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* flow.c (recompute_reg_usage): Use basic block info to get loop_depth. 

From-SVN: r30843
This commit is contained in:
Jan Hubicka 1999-12-09 11:51:44 +01:00 committed by Jan Hubicka
parent e73ccf83b6
commit 5dd56a932b
2 changed files with 45 additions and 49 deletions
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2
gcc/ChangeLog
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@ -1,5 +1,7 @@
Thu Dec 9 11:36:24 MET 1999 Jan Hubicka <hubicka@freesoft.cz>
* flow.c (recompute_reg_usage): Use basic block info to get loop_depth.
* combine.c (try_combine, distribute_notes): Remove REG_N_REFS
updating code.

92
gcc/flow.c
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@ -5578,6 +5578,7 @@ recompute_reg_usage (f, loop_step)
{
rtx insn;
int i, max_reg;
int index;
/* Clear out the old data. */
max_reg = max_reg_num ();
@ -5590,58 +5591,51 @@ recompute_reg_usage (f, loop_step)
/* Scan each insn in the chain and count how many times each register is
set/used. */
loop_depth = 1;
for (insn = f; insn; insn = NEXT_INSN (insn))
for (index = 0; index < n_basic_blocks; index++)
{
/* Keep track of loop depth. */
if (GET_CODE (insn) == NOTE)
{
/* Look for loop boundaries. */
if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_END)
loop_depth -= loop_step;
else if (NOTE_LINE_NUMBER (insn) == NOTE_INSN_LOOP_BEG)
loop_depth += loop_step;
/* If we have LOOP_DEPTH == 0, there has been a bookkeeping error.
Abort now rather than setting register status incorrectly. */
if (loop_depth == 0)
abort ();
}
else if (GET_RTX_CLASS (GET_CODE (insn)) == 'i')
{
rtx links;
/* This call will increment REG_N_SETS for each SET or CLOBBER
of a register in INSN. It will also increment REG_N_REFS
by the loop depth for each set of a register in INSN. */
count_reg_sets (PATTERN (insn));
/* count_reg_sets does not detect autoincrement address modes, so
detect them here by looking at the notes attached to INSN. */
for (links = REG_NOTES (insn); links; links = XEXP (links, 1))
basic_block bb = BASIC_BLOCK (index);
loop_depth = bb->loop_depth;
for (insn = bb->head; insn; insn = NEXT_INSN (insn))
{
if (GET_RTX_CLASS (GET_CODE (insn)) == 'i')
{
if (REG_NOTE_KIND (links) == REG_INC)
/* Count (weighted) references, stores, etc. This counts a
register twice if it is modified, but that is correct. */
REG_N_SETS (REGNO (XEXP (links, 0)))++;
}
/* This call will increment REG_N_REFS by the current loop depth for
each reference to a register in INSN. */
count_reg_references (PATTERN (insn));
/* count_reg_references will not include counts for arguments to
function calls, so detect them here by examining the
CALL_INSN_FUNCTION_USAGE data. */
if (GET_CODE (insn) == CALL_INSN)
{
rtx note;
for (note = CALL_INSN_FUNCTION_USAGE (insn);
note;
note = XEXP (note, 1))
if (GET_CODE (XEXP (note, 0)) == USE)
count_reg_references (XEXP (XEXP (note, 0), 0));
rtx links;
/* This call will increment REG_N_SETS for each SET or CLOBBER
of a register in INSN. It will also increment REG_N_REFS
by the loop depth for each set of a register in INSN. */
count_reg_sets (PATTERN (insn));
/* count_reg_sets does not detect autoincrement address modes, so
detect them here by looking at the notes attached to INSN. */
for (links = REG_NOTES (insn); links; links = XEXP (links, 1))
{
if (REG_NOTE_KIND (links) == REG_INC)
/* Count (weighted) references, stores, etc. This counts a
register twice if it is modified, but that is correct. */
REG_N_SETS (REGNO (XEXP (links, 0)))++;
}
/* This call will increment REG_N_REFS by the current loop depth for
each reference to a register in INSN. */
count_reg_references (PATTERN (insn));
/* count_reg_references will not include counts for arguments to
function calls, so detect them here by examining the
CALL_INSN_FUNCTION_USAGE data. */
if (GET_CODE (insn) == CALL_INSN)
{
rtx note;
for (note = CALL_INSN_FUNCTION_USAGE (insn);
note;
note = XEXP (note, 1))
if (GET_CODE (XEXP (note, 0)) == USE)
count_reg_references (XEXP (XEXP (note, 0), 0));
}
}
if (insn == bb->end)
break;
}
}
}