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
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);
134 /*****************************************************************************/
136 /*****************************************************************************/
138 #undef TARGET_LEGITIMATE_ADDRESS_P
139 #define TARGET_LEGITIMATE_ADDRESS_P crx_legitimate_address_p
141 #undef TARGET_CAN_ELIMINATE
142 #define TARGET_CAN_ELIMINATE crx_can_eliminate
144 /*****************************************************************************/
145 /* STACK LAYOUT AND CALLING CONVENTIONS */
146 /*****************************************************************************/
148 #undef TARGET_FIXED_CONDITION_CODE_REGS
149 #define TARGET_FIXED_CONDITION_CODE_REGS crx_fixed_condition_code_regs
151 #undef TARGET_STRUCT_VALUE_RTX
152 #define TARGET_STRUCT_VALUE_RTX crx_struct_value_rtx
154 #undef TARGET_RETURN_IN_MEMORY
155 #define TARGET_RETURN_IN_MEMORY crx_return_in_memory
157 /*****************************************************************************/
158 /* RELATIVE COSTS OF OPERATIONS */
159 /*****************************************************************************/
161 #undef TARGET_ADDRESS_COST
162 #define TARGET_ADDRESS_COST crx_address_cost
164 /*****************************************************************************/
165 /* TARGET-SPECIFIC USES OF `__attribute__' */
166 /*****************************************************************************/
168 #undef TARGET_ATTRIBUTE_TABLE
169 #define TARGET_ATTRIBUTE_TABLE crx_attribute_table
171 static const struct attribute_spec crx_attribute_table[] = {
172 /* ISRs have special prologue and epilogue requirements. */
173 {"interrupt", 0, 0, false, true, true, NULL},
174 {NULL, 0, 0, false, false, false, NULL}
178 /* Initialize 'targetm' variable which contains pointers to functions and data
179 * relating to the target machine. */
181 struct gcc_target targetm = TARGET_INITIALIZER;
184 /*****************************************************************************/
185 /* TARGET HOOK IMPLEMENTATIONS */
186 /*****************************************************************************/
188 /* Return the fixed registers used for condition codes. */
191 crx_fixed_condition_code_regs (unsigned int *p1, unsigned int *p2)
194 *p2 = INVALID_REGNUM;
198 /* Implements hook TARGET_STRUCT_VALUE_RTX. */
201 crx_struct_value_rtx (tree fntype ATTRIBUTE_UNUSED,
202 int incoming ATTRIBUTE_UNUSED)
204 return gen_rtx_REG (Pmode, CRX_STRUCT_VALUE_REGNUM);
207 /* Implements hook TARGET_RETURN_IN_MEMORY. */
210 crx_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED)
212 if (TYPE_MODE (type) == BLKmode)
214 HOST_WIDE_INT size = int_size_in_bytes (type);
215 return (size == -1 || size > 8);
222 /*****************************************************************************/
223 /* MACRO IMPLEMENTATIONS */
224 /*****************************************************************************/
226 /* STACK LAYOUT AND CALLING CONVENTIONS ROUTINES */
227 /* --------------------------------------------- */
229 /* Return nonzero if the current function being compiled is an interrupt
230 * function as specified by the "interrupt" attribute. */
233 crx_interrupt_function_p (void)
237 attributes = TYPE_ATTRIBUTES (TREE_TYPE (current_function_decl));
238 return lookup_attribute ("interrupt", attributes) != NULL_TREE;
241 /* Compute values for the array save_regs and the variable sum_regs. The index
242 * of save_regs is numbers of register, each will get 1 if we need to save it
243 * in the current function, 0 if not. sum_regs is the total sum of the
244 * registers being saved. */
247 crx_compute_save_regs (void)
251 /* initialize here so in case the function is no-return it will be -1. */
252 last_reg_to_save = -1;
254 /* No need to save any registers if the function never returns. */
255 if (FUNC_IS_NORETURN_P (current_function_decl))
258 /* Initialize the number of bytes to be saved. */
261 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
263 if (fixed_regs[regno])
265 save_regs[regno] = 0;
269 /* If this reg is used and not call-used (except RA), save it. */
270 if (crx_interrupt_function_p ())
272 if (!current_function_is_leaf && call_used_regs[regno])
273 /* this is a volatile reg in a non-leaf interrupt routine - save it
274 * for the sake of its sons. */
275 save_regs[regno] = 1;
277 else if (df_regs_ever_live_p (regno))
278 /* This reg is used - save it. */
279 save_regs[regno] = 1;
281 /* This reg is not used, and is not a volatile - don't save. */
282 save_regs[regno] = 0;
286 /* If this reg is used and not call-used (except RA), save it. */
287 if (df_regs_ever_live_p (regno)
288 && (!call_used_regs[regno] || regno == RETURN_ADDRESS_REGNUM))
289 save_regs[regno] = 1;
291 save_regs[regno] = 0;
295 for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
296 if (save_regs[regno] == 1)
298 last_reg_to_save = regno;
299 sum_regs += UNITS_PER_WORD;
303 /* Compute the size of the local area and the size to be adjusted by the
304 * prologue and epilogue. */
307 crx_compute_frame (void)
309 /* For aligning the local variables. */
310 int stack_alignment = STACK_BOUNDARY / BITS_PER_UNIT;
313 /* Padding needed for each element of the frame. */
314 local_vars_size = get_frame_size ();
316 /* Align to the stack alignment. */
317 padding_locals = local_vars_size % stack_alignment;
319 padding_locals = stack_alignment - padding_locals;
321 local_vars_size += padding_locals;
323 size_for_adjusting_sp = local_vars_size + (ACCUMULATE_OUTGOING_ARGS ?
