CbC/CbC_gcc: gcc/profile-count.h comparison

comparison gcc/profile-count.h @ 111:04ced10e8804

gcc 7

author	kono
date	Fri, 27 Oct 2017 22:46:09 +0900
parents
children	84e7813d76e9

comparison

equal deleted inserted replaced

-:561a7518be6b
+:04ced10e8804
+/* Profile counter container type.
+Copyright (C) 2017 Free Software Foundation, Inc.
+Contributed by Jan Hubicka
+This file is part of GCC.
+GCC is free software; you can redistribute it and/or modify it under
+the terms of the GNU General Public License as published by the Free
+Software Foundation; either version 3, or (at your option) any later
+version.
+GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+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/>.  */
+#ifndef GCC_PROFILE_COUNT_H
+#define GCC_PROFILE_COUNT_H
+/* Quality of the profile count.  Because gengtype does not support enums
+inside of classes, this is in global namespace.  */
+enum profile_quality {
+/* Profile is based on static branch prediction heuristics.  It may or may
+not reflect the reality.  */
+profile_guessed = 0,
+/* Profile was determined by autofdo.  */
+profile_afdo = 1,
+/* Profile was originally based on feedback but it was adjusted
+by code duplicating optimization.  It may not precisely reflect the
+particular code path.  */
+profile_adjusted = 2,
+/* Profile was read from profile feedback or determined by accurate static
+method.  */
+profile_precise = 3
+};
+/* The base value for branch probability notes and edge probabilities.  */
+#define REG_BR_PROB_BASE  10000
+#define RDIV(X,Y) (((X) + (Y) / 2) / (Y))
+bool slow_safe_scale_64bit (uint64_t a, uint64_t b, uint64_t c, uint64_t *res);
+/* Compute RES=(a*b + c/2)/c capping and return false if overflow happened.  */
+inline bool
+safe_scale_64bit (uint64_t a, uint64_t b, uint64_t c, uint64_t *res)
+{
+#if (GCC_VERSION >= 5000)
+uint64_t tmp;
+if (!__builtin_mul_overflow (a, b, &tmp)
+&& !__builtin_add_overflow (tmp, c/2, &tmp))
+{
+*res = tmp / c;
+return true;
+}
+if (c == 1)
+{
+*res = (uint64_t) -1;
+return false;
+}
+#else
+if (a < ((uint64_t)1 << 31)
+&& b < ((uint64_t)1 << 31)
+&& c < ((uint64_t)1 << 31))
+{
+*res = (a * b + (c / 2)) / c;
+return true;
+}
+#endif
+return slow_safe_scale_64bit (a, b, c, res);
+}
+/* Data type to hold probabilities.  It implements fixed point arithmetics
+with capping so probability is always in range [0,1] and scaling requiring
+values greater than 1 needs to be represented otherwise.
+In addition to actual value the quality of profile is tracked and propagated
+through all operations.  Special value UNINITIALIZED is used for probabilities
+that has not been determined yet (for example bacause of
+-fno-guess-branch-probability)
+Typically probabilities are derived from profile feedback (via
+probability_in_gcov_type), autoFDO or guessed statically and then propagated
+thorough the compilation.
+Named probabilities are available:
+- never           (0 probability)
+- guessed_never
+- very_unlikely   (1/2000 probability)
+- unlikely        (1/5 probablity)
+- even            (1/2 probability)
+- likely          (4/5 probability)
+- very_likely     (1999/2000 probability)
+- guessed_always
+- always
+Named probabilities except for never/always are assumed to be statically
+guessed and thus not necessarily accurate.  The difference between never
+and guessed_never is that the first one should be used only in case that
+well behaving program will very likely not execute the "never" path.
+For example if the path is going to abort () call or it exception handling.
+Always and guessed_always probabilities are symmetric.
+For legacy code we support conversion to/from REG_BR_PROB_BASE based fixpoint
+integer arithmetics. Once the code is converted to branch probabilities,
+these conversions will probably go away because they are lossy.
