address (dstbase
, SImode
, addr
, offset
);
1202 emit_move_insn (mem
, tmp_reg
);
1204 *offset_p
= offset
+ 4;
1208 crx_expand_movmem (rtx dstbase
, rtx srcbase
, rtx count_exp
, rtx align_exp
)
1210 unsigned HOST_WIDE_INT count
= 0, offset
, si_moves
, i
;
1211 HOST_WIDE_INT align
= 0;
1216 if (GET_CODE (align_exp
) == CONST_INT
)
1217 { /* Only if aligned */
1218 align
= INTVAL (align_exp
);
1223 if (GET_CODE (count_exp
) == CONST_INT
)
1224 { /* No more than 16 SImode moves */
1225 count
= INTVAL (count_exp
);
1230 tmp_reg
= gen_reg_rtx (SImode
);
1232 /* Create psrs for the src and dest pointers */
1233 dst
= copy_to_mode_reg (Pmode
, XEXP (dstbase
, 0));
1234 if (dst
!= XEXP (dstbase
, 0))
1235 dstbase
= replace_equiv_address_nv (dstbase
, dst
);
1236 src
= copy_to_mode_reg (Pmode
, XEXP (srcbase
, 0));
1237 if (src
!= XEXP (srcbase
, 0))
1238 srcbase
= replace_equiv_address_nv (srcbase
, src
);
1242 /* Emit SImode moves */
1243 si_moves
= count
>> 2;
1244 for (i
= 0; i
< si_moves
; i
++)
1245 crx_expand_movmem_single (src
, srcbase
, dst
, dstbase
, tmp_reg
, &offset
);
1251 crx_expand_movmem_single (src
, srcbase
, dst
, dstbase
, tmp_reg
, &offset
);
1254 gcc_assert (offset
== count
);
1260 mpushpop_str (char *stringbuffer
, const char *mnemonic
, char *mask
)
1262 if (strlen (mask
) > 2 || crx_interrupt_function_p ()) /* needs 2-word instr. */
1263 sprintf (stringbuffer
, "\n\t%s\tsp, {%s}", mnemonic
, mask
);
1264 else /* single word instruction */
1265 sprintf (stringbuffer
, "\n\t%s\t%s", mnemonic
, mask
);
1268 /* Called from crx.md. The return value depends on the parameter push_or_pop:
1269 * When push_or_pop is zero -> string for push instructions of prologue.
1270 * When push_or_pop is nonzero -> string for pop/popret/retx in epilogue.
1271 * Relies on the assumptions:
1272 * 1. RA is the last register to be saved.
1273 * 2. The maximal value of the counter is MAX_COUNT. */
1276 crx_prepare_push_pop_string (int push_or_pop
)
1278 /* j is the number of registers being saved, takes care that there won't be
1279 * more than 8 in one push/pop instruction */
1281 /* For the register mask string */
1282 static char mask_str
[50];
1284 /* i is the index of save_regs[], going from 0 until last_reg_to_save */
1287 int ra_in_bitmask
= 0;
1291 /* For reversing on the push instructions if there are more than one. */
1294 return_str
= (char *) xmalloc (120);
1295 temp_str
= (char *) xmalloc (120);
1298 memset (return_str
, 0, 3);
1300 while (i
<= last_reg_to_save
)
1302 /* Prepare mask for one instruction. */
1306 { /* Add regs unit full or SP register reached */
1308 while (j
< MAX_COUNT
&& i
<= SP_REGNUM
)
1312 /* TODO to use ra_in_bitmask for detecting last pop is not
1313 * smart it prevents things like: popret r5 */
1314 if (i
== RETURN_ADDRESS_REGNUM
) ra_in_bitmask
= 1;
1315 if (j
> 0) strcat (mask_str
, ", ");
1316 strcat (mask_str
, reg_names
[i
]);
1324 /* Handle hi/lo savings */
1325 while (i
<= last_reg_to_save
)
1329 strcat (mask_str
, "lo, hi");
1330 i
= last_reg_to_save
+ 1;
1337 if (strlen (mask_str
) == 0) continue;
1339 if (push_or_pop
== 1)
1341 if (crx_interrupt_function_p ())
1342 mpushpop_str (temp_str
, "popx", mask_str
);