324 crtl->outgoing_args_size : 0);
327 /* Worker function for TARGET_CAN_ELIMINATE. */
330 crx_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to)
332 return (to == STACK_POINTER_REGNUM ? ! frame_pointer_needed : true);
335 /* Implements the macro INITIAL_ELIMINATION_OFFSET, return the OFFSET. */
338 crx_initial_elimination_offset (int from, int to)
340 /* Compute this since we need to use sum_regs. */
341 crx_compute_save_regs ();
343 /* Compute this since we need to use local_vars_size. */
344 crx_compute_frame ();
346 if ((from) == FRAME_POINTER_REGNUM && (to) == STACK_POINTER_REGNUM)
347 return (ACCUMULATE_OUTGOING_ARGS ?
348 crtl->outgoing_args_size : 0);
349 else if ((from) == ARG_POINTER_REGNUM && (to) == FRAME_POINTER_REGNUM)
350 return (sum_regs + local_vars_size);
351 else if ((from) == ARG_POINTER_REGNUM && (to) == STACK_POINTER_REGNUM)
352 return (sum_regs + local_vars_size +
353 (ACCUMULATE_OUTGOING_ARGS ?
354 crtl->outgoing_args_size : 0));
362 /* Return the class number of the smallest class containing reg number REGNO.
363 * This could be a conditional expression or could index an array. */
366 crx_regno_reg_class (int regno)
368 if (regno >= 0 && regno < SP_REGNUM)
371 if (regno == SP_REGNUM)
374 if (regno == LO_REGNUM)
376 if (regno == HI_REGNUM)
382 /* Transfer between HILO_REGS and memory via secondary reloading. */
385 crx_secondary_reload_class (enum reg_class rclass,
386 enum machine_mode mode ATTRIBUTE_UNUSED,
387 rtx x ATTRIBUTE_UNUSED)
389 if (reg_classes_intersect_p (rclass, HILO_REGS)
390 && true_regnum (x) == -1)
396 /* Return 1 if hard register REGNO can hold a value of machine-mode MODE. */
399 crx_hard_regno_mode_ok (int regno, enum machine_mode mode)
401 /* CC can only hold CCmode values. */
402 if (regno == CC_REGNUM)
403 return GET_MODE_CLASS (mode) == MODE_CC;
404 if (GET_MODE_CLASS (mode) == MODE_CC)
406 /* HILO registers can only hold SImode and DImode */
407 if (HILO_REGNO_P (regno))
408 return mode == SImode || mode == DImode;
412 /* PASSING FUNCTION ARGUMENTS */
413 /* -------------------------- */
415 /* If enough param regs are available for passing the param of type TYPE return
416 * the number of registers needed else 0. */
419 enough_regs_for_param (CUMULATIVE_ARGS * cum, tree type,
420 enum machine_mode mode)
426 type_size = GET_MODE_BITSIZE (mode);
428 type_size = int_size_in_bytes (type) * BITS_PER_UNIT;
431 BITS_PER_WORD * (MAX_REG_FOR_PASSING_ARGS -
432 (MIN_REG_FOR_PASSING_ARGS + cum->ints) + 1);
434 /* Any variable which is too big to pass in two registers, will pass on
436 if ((remaining_size >= type_size) && (type_size <= 2 * BITS_PER_WORD))
437 return (type_size + BITS_PER_WORD - 1) / BITS_PER_WORD;
442 /* Implements the macro FUNCTION_ARG defined in crx.h. */
445 crx_function_arg (CUMULATIVE_ARGS * cum, enum machine_mode mode, tree type,