+*/
+class GTY((user)) profile_probability
+{
+static const int n_bits = 30;
+/* We can technically use ((uint32_t) 1 << (n_bits - 1)) - 2 but that
+will lead to harder multiplication sequences.  */
+static const uint32_t max_probability = (uint32_t) 1 << (n_bits - 2);
+static const uint32_t uninitialized_probability
+		 = ((uint32_t) 1 << (n_bits - 1)) - 1;
+uint32_t m_val : 30;
+enum profile_quality m_quality : 2;
+friend class profile_count;
+public:
+/* Named probabilities.  */
+static profile_probability never ()
+{
+profile_probability ret;
+ret.m_val = 0;
+ret.m_quality = profile_precise;
+return ret;
+}
+static profile_probability guessed_never ()
+{
+profile_probability ret;
+ret.m_val = 0;
+ret.m_quality = profile_guessed;
+return ret;
+}
+static profile_probability very_unlikely ()
+{
+/* Be consistent with PROB_VERY_UNLIKELY in predict.h.  */
+profile_probability r
+	 = profile_probability::always ().apply_scale (1, 2000);
+r.m_val--;
+return r;
+}
+static profile_probability unlikely ()
+{
+/* Be consistent with PROB_VERY_LIKELY in predict.h.  */
+profile_probability r
+	 = profile_probability::always ().apply_scale (1, 5);
+r.m_val--;
+return r;
+}
+static profile_probability even ()
+{
+return profile_probability::always ().apply_scale (1, 2);
+}
+static profile_probability very_likely ()
+{
+return profile_probability::always () - very_unlikely ();
+}
+static profile_probability likely ()
+{
+return profile_probability::always () - unlikely ();
+}
+static profile_probability guessed_always ()
+{
+profile_probability ret;
+ret.m_val = max_probability;
+ret.m_quality = profile_guessed;
+return ret;
+}
+static profile_probability always ()
+{
+profile_probability ret;
+ret.m_val = max_probability;
+ret.m_quality = profile_precise;
+return ret;
+}
+/* Probabilities which has not been initialized. Either because
+initialization did not happen yet or because profile is unknown.  */
+static profile_probability uninitialized ()
+{
+profile_probability c;
+c.m_val = uninitialized_probability;
+c.m_quality = profile_guessed;
+return c;
+}
+/* Return true if value has been initialized.  */
+bool initialized_p () const
+{
+return m_val != uninitialized_probability;
+}
+/* Return true if value can be trusted.  */
+bool reliable_p () const
+{
+return m_quality >= profile_adjusted;
+}
+/* Conversion from and to REG_BR_PROB_BASE integer fixpoint arithmetics.
+this is mostly to support legacy code and should go away.  */
+static profile_probability from_reg_br_prob_base (int v)
+{
+profile_probability ret;
+gcc_checking_assert (v >= 0 && v <= REG_BR_PROB_BASE);
+ret.m_val = RDIV (v * (uint64_t) max_probability, REG_BR_PROB_BASE);
+ret.m_quality = profile_guessed;
+return ret;
+}
+int to_reg_br_prob_base () const
+{
+gcc_checking_assert (initialized_p ());
+return RDIV (m_val * (uint64_t) REG_BR_PROB_BASE, max_probability);
+}
+/* Conversion to and from RTL representation of profile probabilities.  */
+static profile_probability from_reg_br_prob_note (int v)
+{
+profile_probability ret;
+ret.m_val = ((unsigned int)v) / 4;
+ret.m_quality = (enum profile_quality)(v & 3);
+return ret;
+}
+int to_reg_br_prob_note () const
+{
+gcc_checking_assert (initialized_p ());
+int ret = m_val * 4 + m_quality;
+gcc_checking_assert (profile_probability::from_reg_br_prob_note (ret)
+			   == *this);
+return ret;
