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genattrtab.c (simplify_test_exp_in_temp): New function.

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* genattrtab.c (simplify_test_exp_in_temp): New function.
        (simplify_test_exp): Avoid explicit use of temporary obstack.
        (simplify_cond, insert_right_side, evaluate_eq_attr,
        simplify_and_tree, simplify_or_tree, eliminate_known_true):
        Use simplify_test_exp_in_temp.
        (optimize_attrs): Iterate until expression stabilizes.

From-SVN: r44890
This commit is contained in:
Jan Hubicka 2001-08-14 15:01:20 +02:00 committed by Jan Hubicka
parent 3119bd48cc
commit 2d515d60b3
2 changed files with 72 additions and 43 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
Tue Aug 14 14:57:07 CEST 2001 Jan Hubicka <jh@suse.cz>
* genattrtab.c (simplify_test_exp_in_temp): New function.
(simplify_test_exp): Avoid explicit use of temporary obstack.
(simplify_cond, insert_right_side, evaluate_eq_attr,
simplify_and_tree, simplify_or_tree, eliminate_known_true):
Use simplify_test_exp_in_temp.
(optimize_attrs): Iterate until expression stabilizes.
2001-08-13 Ulrich Weigand <uweigand@de.ibm.com>:
* glimits.h: Remove the __LONG_MAX__ special case for s390x.

