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 void crx_option_optimization (int, int);
135 /*****************************************************************************/
137 /*****************************************************************************/
139 #undef TARGET_LEGITIMATE_ADDRESS_P
140 #define TARGET_LEGITIMATE_ADDRESS_P crx_legitimate_address_p
142 #undef TARGET_CAN_ELIMINATE
143 #define TARGET_CAN_ELIMINATE crx_can_eliminate
145 /*****************************************************************************/
146 /* STACK LAYOUT AND CALLING CONVENTIONS */
147 /*****************************************************************************/
149 #undef TARGET_FIXED_CONDITION_CODE_REGS
150 #define TARGET_FIXED_CONDITION_CODE_REGS crx_fixed_condition_code_regs
152 #undef TARGET_STRUCT_VALUE_RTX
153 #define TARGET_STRUCT_VALUE_RTX crx_struct_value_rtx
155 #undef TARGET_RETURN_IN_MEMORY
156 #define TARGET_RETURN_IN_MEMORY crx_return_in_memory
158 /*****************************************************************************/
159 /* RELATIVE COSTS OF OPERATIONS */
160 /*****************************************************************************/
162 #undef TARGET_ADDRESS_COST
163 #define TARGET_ADDRESS_COST crx_address_cost
165 /*****************************************************************************/
166 /* TARGET-SPECIFIC USES OF `__attribute__' */
167 /*****************************************************************************/
169 #undef TARGET_ATTRIBUTE_TABLE
170 #define TARGET_ATTRIBUTE_TABLE crx_attribute_table
172 static const struct attribute_spec crx_attribute_table
[] = {
173 /* ISRs have special prologue and epilogue requirements. */
174 {"interrupt", 0, 0, false, true, true, NULL
},
175 {NULL
, 0, 0, false, false, false, NULL
}
178 /* Option handling. */
180 #undef TARGET_OPTION_OPTIMIZATION
181 #define TARGET_OPTION_OPTIMIZATION crx_option_optimization
183 /* Initialize 'targetm' variable which contains pointers to functions and data
184 * relating to the target machine. */
186 struct gcc_target targetm
= TARGET_INITIALIZER
;
189 /*****************************************************************************/
190 /* TARGET HOOK IMPLEMENTATIONS */
191 /*****************************************************************************/
193 /* Return the fixed registers used for condition codes. */
196 crx_fixed_condition_code_regs (unsigned int *p1
, unsigned int *p2
)
199 *p2
= INVALID_REGNUM
;
203 /* Implements hook TARGET_STRUCT_VALUE_RTX. */
206 crx_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED
,
207 int incoming ATTRIBUTE_UNUSED
)
209 return gen_rtx_REG (Pmode
, CRX_STRUCT_VALUE_REGNUM
);
212 /* Implements hook TARGET_RETURN_IN_MEMORY. */
215 crx_return_in_memory (const_tree type
, const_tree fntype ATTRIBUTE_UNUSED
)
217 if (TYPE_MODE (type
) == BLKmode
)
219 HOST_WIDE_INT size
= int_size_in_bytes (type
);
220 return (size
== -1 || size
> 8);
227 /*****************************************************************************/
228 /* MACRO IMPLEMENTATIONS */
229 /*****************************************************************************/
231 /* STACK LAYOUT AND CALLING CONVENTIONS ROUTINES */
232 /* --------------------------------------------- */
234 /* Return nonzero if the current function being compiled is an interrupt
235 * function as specified by the "interrupt" attribute. */
238 crx_interrupt_function_p (void)
242 attributes
= TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl
));
243 return lookup_attribute ("interrupt", attributes
) != NULL_TREE
;
246 /* Compute values for the array save_regs and the variable sum_regs. The index
247 * of save_regs is numbers of register, each will get 1 if we need to save it
248 * in the current function, 0 if not. sum_regs is the total sum of the
249 * registers being saved. */
252 crx_compute_save_regs (void)
256 /* initialize here so in case the function is no-return it will be -1. */
257 last_reg_to_save
= -1;
259 /* No need to save any registers if the function never returns. */
260 if (FUNC_IS_NORETURN_P (current_function_decl
))
263 /* Initialize the number of bytes to be saved. */
266 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
268 if (fixed_regs
[regno
])
270 save_regs
[regno
] = 0;
274 /* If this reg is used and not call-used (except RA), save it. */
275 if (crx_interrupt_function_p ())
277 if (!current_function_is_leaf
&& call_used_regs
[regno
])
278 /* this is a volatile reg in a non-leaf interrupt routine - save it
279 * for the sake of its sons. */
280 save_regs
[regno
] = 1;
282 else if (df_regs_ever_live_p (regno
))
283 /* This reg is used - save it. */
284 save_regs
[regno
] = 1;
286 /* This reg is not used, and is not a volatile - don't save. */
287 save_regs
[regno
] = 0;
291 /* If this reg is used and not call-used (except RA), save it. */
292 if (df_regs_ever_live_p (regno
)
293 && (!call_used_regs
[regno
] || regno
== RETURN_ADDRESS_REGNUM
))
294 save_regs
[regno
] = 1;
296 save_regs
[regno
] = 0;
300 for (regno
= 0; regno
< FIRST_PSEUDO_REGISTER
; regno
++)
301 if (save_regs
[regno
] == 1)
303 last_reg_to_save
= regno
;
304 sum_regs
+= UNITS_PER_WORD
;
308 /* Compute the size of the local area and the size to be adjusted by the
309 * prologue and epilogue. */
312 crx_compute_frame (void)
314 /* For aligning the local variables. */
315 int stack_alignment
= STACK_BOUNDARY
/ BITS_PER_UNIT
;
318 /* Padding needed for each element of the frame. */
319 local_vars_size
= get_frame_size ();
321 /* Align to the stack alignment. */
322 padding_locals
= local_vars_size
% stack_alignment
;
324 padding_locals
= stack_alignment
- padding_locals
;
326 local_vars_size
+= padding_locals
;
328 size_for_adjusting_sp
= local_vars_size
+ (ACCUMULATE_OUTGOING_ARGS
?