446 int named ATTRIBUTE_UNUSED)
448 last_parm_in_reg = 0;
450 /* Function_arg () is called with this type just after all the args have had
451 * their registers assigned. The rtx that function_arg returns from this type
452 * is supposed to pass to 'gen_call' but currently it is not implemented (see
453 * macro GEN_CALL). */
454 if (type == void_type_node)
457 if (targetm.calls.must_pass_in_stack (mode, type) || (cum->ints < 0))
462 /* Enable structures that need padding bytes at the end to pass to a
463 * function in registers. */
464 if (enough_regs_for_param (cum, type, mode) != 0)
466 last_parm_in_reg = 1;
467 return gen_rtx_REG (mode, MIN_REG_FOR_PASSING_ARGS + cum->ints);
471 if (MIN_REG_FOR_PASSING_ARGS + cum->ints > MAX_REG_FOR_PASSING_ARGS)
475 if (enough_regs_for_param (cum, type, mode) != 0)
477 last_parm_in_reg = 1;
478 return gen_rtx_REG (mode, MIN_REG_FOR_PASSING_ARGS + cum->ints);
485 /* Implements the macro INIT_CUMULATIVE_ARGS defined in crx.h. */
488 crx_init_cumulative_args (CUMULATIVE_ARGS * cum, tree fntype,
489 rtx libfunc ATTRIBUTE_UNUSED)
491 tree param, next_param;
495 /* Determine if this function has variable arguments. This is indicated by
496 * the last argument being 'void_type_mode' if there are no variable
497 * arguments. Change here for a different vararg. */
498 for (param = (fntype) ? TYPE_ARG_TYPES (fntype) : 0;
499 param != (tree) 0; param = next_param)
501 next_param = TREE_CHAIN (param);
502 if (next_param == (tree) 0 && TREE_VALUE (param) != void_type_node)
510 /* Implements the macro FUNCTION_ARG_ADVANCE defined in crx.h. */
513 crx_function_arg_advance (CUMULATIVE_ARGS * cum, enum machine_mode mode,
514 tree type, int named ATTRIBUTE_UNUSED)
516 /* l holds the number of registers required */
517 int l = GET_MODE_BITSIZE (mode) / BITS_PER_WORD;
519 /* If the parameter isn't passed on a register don't advance cum. */
520 if (!last_parm_in_reg)
523 if (targetm.calls.must_pass_in_stack (mode, type) || (cum->ints < 0))
526 if (mode == SImode || mode == HImode || mode == QImode || mode == DImode)
533 else if (mode == SFmode || mode == DFmode)
535 else if ((mode) == BLKmode)
537 if ((l = enough_regs_for_param (cum, type, mode)) != 0)
543 /* Implements the macro FUNCTION_ARG_REGNO_P defined in crx.h. Return nonzero
544 * if N is a register used for passing parameters. */
547 crx_function_arg_regno_p (int n)
549 return (n <= MAX_REG_FOR_PASSING_ARGS && n >= MIN_REG_FOR_PASSING_ARGS);
552 /* ADDRESSING MODES */
553 /* ---------------- */
555 /* Implements the hook for TARGET_LEGITIMATE_ADDRESS_P defined in crx.h.
556 * The following addressing modes are supported on CRX:
558 * Relocations --> const | symbol_ref | label_ref
559 * Absolute address --> 32-bit absolute
560 * Post increment --> reg + 12-bit disp.
561 * Post modify --> reg + 12-bit disp.
