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ifcvt.c (cond_exec_process_insns): New argument prob_val.

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* ifcvt.c (cond_exec_process_insns): New argument prob_val.
        Attach it to call insns.
        (cond_exec_process_if_block): Track probability for true and
        false branches.
        (dead_or_predicable): Likewise.

From-SVN: r33791
This commit is contained in:
Richard Henderson 2000-05-08 23:12:51 -07:00
parent afe48e0687
commit 2ff00dd433
1 changed files with 36 additions and 10 deletions
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38
gcc/ifcvt.c
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@ -74,7 +74,7 @@ static int count_bb_insns PARAMS ((basic_block));
static rtx first_active_insn PARAMS ((basic_block));
static int last_active_insn_p PARAMS ((basic_block, rtx));
static int cond_exec_process_insns PARAMS ((rtx, rtx, rtx, int));
static int cond_exec_process_insns PARAMS ((rtx, rtx, rtx, rtx, int));
static rtx cond_exec_get_condition PARAMS ((rtx));
static int cond_exec_process_if_block PARAMS ((basic_block, basic_block,
basic_block, basic_block));
@ -179,10 +179,11 @@ last_active_insn_p (bb, insn)
insns were processed. */
static int
cond_exec_process_insns (start, end, test, mod_ok)
cond_exec_process_insns (start, end, test, prob_val, mod_ok)
rtx start; /* first insn to look at */
rtx end; /* last insn to look at */
rtx test; /* conditional execution test */
rtx prob_val; /* probability of branch taken. */
int mod_ok; /* true if modifications ok last insn. */
{
int must_be_last = FALSE;
@ -212,6 +213,11 @@ cond_exec_process_insns (start, end, test, mod_ok)
gen_rtx_COND_EXEC (VOIDmode, copy_rtx (test),
PATTERN (insn)), 1);
if (GET_CODE (insn) == CALL_INSN && prob_val)
validate_change (insn, &REG_NOTES (insn),
alloc_EXPR_LIST (REG_BR_PROB, prob_val,
REG_NOTES (insn)), 1);
insn_done:
if (insn == end)
break;
@ -267,6 +273,8 @@ cond_exec_process_if_block (test_bb, then_bb, else_bb, join_bb)
int then_mod_ok; /* whether conditional mods are ok in THEN */
rtx true_expr; /* test for else block insns */
rtx false_expr; /* test for then block insns */
rtx true_prob_val; /* probability of else block */
rtx false_prob_val; /* probability of then block */
int n_insns;
/* Find the conditional jump to the ELSE or JOIN part, and isolate
@ -324,6 +332,15 @@ cond_exec_process_if_block (test_bb, then_bb, else_bb, join_bb)
GET_MODE (true_expr), XEXP (true_expr, 0),
XEXP (true_expr, 1));
true_prob_val = find_reg_note (test_bb->end, REG_BR_PROB, NULL_RTX);
if (true_prob_val)
{
true_prob_val = XEXP (true_prob_val, 0);
false_prob_val = GEN_INT (REG_BR_PROB_BASE - INTVAL (true_prob_val));
}
else
false_prob_val = NULL_RTX;
/* For IF-THEN-ELSE blocks, we don't allow modifications of the test
on then THEN block. */
then_mod_ok = (else_bb == NULL_BLOCK);
@ -333,12 +350,12 @@ cond_exec_process_if_block (test_bb, then_bb, else_bb, join_bb)
if (then_end
&& ! cond_exec_process_insns (then_start, then_end,
false_expr, then_mod_ok))
false_expr, false_prob_val, then_mod_ok))
goto fail;
if (else_bb
&& ! cond_exec_process_insns (else_start, else_end,
true_expr, TRUE))
true_expr, true_prob_val, TRUE))
goto fail;
if (! apply_change_group ())
@ -1792,15 +1809,24 @@ dead_or_predicable (test_bb, merge_bb, other_bb, new_dest, reversep)
All that's left is making sure the insns involved can actually
be predicated. */
rtx cond;
rtx cond, prob_val;
cond = cond_exec_get_condition (jump);
prob_val = find_reg_note (jump, REG_BR_PROB, NULL_RTX);
if (prob_val)
prob_val = XEXP (prob_val, 0);
if (reversep)
{
cond = gen_rtx_fmt_ee (reverse_condition (GET_CODE (cond)),
GET_MODE (cond), XEXP (cond, 0),
XEXP (cond, 1));
if (prob_val)
prob_val = GEN_INT (REG_BR_PROB_BASE - INTVAL (prob_val));
}
if (! cond_exec_process_insns (head, end, cond, 0))
if (! cond_exec_process_insns (head, end, cond, prob_val, 0))
goto cancel;
earliest = jump;