329 crtl
->outgoing_args_size
: 0);
332 /* Worker function for TARGET_CAN_ELIMINATE. */
335 crx_can_eliminate (const int from ATTRIBUTE_UNUSED
, const int to
)
337 return (to
== STACK_POINTER_REGNUM
? ! frame_pointer_needed
: true);
340 /* Implements the macro INITIAL_ELIMINATION_OFFSET, return the OFFSET. */
343 crx_initial_elimination_offset (int from
, int to
)
345 /* Compute this since we need to use sum_regs. */
346 crx_compute_save_regs ();
348 /* Compute this since we need to use local_vars_size. */
349 crx_compute_frame ();
351 if ((from
) == FRAME_POINTER_REGNUM
&& (to
) == STACK_POINTER_REGNUM
)
352 return (ACCUMULATE_OUTGOING_ARGS
?
353 crtl
->outgoing_args_size
: 0);
354 else if ((from
) == ARG_POINTER_REGNUM
&& (to
) == FRAME_POINTER_REGNUM
)
355 return (sum_regs
+ local_vars_size
);
356 else if ((from
) == ARG_POINTER_REGNUM
&& (to
) == STACK_POINTER_REGNUM
)
357 return (sum_regs
+ local_vars_size
+
358 (ACCUMULATE_OUTGOING_ARGS
?
359 crtl
->outgoing_args_size
: 0));
367 /* Return the class number of the smallest class containing reg number REGNO.
368 * This could be a conditional expression or could index an array. */
371 crx_regno_reg_class (int regno
)
373 if (regno
>= 0 && regno
< SP_REGNUM
)
376 if (regno
== SP_REGNUM
)
379 if (regno
== LO_REGNUM
)
381 if (regno
== HI_REGNUM
)
387 /* Transfer between HILO_REGS and memory via secondary reloading. */
390 crx_secondary_reload_class (enum reg_class rclass
,
391 enum machine_mode mode ATTRIBUTE_UNUSED
,
392 rtx x ATTRIBUTE_UNUSED
)
394 if (reg_classes_intersect_p (rclass
, HILO_REGS
)
395 && true_regnum (x
) == -1)
401 /* Return 1 if hard register REGNO can hold a value of machine-mode MODE. */
404 crx_hard_regno_mode_ok (int regno
, enum machine_mode mode
)
406 /* CC can only hold CCmode values. */
407 if (regno
== CC_REGNUM
)
408 return GET_MODE_CLASS (mode
) == MODE_CC
;
409 if (GET_MODE_CLASS (mode
) == MODE_CC
)
411 /* HILO registers can only hold SImode and DImode */
412 if (HILO_REGNO_P (regno
))
413 return mode
== SImode
|| mode
== DImode
;
417 /* PASSING FUNCTION ARGUMENTS */
418 /* -------------------------- */
420 /* If enough param regs are available for passing the param of type TYPE return
421 * the number of registers needed else 0. */
424 enough_regs_for_param (CUMULATIVE_ARGS
* cum
, tree type
,
425 enum machine_mode mode
)
431 type_size
= GET_MODE_BITSIZE (mode
);
433 type_size
= int_size_in_bytes (type
) * BITS_PER_UNIT
;
436 BITS_PER_WORD
* (MAX_REG_FOR_PASSING_ARGS
-
437 (MIN_REG_FOR_PASSING_ARGS
+ cum
->ints
) + 1);
439 /* Any variable which is too big to pass in two registers, will pass on
441 if ((remaining_size
>= type_size
) && (type_size
<= 2 * BITS_PER_WORD
))
442 return (type_size
+ BITS_PER_WORD
- 1) / BITS_PER_WORD
;
447 /* Implements the macro FUNCTION_ARG defined in crx.h. */
450 crx_function_arg (CUMULATIVE_ARGS
* cum
, enum machine_mode mode
