1 /* Print SPARC instructions.
2 Copyright (C) 1989, 91-97, 1998 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
22 #include "opcode/sparc.h"
24 #include "libiberty.h"
27 /* Bitmask of v9 architectures. */
28 #define MASK_V9 ((1 << SPARC_OPCODE_ARCH_V9) \
29 | (1 << SPARC_OPCODE_ARCH_V9A))
30 /* 1 if INSN is for v9 only. */
31 #define V9_ONLY_P(insn) (! ((insn)->architecture & ~MASK_V9))
32 /* 1 if INSN is for v9. */
33 #define V9_P(insn) (((insn)->architecture & MASK_V9) != 0)
35 /* The sorted opcode table. */
36 static const struct sparc_opcode **sorted_opcodes;
38 /* For faster lookup, after insns are sorted they are hashed. */
39 /* ??? I think there is room for even more improvement. */
42 /* It is important that we only look at insn code bits as that is how the
43 opcode table is hashed. OPCODE_BITS is a table of valid bits for each
44 of the main types (0,1,2,3). */
45 static int opcode_bits[4] = { 0x01c00000, 0x0, 0x01f80000, 0x01f80000 };
46 #define HASH_INSN(INSN) \
47 ((((INSN) >> 24) & 0xc0) | (((INSN) & opcode_bits[((INSN) >> 30) & 3]) >> 19))
49 struct opcode_hash *next;
50 const struct sparc_opcode *opcode;
52 static struct opcode_hash *opcode_hash_table[HASH_SIZE];
54 static void build_hash_table
55 PARAMS ((const struct sparc_opcode **, struct opcode_hash **, int));
56 static int is_delayed_branch PARAMS ((unsigned long));
57 static int compare_opcodes PARAMS ((const PTR, const PTR));
58 static int compute_arch_mask PARAMS ((unsigned long));
60 /* Sign-extend a value which is N bits long. */
61 #define SEX(value, bits) \
62 ((((int)(value)) << ((8 * sizeof (int)) - bits)) \
63 >> ((8 * sizeof (int)) - bits) )
65 static char *reg_names[] =
66 { "g0", "g1", "g2", "g3", "g4", "g5", "g6", "g7",
67 "o0", "o1", "o2", "o3", "o4", "o5", "sp", "o7",
68 "l0", "l1", "l2", "l3", "l4", "l5", "l6", "l7",
69 "i0", "i1", "i2", "i3", "i4", "i5", "fp", "i7",
70 "f0", "f1", "f2", "f3", "f4", "f5", "f6", "f7",
71 "f8", "f9", "f10", "f11", "f12", "f13", "f14", "f15",
72 "f16", "f17", "f18", "f19", "f20", "f21", "f22", "f23",
73 "f24", "f25", "f26", "f27", "f28", "f29", "f30", "f31",
74 "f32", "f33", "f34", "f35", "f36", "f37", "f38", "f39",
75 "f40", "f41", "f42", "f43", "f44", "f45", "f46", "f47",
76 "f48", "f49", "f50", "f51", "f52", "f53", "f54", "f55",
77 "f56", "f57", "f58", "f59", "f60", "f61", "f62", "f63",
78 /* psr, wim, tbr, fpsr, cpsr are v8 only. */
79 "y", "psr", "wim", "tbr", "pc", "npc", "fpsr", "cpsr"
82 #define freg_names (®_names[4 * 8])
84 /* These are ordered according to there register number in
85 rdpr and wrpr insns. */
86 static char *v9_priv_reg_names[] =
88 "tpc", "tnpc", "tstate", "tt", "tick", "tba", "pstate", "tl",
89 "pil", "cwp", "cansave", "canrestore", "cleanwin", "otherwin",
91 /* "ver" - special cased */
94 /* These are ordered according to there register number in
95 rd and wr insns (-16). */
96 static char *v9a_asr_reg_names[] =
98 "pcr", "pic", "dcr", "gsr", "set_softint", "clear_softint",
99 "softint", "tick_cmpr"
102 /* Macros used to extract instruction fields. Not all fields have
103 macros defined here, only those which are actually used. */
105 #define X_RD(i) (((i) >> 25) & 0x1f)
106 #define X_RS1(i) (((i) >> 14) & 0x1f)
107 #define X_LDST_I(i) (((i) >> 13) & 1)
108 #define X_ASI(i) (((i) >> 5) & 0xff)
109 #define X_RS2(i) (((i) >> 0) & 0x1f)
110 #define X_IMM(i,n) (((i) >> 0) & ((1 << (n)) - 1))
111 #define X_SIMM(i,n) SEX (X_IMM ((i), (n)), (n))
112 #define X_DISP22(i) (((i) >> 0) & 0x3fffff)
113 #define X_IMM22(i) X_DISP22 (i)
114 #define X_DISP30(i) (((i) >> 0) & 0x3fffffff)
116 /* These are for v9. */
117 #define X_DISP16(i) (((((i) >> 20) & 3) << 14) | (((i) >> 0) & 0x3fff))
118 #define X_DISP19(i) (((i) >> 0) & 0x7ffff)
119 #define X_MEMBAR(i) ((i) & 0x7f)
121 /* Here is the union which was used to extract instruction fields
122 before the shift and mask macros were written.
