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re PR rtl-optimization/15633 (Failure to propagate FDO counters by vpt results in performance regression) 

2004-06-23  Pat Haugen  <pthaugen@us.ibm.com>

        PR optimization/15633
        * value-prof.c (divmod_fixed_value_transform): Compute probability
        of taking optimal path and pass along to gen_ routine.
        (mod_pow2_value_transform): Same.
        (mod_subtract_transform): Same.
        (gen_divmod_fixed_value): Add new probability parameter.
        Add probability to newly created jump.
        (gen_mod_pow2): Same.
        (gen_mod_subtract): Same.

From-SVN: r83555
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Pat Haugen 2004-06-23 16:07:58 +00:00 committed by David Edelsohn
parent dcbbf6f31b
commit 701b17c2dc
2 changed files with 74 additions and 20 deletions
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12
gcc/ChangeLog
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@ -1,3 +1,15 @@
2004-06-23 Pat Haugen <pthaugen@us.ibm.com>
PR optimization/15633
* value-prof.c (divmod_fixed_value_transform): Compute probability
of taking optimal path and pass along to gen_ routine.
(mod_pow2_value_transform): Same.
(mod_subtract_transform): Same.
(gen_divmod_fixed_value): Add new probability parameter.
Add probability to newly created jump.
(gen_mod_pow2): Same.
(gen_mod_subtract): Same.
2004-06-23 Richard Earnshaw <rearnsha@arm.com>
* PR target/15948

