gcc/gimple-predict.h

   1 /* Gimple prediction routines.
   2
   3    Copyright (C) 2007-2018 Free Software Foundation, Inc.
   4
   5 This file is part of GCC.
   6
   7 GCC is free software; you can redistribute it and/or modify it under
   8 the terms of the GNU General Public License as published by the Free
   9 Software Foundation; either version 3, or (at your option) any later
  10 version.
  11
  12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
  13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14 FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15 for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GCC; see the file COPYING3.  If not see
  19 <http://www.gnu.org/licenses/>.  */
  20
  21 #ifndef GCC_GIMPLE_PREDICT_H
  22 #define GCC_GIMPLE_PREDICT_H
  23
  24 #include "predict.h"
  25
  26 /* Return the predictor of GIMPLE_PREDICT statement GS.  */
  27
  28 static inline enum br_predictor
  29 gimple_predict_predictor (gimple *gs)
  30 {
  31   GIMPLE_CHECK (gs, GIMPLE_PREDICT);
  32   return (enum br_predictor) (gs->subcode & ~GF_PREDICT_TAKEN);
  33 }
  34
  35
  36 /* Set the predictor of GIMPLE_PREDICT statement GS to PREDICT.  */
  37
  38 static inline void
  39 gimple_predict_set_predictor (gimple *gs, enum br_predictor predictor)
  40 {
  41   GIMPLE_CHECK (gs, GIMPLE_PREDICT);
  42   gs->subcode = (gs->subcode & GF_PREDICT_TAKEN)
  43                        | (unsigned) predictor;
  44 }
  45
  46
  47 /* Return the outcome of GIMPLE_PREDICT statement GS.  */
  48
  49 static inline enum prediction
  50 gimple_predict_outcome (gimple *gs)
  51 {
  52   GIMPLE_CHECK (gs, GIMPLE_PREDICT);
  53   return (gs->subcode & GF_PREDICT_TAKEN) ? TAKEN : NOT_TAKEN;
  54 }
  55
  56
  57 /* Set the outcome of GIMPLE_PREDICT statement GS to OUTCOME.  */
  58
  59 static inline void
  60 gimple_predict_set_outcome (gimple *gs, enum prediction outcome)
  61 {
  62   GIMPLE_CHECK (gs, GIMPLE_PREDICT);
  63   if (outcome == TAKEN)
  64     gs->subcode |= GF_PREDICT_TAKEN;
  65   else
  66     gs->subcode &= ~GF_PREDICT_TAKEN;
  67 }
  68
  69 /* Build a GIMPLE_PREDICT statement.  PREDICT is one of the predictors from
  70    predict.def, OUTCOME is NOT_TAKEN or TAKEN.  */
  71
  72 inline gimple *
  73 gimple_build_predict (enum br_predictor predictor, enum prediction outcome)
  74 {
  75   gimple *p = gimple_alloc (GIMPLE_PREDICT, 0);
  76   /* Ensure all the predictors fit into the lower bits of the subcode.  */
  77   gcc_assert ((int) END_PREDICTORS <= GF_PREDICT_TAKEN);
  78   gimple_predict_set_predictor (p, predictor);
  79   gimple_predict_set_outcome (p, outcome);
  80   return p;
  81 }
  82
  83 /* Return true if GS is a GIMPLE_PREDICT statement.  */
  84
  85 static inline bool
  86 is_gimple_predict (const gimple *gs)
  87 {
  88   return gimple_code (gs) == GIMPLE_PREDICT;
  89 }
  90
  91 #endif  /* GCC_GIMPLE_PREDICT_H */