126 unsigned long int code;
134 unsigned int anrs1:5;
135 #define rs1 ldst.anrs1
137 unsigned int anasi:8;
138 #define asi ldst.anasi
139 unsigned int anrs2:5;
140 #define rs2 ldst.anrs2
145 unsigned int anop:2, anrd:5, op3:6, anrs1:5, i:1;
146 unsigned int IMM13:13;
147 #define imm13 IMM13.IMM13
155 unsigned int DISP22:22;
156 #define disp22 branch.DISP22
164 unsigned int rcond:3;
166 unsigned int DISP16HI:2;
169 unsigned int DISP16LO:14;
174 unsigned int adisp30:30;
175 #define disp30 call.adisp30
181 /* Nonzero if INSN is the opcode for a delayed branch. */
183 is_delayed_branch (insn)
186 struct opcode_hash *op;
188 for (op = opcode_hash_table[HASH_INSN (insn)]; op; op = op->next)
190 CONST struct sparc_opcode *opcode = op->opcode;
191 if ((opcode->match & insn) == opcode->match
192 && (opcode->lose & insn) == 0)
193 return (opcode->flags & F_DELAYED);
198 /* extern void qsort (); */
200 /* Records current mask of SPARC_OPCODE_ARCH_FOO values, used to pass value
201 to compare_opcodes. */
202 static unsigned int current_arch_mask;
204 /* Print one instruction from MEMADDR on INFO->STREAM.
206 We suffix the instruction with a comment that gives the absolute
207 address involved, as well as its symbolic form, if the instruction
208 is preceded by a findable `sethi' and it either adds an immediate
209 displacement to that register, or it is an `add' or `or' instruction
213 print_insn_sparc (memaddr, info)
215 disassemble_info *info;
217 FILE *stream = info->stream;
220 register struct opcode_hash *op;
221 /* Nonzero of opcode table has been initialized. */
222 static int opcodes_initialized = 0;
223 /* bfd mach number of last call. */
224 static unsigned long current_mach = 0;
225 bfd_vma (*getword) PARAMS ((const unsigned char *));
227 if (!opcodes_initialized
228 || info->mach != current_mach)
232 current_arch_mask = compute_arch_mask (info->mach);
234 if (!opcodes_initialized)
235 sorted_opcodes = (const struct sparc_opcode **)
236 xmalloc (sparc_num_opcodes * sizeof (struct sparc_opcode *));
237 /* Reset the sorted table so we can resort it. */
238 for (i = 0; i < sparc_num_opcodes; ++i)
239 sorted_opcodes[i] = &sparc_opcodes[i];
240 qsort ((char *) sorted_opcodes, sparc_num_opcodes,
241 sizeof (sorted_opcodes[0]), compare_opcodes);
243 build_hash_table (sorted_opcodes, opcode_hash_table, sparc_num_opcodes);
244 current_mach = info->mach;
245 opcodes_initialized = 1;
250 (*info->read_memory_func) (memaddr, buffer, sizeof (buffer), info);
253 (*info->memory_error_func) (status, memaddr, info);
258 /* On SPARClite variants such as DANlite (sparc86x), instructions
259 are always big-endian even when the machine is in little-endian mode. */
260 if (info->endian == BFD_ENDIAN_BIG || info->mach == bfd_mach_sparc_sparclite)
261 getword = bfd_getb32;
263 getword = bfd_getl32;
265 insn = getword (buffer);
267 info->insn_info_valid = 1; /* We do return this info */
268 info->insn_type = dis_nonbranch; /* Assume non branch insn */
269 info->branch_delay_insns = 0; /* Assume no delay */
270 info->target = 0; /* Assume no target known */
272 for (op = opcode_hash_table[HASH_INSN (insn)]; op; op = op->next)