, tree type
,
451 int named ATTRIBUTE_UNUSED
)
453 last_parm_in_reg
= 0;
455 /* Function_arg () is called with this type just after all the args have had
456 * their registers assigned. The rtx that function_arg returns from this type
457 * is supposed to pass to 'gen_call' but currently it is not implemented (see
458 * macro GEN_CALL). */
459 if (type
== void_type_node
)
462 if (targetm
.calls
.must_pass_in_stack (mode
, type
) || (cum
->ints
< 0))
467 /* Enable structures that need padding bytes at the end to pass to a
468 * function in registers. */
469 if (enough_regs_for_param (cum
, type
, mode
) != 0)
471 last_parm_in_reg
= 1;
472 return gen_rtx_REG (mode
, MIN_REG_FOR_PASSING_ARGS
+ cum
->ints
);
476 if (MIN_REG_FOR_PASSING_ARGS
+ cum
->ints
> MAX_REG_FOR_PASSING_ARGS
)
480 if (enough_regs_for_param (cum
, type
, mode
) != 0)
482 last_parm_in_reg
= 1;
483 return gen_rtx_REG (mode
, MIN_REG_FOR_PASSING_ARGS
+ cum
->ints
);
490 /* Implements the macro INIT_CUMULATIVE_ARGS defined in crx.h. */
493 crx_init_cumulative_args (CUMULATIVE_ARGS
* cum
, tree fntype
,
494 rtx libfunc ATTRIBUTE_UNUSED
)
496 tree param
, next_param
;
500 /* Determine if this function has variable arguments. This is indicated by
501 * the last argument being 'void_type_mode' if there are no variable
502 * arguments. Change here for a different vararg. */
503 for (param
= (fntype
) ? TYPE_ARG_TYPES (fntype
) : 0;
504 param
!= (tree
) 0; param
= next_param
)
506 next_param
= TREE_CHAIN (param
);
507 if (next_param
== (tree
) 0 && TREE_VALUE (param
) != void_type_node
)
515 /* Implements the macro FUNCTION_ARG_ADVANCE defined in crx.h. */
518 crx_function_arg_advance (CUMULATIVE_ARGS
* cum
, enum machine_mode mode
,
519 tree type
, int named ATTRIBUTE_UNUSED
)
521 /* l holds the number of registers required */
522 int l
= GET_MODE_BITSIZE (mode
) / BITS_PER_WORD
;
524 /* If the parameter isn't passed on a register don't advance cum. */
525 if (!last_parm_in_reg
)
528 if (targetm
.calls
.must_pass_in_stack (mode
, type
) || (cum
->ints
< 0))
531 if (mode
== SImode
|| mode
== HImode
|| mode
== QImode
|| mode
== DImode
)
538 else if (mode
== SFmode
|| mode
== DFmode
)
540 else if ((mode
) == BLKmode
)
542 if ((l
= enough_regs_for_param (cum
, type
, mode
)) != 0)
548 /* Implements the macro FUNCTION_ARG_REGNO_P defined in crx.h. Return nonzero
549 * if N is a register used for passing parameters. */
552 crx_function_arg_regno_p (int n
)
554 return (n
<= MAX_REG_FOR_PASSING_ARGS
&& n
>= MIN_REG_FOR_PASSING_ARGS
);
557 /* ADDRESSING MODES */
558 /* ---------------- */
560 /* Implements the hook for TARGET_LEGITIMATE_ADDRESS_P defined in crx.h.
561 * The following addressing modes are supported on CRX:
563 * Relocations --> const | symbol_ref | label_ref
564 * Absolute address --> 32-bit absolute
565 * Post increment --> reg + 12-bit disp.
566 * Post modify --> reg + 12-bit disp.
