gcc/ChangeLog:
2014-11-13 Martin Liska <mli...@suse.cz>
* predict.c (propagate_freq): More elegant sreal API is used.
(estimate_bb_frequencies): New static constants defined by sreal
replace precomputed ones.
* sreal.c (sreal::normalize): New function.
(sreal::to_int): Likewise.
(sreal::operator+): Likewise.
(sreal::operator-): Likewise.
* sreal.h: Definition of new functions added.
---
gcc/predict.c | 30 +++++++++++-------------
gcc/sreal.c | 56 ++++++++++++++++++++++++++++++++++++--------
gcc/sreal.h | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++-------
3 files changed, 126 insertions(+), 35 deletions(-)
diff --git a/gcc/predict.c b/gcc/predict.c
index 0215e91..0f640f5 100644
--- a/gcc/predict.c
+++ b/gcc/predict.c
@@ -82,7 +82,7 @@ along with GCC; see the file COPYING3. If not see
/* 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 sreal real_zero, real_one, real_almost_one, real_br_prob_base,
+static sreal real_almost_one, real_br_prob_base,
real_inv_br_prob_base, real_one_half, real_bb_freq_max;
static void combine_predictions_for_insn (rtx_insn *, basic_block);
@@ -2528,13 +2528,13 @@ propagate_freq (basic_block head, bitmap tovisit)
bb->count = bb->frequency = 0;
}
- BLOCK_INFO (head)->frequency = real_one;
+ BLOCK_INFO (head)->frequency = sreal::one ();
last = head;
for (bb = head; bb; bb = nextbb)
{
edge_iterator ei;
- sreal cyclic_probability = real_zero;
- sreal frequency = real_zero;
+ sreal cyclic_probability = sreal::zero ();
+ sreal frequency = sreal::zero ();
nextbb = BLOCK_INFO (bb)->next;
BLOCK_INFO (bb)->next = NULL;
@@ -2559,13 +2559,13 @@ propagate_freq (basic_block head, bitmap tovisit)
* BLOCK_INFO (e->src)->frequency /
REG_BR_PROB_BASE); */
- sreal tmp (e->probability, 0);
+ sreal tmp = e->probability;
tmp *= BLOCK_INFO (e->src)->frequency;
tmp *= real_inv_br_prob_base;
frequency += tmp;
}
- if (cyclic_probability == real_zero)
+ if (cyclic_probability == sreal::zero ())
{
BLOCK_INFO (bb)->frequency = frequency;
}
@@ -2577,7 +2577,7 @@ propagate_freq (basic_block head, bitmap tovisit)
/* BLOCK_INFO (bb)->frequency = frequency
/ (1 - cyclic_probability) */
- cyclic_probability = real_one - cyclic_probability;
+ cyclic_probability = sreal::one () - cyclic_probability;
BLOCK_INFO (bb)->frequency = frequency / cyclic_probability;
}
}
@@ -2591,7 +2591,7 @@ propagate_freq (basic_block head, bitmap tovisit)
= ((e->probability * BLOCK_INFO (bb)->frequency)
/ REG_BR_PROB_BASE); */
- sreal tmp (e->probability, 0);
+ sreal tmp = e->probability;
tmp *= BLOCK_INFO (bb)->frequency;
EDGE_INFO (e)->back_edge_prob = tmp * real_inv_br_prob_base;
}
@@ -2873,13 +2873,11 @@ estimate_bb_frequencies (bool force)
if (!real_values_initialized)
{
real_values_initialized = 1;
- real_zero = sreal (0, 0);
- real_one = sreal (1, 0);
- real_br_prob_base = sreal (REG_BR_PROB_BASE, 0);
- real_bb_freq_max = sreal (BB_FREQ_MAX, 0);
+ real_br_prob_base = REG_BR_PROB_BASE;
+ real_bb_freq_max = BB_FREQ_MAX;
real_one_half = sreal (1, -1);
- real_inv_br_prob_base = real_one / real_br_prob_base;
- real_almost_one = real_one - real_inv_br_prob_base;
+ real_inv_br_prob_base = sreal::one () / real_br_prob_base;
+ real_almost_one = sreal::one () - real_inv_br_prob_base;
}
mark_dfs_back_edges ();
@@ -2897,7 +2895,7 @@ estimate_bb_frequencies (bool force)
FOR_EACH_EDGE (e, ei, bb->succs)
{
- EDGE_INFO (e)->back_edge_prob = sreal (e->probability, 0);
+ EDGE_INFO (e)->back_edge_prob = e->probability;
EDGE_INFO (e)->back_edge_prob *= real_inv_br_prob_base;
}
}
@@ -2906,7 +2904,7 @@ estimate_bb_frequencies (bool force)
to outermost to examine frequencies for back edges. */
estimate_loops ();
- freq_max = real_zero;
+ freq_max = sreal::zero ();
FOR_EACH_BB_FN (bb, cfun)
if (freq_max < BLOCK_INFO (bb)->frequency)
freq_max = BLOCK_INFO (bb)->frequency;
diff --git a/gcc/sreal.c b/gcc/sreal.c
index 3f5456a..89b9c4d 100644
--- a/gcc/sreal.c
+++ b/gcc/sreal.c
@@ -1,4 +1,4 @@
-/* Simple data type for positive real numbers for the GNU compiler.