274 CONST struct sparc_opcode *opcode = op->opcode;
276 /* If the insn isn't supported by the current architecture, skip it. */
277 if (! (opcode->architecture & current_arch_mask))
280 if ((opcode->match & insn) == opcode->match
281 && (opcode->lose & insn) == 0)
283 /* Nonzero means that we have found an instruction which has
284 the effect of adding or or'ing the imm13 field to rs1. */
285 int imm_added_to_rs1 = 0;
286 int imm_ored_to_rs1 = 0;
288 /* Nonzero means that we have found a plus sign in the args
289 field of the opcode table. */
292 /* Nonzero means we have an annulled branch. */
295 /* Do we have an `add' or `or' instruction combining an
296 immediate with rs1? */
297 if (opcode->match == 0x80102000) /* or */
299 if (opcode->match == 0x80002000) /* add */
300 imm_added_to_rs1 = 1;
302 if (X_RS1 (insn) != X_RD (insn)
303 && strchr (opcode->args, 'r') != 0)
304 /* Can't do simple format if source and dest are different. */
306 if (X_RS2 (insn) != X_RD (insn)
307 && strchr (opcode->args, 'O') != 0)
308 /* Can't do simple format if source and dest are different. */
311 (*info->fprintf_func) (stream, opcode->name);
314 register CONST char *s;
316 if (opcode->args[0] != ',')
317 (*info->fprintf_func) (stream, " ");
318 for (s = opcode->args; *s != '\0'; ++s)
322 (*info->fprintf_func) (stream, ",");
326 (*info->fprintf_func) (stream, "a");
331 (*info->fprintf_func) (stream, "pn");
336 (*info->fprintf_func) (stream, "pt");
342 } /* switch on arg */
343 } /* while there are comma started args */
345 (*info->fprintf_func) (stream, " ");
352 /* note fall-through */
354 (*info->fprintf_func) (stream, "%c", *s);
358 (*info->fprintf_func) (stream, "0");
361 #define reg(n) (*info->fprintf_func) (stream, "%%%s", reg_names[n])
377 #define freg(n) (*info->fprintf_func) (stream, "%%%s", freg_names[n])
378 #define fregx(n) (*info->fprintf_func) (stream, "%%%s", freg_names[((n) & ~1) | (((n) & 1) << 5)])
382 case 'v': /* double/even */
383 case 'V': /* quad/multiple of 4 */
384 fregx (X_RS1 (insn));
390 case 'B': /* double/even */
391 case 'R': /* quad/multiple of 4 */
392 fregx (X_RS2 (insn));
398 case 'H': /* double/even */
399 case 'J': /* quad/multiple of 4 */
405 #define creg(n) (*info->fprintf_func) (stream, "%%c%u", (unsigned int) (n))
420 (*info->fprintf_func) (stream, "%%hi(%#x)",
422 & ((int) X_IMM22 (insn) << 10)));
425 case 'i': /* 13 bit immediate */
426 case 'I': /* 11 bit immediate */
427 case 'j': /* 10 bit immediate */
432 imm = X_SIMM (insn, 13);
434 imm = X_SIMM (insn, 11);
436 imm = X_SIMM (insn, 10);
438 /* Check to see whether we have a 1+i, and take
441 Note: because of the way we sort the table,
442 we will be matching 1+i rather than i+1,
443 so it is OK to assume that i is after +,
446 imm_added_to_rs1 = 1;
449 (*info->fprintf_func) (stream, "%d", imm);
451 (*info->fprintf_func) (stream, "%#x", imm);
455 case 'X': /* 5 bit unsigned immediate */
456 case 'Y': /* 6 bit unsigned immediate */
458 int imm = X_IMM (insn, *s == 'X' ? 5 : 6);
461 (info->fprintf_func) (stream, "%d", imm);
463 (info->fprintf_func) (stream, "%#x", (unsigned) imm);
469 int mask = X_MEMBAR (insn);
