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(length_used): New variable. 

(walk_attr_value): Set it when we have (eq_attr "length" ...).
(write_const_num_delay_slots): Value is 1 unless LENGTH_USED is set.

From-SVN: r2229
This commit is contained in:
Richard Kenner 1992-09-24 07:28:09 -04:00
parent ba12108c7a
commit d7c665bf13
1 changed files with 18 additions and 7 deletions
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25
gcc/genattrtab.c
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@ -248,6 +248,7 @@ static int got_define_asm_attributes;
static int must_extract;
static int must_constrain;
static int address_used;
static int length_used;
static int num_delays;
static int have_annul_true, have_annul_false;
static int num_units;
@ -4489,6 +4490,7 @@ max_attr_value (exp)
`must_extract' if we need to extract the insn operands
`must_constrain' if we must compute `which_alternative'
`address_used' if an address expression was used
`length_used' if an (eq_attr "length" ...) was used
*/
static void
@ -4520,6 +4522,8 @@ walk_attr_value (exp)
case EQ_ATTR:
if (XSTR (exp, 0) == alternative_name)
must_extract = must_constrain = 1;
else if (strcmp (XSTR (exp, 0), "length") == 0)
length_used = 1;
return;
case MATCH_DUP:
@ -4772,7 +4776,7 @@ write_attr_case (attr, av, write_case_lines, prefix, suffix, indent, known_true)
printf ("default:\n");
}
/* See what we have to do to handle output this value. */
/* See what we have to do to output this value. */
must_extract = must_constrain = address_used = 0;
walk_attr_value (av->value);
@ -5408,7 +5412,9 @@ fancy_abort ()
fatal ("Internal gcc abort.");
}
/* Determine if an insn has a constant number of delay slots. */
/* Determine if an insn has a constant number of delay slots, i.e., the
number of delay slots is not a function of the length of the insn. */
void
write_const_num_delay_slots ()
{
@ -5426,13 +5432,18 @@ write_const_num_delay_slots ()
printf (" {\n");
for (av = attr->first_value; av; av = av->next)
if (GET_CODE (av->value) == COND && av->num_insns)
{
for (ie = av->first_insn; ie; ie = ie->next)
{
length_used = 0;
walk_attr_value (av->value);
if (length_used)
{
for (ie = av->first_insn; ie; ie = ie->next)
if (ie->insn_code != -1)
printf (" case %d:\n", ie->insn_code);
printf (" return 0;\n");
}
printf (" return 0;\n");
}
}
printf (" default:\n");
printf (" return 1;\n");
printf (" }\n}\n");