567 * Register relative --> reg | 32-bit disp. + reg | 4 bit + reg
568 * Scaled index --> reg + reg | 22-bit disp. + reg + reg |
569 * 22-disp. + reg + reg + (2 | 4 | 8) */
571 static int crx_addr_reg_p (rtx addr_reg
)
575 if (REG_P (addr_reg
))
579 else if ((GET_CODE (addr_reg
) == SUBREG
580 && REG_P (SUBREG_REG (addr_reg
))
581 && GET_MODE_SIZE (GET_MODE (SUBREG_REG (addr_reg
)))
584 reg
= SUBREG_REG (addr_reg
);
589 if (GET_MODE (addr_reg
) != Pmode
)
598 crx_decompose_address (rtx addr
, struct crx_address
*out
)
600 rtx base
= NULL_RTX
, index
= NULL_RTX
, disp
= NULL_RTX
;
601 rtx scale_rtx
= NULL_RTX
, side_effect
= NULL_RTX
;
604 enum crx_addrtype retval
= CRX_INVALID
;
606 switch (GET_CODE (addr
))
609 /* Absolute address (known at compile time) */
610 retval
= CRX_ABSOLUTE
;
612 if (!UNSIGNED_INT_FITS_N_BITS (INTVAL (disp
), GET_MODE_BITSIZE (Pmode
)))
619 /* Absolute address (known at link time) */
620 retval
= CRX_ABSOLUTE
;
626 /* Register relative address */
627 retval
= CRX_REG_REL
;
632 switch (GET_CODE (XEXP (addr
, 0)))
636 if (REG_P (XEXP (addr
, 1)))
638 /* Scaled index with scale = 1 and disp. = 0 */
639 retval
= CRX_SCALED_INDX
;
640 base
= XEXP (addr
, 1);
641 index
= XEXP (addr
, 0);
644 else if (RTX_SIGNED_INT_FITS_N_BITS (XEXP (addr
, 1), 28))
646 /* Register relative address and <= 28-bit disp. */
647 retval
= CRX_REG_REL
;
648 base
= XEXP (addr
, 0);
649 disp
= XEXP (addr
, 1);
656 /* Scaled index and <= 22-bit disp. */
657 retval
= CRX_SCALED_INDX
;
658 base
= XEXP (XEXP (addr
, 0), 1);
659 disp
= XEXP (addr
, 1);
660 if (!RTX_SIGNED_INT_FITS_N_BITS (disp
, 22))
662 switch (GET_CODE (XEXP (XEXP (addr
, 0), 0)))
665 /* Scaled index with scale = 0 and <= 22-bit disp. */
666 index
= XEXP (XEXP (addr
, 0), 0);
671 /* Scaled index with scale >= 0 and <= 22-bit disp. */
672 index
= XEXP (XEXP (XEXP (addr
, 0), 0), 0);
673 scale_rtx
= XEXP (XEXP (XEXP (addr
, 0), 0), 1);
674 if ((scale
= SCALE_FOR_INDEX_P (scale_rtx
)) == -1)
684 /* Scaled index with scale >= 0 */
685 retval
= CRX_SCALED_INDX
;
686 base
= XEXP (addr
, 1);
687 index
= XEXP (XEXP (addr
, 0), 0);
688 scale_rtx
= XEXP (XEXP (addr
, 0), 1);
689 /* Scaled index with scale >= 0 and <= 22-bit disp. */
690 if ((scale
= SCALE_FOR_INDEX_P (scale_rtx
)) == -1)
701 /* Simple post-increment */
702 retval
= CRX_POST_INC
;
703 base
= XEXP (addr
, 0);
708 /* Generic post-increment with <= 12-bit disp. */
709 retval
= CRX_POST_INC
;
710 base
= XEXP (addr
, 0);
711 side_effect
= XEXP (addr
, 1);
712 if (base
!= XEXP (side_effect
, 0))
714 switch (GET_CODE (side_effect
))
718 disp
= XEXP (side_effect
, 1);
719 if (!RTX_SIGNED_INT_FITS_N_BITS (disp
, 12))
724 /* CRX only supports PLUS and MINUS */
733 if (base
&& !crx_addr_reg_p (base
)) return CRX_INVALID
;
734 if (index
&& !crx_addr_reg_p (index
)) return CRX_INVALID
;
740 out
->side_effect
= side_effect
;
746 crx_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED
,
747 rtx addr
, bool strict
)
749 enum crx_addrtype addrtype
;
750 struct crx_address address
;
752 if (TARGET_DEBUG_ADDR
)
755 "\n======\nGO_IF_LEGITIMATE_ADDRESS, mode = %s, strict = %d\n",
756 GET_MODE_NAME (mode
), strict
);
760 addrtype
= crx_decompose_address (addr