+}
+/* Return VAL1/VAL2.  */
+static profile_probability probability_in_gcov_type
+				 (gcov_type val1, gcov_type val2)
+{
+profile_probability ret;
+gcc_checking_assert (val1 >= 0 && val2 > 0);
+if (val1 > val2)
+	ret.m_val = max_probability;
+else
+	{
+	  uint64_t tmp;
+	  safe_scale_64bit (val1, max_probability, val2, &tmp);
+	  gcc_checking_assert (tmp <= max_probability);
+	  ret.m_val = tmp;
+	}
+ret.m_quality = profile_precise;
+return ret;
+}
+/* Basic operations.  */
+bool operator== (const profile_probability &other) const
+{
+return m_val == other.m_val && m_quality == other.m_quality;
+}
+profile_probability operator+ (const profile_probability &other) const
+{
+if (other == profile_probability::never ())
+	return *this;
+if (*this == profile_probability::never ())
+	return other;
+if (!initialized_p () || !other.initialized_p ())
+	return profile_probability::uninitialized ();
+profile_probability ret;
+ret.m_val = MIN ((uint32_t)(m_val + other.m_val), max_probability);
+ret.m_quality = MIN (m_quality, other.m_quality);
+return ret;
+}
+profile_probability &operator+= (const profile_probability &other)
+{
+if (other == profile_probability::never ())
+	return *this;
+if (*this == profile_probability::never ())
+	{
+	  *this = other;
+	  return *this;
+	}
+if (!initialized_p () || !other.initialized_p ())
+	return *this = profile_probability::uninitialized ();
+else
+	{
+	  m_val = MIN ((uint32_t)(m_val + other.m_val), max_probability);
+	  m_quality = MIN (m_quality, other.m_quality);
+	}
+return *this;
+}
+profile_probability operator- (const profile_probability &other) const
+{
+if (*this == profile_probability::never ()
+	  || other == profile_probability::never ())
+	return *this;
+if (!initialized_p () || !other.initialized_p ())
+	return profile_probability::uninitialized ();
+profile_probability ret;
+ret.m_val = m_val >= other.m_val ? m_val - other.m_val : 0;
+ret.m_quality = MIN (m_quality, other.m_quality);
+return ret;
+}
+profile_probability &operator-= (const profile_probability &other)
+{
+if (*this == profile_probability::never ()
+	  || other == profile_probability::never ())
+	return *this;
+if (!initialized_p () || !other.initialized_p ())
+	return *this = profile_probability::uninitialized ();
+else
+	{
+	  m_val = m_val >= other.m_val ? m_val - other.m_val : 0;
+	  m_quality = MIN (m_quality, other.m_quality);
+	}
+return *this;
+}
+profile_probability operator* (const profile_probability &other) const
+{
+if (*this == profile_probability::never ()
+	  || other == profile_probability::never ())
+	return profile_probability::never ();
+if (!initialized_p () || !other.initialized_p ())
+	return profile_probability::uninitialized ();
+profile_probability ret;
+ret.m_val = RDIV ((uint64_t)m_val * other.m_val, max_probability);
+ret.m_quality = MIN (m_quality, other.m_quality);
+return ret;
+}
+profile_probability &operator*= (const profile_probability &other)
+{
+if (*this == profile_probability::never ()
+	  || other == profile_probability::never ())
+	return *this = profile_probability::never ();
+if (!initialized_p () || !other.initialized_p ())
+	return *this = profile_probability::uninitialized ();
+else
+	{
+	  m_val = RDIV ((uint64_t)m_val * other.m_val, max_probability);
+	  m_quality = MIN (m_quality, other.m_quality);
+	}
+return *this;
+}