562 * Register relative --> reg | 32-bit disp. + reg | 4 bit + reg
563 * Scaled index --> reg + reg | 22-bit disp. + reg + reg |
564 * 22-disp. + reg + reg + (2 | 4 | 8) */
566 static int crx_addr_reg_p (rtx addr_reg)
570 if (REG_P (addr_reg))
574 else if ((GET_CODE (addr_reg) == SUBREG
575 && REG_P (SUBREG_REG (addr_reg))
576 && GET_MODE_SIZE (GET_MODE (SUBREG_REG (addr_reg)))
579 reg = SUBREG_REG (addr_reg);
584 if (GET_MODE (addr_reg) != Pmode)
593 crx_decompose_address (rtx addr, struct crx_address *out)
595 rtx base = NULL_RTX, index = NULL_RTX, disp = NULL_RTX;
596 rtx scale_rtx = NULL_RTX, side_effect = NULL_RTX;
599 enum crx_addrtype retval = CRX_INVALID;
601 switch (GET_CODE (addr))
604 /* Absolute address (known at compile time) */
605 retval = CRX_ABSOLUTE;
607 if (!UNSIGNED_INT_FITS_N_BITS (INTVAL (disp), GET_MODE_BITSIZE (Pmode)))
614 /* Absolute address (known at link time) */
615 retval = CRX_ABSOLUTE;
621 /* Register relative address */
622 retval = CRX_REG_REL;
627 switch (GET_CODE (XEXP (addr, 0)))
631 if (REG_P (XEXP (addr, 1)))
633 /* Scaled index with scale = 1 and disp. = 0 */
634 retval = CRX_SCALED_INDX;
635 base = XEXP (addr, 1);
636 index = XEXP (addr, 0);
639 else if (RTX_SIGNED_INT_FITS_N_BITS (XEXP (addr, 1), 28))
641 /* Register relative address and <= 28-bit disp. */
642 retval = CRX_REG_REL;
643 base = XEXP (addr, 0);
644 disp = XEXP (addr, 1);
651 /* Scaled index and <= 22-bit disp. */
652 retval = CRX_SCALED_INDX;
653 base = XEXP (XEXP (addr, 0), 1);
654 disp = XEXP (addr, 1);
655 if (!RTX_SIGNED_INT_FITS_N_BITS (disp, 22))
657 switch (GET_CODE (XEXP (XEXP (addr, 0), 0)))
660 /* Scaled index with scale = 0 and <= 22-bit disp. */
661 index = XEXP (XEXP (addr, 0), 0);
666 /* Scaled index with scale >= 0 and <= 22-bit disp. */
667 index = XEXP (XEXP (XEXP (addr, 0), 0), 0);
668 scale_rtx = XEXP (XEXP (XEXP (addr, 0), 0), 1);
669 if ((scale = SCALE_FOR_INDEX_P (scale_rtx)) == -1)
679 /* Scaled index with scale >= 0 */
680 retval = CRX_SCALED_INDX;
681 base = XEXP (addr, 1);
682 index = XEXP (XEXP (addr, 0), 0);
683 scale_rtx = XEXP (XEXP (addr, 0), 1);
684 /* Scaled index with scale >= 0 and <= 22-bit disp. */
685 if ((scale = SCALE_FOR_INDEX_P (scale_rtx)) == -1)
696 /* Simple post-increment */
697 retval = CRX_POST_INC;
698 base = XEXP (addr, 0);
703 /* Generic post-increment with <= 12-bit disp. */
704 retval = CRX_POST_INC;
705 base = XEXP (addr, 0);
706 side_effect = XEXP (addr, 1);
707 if (base != XEXP (side_effect, 0))
709 switch (GET_CODE (side_effect))
713 disp = XEXP (side_effect, 1);
714 if (!RTX_SIGNED_INT_FITS_N_BITS (disp, 12))
719 /* CRX only supports PLUS and MINUS */
728 if (base && !crx_addr_reg_p (base)) return CRX_INVALID;
729 if (index && !crx_addr_reg_p (index)) return CRX_INVALID;
735 out->side_effect = side_effect;
741 crx_legitimate_address_p (enum machine_mode mode ATTRIBUTE_UNUSED,
742 rtx addr, bool strict)
744 enum crx_addrtype addrtype;
745 struct crx_address address;
747 if (TARGET_DEBUG_ADDR)
750 "\n======\nGO_IF_LEGITIMATE_ADDRESS, mode = %s, strict = %d\n",
751 GET_MODE_NAME (mode), strict);
