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(free_insn): New variable. 

(init_emit, restore_emit_status): Clear it.
(gen_sequence): Store insn in free_insn when sequence length is 1.
(make_insn_raw): Use free_insn if available and still in the rtl generation
phase.

From-SVN: r11508
This commit is contained in:
Richard Kenner 1996-03-10 06:23:17 -05:00
parent 935ddcf539
commit 4312729434
1 changed files with 21 additions and 3 deletions
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24
gcc/emit-rtl.c
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@ -249,6 +249,9 @@ struct sequence_stack *sequence_stack;
static struct sequence_stack *sequence_element_free_list;
static rtx sequence_result[SEQUENCE_RESULT_SIZE];
/* During RTL generation, we also keep a list of free INSN rtl codes. */
static rtx free_insn;
extern int rtx_equal_function_value_matters;
/* Filename and line number of last line-number note,
@ -1494,6 +1497,8 @@ restore_emit_status (p)
sequence_element_free_list = 0;
for (i = 0; i < SEQUENCE_RESULT_SIZE; i++)
sequence_result[i] = 0;
free_insn = 0;
}
/* Go through all the RTL insn bodies and copy any invalid shared structure.
@ -2141,9 +2146,17 @@ make_insn_raw (pattern)
{
register rtx insn;
insn = rtx_alloc (INSN);
INSN_UID (insn) = cur_insn_uid++;
/* If in RTL generation phase, see if FREE_INSN can be used. */
if (free_insn != 0 && rtx_equal_function_value_matters)
{
insn = free_insn;
free_insn = NEXT_INSN (free_insn);
PUT_CODE (insn, INSN);
}
else
insn = rtx_alloc (INSN);
INSN_UID (insn) = cur_insn_uid++;
PATTERN (insn) = pattern;
INSN_CODE (insn) = -1;
LOG_LINKS (insn) = NULL;
@ -3115,7 +3128,11 @@ gen_sequence ()
/* Don't discard the call usage field. */
|| (GET_CODE (first_insn) == CALL_INSN
&& CALL_INSN_FUNCTION_USAGE (first_insn) == NULL_RTX)))
return PATTERN (first_insn);
{
NEXT_INSN (first_insn) = free_insn;
free_insn = first_insn;
return PATTERN (first_insn);
}
/* Put them in a vector. See if we already have a SEQUENCE of the
appropriate length around. */
@ -3160,6 +3177,7 @@ init_emit ()
sequence_element_free_list = 0;
for (i = 0; i < SEQUENCE_RESULT_SIZE; i++)
sequence_result[i] = 0;
free_insn = 0;
/* Init the tables that describe all the pseudo regs. */