, &address
);
762 if (addrtype
== CRX_POST_INC
&& GET_MODE_SIZE (mode
) > UNITS_PER_WORD
)
765 if (TARGET_DEBUG_ADDR
)
774 typestr
= "Register relative";
777 typestr
= "Post-increment";
779 case CRX_SCALED_INDX
:
780 typestr
= "Scaled index";
783 typestr
= "Absolute";
788 fprintf (stderr
, "CRX Address type: %s\n", typestr
);
791 if (addrtype
== CRX_INVALID
)
796 if (address
.base
&& !REGNO_OK_FOR_BASE_P (REGNO (address
.base
)))
798 if (TARGET_DEBUG_ADDR
)
799 fprintf (stderr
, "Base register not strict\n");
802 if (address
.index
&& !REGNO_OK_FOR_INDEX_P (REGNO (address
.index
)))
804 if (TARGET_DEBUG_ADDR
)
805 fprintf (stderr
, "Index register not strict\n");
813 /* ROUTINES TO COMPUTE COSTS */
814 /* ------------------------- */
816 /* Return cost of the memory address x. */
819 crx_address_cost (rtx addr
, bool speed ATTRIBUTE_UNUSED
)
821 enum crx_addrtype addrtype
;
822 struct crx_address address
;
826 addrtype
= crx_decompose_address (addr
, &address
);
828 gcc_assert (addrtype
!= CRX_INVALID
);
830 /* An absolute address causes a 3-word instruction */
831 if (addrtype
== CRX_ABSOLUTE
)
834 /* Post-modifying addresses are more powerful. */
835 if (addrtype
== CRX_POST_INC
)
838 /* Attempt to minimize number of registers in the address. */
842 if (address
.index
&& address
.scale
== 1)
845 if (address
.disp
&& !INT_CST4 (INTVAL (address
.disp
)))
848 if (TARGET_DEBUG_ADDR
)
850 fprintf (stderr
, "\n======\nTARGET_ADDRESS_COST = %d\n", cost
);
857 /* Return the cost of moving data of mode MODE between a register of class
858 * RCLASS and memory; IN is zero if the value is to be written to memory,
859 * nonzero if it is to be read in. This cost is relative to those in
860 * REGISTER_MOVE_COST. */
863 crx_memory_move_cost (enum machine_mode mode
,
864 enum reg_class rclass ATTRIBUTE_UNUSED
,
865 int in ATTRIBUTE_UNUSED
)
867 /* One LD or ST takes twice the time of a simple reg-reg move */
868 if (reg_classes_intersect_p (rclass
, GENERAL_REGS
))
870 /* printf ("GENERAL_REGS LD/ST = %d\n", 4 * HARD_REGNO_NREGS (0, mode));*/
871 return 4 * HARD_REGNO_NREGS (0, mode
);
873 else if (reg_classes_intersect_p (rclass
, HILO_REGS
))
875 /* HILO to memory and vice versa */
876 /* printf ("HILO_REGS %s = %d\n", in ? "LD" : "ST",
877 (REGISTER_MOVE_COST (mode,
878 in ? GENERAL_REGS : HILO_REGS,
879 in ? HILO_REGS : GENERAL_REGS) + 4)
880 * HARD_REGNO_NREGS (0, mode)); */
881 return (REGISTER_MOVE_COST (mode
,
882 in
? GENERAL_REGS
: HILO_REGS
,
883 in
? HILO_REGS
: GENERAL_REGS
) + 4)
884 * HARD_REGNO_NREGS (0, mode
);
886 else /* default (like in i386) */
888 /* printf ("ANYREGS = 100\n"); */
893 /* INSTRUCTION OUTPUT */
894 /* ------------------ */
896 /* Check if a const_double is ok for crx store-immediate instructions */
899 crx_const_double_ok (rtx op
)
901 if (GET_MODE (op
) == DFmode
)
905 REAL_VALUE_FROM_CONST_DOUBLE (r
, op
);
906 REAL_VALUE_TO_TARGET_DOUBLE (r
, l
);
907 return (UNSIGNED_INT_FITS_N_BITS (l
[0], 4) &&
908 UNSIGNED_INT_FITS_N_BITS (l
[1], 4)) ? 1 : 0;
911 if (GET_MODE (op
) == SFmode
)
915 REAL_VALUE_FROM_CONST_DOUBLE (r
, op
);
916 REAL_VALUE_TO_TARGET_SINGLE (r
, l
);
917 return UNSIGNED_INT_FITS_N_BITS (l
, 4) ? 1 : 0;