+/* Simple data type for real numbers for the GNU compiler.
Copyright (C) 2002-2014 Free Software Foundation, Inc.
This file is part of GCC.
@@ -17,7 +17,7 @@ You should have received a copy of the GNU General Public
License
along with GCC; see the file COPYING3. If not see
<http://www.gnu.org/licenses/>. */
-/* This library supports positive real numbers and 0;
+/* This library supports real numbers;
inf and nan are NOT supported.
It is written to be simple and fast.
@@ -102,6 +102,7 @@ sreal::normalize ()
{
if (m_sig == 0)
{
+ m_negative = 0;
m_exp = -SREAL_MAX_EXP;
}
else if (m_sig < SREAL_MIN_SIG)
@@ -153,15 +154,17 @@ sreal::normalize ()
int64_t
sreal::to_int () const
{
+ int64_t sign = m_negative ? -1 : 1;
+
if (m_exp <= -SREAL_BITS)
return 0;
if (m_exp >= SREAL_PART_BITS)
- return INTTYPE_MAXIMUM (int64_t);
+ return sign * INTTYPE_MAXIMUM (int64_t);
if (m_exp > 0)
- return m_sig << m_exp;
+ return sign * (m_sig << m_exp);
if (m_exp < 0)
- return m_sig >> -m_exp;
- return m_sig;
+ return sign * (m_sig >> -m_exp);
+ return sign * m_sig;
}
/* Return *this + other. */
@@ -169,9 +172,19 @@ sreal::to_int () const
sreal
sreal::operator+ (const sreal &other) const
{
+ const sreal *a_p = this, *b_p = &other, *bb;
+
+ if (m_negative && !other.m_negative)
+ return other + *a_p;
+
+ if (!m_negative && other.m_negative)
+ return *a_p - -other;
+
+ gcc_assert (m_negative == other.m_negative);
+
int dexp;
sreal tmp, r;
-const sreal *a_p = this, *b_p = &other, *bb;
+ r.m_negative = a_p->m_negative;
if (*a_p < *b_p)
{
@@ -211,10 +224,30 @@ sreal::operator- (const sreal &other) const
int dexp;
sreal tmp, r;
const sreal *bb;
+ const sreal *a_p = this;
+
+ /* -a - b => -a + (-b). */
+ if (m_negative && !other.m_negative)
+ return *a_p + -other;
- gcc_assert (*this >= other);
+ /* a - (-b) => a + b. */
+ if (!m_negative && other.m_negative)
+ return *a_p + -other;
+
+ gcc_assert (m_negative == other.m_negative);
+
+ /* We want to substract a smaller number from bigger
+ for nonegative numbers. */
+ if (!m_negative && *this < other)
+ return -(other - *this);
+
+ /* Example: -2 - (-3) => 3 - 2 */
+ if (m_negative && *this > other)
+ return -other - -(*this);
dexp = m_exp - other.m_exp;
+
+ r.m_negative = m_negative;
r.m_exp = m_exp;
if (dexp > SREAL_BITS)
{
@@ -240,7 +273,7 @@ sreal::operator- (const sreal &other) const
sreal
sreal::operator* (const sreal &other) const
{
-sreal r;
+ sreal r;
if (m_sig < SREAL_MIN_SIG || other.m_sig < SREAL_MIN_SIG)
{
r.m_sig = 0;
@@ -252,6 +285,8 @@ sreal r;
r.m_exp = m_exp + other.m_exp;
r.normalize ();
}
+
+ r.m_negative = m_negative ^ other.m_negative;
return r;
}
@@ -261,9 +296,10 @@ sreal
sreal::operator/ (const sreal &other) const
{
gcc_assert (other.m_sig != 0);
-sreal r;
+ sreal r;
r.m_sig = (m_sig << SREAL_PART_BITS) / other.m_sig;
r.m_exp = m_exp - other.m_exp - SREAL_PART_BITS;
+ r.m_negative = m_negative ^ other.m_negative;
r.normalize ();
return r;
}
diff --git a/gcc/sreal.h b/gcc/sreal.h
index 461e28b..bfed3c7 100644
--- a/gcc/sreal.h
+++ b/gcc/sreal.h
@@ -1,4 +1,4 @@
-/* Definitions for simple data type for positive real numbers.