755 addrtype = crx_decompose_address (addr, &address);
757 if (addrtype == CRX_POST_INC && GET_MODE_SIZE (mode) > UNITS_PER_WORD)
760 if (TARGET_DEBUG_ADDR)
769 typestr = "Register relative";
772 typestr = "Post-increment";
774 case CRX_SCALED_INDX:
775 typestr = "Scaled index";
778 typestr = "Absolute";
783 fprintf (stderr, "CRX Address type: %s\n", typestr);
786 if (addrtype == CRX_INVALID)
791 if (address.base && !REGNO_OK_FOR_BASE_P (REGNO (address.base)))
793 if (TARGET_DEBUG_ADDR)
794 fprintf (stderr, "Base register not strict\n");
797 if (address.index && !REGNO_OK_FOR_INDEX_P (REGNO (address.index)))
799 if (TARGET_DEBUG_ADDR)
800 fprintf (stderr, "Index register not strict\n");
808 /* ROUTINES TO COMPUTE COSTS */
809 /* ------------------------- */
811 /* Return cost of the memory address x. */
814 crx_address_cost (rtx addr, bool speed ATTRIBUTE_UNUSED)
816 enum crx_addrtype addrtype;
817 struct crx_address address;
821 addrtype = crx_decompose_address (addr, &address);
823 gcc_assert (addrtype != CRX_INVALID);
825 /* An absolute address causes a 3-word instruction */
826 if (addrtype == CRX_ABSOLUTE)
829 /* Post-modifying addresses are more powerful. */
830 if (addrtype == CRX_POST_INC)
833 /* Attempt to minimize number of registers in the address. */
837 if (address.index && address.scale == 1)
840 if (address.disp && !INT_CST4 (INTVAL (address.disp)))
843 if (TARGET_DEBUG_ADDR)
845 fprintf (stderr, "\n======\nTARGET_ADDRESS_COST = %d\n", cost);
852 /* Return the cost of moving data of mode MODE between a register of class
853 * RCLASS and memory; IN is zero if the value is to be written to memory,
854 * nonzero if it is to be read in. This cost is relative to those in
855 * REGISTER_MOVE_COST. */
858 crx_memory_move_cost (enum machine_mode mode,
859 enum reg_class rclass ATTRIBUTE_UNUSED,
860 int in ATTRIBUTE_UNUSED)
862 /* One LD or ST takes twice the time of a simple reg-reg move */
863 if (reg_classes_intersect_p (rclass, GENERAL_REGS))
865 /* printf ("GENERAL_REGS LD/ST = %d\n", 4 * HARD_REGNO_NREGS (0, mode));*/
866 return 4 * HARD_REGNO_NREGS (0, mode);
868 else if (reg_classes_intersect_p (rclass, HILO_REGS))
870 /* HILO to memory and vice versa */
871 /* printf ("HILO_REGS %s = %d\n", in ? "LD" : "ST",
872 (REGISTER_MOVE_COST (mode,
873 in ? GENERAL_REGS : HILO_REGS,
874 in ? HILO_REGS : GENERAL_REGS) + 4)
875 * HARD_REGNO_NREGS (0, mode)); */
876 return (REGISTER_MOVE_COST (mode,
877 in ? GENERAL_REGS : HILO_REGS,
878 in ? HILO_REGS : GENERAL_REGS) + 4)
879 * HARD_REGNO_NREGS (0, mode);
881 else /* default (like in i386) */
883 /* printf ("ANYREGS = 100\n"); */
888 /* INSTRUCTION OUTPUT */
889 /* ------------------ */
891 /* Check if a const_double is ok for crx store-immediate instructions */
894 crx_const_double_ok (rtx op)
896 if (GET_MODE (op) == DFmode)
900 REAL_VALUE_FROM_CONST_DOUBLE (r, op);
901 REAL_VALUE_TO_TARGET_DOUBLE (r, l);
902 return (UNSIGNED_INT_FITS_N_BITS (l[0], 4) &&
903 UNSIGNED_INT_FITS_N_BITS (l[1], 4)) ? 1 : 0;
906 if (GET_MODE (op) == SFmode)
910 REAL_VALUE_FROM_CONST_DOUBLE (r, op);
911 REAL_VALUE_TO_TARGET_SINGLE (r, l);
912 return UNSIGNED_INT_FITS_N_BITS (l, 4) ? 1 : 0;