1347 mpushpop_str (temp_str
, "popret", mask_str
);
1350 else mpushpop_str (temp_str
, "pop", mask_str
);
1353 strcat (return_str
, temp_str
);
1357 /* push - We need to reverse the order of the instructions if there
1358 * are more than one. (since the pop will not be reversed in the
1360 if (crx_interrupt_function_p ())
1361 mpushpop_str (temp_str
, "pushx", mask_str
);
1363 mpushpop_str (temp_str
, "push", mask_str
);
1364 strcat (temp_str
, return_str
);
1365 strcpy (strcat (return_str
, "\t"), temp_str
);
1370 if (push_or_pop
== 1)
1373 if (crx_interrupt_function_p ())
1374 strcat (return_str
, "\n\tretx\n");
1376 else if (!FUNC_IS_NORETURN_P (current_function_decl
)
1377 && !save_regs
[RETURN_ADDRESS_REGNUM
])
1378 strcat (return_str
, "\n\tjump\tra\n");
1381 /* Skip the newline and the tab in the start of return_str. */
1386 /* CompactRISC CRX Architecture stack layout:
1388 0 +---------------------
1393 +==================== Sp(x)=Ap(x+1)
1394 A | Args for functions
1395 | | called by X and Dynamically
1396 | | Dynamic allocations allocated and
1397 | | (alloca, variable deallocated
1398 Stack | length arrays).
1399 grows +-------------------- Fp(x)
1400 down| | Local variables of X
1401 ward| +--------------------
1402 | | Regs saved for X-1
1403 | +==================== Sp(x-1)=Ap(x)
1406 +-------------------- Fp(x-1)
1414 crx_expand_prologue (void)
1416 crx_compute_frame ();
1417 crx_compute_save_regs ();
1419 /* If there is no need in push and adjustment to sp, return. */
1420 if (size_for_adjusting_sp
+ sum_regs
== 0)
1423 if (last_reg_to_save
!= -1)
1424 /* If there are registers to push. */
1425 emit_insn (gen_push_for_prologue (GEN_INT (sum_regs
)));
1427 if (size_for_adjusting_sp
> 0)
1428 emit_insn (gen_addsi3 (stack_pointer_rtx
, stack_pointer_rtx
,
1429 GEN_INT (-size_for_adjusting_sp
)));
1431 if (frame_pointer_needed
)
1432 /* Initialize the frame pointer with the value of the stack pointer
1433 * pointing now to the locals. */
1434 emit_move_insn (frame_pointer_rtx
, stack_pointer_rtx
);
1437 /* Generate insn that updates the stack for local variables and padding for
1438 * registers we save. - Generate the appropriate return insn. */
1441 crx_expand_epilogue (void)
1443 /* Nonzero if we need to return and pop only RA. This will generate a
1444 * different insn. This differentiate is for the peepholes for call as last
1445 * statement in function. */
1446 int only_popret_RA
= (save_regs
[RETURN_ADDRESS_REGNUM
]
1447 && (sum_regs
== UNITS_PER_WORD
));
1449 if (frame_pointer_needed
)
1450 /* Restore the stack pointer with the frame pointers value */
1451 emit_move_insn (stack_pointer_rtx
, frame_pointer_rtx
);
1453 if (size_for_adjusting_sp
> 0)
1454 emit_insn (gen_addsi3 (stack_pointer_rtx
, stack_pointer_rtx
,
1455 GEN_INT (size_for_adjusting_sp
)));
1457 if (crx_interrupt_function_p ())
1458 emit_jump_insn (gen_interrupt_return ());
1459 else if (last_reg_to_save
== -1)
1460 /* Nothing to pop */
1461 /* Don't output jump for interrupt routine, only retx. */
1462 emit_jump_insn (gen_indirect_jump_return ());
1463 else if (only_popret_RA
)
1464 emit_jump_insn (gen_popret_RA_return ());
1466 emit_jump_insn (gen_pop_and_popret_return (GEN_INT (sum_regs
)));