+profile_probability operator/ (const profile_probability &other) const
+{
+if (*this == profile_probability::never ())
+	return profile_probability::never ();
+if (!initialized_p () || !other.initialized_p ())
+	return profile_probability::uninitialized ();
+profile_probability ret;
+if (m_val >= other.m_val)
+	ret.m_val = max_probability;
+else if (!m_val)
+	ret.m_val = 0;
+else
+	{
+	  gcc_checking_assert (other.m_val);
+	  ret.m_val = MIN (RDIV ((uint64_t)m_val * max_probability,
+				 other.m_val),
+			   max_probability);
+	}
+ret.m_quality = MIN (m_quality, other.m_quality);
+return ret;
+}
+profile_probability &operator/= (const profile_probability &other)
+{
+if (*this == profile_probability::never ())
+	return *this = profile_probability::never ();
+if (!initialized_p () || !other.initialized_p ())
+	return *this = profile_probability::uninitialized ();
+else
+	{
+	  if (m_val > other.m_val)
+	    m_val = max_probability;
+	  else if (!m_val)
+	    ;
+	  else
+	    {
+	      gcc_checking_assert (other.m_val);
+	      m_val = MIN (RDIV ((uint64_t)m_val * max_probability,
+				 other.m_val),
+			   max_probability);
+	    }
+	  m_quality = MIN (m_quality, other.m_quality);
+	}
+return *this;
+}
+gcov_type apply (gcov_type val) const
+{
+if (*this == profile_probability::uninitialized ())
+	return val / 2;
+return RDIV (val * m_val, max_probability);
+}
+/* Return 1-*THIS.  */
+profile_probability invert () const
+{
+return profile_probability::always() - *this;
+}
+/* Return THIS with quality dropped to GUESSED.  */
+profile_probability guessed () const
+{
+profile_probability ret = *this;
+ret.m_quality = profile_guessed;
+return ret;
+}
+/* Return THIS with quality dropped to AFDO.  */
+profile_probability afdo () const
+{
+profile_probability ret = *this;
+ret.m_quality = profile_afdo;
+return ret;
+}
+profile_probability combine_with_freq (int freq1, profile_probability other,
+					 int freq2) const
+{
+profile_probability ret;
+if (*this == profile_probability::uninitialized ()
+	  || other == profile_probability::uninitialized ())
+	return profile_probability::uninitialized ();
+gcc_checking_assert (freq1 >= 0 && freq2 >= 0);
+if (!freq1 && !freq2)
+	{
+	  ret.m_val = (m_val + other.m_val) / 2;
+	}
+else
+	ret.m_val = RDIV (m_val * (uint64_t) freq1
+			  + other.m_val * (uint64_t) freq2, freq1 + freq2);
+ret.m_quality = MIN (m_quality, other.m_quality);
+return ret;
+}
+/* Return *THIS * NUM / DEN.  */
+profile_probability apply_scale (int64_t num, int64_t den) const
+{
+if (*this == profile_probability::never ())
+	return *this;
+if (!initialized_p ())
+	return profile_probability::uninitialized ();
+profile_probability ret;
+uint64_t tmp;
+safe_scale_64bit (m_val, num, den, &tmp);
+ret.m_val = MIN (tmp, max_probability);
+ret.m_quality = MIN (m_quality, profile_adjusted);
+return ret;
+}
+/* Return true when the probability of edge is reliable.
+The profile guessing code is good at predicting branch outcome (ie.
+taken/not taken), that is predicted right slightly over 75% of time.
+It is however notoriously poor on predicting the probability itself.
+In general the profile appear a lot flatter (with probabilities closer
+to 50%) than the reality so it is bad idea to use it to drive optimization
+such as those disabling dynamic branch prediction for well predictable
+branches.