920 return (UNSIGNED_INT_FITS_N_BITS (CONST_DOUBLE_LOW (op
), 4) &&
921 UNSIGNED_INT_FITS_N_BITS (CONST_DOUBLE_HIGH (op
), 4)) ? 1 : 0;
924 /* Implements the macro PRINT_OPERAND defined in crx.h. */
927 crx_print_operand (FILE * file
, rtx x
, int code
)
932 if (GET_CODE (x
) == REG
) {
933 if (GET_MODE (x
) == DImode
|| GET_MODE (x
) == DFmode
)
935 int regno
= REGNO (x
);
936 if (regno
+ 1 >= SP_REGNUM
) abort ();
937 fprintf (file
, "{%s, %s}", reg_names
[regno
], reg_names
[regno
+ 1]);
942 if (REGNO (x
) >= SP_REGNUM
) abort ();
943 fprintf (file
, "%s", reg_names
[REGNO (x
)]);
950 const char *crx_cmp_str
;
951 switch (GET_CODE (x
))
952 { /* MD: compare (reg, reg or imm) but CRX: cmp (reg or imm, reg)
953 * -> swap all non symmetric ops */
954 case EQ
: crx_cmp_str
= "eq"; break;
955 case NE
: crx_cmp_str
= "ne"; break;
956 case GT
: crx_cmp_str
= "lt"; break;
957 case GTU
: crx_cmp_str
= "lo"; break;
958 case LT
: crx_cmp_str
= "gt"; break;
959 case LTU
: crx_cmp_str
= "hi"; break;
960 case GE
: crx_cmp_str
= "le"; break;
961 case GEU
: crx_cmp_str
= "ls"; break;
962 case LE
: crx_cmp_str
= "ge"; break;
963 case LEU
: crx_cmp_str
= "hs"; break;
966 fprintf (file
, "%s", crx_cmp_str
);
971 /* Print high part of a double precision value. */
972 switch (GET_CODE (x
))
975 if (GET_MODE (x
) == SFmode
) abort ();
976 if (GET_MODE (x
) == DFmode
)
978 /* High part of a DF const. */
982 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
983 REAL_VALUE_TO_TARGET_DOUBLE (r
, l
);
985 fprintf (file
, "$0x%lx", l
[1]);
989 /* -- Fallthrough to handle DI consts -- */
994 split_double (x
, &low
, &high
);
996 output_addr_const (file
, high
);
1001 if (REGNO (x
) + 1 >= FIRST_PSEUDO_REGISTER
) abort ();
1002 fprintf (file
, "%s", reg_names
[REGNO (x
) + 1]);
1006 /* Adjust memory address to high part. */
1009 adj_mem
= adjust_address (adj_mem
, GET_MODE (adj_mem
), 4);
1011 output_memory_reference_mode
= GET_MODE (adj_mem
);
1012 output_address (XEXP (adj_mem
, 0));
1021 /* Print low part of a double precision value. */
1022 switch (GET_CODE (x
))
1025 if (GET_MODE (x
) == SFmode
) abort ();
1026 if (GET_MODE (x
) == DFmode
)
1028 /* High part of a DF const. */
1032 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
1033 REAL_VALUE_TO_TARGET_DOUBLE (r
, l
);
1035 fprintf (file
, "$0x%lx", l
[0]);
1039 /* -- Fallthrough to handle DI consts -- */
1044 split_double (x
, &low
, &high
);
1046 output_addr_const (file
, low
);
1051 fprintf (file
, "%s", reg_names
[REGNO (x
)]);
1055 output_memory_reference_mode
= GET_MODE (x
);
1056 output_address (XEXP (x
, 0));
1063 case 0 : /* default */
1064 switch (GET_CODE (x
))
1067 fprintf (file
, "%s", reg_names
[REGNO (x
)]);
1071 output_memory_reference_mode
= GET_MODE (x
);
1072 output_address (XEXP (x
, 0));
1080 /* Always use H and L for double precision - see above */
1081 gcc_assert (GET_MODE (x
) == SFmode
);
1083 REAL_VALUE_FROM_CONST_DOUBLE (r
, x
);
1084 REAL_VALUE_TO_TARGET_SINGLE (r
, l
);
1086 fprintf (file
, "$0x%lx", l
);
1092 output_addr_const (file
, x
);
1097 output_operand_lossage ("invalid %%xn code");
1103 /* Implements the macro PRINT_OPERAND_ADDRESS defined in crx.h. */
1106 crx_print_operand_address (FILE * file