470 int bit = 0x40, printed_one = 0;
474 (info->fprintf_func) (stream, "0");
481 (info->fprintf_func) (stream, "|");
482 name = sparc_decode_membar (bit);
483 (info->fprintf_func) (stream, "%s", name);
492 info->target = memaddr + SEX (X_DISP16 (insn), 16) * 4;
493 (*info->print_address_func) (info->target, info);
497 info->target = memaddr + SEX (X_DISP19 (insn), 19) * 4;
498 (*info->print_address_func) (info->target, info);
505 (*info->fprintf_func) (stream, "%%fcc%c", *s - '6' + '0');
509 (*info->fprintf_func) (stream, "%%icc");
513 (*info->fprintf_func) (stream, "%%xcc");
517 (*info->fprintf_func) (stream, "%%ccr");
521 (*info->fprintf_func) (stream, "%%fprs");
525 (*info->fprintf_func) (stream, "%%asi");
529 (*info->fprintf_func) (stream, "%%tick");
533 (*info->fprintf_func) (stream, "%%pc");
537 if (X_RS1 (insn) == 31)
538 (*info->fprintf_func) (stream, "%%ver");
539 else if ((unsigned) X_RS1 (insn) < 16)
540 (*info->fprintf_func) (stream, "%%%s",
541 v9_priv_reg_names[X_RS1 (insn)]);
543 (*info->fprintf_func) (stream, "%%reserved");
547 if ((unsigned) X_RD (insn) < 15)
548 (*info->fprintf_func) (stream, "%%%s",
549 v9_priv_reg_names[X_RD (insn)]);
551 (*info->fprintf_func) (stream, "%%reserved");
555 if (X_RS1 (insn) < 16 || X_RS1 (insn) > 23)
556 (*info->fprintf_func) (stream, "%%reserved");
558 (*info->fprintf_func) (stream, "%%%s",
559 v9a_asr_reg_names[X_RS1 (insn)-16]);
563 if (X_RD (insn) < 16 || X_RD (insn) > 23)
564 (*info->fprintf_func) (stream, "%%reserved");
566 (*info->fprintf_func) (stream, "%%%s",
567 v9a_asr_reg_names[X_RD (insn)-16]);
572 const char *name = sparc_decode_prefetch (X_RD (insn));
575 (*info->fprintf_func) (stream, "%s", name);
577 (*info->fprintf_func) (stream, "%d", X_RD (insn));
582 (*info->fprintf_func) (stream, "%%asr%d", X_RS1 (insn));
586 (*info->fprintf_func) (stream, "%%asr%d", X_RD (insn));
590 info->target = memaddr + SEX (X_DISP30 (insn), 30) * 4;
591 (*info->print_address_func) (info->target, info);
595 (*info->fprintf_func)
596 (stream, "%#x", SEX (X_DISP22 (insn), 22));
600 info->target = memaddr + SEX (X_DISP22 (insn), 22) * 4;
601 (*info->print_address_func) (info->target, info);
606 const char *name = sparc_decode_asi (X_ASI (insn));
609 (*info->fprintf_func) (stream, "%s", name);
611 (*info->fprintf_func) (stream, "(%d)", X_ASI (insn));
616 (*info->fprintf_func) (stream, "%%csr");
620 (*info->fprintf_func) (stream, "%%fsr");
624 (*info->fprintf_func) (stream, "%%psr");
628 (*info->fprintf_func) (stream, "%%fq");
632 (*info->fprintf_func) (stream, "%%cq");
636 (*info->fprintf_func) (stream, "%%tbr");
640 (*info->fprintf_func) (stream, "%%wim");
644 (*info->fprintf_func) (stream, "%d",
645 ((X_LDST_I (insn) << 8)
650 (*info->fprintf_func) (stream, "%%y");
656 int val = *s == 'U' ? X_RS1 (insn) : X_RD (insn);
657 const char *name = sparc_decode_sparclet_cpreg (val);
660 (*info->fprintf_func) (stream, "%s", name);
662 (*info->fprintf_func) (stream, "%%cpreg(%d)", val);
669 /* If we are adding or or'ing something to rs1, then
670 check to see whether the previous instruction was
671 a sethi to the same register as in the sethi.