+There are two exceptions - edges leading to noreturn edges and edges
+predicted by number of iterations heuristics are predicted well.  This macro
+should be able to distinguish those, but at the moment it simply check for
+noreturn heuristic that is only one giving probability over 99% or bellow
+1%.  In future we might want to propagate reliability information across the
+CFG if we find this information useful on multiple places.   */
+bool probably_reliable_p () const
+{
+if (m_quality >= profile_adjusted)
+	return true;
+if (!initialized_p ())
+	return false;
+return m_val < max_probability / 100
+	     || m_val > max_probability - max_probability / 100;
+}
+/* Return false if profile_probability is bogus.  */
+bool verify () const
+{
+if (m_val == uninitialized_probability)
+	return m_quality == profile_guessed;
+else
+	return m_val <= max_probability;
+}
+/* Comparsions are three-state and conservative.  False is returned if
+the inequality can not be decided.  */
+bool operator< (const profile_probability &other) const
+{
+return initialized_p () && other.initialized_p () && m_val < other.m_val;
+}
+bool operator> (const profile_probability &other) const
+{
+return initialized_p () && other.initialized_p () && m_val > other.m_val;
+}
+bool operator<= (const profile_probability &other) const
+{
+return initialized_p () && other.initialized_p () && m_val <= other.m_val;
+}
+bool operator>= (const profile_probability &other) const
+{
+return initialized_p () && other.initialized_p () && m_val >= other.m_val;
+}
+/* Output THIS to F.  */
+void dump (FILE *f) const;
+/* Print THIS to stderr.  */
+void debug () const;
+/* Return true if THIS is known to differ significantly from OTHER.  */
+bool differs_from_p (profile_probability other) const;
+/* Return if difference is greater than 50%.  */
+bool differs_lot_from_p (profile_probability other) const;
+/* LTO streaming support.  */
+static profile_probability stream_in (struct lto_input_block *);
+void stream_out (struct output_block *);
+void stream_out (struct lto_output_stream *);
+};
+/* Main data type to hold profile counters in GCC.  In most cases profile
+counts originate from profile feedback. They are 64bit integers
+representing number of executions during the train run.
+As the profile is maintained during the compilation, many adjustments are
+made.  Not all transformations can be made precisely, most importantly
+when code is being duplicated.  It also may happen that part of CFG has
+profile counts known while other do not - for example when LTO optimizing
+partly profiled program or when profile was lost due to COMDAT merging.
+For this reason profile_count tracks more information than
+just unsigned integer and it is also ready for profile mismatches.
+The API of this data type represent operations that are natural
+on profile counts - sum, difference and operation with scales and
+probabilities.  All operations are safe by never getting negative counts
+and they do end up in uninitialized scale if any of the parameters is
+uninitialized.
+All comparsions that are three state and handling of probabilities.  Thus
+a < b is not equal to !(a >= b).
+The following pre-defined counts are available:
+profile_count::zero ()  for code that is known to execute zero times at
+runtime (this can be detected statically i.e. for paths leading to
+abort ();
+profile_count::one () for code that is known to execute once (such as
+main () function
+profile_count::uninitialized ()  for unknown execution count.
+*/
+class GTY(()) profile_count
+{
+/* Use 62bit to hold basic block counters.  Should be at least
+64bit.  Although a counter cannot be negative, we use a signed
+type to hold various extra stages.  */
+static const int n_bits = 62;
+static const uint64_t max_count = ((uint64_t) 1 << n_bits) - 2;
+static const uint64_t uninitialized_count = ((uint64_t) 1 << n_bits) - 1;
+uint64_t m_val : n_bits;
+enum profile_quality m_quality : 2;
+public:
+/* Used for counters which are expected to be never executed.  */
+static profile_count zero ()
+{
+return from_gcov_type (0);
+}
+static profile_count guessed_zero ()
+{
+profile_count c;
+c.m_val = 0;
+c.m_quality = profile_guessed;
+return c;
+}
+static profile_count one ()
+{
+return from_gcov_type (1);
+}
+/* Value of counters which has not been initialized. Either because
+initialization did not happen yet or because profile is unknown.  */
+static profile_count uninitialized ()
+{
+profile_count c;
+c.m_val = uninitialized_count;
+c.m_quality = profile_guessed;
+return c;
+}
+/* The profiling runtime uses gcov_type, which is usually 64bit integer.
+Conversions back and forth are used to read the coverage and get it
+into internal representation.  */
+static profile_count from_gcov_type (gcov_type v)
+{
+profile_count ret;
+gcc_checking_assert (v >= 0 && (uint64_t) v <= max_count);
+ret.m_val = v;
+ret.m_quality = profile_precise;
+return ret;
+}
+/* Conversion to gcov_type is lossy.  */
+gcov_type to_gcov_type () const
+{
+gcc_checking_assert (initialized_p ());
+return m_val;
+}
+/* Return true if value has been initialized.  */
+bool initialized_p () const
+{
+return m_val != uninitialized_count;
+}
+/* Return true if value can be trusted.  */
+bool reliable_p () const
+{
+return m_quality >= profile_adjusted;
+}
+/* When merging basic blocks, the two different profile counts are unified.
