X-Git-Url: http://git.sourceforge.jp/view?a=blobdiff_plain;f=gcc%2Fpredict.def;h=4b3e87aa568cbf5b48a3426d6d32ba93d28a92ad;hb=2f9d02c69a655b593cf30bf985851382f018733a;hp=cc6831d82f19436addf0c1046db91261da011ff7;hpb=ba38e12bb0d3217ec8d46df4431fff1f944e432e;p=pf3gnuchains%2Fgcc-fork.git diff --git a/gcc/predict.def b/gcc/predict.def index cc6831d82f1..4b3e87aa568 100644 --- a/gcc/predict.def +++ b/gcc/predict.def @@ -1,12 +1,11 @@ -/* This file contains the definitions and documentation for the - builtins used in the GNU compiler. - Copyright (C) 2001 Free Software Foundation, Inc. +/* Definitions for the branch prediction routines in the GNU compiler. + Copyright (C) 2001, 2003, 2004, 2007, 2008 Free Software Foundation, Inc. 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 2, or (at your option) any later +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 @@ -15,9 +14,8 @@ 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 COPYING. If not, write to the Free -Software Foundation, 59 Temple Place - Suite 330, Boston, MA -02111-1307, USA. */ +along with GCC; see the file COPYING3. If not see +. */ /* Before including this file, you should define a macro: @@ -34,7 +32,7 @@ Software Foundation, 59 Temple Place - Suite 330, Boston, MA HITRATE is the probability that edge predicted by predictor as taken will be really taken (so it should be always above REG_BR_PROB_BASE / 2). */ - + /* A value used as final outcome of all heuristics. */ DEF_PREDICTOR (PRED_COMBINED, "combined", PROB_ALWAYS, 0) @@ -42,7 +40,7 @@ DEF_PREDICTOR (PRED_COMBINED, "combined", PROB_ALWAYS, 0) /* An outcome estimated by Dempster-Shaffer theory. */ DEF_PREDICTOR (PRED_DS_THEORY, "DS theory", PROB_ALWAYS, 0) -/* An combined heuristics using probability determined by first +/* A combined heuristics using probability determined by first matching heuristics from this list. */ DEF_PREDICTOR (PRED_FIRST_MATCH, "first match", PROB_ALWAYS, 0) @@ -53,9 +51,9 @@ DEF_PREDICTOR (PRED_NO_PREDICTION, "no prediction", PROB_ALWAYS, 0) DEF_PREDICTOR (PRED_UNCONDITIONAL, "unconditional jump", PROB_ALWAYS, PRED_FLAG_FIRST_MATCH) -/* Use number of loop iterations determined by loop unroller to set - probability. We don't want to use Dempster-Shaffer theory here, - as the predictions is exact. */ +/* Use number of loop iterations determined by # of iterations + analysis to set probability. We don't want to use Dempster-Shaffer + theory here, as the predictions is exact. */ DEF_PREDICTOR (PRED_LOOP_ITERATIONS, "loop iterations", PROB_ALWAYS, PRED_FLAG_FIRST_MATCH) @@ -63,38 +61,58 @@ DEF_PREDICTOR (PRED_LOOP_ITERATIONS, "loop iterations", PROB_ALWAYS, DEF_PREDICTOR (PRED_BUILTIN_EXPECT, "__builtin_expect", PROB_VERY_LIKELY, PRED_FLAG_FIRST_MATCH) +/* Use number of loop iterations guessed by the contents of the loop. */ +DEF_PREDICTOR (PRED_LOOP_ITERATIONS_GUESSED, "guessed loop iterations", + PROB_ALWAYS, PRED_FLAG_FIRST_MATCH) + +/* Branch containing goto is probably not taken. */ +DEF_PREDICTOR (PRED_CONTINUE, "continue", HITRATE (50), 0) + /* Branch to basic block containing call marked by noreturn attribute. */ -DEF_PREDICTOR (PRED_NORETURN, "noreturn call", PROB_ALWAYS, +DEF_PREDICTOR (PRED_NORETURN, "noreturn call", PROB_VERY_LIKELY, PRED_FLAG_FIRST_MATCH) -/* Loopback edge is taken. */ -DEF_PREDICTOR (PRED_LOOP_BRANCH, "loop branch", HITRATE (89), +/* Branch to basic block containing call marked by cold function attribute. */ +DEF_PREDICTOR (PRED_COLD_FUNCTION, "cold function call", PROB_VERY_LIKELY, PRED_FLAG_FIRST_MATCH) -/* Edge causing loop to terminate is probably not taken. */ -DEF_PREDICTOR (PRED_LOOP_EXIT, "loop exit", HITRATE (90), +/* Loopback edge is taken. */ +DEF_PREDICTOR (PRED_LOOP_BRANCH, "loop branch", HITRATE (86), PRED_FLAG_FIRST_MATCH) -/* Condition emitted by preconditiong code to ensure that variable - setting number of iterations is greater than initial value of iterator. */ -DEF_PREDICTOR (PRED_LOOP_CONDITION, "loop condition", PROB_VERY_LIKELY, 0) - -/* Preconditioning makes linear list of branches. */ -DEF_PREDICTOR (PRED_LOOP_PRECONDITIONING, "loop preconditioning", PROB_VERY_LIKELY, 0) - -/* Copied condition for the first iteration of loop is probably true. */ -DEF_PREDICTOR (PRED_LOOP_HEADER, "loop header", HITRATE (64), 0) +/* Edge causing loop to terminate is probably not taken. */ +DEF_PREDICTOR (PRED_LOOP_EXIT, "loop exit", HITRATE (91), + PRED_FLAG_FIRST_MATCH) /* Pointers are usually not NULL. */ -DEF_PREDICTOR (PRED_POINTER, "pointer", HITRATE (83), 0) +DEF_PREDICTOR (PRED_POINTER, "pointer", HITRATE (85), 0) +DEF_PREDICTOR (PRED_TREE_POINTER, "pointer (on trees)", HITRATE (85), 0) /* NE is probable, EQ not etc... */ -DEF_PREDICTOR (PRED_OPCODE_POSITIVE, "opcode values positive", HITRATE (78), 0) -DEF_PREDICTOR (PRED_OPCODE_NONEQUAL, "opcode values nonequal", HITRATE (70), 0) +DEF_PREDICTOR (PRED_OPCODE_POSITIVE, "opcode values positive", HITRATE (79), 0) +DEF_PREDICTOR (PRED_OPCODE_NONEQUAL, "opcode values nonequal", HITRATE (71), 0) DEF_PREDICTOR (PRED_FPOPCODE, "fp_opcode", HITRATE (90), 0) +DEF_PREDICTOR (PRED_TREE_OPCODE_POSITIVE, "opcode values positive (on trees)", HITRATE (73), 0) +DEF_PREDICTOR (PRED_TREE_OPCODE_NONEQUAL, "opcode values nonequal (on trees)", HITRATE (72), 0) +DEF_PREDICTOR (PRED_TREE_FPOPCODE, "fp_opcode (on trees)", HITRATE (90), 0) /* Branch guarding call is probably taken. */ -DEF_PREDICTOR (PRED_CALL, "call", HITRATE (70), 0) +DEF_PREDICTOR (PRED_CALL, "call", HITRATE (71), 0) /* Branch causing function to terminate is probably not taken. */ -DEF_PREDICTOR (PRED_ERROR_RETURN, "error return", PROB_LIKELY, 0) +DEF_PREDICTOR (PRED_TREE_EARLY_RETURN, "early return (on trees)", HITRATE (61), 0) + +/* Branch containing goto is probably not taken. */ +DEF_PREDICTOR (PRED_GOTO, "goto", HITRATE (70), 0) + +/* Branch ending with return constant is probably not taken. */ +DEF_PREDICTOR (PRED_CONST_RETURN, "const return", HITRATE (67), 0) + +/* Branch ending with return negative constant is probably not taken. */ +DEF_PREDICTOR (PRED_NEGATIVE_RETURN, "negative return", HITRATE (96), 0) + +/* Branch ending with return; is probably not taken */ +DEF_PREDICTOR (PRED_NULL_RETURN, "null return", HITRATE (90), 0) + +/* Branches to a mudflap bounds check are extremely unlikely. */ +DEF_PREDICTOR (PRED_MUDFLAP, "mudflap check", PROB_VERY_LIKELY, 0)