+/* Definitions for simple data type for real numbers.
Copyright (C) 2002-2014 Free Software Foundation, Inc.
This file is part of GCC.
@@ -25,7 +25,7 @@ along with GCC; see the file COPYING3. If not see
#define SREAL_MIN_SIG ((uint64_t) 1 << (SREAL_PART_BITS - 1))
#define SREAL_MAX_SIG (((uint64_t) 1 << SREAL_PART_BITS) - 1)
-#define SREAL_MAX_EXP (INT_MAX / 4)
+#define SREAL_MAX_EXP (INT_MAX / 8)
#define SREAL_BITS SREAL_PART_BITS
@@ -34,10 +34,21 @@ class sreal
{
public:
/* Construct an uninitialized sreal. */
- sreal () : m_sig (-1), m_exp (-1) {}
+ sreal () : m_sig (-1), m_exp (-1), m_negative (0) {}
/* Construct a sreal. */
- sreal (uint64_t sig, int exp) : m_sig (sig), m_exp (exp) { normalize (); }
+ sreal (int64_t sig, int exp = 0) : m_exp (exp)
+ {
+ m_negative = sig < 0;
+
+ // TODO: speed up
+ if (sig < 0)
+ sig = -sig;
+
+ m_sig = (uint64_t) sig;
+
+ normalize ();
+ }
void dump (FILE *) const;
int64_t to_int () const;
@@ -49,13 +60,58 @@ public:
bool operator< (const sreal &other) const
{
- return m_exp < other.m_exp
+ if (m_negative != other.m_negative)
+ return m_negative > other.m_negative;
+
+ bool r = m_exp < other.m_exp
|| (m_exp == other.m_exp && m_sig < other.m_sig);
+
+ return m_negative ? !r : r;
}
bool operator== (const sreal &other) const
{
- return m_exp == other.m_exp && m_sig == other.m_sig;
+ return m_exp == other.m_exp && m_sig == other.m_sig
+ && m_negative == other.m_negative;
+ }
+
+ sreal operator- () const
+ {
+ if (m_sig == 0)
+ return *this;
+
+ sreal tmp = *this;
+ tmp.m_negative = !tmp.m_negative;
+
+ return tmp;
+ }
+
+ sreal shift (int sig) const
+ {
+ sreal tmp = *this;
+ tmp.m_sig += sig;
+
+ return tmp;
+ }
+
+ /* Return zero constant. */
+ inline static sreal zero ()
+ {
+ static const sreal zero = sreal (0);
+ return zero;
+ }
+
+ /* Return one constant. */
+ inline static sreal one ()
+ {
+ static const sreal one = sreal (1);
+ return one;
+ }
+
+ /* Global minimum sreal can hold. */
+ inline static sreal min ()
+ {
+ return sreal (LONG_MIN, 0);
}
private:
@@ -63,7 +119,8 @@ private:
void shift_right (int amount);
uint64_t m_sig; /* Significant. */
- signed int m_exp; /* Exponent. */
+ signed int m_exp: 31; /* Exponent. */
+ unsigned int m_negative: 1; /* Negative sign. */
};
extern void debug (sreal &ref);
@@ -76,12 +133,12 @@ inline sreal &operator+= (sreal &a, const sreal &b)
inline sreal &operator-= (sreal &a, const sreal &b)
{
-return a = a - b;
+ return a = a - b;
}
inline sreal &operator/= (sreal &a, const sreal &b)
{
-return a = a / b;
+ return a = a / b;
}
inline sreal &operator*= (sreal &a, const sreal &b)
--
2.1.2