82
gcc/value-prof.c
View File

@ -56,10 +56,10 @@ static void insn_divmod_values_to_profile (rtx, unsigned *,
struct histogram_value **);
static void insn_values_to_profile (rtx, unsigned *, struct histogram_value **);
static rtx gen_divmod_fixed_value (enum machine_mode, enum rtx_code, rtx, rtx,
rtx, gcov_type);
static rtx gen_mod_pow2 (enum machine_mode, enum rtx_code, rtx, rtx, rtx);
rtx, gcov_type, int);
static rtx gen_mod_pow2 (enum machine_mode, enum rtx_code, rtx, rtx, rtx, int);
static rtx gen_mod_subtract (enum machine_mode, enum rtx_code, rtx, rtx, rtx,
int);
int, int, int);
static bool divmod_fixed_value_transform (rtx insn);
static bool mod_pow2_value_transform (rtx);
static bool mod_subtract_transform (rtx);
@ -365,12 +365,14 @@ rtl_value_profile_transformations (void)
}
/* Generate code for transformation 1 (with MODE and OPERATION, operands OP1
and OP2 whose value is expected to be VALUE and result TARGET). */
and OP2, whose value is expected to be VALUE, result TARGET and
probability of taking the optimal path PROB). */
static rtx
gen_divmod_fixed_value (enum machine_mode mode, enum rtx_code operation,
rtx target, rtx op1, rtx op2, gcov_type value)
rtx target, rtx op1, rtx op2, gcov_type value,
int prob)
{
rtx tmp, tmp1;
rtx tmp, tmp1, jump;
rtx neq_label = gen_label_rtx ();
rtx end_label = gen_label_rtx ();
rtx sequence;
@ -387,7 +389,15 @@ gen_divmod_fixed_value (enum machine_mode mode, enum rtx_code operation,
do_compare_rtx_and_jump (tmp, GEN_INT (value), NE, 0, mode, NULL_RTX,
NULL_RTX, neq_label);
tmp1 = simplify_gen_binary (operation, mode, copy_rtx (op1), GEN_INT (value));
/* Add branch probability to jump we just created. */
jump = get_last_insn ();
REG_NOTES (jump) = gen_rtx_EXPR_LIST (REG_BR_PROB,
GEN_INT (REG_BR_PROB_BASE - prob),
REG_NOTES (jump));
tmp1 = simplify_gen_binary (operation, mode,
copy_rtx (op1), GEN_INT (value));
tmp1 = force_operand (tmp1, target);
if (tmp1 != target)
emit_move_insn (copy_rtx (target), copy_rtx (tmp1));
@ -396,7 +406,8 @@ gen_divmod_fixed_value (enum machine_mode mode, enum rtx_code operation,
emit_barrier ();
emit_label (neq_label);
tmp1 = simplify_gen_binary (operation, mode, copy_rtx (op1), copy_rtx (tmp));
tmp1 = simplify_gen_binary (operation, mode,
copy_rtx (op1), copy_rtx (tmp));
tmp1 = force_operand (tmp1, target);
if (tmp1 != target)
emit_move_insn (copy_rtx (target), copy_rtx (tmp1));
@ -418,6 +429,7 @@ divmod_fixed_value_transform (rtx insn)
enum machine_mode mode;
gcov_type val, count, all;
edge e;
int prob;
set = single_set (insn);
if (!set)
@ -462,22 +474,26 @@ divmod_fixed_value_transform (rtx insn)
fprintf (dump_file, "Div/mod by constant transformation on insn %d\n",
INSN_UID (insn));
/* Compute probability of taking the optimal path. */
prob = (count * REG_BR_PROB_BASE + all / 2) / all;
e = split_block (BLOCK_FOR_INSN (insn), PREV_INSN (insn));
delete_insn (insn);
insert_insn_on_edge (
gen_divmod_fixed_value (mode, code, set_dest, op1, op2, val), e);
gen_divmod_fixed_value (mode, code, set_dest,
op1, op2, val, prob), e);
return true;
}
/* Generate code for transformation 2 (with MODE and OPERATION, operands OP1
and OP2 and result TARGET). */
and OP2, result TARGET and probability of taking the optimal path PROB). */
static rtx
gen_mod_pow2 (enum machine_mode mode, enum rtx_code operation, rtx target,
rtx op1, rtx op2)
rtx op1, rtx op2, int prob)
{
rtx tmp, tmp1, tmp2, tmp3;
rtx tmp, tmp1, tmp2, tmp3, jump;
rtx neq_label = gen_label_rtx ();
rtx end_label = gen_label_rtx ();
rtx sequence;
@ -498,6 +514,13 @@ gen_mod_pow2 (enum machine_mode mode, enum rtx_code operation, rtx target,
0, OPTAB_WIDEN);
do_compare_rtx_and_jump (tmp2, const0_rtx, NE, 0, mode, NULL_RTX,
NULL_RTX, neq_label);
/* Add branch probability to jump we just created. */
jump = get_last_insn ();
REG_NOTES (jump) = gen_rtx_EXPR_LIST (REG_BR_PROB,
GEN_INT (REG_BR_PROB_BASE - prob),
REG_NOTES (jump));
tmp3 = expand_simple_binop (mode, AND, op1, tmp1, target,
0, OPTAB_WIDEN);
if (tmp3 != target)
@ -528,7 +551,7 @@ mod_pow2_value_transform (rtx insn)
enum machine_mode mode;
gcov_type wrong_values, count;
edge e;
int i;
int i, all, prob;
set = single_set (insn);
if (!set)
@ -578,22 +601,27 @@ mod_pow2_value_transform (rtx insn)
fprintf (dump_file, "Mod power of 2 transformation on insn %d\n",
INSN_UID (insn));
/* Compute probability of taking the optimal path. */
all = count + wrong_values;
prob = (count * REG_BR_PROB_BASE + all / 2) / all;
e = split_block (BLOCK_FOR_INSN (insn), PREV_INSN (insn));
delete_insn (insn);
insert_insn_on_edge (
gen_mod_pow2 (mode, code, set_dest, op1, op2), e);
gen_mod_pow2 (mode, code, set_dest, op1, op2, prob), e);
return true;
}
/* Generate code for transformations 3 and 4 (with MODE and OPERATION,
operands OP1 and OP2, result TARGET and at most SUB subtractions). */
operands OP1 and OP2, result TARGET, at most SUB subtractions, and
probability of taking the optimal path(s) PROB1 and PROB2). */
static rtx
gen_mod_subtract (enum machine_mode mode, enum rtx_code operation,
rtx target, rtx op1, rtx op2, int sub)
rtx target, rtx op1, rtx op2, int sub, int prob1, int prob2)
{
rtx tmp, tmp1;
rtx tmp, tmp1, jump;
rtx end_label = gen_label_rtx ();
rtx sequence;
int i;
@ -611,7 +639,11 @@ gen_mod_subtract (enum machine_mode mode, enum rtx_code operation,
emit_move_insn (target, copy_rtx (op1));
do_compare_rtx_and_jump (target, tmp, LTU, 0, mode, NULL_RTX,
NULL_RTX, end_label);
/* Add branch probability to jump we just created. */
jump = get_last_insn ();
REG_NOTES (jump) = gen_rtx_EXPR_LIST (REG_BR_PROB,
GEN_INT (prob1), REG_NOTES (jump));
for (i = 0; i < sub; i++)
{
@ -621,6 +653,11 @@ gen_mod_subtract (enum machine_mode mode, enum rtx_code operation,
emit_move_insn (target, tmp1);
do_compare_rtx_and_jump (target, tmp, LTU, 0, mode, NULL_RTX,
NULL_RTX, end_label);
/* Add branch probability to jump we just created. */
jump = get_last_insn ();
REG_NOTES (jump) = gen_rtx_EXPR_LIST (REG_BR_PROB,
GEN_INT (prob2), REG_NOTES (jump));
}
tmp1 = simplify_gen_binary (operation, mode, copy_rtx (target), copy_rtx (tmp));
@ -645,7 +682,7 @@ mod_subtract_transform (rtx insn)
enum machine_mode mode;
gcov_type wrong_values, counts[2], count, all;
edge e;
int i;
int i, prob1, prob2;
set = single_set (insn);
if (!set)
@ -704,11 +741,16 @@ mod_subtract_transform (rtx insn)
fprintf (dump_file, "Mod subtract transformation on insn %d\n",
INSN_UID (insn));
/* Compute probability of taking the optimal path(s). */
prob1 = (counts[0] * REG_BR_PROB_BASE + all / 2) / all;
prob2 = (counts[1] * REG_BR_PROB_BASE + all / 2) / all;
e = split_block (BLOCK_FOR_INSN (insn), PREV_INSN (insn));
delete_insn (insn);
insert_insn_on_edge (
gen_mod_subtract (mode, code, set_dest, op1, op2, i), e);
gen_mod_subtract (mode, code, set_dest,
op1, op2, i, prob1, prob2), e);
return true;
}