106
gcc/genattrtab.c
View File

@ -417,6 +417,7 @@ static rtx evaluate_eq_attr PARAMS ((rtx, rtx, int, int));
static rtx simplify_and_tree PARAMS ((rtx, rtx *, int, int));
static rtx simplify_or_tree PARAMS ((rtx, rtx *, int, int));
static rtx simplify_test_exp PARAMS ((rtx, int, int));
static rtx simplify_test_exp_in_temp PARAMS ((rtx, int, int));
static void optimize_attrs PARAMS ((void));
static void gen_attr PARAMS ((rtx, int));
static int count_alternatives PARAMS ((rtx));
@ -2593,7 +2594,7 @@ simplify_cond (exp, insn_code, insn_index)
rtx newtest, newval;
/* Simplify this test. */
newtest = SIMPLIFY_TEST_EXP (tests[i], insn_code, insn_index);
newtest = simplify_test_exp_in_temp (tests[i], insn_code, insn_index);
tests[i] = newtest;
newval = tests[i + 1];
@ -2782,7 +2783,7 @@ insert_right_side (code, exp, term, insn_code, insn_index)
newexp = attr_rtx (code, exp, term);
}
return SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index);
return simplify_test_exp_in_temp (newexp, insn_code, insn_index);
}
/* If we have an expression which AND's a bunch of
@ -2910,8 +2911,8 @@ evaluate_eq_attr (exp, value, insn_code, insn_index)
for (i = 0; i < XVECLEN (value, 0); i += 2)
{
rtx this = SIMPLIFY_TEST_EXP (XVECEXP (value, 0, i),
insn_code, insn_index);
rtx this = simplify_test_exp_in_temp (XVECEXP (value, 0, i),
insn_code, insn_index);
SIMPLIFY_ALTERNATIVE (this);
@ -2992,7 +2993,7 @@ simplify_and_tree (exp, pterm, insn_code, insn_index)
{
newexp = attr_rtx (GET_CODE (exp), left, right);
exp = SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index);
exp = simplify_test_exp_in_temp (newexp, insn_code, insn_index);
}
}
@ -3015,7 +3016,7 @@ simplify_and_tree (exp, pterm, insn_code, insn_index)
{
newexp = attr_rtx (GET_CODE (exp), left, right);
exp = SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index);
exp = simplify_test_exp_in_temp (newexp, insn_code, insn_index);
}
}
@ -3111,7 +3112,7 @@ simplify_or_tree (exp, pterm, insn_code, insn_index)
{
newexp = attr_rtx (GET_CODE (exp), left, right);
exp = SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index);
exp = simplify_test_exp_in_temp (newexp, insn_code, insn_index);
}
}
@ -3134,7 +3135,7 @@ simplify_or_tree (exp, pterm, insn_code, insn_index)
{
newexp = attr_rtx (GET_CODE (exp), left, right);
exp = SIMPLIFY_TEST_EXP (newexp, insn_code, insn_index);
exp = simplify_test_exp_in_temp (newexp, insn_code, insn_index);
}
}
@ -3207,6 +3208,29 @@ attr_rtx_cost (x)
return cost;
}
/* Simplify test expression and use temporary obstack in order to avoid
memory bloat. Use RTX_UNCHANGING_P to avoid unnecesary simplifications
and avoid unnecesary copying if possible. */
static rtx
simplify_test_exp_in_temp (exp, insn_code, insn_index)
rtx exp;
int insn_code, insn_index;
{
rtx x;
struct obstack *old;
if (RTX_UNCHANGING_P (exp))
return exp;
old = rtl_obstack;
rtl_obstack = temp_obstack;
x = simplify_test_exp (exp, insn_code, insn_index);
rtl_obstack = old;
if (x == exp || rtl_obstack == temp_obstack)
return x;
return attr_copy_rtx (x);
}
/* Given an expression, see if it can be simplified for a particular insn
code based on the values of other attributes being tested. This can
eliminate nested get_attr_... calls.
@ -3464,13 +3488,10 @@ simplify_test_exp (exp, insn_code, insn_index)
if (ie->insn_code == insn_code)
{
rtx x;
struct obstack *old = rtl_obstack;
rtl_obstack = temp_obstack;
x = evaluate_eq_attr (exp, av->value, insn_code, insn_index);
x = SIMPLIFY_TEST_EXP (x, insn_code, insn_index);
rtl_obstack = old;
if (attr_rtx_cost(x) < 20)
return attr_copy_rtx (x);
return x;
}
break;
@ -3499,7 +3520,6 @@ optimize_attrs ()
struct attr_value *av;
struct insn_ent *ie;
rtx newexp;
int something_changed = 1;
int i;
struct attr_value_list
{
@ -3556,42 +3576,42 @@ optimize_attrs ()
for (iv = insn_code_values[i]; iv; iv = iv->next)
clear_struct_flag (iv->av->value);
/* Loop until nothing changes for one iteration. */
something_changed = 1;
while (something_changed)
for (iv = insn_code_values[i]; iv; iv = iv->next)
{
something_changed = 0;
for (iv = insn_code_values[i]; iv; iv = iv->next)
{
struct obstack *old = rtl_obstack;
struct obstack *old = rtl_obstack;
attr = iv->attr;
av = iv->av;
ie = iv->ie;
if (GET_CODE (av->value) != COND)
continue;
attr = iv->attr;
av = iv->av;
ie = iv->ie;
if (GET_CODE (av->value) != COND)
continue;
rtl_obstack = temp_obstack;
rtl_obstack = temp_obstack;
#if 0 /* This was intended as a speed up, but it was slower. */
if (insn_n_alternatives[ie->insn_code] > 6
&& count_sub_rtxs (av->value, 200) >= 200)
newexp = simplify_by_alternatives (av->value, ie->insn_code,
ie->insn_index);
else
if (insn_n_alternatives[ie->insn_code] > 6
&& count_sub_rtxs (av->value, 200) >= 200)
newexp = simplify_by_alternatives (av->value, ie->insn_code,
ie->insn_index);
else
#endif
newexp = simplify_cond (av->value, ie->insn_code,
ie->insn_index);
newexp = av->value;
while (GET_CODE (newexp) == COND)
{
rtx newexp2 = simplify_cond (newexp, ie->insn_code,
ie->insn_index);
if (newexp2 == newexp)
break;
newexp = newexp2;
}
rtl_obstack = old;
if (newexp != av->value)
{
newexp = attr_copy_rtx (newexp);
remove_insn_ent (av, ie);
av = get_attr_value (newexp, attr, ie->insn_code);
iv->av = av;
insert_insn_ent (av, ie);
something_changed = 1;
}
rtl_obstack = old;
if (newexp != av->value)
{
newexp = attr_copy_rtx (newexp);
remove_insn_ent (av, ie);
av = get_attr_value (newexp, attr, ie->insn_code);
iv->av = av;
insert_insn_ent (av, ie);
}
}
}