, rtx addr
)
1108 enum crx_addrtype addrtype
;
1109 struct crx_address address
;
1113 addrtype
= crx_decompose_address (addr
, &address
);
1116 offset
= INTVAL (address
.disp
);
1123 fprintf (file
, "%d(%s)", offset
, reg_names
[REGNO (address
.base
)]);
1127 switch (GET_CODE (address
.side_effect
))
1135 offset
= GET_MODE_SIZE (output_memory_reference_mode
);
1138 offset
= -GET_MODE_SIZE (output_memory_reference_mode
);
1143 fprintf (file
, "%d(%s)+", offset
, reg_names
[REGNO (address
.base
)]);
1146 case CRX_SCALED_INDX
:
1147 fprintf (file
, "%d(%s, %s, %d)", offset
, reg_names
[REGNO (address
.base
)],
1148 reg_names
[REGNO (address
.index
)], address
.scale
);
1152 output_addr_const (file
, address
.disp
);
1161 /*****************************************************************************/
1162 /* MACHINE DESCRIPTION HELPER-FUNCTIONS */
1163 /*****************************************************************************/
1165 void crx_expand_movmem_single (rtx src
, rtx srcbase
, rtx dst
, rtx dstbase
,
1166 rtx tmp_reg
, unsigned HOST_WIDE_INT
*offset_p
)
1169 unsigned HOST_WIDE_INT offset
= *offset_p
;
1172 addr
= plus_constant (src
, offset
);
1173 mem
= adjust_automodify_address (srcbase
, SImode
, addr
, offset
);
1174 emit_move_insn (tmp_reg
, mem
);
1177 addr
= plus_constant (dst
, offset
);
1178 mem
= adjust_automodify_address (dstbase
, SImode
, addr
, offset
);
1179 emit_move_insn (mem
, tmp_reg
);
1181 *offset_p
= offset
+ 4;
1185 crx_expand_movmem (rtx dstbase
, rtx srcbase
, rtx count_exp
, rtx align_exp
)
1187 unsigned HOST_WIDE_INT count
= 0, offset
, si_moves
, i
;
1188 HOST_WIDE_INT align
= 0;
1193 if (GET_CODE (align_exp
) == CONST_INT
)
1194 { /* Only if aligned */
1195 align
= INTVAL (align_exp
);
1200 if (GET_CODE (count_exp
) == CONST_INT
)
1201 { /* No more than 16 SImode moves */
1202 count
= INTVAL (count_exp
);
1207 tmp_reg
= gen_reg_rtx (SImode
);
1209 /* Create psrs for the src and dest pointers */
1210 dst
= copy_to_mode_reg (Pmode
, XEXP (dstbase
, 0));
1211 if (dst
!= XEXP (dstbase
, 0))
1212 dstbase
= replace_equiv_address_nv (dstbase
, dst
);
1213 src
= copy_to_mode_reg (Pmode
, XEXP (srcbase
, 0));
1214 if (src
!= XEXP (srcbase
, 0))
1215 srcbase
= replace_equiv_address_nv (srcbase
, src
);
1219 /* Emit SImode moves */
1220 si_moves
= count
>> 2;
1221 for (i
= 0; i
< si_moves
; i
++)
1222 crx_expand_movmem_single (src
, srcbase
, dst
, dstbase
, tmp_reg
, &offset
);
1228 crx_expand_movmem_single (src
, srcbase
, dst
, dstbase
, tmp_reg
, &offset
);
1231 gcc_assert (offset
== count
);
1237 mpushpop_str (char *stringbuffer
, const char *mnemonic
, char *mask
)
1239 if (strlen (mask
) > 2 || crx_interrupt_function_p ()) /* needs 2-word instr. */
1240 sprintf (stringbuffer
, "\n\t%s\tsp, {%s}", mnemonic
, mask
);
1241 else /* single word instruction */
1242 sprintf (stringbuffer
, "\n\t%s\t%s", mnemonic
, mask
);
1245 /* Called from crx.md. The return value depends on the parameter push_or_pop:
1246 * When push_or_pop is zero -> string for push instructions of prologue.
1247 * When push_or_pop is nonzero -> string for pop/popret/retx in epilogue.
1248 * Relies on the assumptions:
1249 * 1. RA is the last register to be saved.
