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author | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
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committer | Ben Cheng <bccheng@google.com> | 2014-03-25 22:37:19 -0700 |
commit | 1bc5aee63eb72b341f506ad058502cd0361f0d10 (patch) | |
tree | c607e8252f3405424ff15bc2d00aa38dadbb2518 /gcc-4.9/gcc/predict.def | |
parent | 283a0bf58fcf333c58a2a92c3ebbc41fb9eb1fdb (diff) | |
download | toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.zip toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.gz toolchain_gcc-1bc5aee63eb72b341f506ad058502cd0361f0d10.tar.bz2 |
Initial checkin of GCC 4.9.0 from trunk (r208799).
Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba
Diffstat (limited to 'gcc-4.9/gcc/predict.def')
-rw-r--r-- | gcc-4.9/gcc/predict.def | 178 |
1 files changed, 178 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/predict.def b/gcc-4.9/gcc/predict.def new file mode 100644 index 0000000..145330c --- /dev/null +++ b/gcc-4.9/gcc/predict.def @@ -0,0 +1,178 @@ +/* Definitions for the branch prediction routines in the GNU compiler. + Copyright (C) 2001-2014 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 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/>. */ + +/* Before including this file, you should define a macro: + + DEF_PREDICTOR (ENUM, NAME, HITRATE) + + This macro will be called once for each predictor. The ENUM will + be of type `enum predictor', and will enumerate all supported + predictors. The order of DEF_PREDICTOR calls is important, as + in the first match combining heuristics, the predictor appearing + first in this file will win. + + NAME is used in the debugging output to determine predictor type. + + 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) + +/* An outcome estimated by Dempster-Shaffer theory. */ +DEF_PREDICTOR (PRED_DS_THEORY, "DS theory", PROB_ALWAYS, 0) + +/* A combined heuristics using probability determined by first + matching heuristics from this list. */ +DEF_PREDICTOR (PRED_FIRST_MATCH, "first match", PROB_ALWAYS, 0) + +/* Heuristic applying when no heuristic below applies. */ +DEF_PREDICTOR (PRED_NO_PREDICTION, "no prediction", PROB_ALWAYS, 0) + +/* Mark unconditional jump as taken. */ +DEF_PREDICTOR (PRED_UNCONDITIONAL, "unconditional jump", PROB_ALWAYS, + PRED_FLAG_FIRST_MATCH) + +/* 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) + +/* Assume that any given atomic operation has low contention, + and thus the compare-and-swap operation succeeds. */ +DEF_PREDICTOR (PRED_COMPARE_AND_SWAP, "compare and swap", PROB_VERY_LIKELY, + PRED_FLAG_FIRST_MATCH) + +/* Hints dropped by user via __builtin_expect feature. Note: the + probability of PROB_VERY_LIKELY is now overwritten by param + builtin_expect_probability with a default value of HITRATE(90). + Refer to param.def for details. */ +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_VERY_LIKELY, + PRED_FLAG_FIRST_MATCH) + +/* 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) + +/* Loopback edge is taken. */ +DEF_PREDICTOR (PRED_LOOP_BRANCH, "loop branch", HITRATE (86), + PRED_FLAG_FIRST_MATCH) + +/* 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 (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 (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 (71), 0) + +/* Branch causing function to terminate is probably not taken. */ +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 compare induction variable to a loop bound is + extremely likely. */ +DEF_PREDICTOR (PRED_LOOP_IV_COMPARE_GUESS, "guess loop iv compare", + PROB_VERY_LIKELY, 0) + +/* Use number of loop iterations determined by # of iterations analysis + to set probability of branches that compares IV to loop bound variable. */ +DEF_PREDICTOR (PRED_LOOP_IV_COMPARE, "loop iv compare", PROB_VERY_LIKELY, + PRED_FLAG_FIRST_MATCH) + +/* Branches to hot labels are likely. */ +DEF_PREDICTOR (PRED_HOT_LABEL, "hot label", HITRATE (85), 0) + +/* Branches to cold labels are extremely unlikely. */ +DEF_PREDICTOR (PRED_COLD_LABEL, "cold label", PROB_VERY_LIKELY, + PRED_FLAG_FIRST_MATCH) + + +/* The following predictors are used in Fortran. */ + +/* Branch leading to an integer overflow are extremely unlikely. */ +DEF_PREDICTOR (PRED_FORTRAN_OVERFLOW, "overflow", PROB_ALWAYS, + PRED_FLAG_FIRST_MATCH) + +/* Branch leading to a failure status are unlikely. This can occur for out + of memory or when trying to allocate an already allocated allocated or + deallocating an already deallocated allocatable. This predictor only + occurs when the user explicitly asked for a return status. By default, + the code aborts, which is handled via PRED_NORETURN. */ +DEF_PREDICTOR (PRED_FORTRAN_FAIL_ALLOC, "fail alloc", PROB_VERY_LIKELY, 0) + +/* Branch leading to an I/O failure status are unlikely. This predictor is + used for I/O failures such as for invalid unit numbers. This predictor + only occurs when the user explicitly asked for a return status. By default, + the code aborts, which is handled via PRED_NORETURN. */ +DEF_PREDICTOR (PRED_FORTRAN_FAIL_IO, "fail alloc", HITRATE(85), 0) + +/* Branch leading to a run-time warning message which is printed only once + are unlikely. The print-warning branch itself can be likely or unlikely. */ +DEF_PREDICTOR (PRED_FORTRAN_WARN_ONCE, "warn once", HITRATE (75), 0) + +/* Branch belonging to a zero-sized array. */ +DEF_PREDICTOR (PRED_FORTRAN_SIZE_ZERO, "zero-sized array", HITRATE(70), 0) + +/* Branch belonging to an invalid bound index, in a context where it is + standard conform and well defined but rather pointless and, hence, rather + unlikely to occur. */ +DEF_PREDICTOR (PRED_FORTRAN_INVALID_BOUND, "zero-sized array", HITRATE(90), 0) + +/* Branch belonging to the handling of absent optional arguments. This + predictor is used when an optional dummy argument, associated with an + absent argument, is passed on as actual argument to another procedure, + which in turn has an optional argument. */ +DEF_PREDICTOR (PRED_FORTRAN_ABSENT_DUMMY, "absent dummy", HITRATE(60), 0) |