672 If so, attempt to print the result of the add or
673 or (in this context add and or do the same thing)
674 and its symbolic value. */
675 if (imm_ored_to_rs1 || imm_added_to_rs1)
677 unsigned long prev_insn;
681 (*info->read_memory_func)
682 (memaddr - 4, buffer, sizeof (buffer), info);
683 prev_insn = getword (buffer);
687 /* If it is a delayed branch, we need to look at the
688 instruction before the delayed branch. This handles
691 sethi %o1, %hi(_foo), %o1
693 or %o1, %lo(_foo), %o1
696 if (is_delayed_branch (prev_insn))
698 errcode = (*info->read_memory_func)
699 (memaddr - 8, buffer, sizeof (buffer), info);
700 prev_insn = getword (buffer);
704 /* If there was a problem reading memory, then assume
705 the previous instruction was not sethi. */
708 /* Is it sethi to the same register? */
709 if ((prev_insn & 0xc1c00000) == 0x01000000
710 && X_RD (prev_insn) == X_RS1 (insn))
712 (*info->fprintf_func) (stream, "\t! ");
714 (0xFFFFFFFF & (int) X_IMM22 (prev_insn) << 10);
715 if (imm_added_to_rs1)
716 info->target += X_SIMM (insn, 13);
718 info->target |= X_SIMM (insn, 13);
719 (*info->print_address_func) (info->target, info);
720 info->insn_type = dis_dref;
721 info->data_size = 4; /* FIXME!!! */
726 if (opcode->flags & (F_UNBR|F_CONDBR|F_JSR))
728 /* FIXME -- check is_annulled flag */
729 if (opcode->flags & F_UNBR)
730 info->insn_type = dis_branch;
731 if (opcode->flags & F_CONDBR)
732 info->insn_type = dis_condbranch;
733 if (opcode->flags & F_JSR)
734 info->insn_type = dis_jsr;
735 if (opcode->flags & F_DELAYED)
736 info->branch_delay_insns = 1;
739 return sizeof (buffer);
743 info->insn_type = dis_noninsn; /* Mark as non-valid instruction */
744 (*info->fprintf_func) (stream, _("unknown"));
745 return sizeof (buffer);
748 /* Given BFD mach number, return a mask of SPARC_OPCODE_ARCH_FOO values. */
751 compute_arch_mask (mach)
757 case bfd_mach_sparc :
758 return SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_V8);
759 case bfd_mach_sparc_sparclet :
760 return SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_SPARCLET);
761 case bfd_mach_sparc_sparclite :
762 case bfd_mach_sparc_sparclite_le :
763 /* sparclites insns are recognized by default (because that's how
764 they've always been treated, for better or worse). Kludge this by
765 indicating generic v8 is also selected. */
766 return (SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_SPARCLITE)
767 | SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_V8));
768 case bfd_mach_sparc_v8plus :
769 case bfd_mach_sparc_v9 :
770 return SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_V9);
771 case bfd_mach_sparc_v8plusa :
772 case bfd_mach_sparc_v9a :
773 return SPARC_OPCODE_ARCH_MASK (SPARC_OPCODE_ARCH_V9A);
778 /* Compare opcodes A and B. */
781 compare_opcodes (a, b)
785 struct sparc_opcode *op0 = * (struct sparc_opcode **) a;
786 struct sparc_opcode *op1 = * (struct sparc_opcode **) b;
787 unsigned long int match0 = op0->match, match1 = op1->match;
788 unsigned long int lose0 = op0->lose, lose1 = op1->lose;
789 register unsigned int i;
791 /* If one (and only one) insn isn't supported by the current architecture,
792 prefer the one that is. If neither are supported, but they're both for
793 the same architecture, continue processing. Otherwise (both unsupported
794 and for different architectures), prefer lower numbered arch's (fudged
795 by comparing the bitmasks). */
796 if (op0->architecture & current_arch_mask)
798 if (! (op1->architecture & current_arch_mask))
803 if (op1->architecture & current_arch_mask)
805 else if (op0->architecture != op1->architecture)
806 return op0->architecture - op1->architecture;
809 /* If a bit is set in both match and lose, there is something
810 wrong with the opcode table. */
815 /* xgettext:c-format */