1250 * 2. The maximal value of the counter is MAX_COUNT. */
1253 crx_prepare_push_pop_string (int push_or_pop
)
1255 /* j is the number of registers being saved, takes care that there won't be
1256 * more than 8 in one push/pop instruction */
1258 /* For the register mask string */
1259 static char mask_str
[50];
1261 /* i is the index of save_regs[], going from 0 until last_reg_to_save */
1264 int ra_in_bitmask
= 0;
1268 /* For reversing on the push instructions if there are more than one. */
1271 return_str
= (char *) xmalloc (120);
1272 temp_str
= (char *) xmalloc (120);
1275 memset (return_str
, 0, 3);
1277 while (i
<= last_reg_to_save
)
1279 /* Prepare mask for one instruction. */
1283 { /* Add regs unit full or SP register reached */
1285 while (j
< MAX_COUNT
&& i
<= SP_REGNUM
)
1289 /* TODO to use ra_in_bitmask for detecting last pop is not
1290 * smart it prevents things like: popret r5 */
1291 if (i
== RETURN_ADDRESS_REGNUM
) ra_in_bitmask
= 1;
1292 if (j
> 0) strcat (mask_str
, ", ");
1293 strcat (mask_str
, reg_names
[i
]);
1301 /* Handle hi/lo savings */
1302 while (i
<= last_reg_to_save
)
1306 strcat (mask_str
, "lo, hi");
1307 i
= last_reg_to_save
+ 1;
1314 if (strlen (mask_str
) == 0) continue;
1316 if (push_or_pop
== 1)
1318 if (crx_interrupt_function_p ())
1319 mpushpop_str (temp_str
, "popx", mask_str
);
1324 mpushpop_str (temp_str
, "popret", mask_str
);
1327 else mpushpop_str (temp_str
, "pop", mask_str
);
1330 strcat (return_str
, temp_str
);
1334 /* push - We need to reverse the order of the instructions if there
1335 * are more than one. (since the pop will not be reversed in the
1337 if (crx_interrupt_function_p ())
1338 mpushpop_str (temp_str
, "pushx", mask_str
);
1340 mpushpop_str (temp_str
, "push", mask_str
);
1341 strcat (temp_str
, return_str
);
1342 strcpy (strcat (return_str
, "\t"), temp_str
);
1347 if (push_or_pop
== 1)
1350 if (crx_interrupt_function_p ())
1351 strcat (return_str
, "\n\tretx\n");
1353 else if (!FUNC_IS_NORETURN_P (current_function_decl
)
1354 && !save_regs
[RETURN_ADDRESS_REGNUM
])
1355 strcat (return_str
, "\n\tjump\tra\n");
1358 /* Skip the newline and the tab in the start of return_str. */
1363 /* CompactRISC CRX Architecture stack layout:
1365 0 +---------------------
1370 +==================== Sp(x)=Ap(x+1)
1371 A | Args for functions
1372 | | called by X and Dynamically
1373 | | Dynamic allocations allocated and
1374 | | (alloca, variable deallocated
1375 Stack | length arrays).
1376 grows +-------------------- Fp(x)
1377 down| | Local variables of X
1378 ward| +--------------------
1379 | | Regs saved for X-1
1380 | +==================== Sp(x-1)=Ap(x)
1383 +-------------------- Fp(x-1)
1391 crx_expand_prologue (void)
1393 crx_compute_frame ();
1394 crx_compute_save_regs ();
1396 /* If there is no need in push and adjustment to sp, return. */
1397 if (size_for_adjusting_sp
+ sum_regs
== 0)
1400 if (last_reg_to_save
!= -1)
1401 /* If there are registers to push. */
1402 emit_insn (gen_push_for_prologue (GEN_INT (sum_regs
)));
1404 if (size_for_adjusting_sp
> 0)
1405 emit_insn (gen_addsi3 (stack_pointer_rtx
, stack_pointer_rtx
,
1406 GEN_INT (-size_for_adjusting_sp
)));
1408 if (frame_pointer_needed
)
1409 /* Initialize the frame pointer with the value of the stack pointer
1410 * pointing now to the locals. */
1411 emit_move_insn (frame_pointer_rtx
, stack_pointer_rtx
);
1414 /* Generate insn that updates the stack for local variables and padding for
1415 * registers we save. - Generate the appropriate return insn. */
1418 crx_expand_epilogue (void)
1422 /* Nonzero if we need to return and pop only RA. This will generate a
1423 * different insn. This differentiate is for the peepholes for call as last
1424 * statement in function. */
1425 int only_popret_RA
= (save_regs
[RETURN_ADDRESS_REGNUM
]
1426 && (sum_regs
== UNITS_PER_WORD
));
1428 /* Return register. */
1429 return_reg
= gen_rtx_REG (Pmode
, RETURN_ADDRESS_REGNUM
);
1431 if (frame_pointer_needed
)
1432 /* Restore the stack pointer with the frame pointers value */
1433 emit_move_insn (stack_pointer_rtx
, frame_pointer_rtx
);
1435 if (size_for_adjusting_sp
> 0)
1436 emit_insn (gen_addsi3 (stack_pointer_rtx
, stack_pointer_rtx
,
1437 GEN_INT (size_for_adjusting_sp
)));
1439 if (crx_interrupt_function_p ())
1440 emit_jump_insn (gen_interrupt_return ());
1441 else if (last_reg_to_save
== -1)
1442 /* Nothing to pop */
1443 /* Don't output jump for interrupt routine, only retx. */
1444 emit_jump_insn (gen_indirect_jump_return ());
1445 else if (only_popret_RA
)
1446 emit_jump_insn (gen_popret_RA_return ());
1448 emit_jump_insn (gen_pop_and_popret_return (GEN_INT (sum_regs
)));
1451 /* Implement TARGET_OPTION_OPTIMIZATION. */
1453 crx_option_optimization (int level
, int size
)
1455 /* Put each function in its own section so that PAGE-instruction
1456 relaxation can do its best. */
1458 flag_function_sections
= 1;