915 return (UNSIGNED_INT_FITS_N_BITS (CONST_DOUBLE_LOW (op), 4) &&
916 UNSIGNED_INT_FITS_N_BITS (CONST_DOUBLE_HIGH (op), 4)) ? 1 : 0;
919 /* Implements the macro PRINT_OPERAND defined in crx.h. */
922 crx_print_operand (FILE * file, rtx x, int code)
927 if (GET_CODE (x) == REG) {
928 if (GET_MODE (x) == DImode || GET_MODE (x) == DFmode)
930 int regno = REGNO (x);
931 if (regno + 1 >= SP_REGNUM) abort ();
932 fprintf (file, "{%s, %s}", reg_names[regno], reg_names[regno + 1]);
937 if (REGNO (x) >= SP_REGNUM) abort ();
938 fprintf (file, "%s", reg_names[REGNO (x)]);
945 const char *crx_cmp_str;
946 switch (GET_CODE (x))
947 { /* MD: compare (reg, reg or imm) but CRX: cmp (reg or imm, reg)
948 * -> swap all non symmetric ops */
949 case EQ : crx_cmp_str = "eq"; break;
950 case NE : crx_cmp_str = "ne"; break;
951 case GT : crx_cmp_str = "lt"; break;
952 case GTU : crx_cmp_str = "lo"; break;
953 case LT : crx_cmp_str = "gt"; break;
954 case LTU : crx_cmp_str = "hi"; break;
955 case GE : crx_cmp_str = "le"; break;
956 case GEU : crx_cmp_str = "ls"; break;
957 case LE : crx_cmp_str = "ge"; break;
958 case LEU : crx_cmp_str = "hs"; break;
961 fprintf (file, "%s", crx_cmp_str);
966 /* Print high part of a double precision value. */
967 switch (GET_CODE (x))
970 if (GET_MODE (x) == SFmode) abort ();
971 if (GET_MODE (x) == DFmode)
973 /* High part of a DF const. */
977 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
978 REAL_VALUE_TO_TARGET_DOUBLE (r, l);
980 fprintf (file, "$0x%lx", l[1]);
984 /* -- Fallthrough to handle DI consts -- */
989 split_double (x, &low, &high);
991 output_addr_const (file, high);
996 if (REGNO (x) + 1 >= FIRST_PSEUDO_REGISTER) abort ();
997 fprintf (file, "%s", reg_names[REGNO (x) + 1]);
1001 /* Adjust memory address to high part. */
1004 adj_mem = adjust_address (adj_mem, GET_MODE (adj_mem), 4);
1006 output_memory_reference_mode = GET_MODE (adj_mem);
1007 output_address (XEXP (adj_mem, 0));
1016 /* Print low part of a double precision value. */
1017 switch (GET_CODE (x))
1020 if (GET_MODE (x) == SFmode) abort ();
1021 if (GET_MODE (x) == DFmode)
1023 /* High part of a DF const. */
1027 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
1028 REAL_VALUE_TO_TARGET_DOUBLE (r, l);
1030 fprintf (file, "$0x%lx", l[0]);
1034 /* -- Fallthrough to handle DI consts -- */
1039 split_double (x, &low, &high);
1041 output_addr_const (file, low);
1046 fprintf (file, "%s", reg_names[REGNO (x)]);
1050 output_memory_reference_mode = GET_MODE (x);
1051 output_address (XEXP (x, 0));
1058 case 0 : /* default */
1059 switch (GET_CODE (x))
1062 fprintf (file, "%s", reg_names[REGNO (x)]);
1066 output_memory_reference_mode = GET_MODE (x);
1067 output_address (XEXP (x, 0));
1075 /* Always use H and L for double precision - see above */
1076 gcc_assert (GET_MODE (x) == SFmode);
1078 REAL_VALUE_FROM_CONST_DOUBLE (r, x);
1079 REAL_VALUE_TO_TARGET_SINGLE (r, l);
1081 fprintf (file, "$0x%lx", l);
1087 output_addr_const (file, x);
1092 output_operand_lossage ("invalid %%xn code");
1098 /* Implements the macro PRINT_OPERAND_ADDRESS defined in crx.h. */