+Return true if this can be done without losing info about profile.
+The only case we care about here is when first BB contains something
+that makes it terminate in a way not visible in CFG.  */
+bool ok_for_merging (profile_count other) const
+{
+if (m_quality < profile_adjusted
+	  || other.m_quality < profile_adjusted)
+	return true;
+return !(other < *this);
+}
+/* When merging two BBs with different counts, pick common count that looks
+most representative.  */
+profile_count merge (profile_count other) const
+{
+if (*this == other || !other.initialized_p ()
+	  || m_quality > other.m_quality)
+	return *this;
+if (other.m_quality > m_quality
+	  || other > *this)
+	return other;
+return *this;
+}
+/* Basic operations.  */
+bool operator== (const profile_count &other) const
+{
+return m_val == other.m_val && m_quality == other.m_quality;
+}
+profile_count operator+ (const profile_count &other) const
+{
+if (other == profile_count::zero ())
+	return *this;
+if (*this == profile_count::zero ())
+	return other;
+if (!initialized_p () || !other.initialized_p ())
+	return profile_count::uninitialized ();
+profile_count ret;
+ret.m_val = m_val + other.m_val;
+ret.m_quality = MIN (m_quality, other.m_quality);
+return ret;
+}
+profile_count &operator+= (const profile_count &other)
+{
+if (other == profile_count::zero ())
+	return *this;
+if (*this == profile_count::zero ())
+	{
+	  *this = other;
+	  return *this;
+	}
+if (!initialized_p () || !other.initialized_p ())
+	return *this = profile_count::uninitialized ();
+else
+	{
+	  m_val += other.m_val;
+	  m_quality = MIN (m_quality, other.m_quality);
+	}
+return *this;
+}
+profile_count operator- (const profile_count &other) const
+{
+if (*this == profile_count::zero () || other == profile_count::zero ())
+	return *this;
+if (!initialized_p () || !other.initialized_p ())
+	return profile_count::uninitialized ();
+profile_count ret;
+ret.m_val = m_val >= other.m_val ? m_val - other.m_val : 0;
+ret.m_quality = MIN (m_quality, other.m_quality);
+return ret;
+}
+profile_count &operator-= (const profile_count &other)
+{
+if (*this == profile_count::zero () || other == profile_count::zero ())
+	return *this;
+if (!initialized_p () || !other.initialized_p ())
+	return *this = profile_count::uninitialized ();
+else
+	{
+	  m_val = m_val >= other.m_val ? m_val - other.m_val: 0;
+	  m_quality = MIN (m_quality, other.m_quality);
+	}
+return *this;
+}
+/* Return false if profile_count is bogus.  */
+bool verify () const
+{
+return m_val != uninitialized_count || m_quality == profile_guessed;
+}
+/* Comparsions are three-state and conservative.  False is returned if
+the inequality can not be decided.  */
+bool operator< (const profile_count &other) const
+{
+return initialized_p () && other.initialized_p () && m_val < other.m_val;
+}
+bool operator> (const profile_count &other) const
+{
+return initialized_p () && other.initialized_p () && m_val > other.m_val;
+}
+bool operator< (const gcov_type other) const
+{
+gcc_checking_assert (other >= 0);
+return initialized_p () && m_val < (uint64_t) other;
+}
+bool operator> (const gcov_type other) const
+{
+gcc_checking_assert (other >= 0);
+return initialized_p () && m_val > (uint64_t) other;
+}
+bool operator<= (const profile_count &other) const
+{
+return initialized_p () && other.initialized_p () && m_val <= other.m_val;
+}
+bool operator>= (const profile_count &other) const
+{
+return initialized_p () && other.initialized_p () && m_val >= other.m_val;
+}
+bool operator<= (const gcov_type other) const
+{