816 _("Internal error: bad sparc-opcode.h: \"%s\", %#.8lx, %#.8lx\n"),
817 op0->name, match0, lose0);
818 op0->lose &= ~op0->match;
826 /* xgettext:c-format */
827 _("Internal error: bad sparc-opcode.h: \"%s\", %#.8lx, %#.8lx\n"),
828 op1->name, match1, lose1);
829 op1->lose &= ~op1->match;
833 /* Because the bits that are variable in one opcode are constant in
834 another, it is important to order the opcodes in the right order. */
835 for (i = 0; i < 32; ++i)
837 unsigned long int x = 1 << i;
838 int x0 = (match0 & x) != 0;
839 int x1 = (match1 & x) != 0;
845 for (i = 0; i < 32; ++i)
847 unsigned long int x = 1 << i;
848 int x0 = (lose0 & x) != 0;
849 int x1 = (lose1 & x) != 0;
855 /* They are functionally equal. So as long as the opcode table is
856 valid, we can put whichever one first we want, on aesthetic grounds. */
858 /* Our first aesthetic ground is that aliases defer to real insns. */
860 int alias_diff = (op0->flags & F_ALIAS) - (op1->flags & F_ALIAS);
862 /* Put the one that isn't an alias first. */
866 /* Except for aliases, two "identical" instructions had
867 better have the same opcode. This is a sanity check on the table. */
868 i = strcmp (op0->name, op1->name);
871 if (op0->flags & F_ALIAS) /* If they're both aliases, be arbitrary. */
875 /* xgettext:c-format */
876 _("Internal error: bad sparc-opcode.h: \"%s\" == \"%s\"\n"),
877 op0->name, op1->name);
880 /* Fewer arguments are preferred. */
882 int length_diff = strlen (op0->args) - strlen (op1->args);
883 if (length_diff != 0)
884 /* Put the one with fewer arguments first. */
888 /* Put 1+i before i+1. */
890 char *p0 = (char *) strchr (op0->args, '+');
891 char *p1 = (char *) strchr (op1->args, '+');
895 /* There is a plus in both operands. Note that a plus
896 sign cannot be the first character in args,
897 so the following [-1]'s are valid. */
898 if (p0[-1] == 'i' && p1[1] == 'i')
899 /* op0 is i+1 and op1 is 1+i, so op1 goes first. */
901 if (p0[1] == 'i' && p1[-1] == 'i')
902 /* op0 is 1+i and op1 is i+1, so op0 goes first. */
907 /* Put 1,i before i,1. */
909 int i0 = strncmp (op0->args, "i,1", 3) == 0;
910 int i1 = strncmp (op1->args, "i,1", 3) == 0;
916 /* They are, as far as we can tell, identical.
917 Since qsort may have rearranged the table partially, there is
918 no way to tell which one was first in the opcode table as
919 written, so just say there are equal. */
920 /* ??? This is no longer true now that we sort a vector of pointers,
921 not the table itself. */
925 /* Build a hash table from the opcode table.
926 OPCODE_TABLE is a sorted list of pointers into the opcode table. */
929 build_hash_table (opcode_table, hash_table, num_opcodes)
930 const struct sparc_opcode **opcode_table;
931 struct opcode_hash **hash_table;
935 int hash_count[HASH_SIZE];
936 static struct opcode_hash *hash_buf = NULL;
938 /* Start at the end of the table and work backwards so that each
941 memset (hash_table, 0, HASH_SIZE * sizeof (hash_table[0]));
942 memset (hash_count, 0, HASH_SIZE * sizeof (hash_count[0]));
943 if (hash_buf != NULL)
945 hash_buf = (struct opcode_hash *) xmalloc (sizeof (struct opcode_hash) * num_opcodes);
946 for (i = num_opcodes - 1; i >= 0; --i)
948 register int hash = HASH_INSN (opcode_table[i]->match);
949 register struct opcode_hash *h = &hash_buf[i];
950 h->next = hash_table[hash];
951 h->opcode = opcode_table[i];
952 hash_table[hash] = h;
956 #if 0 /* for debugging */
958 int min_count = num_opcodes, max_count = 0;
961 for (i = 0; i < HASH_SIZE; ++i)
963 if (hash_count[i] < min_count)
964 min_count = hash_count[i];
965 if (hash_count[i] > max_count)
966 max_count = hash_count[i];
967 total += hash_count[i];
970 printf ("Opcode hash table stats: min %d, max %d, ave %f\n",
971 min_count, max_count, (double) total / HASH_SIZE);