1101 crx_print_operand_address (FILE * file, rtx addr)
1103 enum crx_addrtype addrtype;
1104 struct crx_address address;
1108 addrtype = crx_decompose_address (addr, &address);
1111 offset = INTVAL (address.disp);
1118 fprintf (file, "%d(%s)", offset, reg_names[REGNO (address.base)]);
1122 switch (GET_CODE (address.side_effect))
1130 offset = GET_MODE_SIZE (output_memory_reference_mode);
1133 offset = -GET_MODE_SIZE (output_memory_reference_mode);
1138 fprintf (file, "%d(%s)+", offset, reg_names[REGNO (address.base)]);
1141 case CRX_SCALED_INDX:
1142 fprintf (file, "%d(%s, %s, %d)", offset, reg_names[REGNO (address.base)],
1143 reg_names[REGNO (address.index)], address.scale);
1147 output_addr_const (file, address.disp);
1156 /*****************************************************************************/
1157 /* MACHINE DESCRIPTION HELPER-FUNCTIONS */
1158 /*****************************************************************************/
1160 void crx_expand_movmem_single (rtx src, rtx srcbase, rtx dst, rtx dstbase,
1161 rtx tmp_reg, unsigned HOST_WIDE_INT *offset_p)
1164 unsigned HOST_WIDE_INT offset = *offset_p;
1167 addr = plus_constant (src, offset);
1168 mem = adjust_automodify_address (srcbase, SImode, addr, offset);
1169 emit_move_insn (tmp_reg, mem);
1172 addr = plus_constant (dst, offset);
1173 mem = adjust_automodify_address (dstbase, SImode, addr, offset);
1174 emit_move_insn (mem, tmp_reg);
1176 *offset_p = offset + 4;
1180 crx_expand_movmem (rtx dstbase, rtx srcbase, rtx count_exp, rtx align_exp)
1182 unsigned HOST_WIDE_INT count = 0, offset, si_moves, i;
1183 HOST_WIDE_INT align = 0;
1188 if (GET_CODE (align_exp) == CONST_INT)
1189 { /* Only if aligned */
1190 align = INTVAL (align_exp);
1195 if (GET_CODE (count_exp) == CONST_INT)
1196 { /* No more than 16 SImode moves */
1197 count = INTVAL (count_exp);
1202 tmp_reg = gen_reg_rtx (SImode);
1204 /* Create psrs for the src and dest pointers */
1205 dst = copy_to_mode_reg (Pmode, XEXP (dstbase, 0));
1206 if (dst != XEXP (dstbase, 0))
1207 dstbase = replace_equiv_address_nv (dstbase, dst);
1208 src = copy_to_mode_reg (Pmode, XEXP (srcbase, 0));
1209 if (src != XEXP (srcbase, 0))
1210 srcbase = replace_equiv_address_nv (srcbase, src);
1214 /* Emit SImode moves */
1215 si_moves = count >> 2;
1216 for (i = 0; i < si_moves; i++)
1217 crx_expand_movmem_single (src, srcbase, dst, dstbase, tmp_reg, &offset);
1223 crx_expand_movmem_single (src, srcbase, dst, dstbase, tmp_reg, &offset);
1226 gcc_assert (offset == count);
1232 mpushpop_str (char *stringbuffer, const char *mnemonic, char *mask)
1234 if (strlen (mask) > 2 || crx_interrupt_function_p ()) /* needs 2-word instr. */
1235 sprintf (stringbuffer, "\n\t%s\tsp, {%s}", mnemonic, mask);
1236 else /* single word instruction */
1237 sprintf (stringbuffer, "\n\t%s\t%s", mnemonic, mask);
1240 /* Called from crx.md. The return value depends on the parameter push_or_pop:
1241 * When push_or_pop is zero -> string for push instructions of prologue.
1242 * When push_or_pop is nonzero -> string for pop/popret/retx in epilogue.
1243 * Relies on the assumptions:
1244 * 1. RA is the last register to be saved.