+gcc_checking_assert (other >= 0);
+return initialized_p () && m_val <= (uint64_t) other;
+}
+bool operator>= (const gcov_type other) const
+{
+gcc_checking_assert (other >= 0);
+return initialized_p () && m_val >= (uint64_t) other;
+}
+/* PROB is a probability in scale 0...REG_BR_PROB_BASE.  Scale counter
+accordingly.  */
+profile_count apply_probability (int prob) const
+{
+gcc_checking_assert (prob >= 0 && prob <= REG_BR_PROB_BASE);
+if (m_val == 0)
+	return *this;
+if (!initialized_p ())
+	return profile_count::uninitialized ();
+profile_count ret;
+ret.m_val = RDIV (m_val * prob, REG_BR_PROB_BASE);
+ret.m_quality = MIN (m_quality, profile_adjusted);
+return ret;
+}
+/* Scale counter according to PROB.  */
+profile_count apply_probability (profile_probability prob) const
+{
+if (*this == profile_count::zero ())
+	return *this;
+if (prob == profile_probability::never ())
+	return profile_count::zero ();
+if (!initialized_p ())
+	return profile_count::uninitialized ();
+profile_count ret;
+uint64_t tmp;
+safe_scale_64bit (m_val, prob.m_val, profile_probability::max_probability,
+			&tmp);
+ret.m_val = tmp;
+ret.m_quality = MIN (m_quality, prob.m_quality);
+return ret;
+}
+/* Return *THIS * NUM / DEN.  */
+profile_count apply_scale (int64_t num, int64_t den) const
+{
+if (m_val == 0)
+	return *this;
+if (!initialized_p ())
+	return profile_count::uninitialized ();
+profile_count ret;
+uint64_t tmp;
+gcc_checking_assert (num >= 0 && den > 0);
+safe_scale_64bit (m_val, num, den, &tmp);
+ret.m_val = MIN (tmp, max_count);
+ret.m_quality = MIN (m_quality, profile_adjusted);
+return ret;
+}
+profile_count apply_scale (profile_count num, profile_count den) const
+{
+if (m_val == 0)
+	return *this;
+if (num.m_val == 0)
+	return num;
+if (!initialized_p () || !num.initialized_p () || !den.initialized_p ())
+	return profile_count::uninitialized ();
+gcc_checking_assert (den > 0);
+if (num == den)
+	return *this;
+profile_count ret;
+uint64_t val;
+safe_scale_64bit (m_val, num.m_val, den.m_val, &val);
+ret.m_val = MIN (val, max_count);
+ret.m_quality = MIN (m_quality, profile_adjusted);
+return ret;
+}
+/* Return THIS with quality dropped to GUESSED.  */
+profile_count guessed () const
+{
+profile_count ret = *this;
+ret.m_quality = profile_guessed;
+return ret;
+}
+/* Return THIS with quality dropped to AFDO.  */
+profile_count afdo () const
+{
+profile_count ret = *this;
+ret.m_quality = profile_afdo;
+return ret;
+}
+/* Return probability of event with counter THIS within event with counter
+OVERALL.  */
+profile_probability probability_in (const profile_count overall) const
+{
+if (!m_val)
+	return profile_probability::never ();
+if (!initialized_p () || !overall.initialized_p ()
+	  || !overall.m_val)
+	return profile_probability::uninitialized ();
+profile_probability ret;
+if (overall < m_val)
+	ret.m_val = profile_probability::max_probability;
+else
+	ret.m_val = RDIV (m_val * profile_probability::max_probability,
+			  overall.m_val);
+ret.m_quality = MIN (m_quality, overall.m_quality);
+return ret;
+}
+/* Output THIS to F.  */
+void dump (FILE *f) const;
+/* Print THIS to stderr.  */
+void debug () const;
+/* Return true if THIS is known to differ significantly from OTHER.  */
+bool differs_from_p (profile_count other) const;
+/* LTO streaming support.  */
+static profile_count stream_in (struct lto_input_block *);
+void stream_out (struct output_block *);
+void stream_out (struct lto_output_stream *);
+};
+#endif

Mercurial > hg > CbC > CbC_gcc

comparison gcc/profile-count.h @ 111:04ced10e8804