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Segher Boessenkool <segher@koffie.nl>

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* predict.c (real_inv_br_prob_base): New variable.
	(propagate_freq): Use multiply by reciprocal instead of
	division.  Don't divide by 1.0 at all.
	(estimate_bb_frequencies): Similar.

From-SVN: r61326
This commit is contained in:
Segher Boessenkool 2003-01-15 13:07:46 +01:00 • committed by Josef Zlomek
parent 7c005a3a45
commit fbe3b30b02
2 changed files with 31 additions and 20 deletions
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7
gcc/ChangeLog
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@ -1,3 +1,10 @@
2003-01-15 Segher Boessenkool <segher@koffie.nl>
* predict.c (real_inv_br_prob_base): New variable.
(propagate_freq): Use multiply by reciprocal instead of
division. Don't divide by 1.0 at all.
(estimate_bb_frequencies): Similar.
2003-01-15 Alexandre Oliva <aoliva@redhat.com>
* configure.in (libgcc_visibility): Force disabled on IRIX 6 too.

44
gcc/predict.c
View file

@ -53,10 +53,10 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA
#include "target.h"
#include "loop.h"
/* real constants: 0, 1, 1-1/REG_BR_PROB_BASE, REG_BR_PROB_BASE, 0.5,
REAL_BB_FREQ_MAX. */
/* real constants: 0, 1, 1-1/REG_BR_PROB_BASE, REG_BR_PROB_BASE,
1/REG_BR_PROB_BASE, 0.5, BB_FREQ_MAX. */
static REAL_VALUE_TYPE real_zero, real_one, real_almost_one, real_br_prob_base,
real_one_half, real_bb_freq_max;
real_inv_br_prob_base, real_one_half, real_bb_freq_max;
/* Random guesstimation given names. */
#define PROB_VERY_UNLIKELY (REG_BR_PROB_BASE / 10 - 1)
@ -988,20 +988,25 @@ propagate_freq (loop)
TYPE_MODE (double_type_node));
REAL_ARITHMETIC (tmp, MULT_EXPR, tmp,
BLOCK_INFO (e->src)->frequency);
REAL_ARITHMETIC (tmp, RDIV_EXPR, tmp, real_br_prob_base);
REAL_ARITHMETIC (tmp, MULT_EXPR, tmp, real_inv_br_prob_base);
REAL_ARITHMETIC (frequency, PLUS_EXPR, frequency, tmp);
}
if (REAL_VALUES_LESS (real_almost_one, cyclic_probability))
memcpy (&cyclic_probability, &real_almost_one, sizeof (real_zero));
if (REAL_VALUES_IDENTICAL (cyclic_probability, real_zero))
memcpy (&BLOCK_INFO (bb)->frequency, &frequency, sizeof (frequency));
else
{
if (REAL_VALUES_LESS (real_almost_one, cyclic_probability))
memcpy (&cyclic_probability, &real_almost_one, sizeof (real_zero));
/* BLOCK_INFO (bb)->frequency = frequency / (1 - cyclic_probability)
*/
/* BLOCK_INFO (bb)->frequency = frequency / (1 - cyclic_probability)
*/
REAL_ARITHMETIC (cyclic_probability, MINUS_EXPR, real_one,
REAL_ARITHMETIC (cyclic_probability, MINUS_EXPR, real_one,
cyclic_probability);
REAL_ARITHMETIC (BLOCK_INFO (bb)->frequency,
RDIV_EXPR, frequency, cyclic_probability);
REAL_ARITHMETIC (BLOCK_INFO (bb)->frequency,
RDIV_EXPR, frequency, cyclic_probability);
}
}
BLOCK_INFO (bb)->tovisit = 0;
@ -1020,7 +1025,7 @@ propagate_freq (loop)
REAL_ARITHMETIC (tmp, MULT_EXPR, tmp,
BLOCK_INFO (bb)->frequency);
REAL_ARITHMETIC (EDGE_INFO (e)->back_edge_prob,
RDIV_EXPR, tmp, real_br_prob_base);
MULT_EXPR, tmp, real_inv_br_prob_base);
}
@ -1151,11 +1156,9 @@ estimate_bb_frequencies (loops)
REAL_VALUE_FROM_INT (real_br_prob_base, REG_BR_PROB_BASE, 0, double_mode);
REAL_VALUE_FROM_INT (real_bb_freq_max, BB_FREQ_MAX, 0, double_mode);
REAL_VALUE_FROM_INT (real_one_half, 2, 0, double_mode);
REAL_ARITHMETIC (real_one_half, RDIV_EXPR, real_one, real_one_half);
REAL_ARITHMETIC (real_almost_one, RDIV_EXPR, real_one, real_br_prob_base);
REAL_ARITHMETIC (real_almost_one, MINUS_EXPR, real_one, real_almost_one);
REAL_ARITHMETIC (real_inv_br_prob_base, RDIV_EXPR, real_one, real_br_prob_base);
REAL_ARITHMETIC (real_almost_one, MINUS_EXPR, real_one, real_inv_br_prob_base);
mark_dfs_back_edges ();
/* Fill in the probability values in flowgraph based on the REG_BR_PROB
@ -1199,8 +1202,8 @@ estimate_bb_frequencies (loops)
REAL_VALUE_FROM_INT (EDGE_INFO (e)->back_edge_prob,
e->probability, 0, double_mode);
REAL_ARITHMETIC (EDGE_INFO (e)->back_edge_prob,
RDIV_EXPR, EDGE_INFO (e)->back_edge_prob,
real_br_prob_base);
MULT_EXPR, EDGE_INFO (e)->back_edge_prob,
real_inv_br_prob_base);
}
}
@ -1215,13 +1218,14 @@ estimate_bb_frequencies (loops)
memcpy (&freq_max, &BLOCK_INFO (bb)->frequency,
sizeof (freq_max));
REAL_ARITHMETIC (freq_max, RDIV_EXPR, real_bb_freq_max, freq_max);
FOR_BB_BETWEEN (bb, ENTRY_BLOCK_PTR, NULL, next_bb)
{
REAL_VALUE_TYPE tmp;
REAL_ARITHMETIC (tmp, MULT_EXPR, BLOCK_INFO (bb)->frequency,
real_bb_freq_max);
REAL_ARITHMETIC (tmp, RDIV_EXPR, tmp, freq_max);
freq_max);
REAL_ARITHMETIC (tmp, PLUS_EXPR, tmp, real_one_half);
bb->frequency = REAL_VALUE_UNSIGNED_FIX (tmp);
}