1245 * 2. The maximal value of the counter is MAX_COUNT. */
1248 crx_prepare_push_pop_string (int push_or_pop)
1250 /* j is the number of registers being saved, takes care that there won't be
1251 * more than 8 in one push/pop instruction */
1253 /* For the register mask string */
1254 static char mask_str[50];
1256 /* i is the index of save_regs[], going from 0 until last_reg_to_save */
1259 int ra_in_bitmask = 0;
1263 /* For reversing on the push instructions if there are more than one. */
1266 return_str = (char *) xmalloc (120);
1267 temp_str = (char *) xmalloc (120);
1270 memset (return_str, 0, 3);
1272 while (i <= last_reg_to_save)
1274 /* Prepare mask for one instruction. */
1278 { /* Add regs unit full or SP register reached */
1280 while (j < MAX_COUNT && i <= SP_REGNUM)
1284 /* TODO to use ra_in_bitmask for detecting last pop is not
1285 * smart it prevents things like: popret r5 */
1286 if (i == RETURN_ADDRESS_REGNUM) ra_in_bitmask = 1;
1287 if (j > 0) strcat (mask_str, ", ");
1288 strcat (mask_str, reg_names[i]);
1296 /* Handle hi/lo savings */
1297 while (i <= last_reg_to_save)
1301 strcat (mask_str, "lo, hi");
1302 i = last_reg_to_save + 1;
1309 if (strlen (mask_str) == 0) continue;
1311 if (push_or_pop == 1)
1313 if (crx_interrupt_function_p ())
1314 mpushpop_str (temp_str, "popx", mask_str);
1319 mpushpop_str (temp_str, "popret", mask_str);
1322 else mpushpop_str (temp_str, "pop", mask_str);
1325 strcat (return_str, temp_str);
1329 /* push - We need to reverse the order of the instructions if there
1330 * are more than one. (since the pop will not be reversed in the
1332 if (crx_interrupt_function_p ())
1333 mpushpop_str (temp_str, "pushx", mask_str);
1335 mpushpop_str (temp_str, "push", mask_str);
1336 strcat (temp_str, return_str);
1337 strcpy (strcat (return_str, "\t"), temp_str);
1342 if (push_or_pop == 1)
1345 if (crx_interrupt_function_p ())
1346 strcat (return_str, "\n\tretx\n");
1348 else if (!FUNC_IS_NORETURN_P (current_function_decl)
1349 && !save_regs[RETURN_ADDRESS_REGNUM])
1350 strcat (return_str, "\n\tjump\tra\n");
1353 /* Skip the newline and the tab in the start of return_str. */
1358 /* CompactRISC CRX Architecture stack layout:
1360 0 +---------------------
1365 +==================== Sp(x)=Ap(x+1)
1366 A | Args for functions
1367 | | called by X and Dynamically
1368 | | Dynamic allocations allocated and
1369 | | (alloca, variable deallocated
1370 Stack | length arrays).
1371 grows +-------------------- Fp(x)
1372 down| | Local variables of X
1373 ward| +--------------------
1374 | | Regs saved for X-1
1375 | +==================== Sp(x-1)=Ap(x)
1378 +-------------------- Fp(x-1)
1386 crx_expand_prologue (void)
1388 crx_compute_frame ();
1389 crx_compute_save_regs ();
1391 /* If there is no need in push and adjustment to sp, return. */
1392 if (size_for_adjusting_sp + sum_regs == 0)
1395 if (last_reg_to_save != -1)
1396 /* If there are registers to push. */
1397 emit_insn (gen_push_for_prologue (GEN_INT (sum_regs)));
1399 if (size_for_adjusting_sp > 0)
1400 emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
1401 GEN_INT (-size_for_adjusting_sp)));
1403 if (frame_pointer_needed)
1404 /* Initialize the frame pointer with the value of the stack pointer
1405 * pointing now to the locals. */
1406 emit_move_insn (frame_pointer_rtx, stack_pointer_rtx);
1409 /* Generate insn that updates the stack for local variables and padding for
1410 * registers we save. - Generate the appropriate return insn. */
1413 crx_expand_epilogue (void)
1417 /* Nonzero if we need to return and pop only RA. This will generate a
1418 * different insn. This differentiate is for the peepholes for call as last
1419 * statement in function. */
1420 int only_popret_RA = (save_regs[RETURN_ADDRESS_REGNUM]
1421 && (sum_regs == UNITS_PER_WORD));
1423 /* Return register. */
1424 return_reg = gen_rtx_REG (Pmode, RETURN_ADDRESS_REGNUM);
1426 if (frame_pointer_needed)
1427 /* Restore the stack pointer with the frame pointers value */
1428 emit_move_insn (stack_pointer_rtx, frame_pointer_rtx);
1430 if (size_for_adjusting_sp > 0)
1431 emit_insn (gen_addsi3 (stack_pointer_rtx, stack_pointer_rtx,
1432 GEN_INT (size_for_adjusting_sp)));
1434 if (crx_interrupt_function_p ())
1435 emit_jump_insn (gen_interrupt_return ());
1436 else if (last_reg_to_save == -1)
1437 /* Nothing to pop */
1438 /* Don't output jump for interrupt routine, only retx. */
1439 emit_jump_insn (gen_indirect_jump_return ());
1440 else if (only_popret_RA)
1441 emit_jump_insn (gen_popret_RA_return ());
1443 emit_jump_insn (gen_pop_and_popret_return (GEN_INT (sum_regs)));