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| author | Martin Liska <mliska@suse.cz> | 2018-01-19 13:05:20 +0100 |
|---|---|---|
| committer | Martin Liska <marxin@gcc.gnu.org> | 2018-01-19 12:05:20 +0000 |
| commit | e2a1e6a441f9ced9412609cd4d8ae8ede52628a3 (patch) | |
| tree | 4b5b32f73bb7f7d32c6c5d3c9876f543a772cdf4 /gcc/predict.def | |
| parent | d1b9a5724b8a05d2d2d51b3e5d13cc785326c74f (diff) | |
| download | gcc-e2a1e6a441f9ced9412609cd4d8ae8ede52628a3.zip gcc-e2a1e6a441f9ced9412609cd4d8ae8ede52628a3.tar.gz gcc-e2a1e6a441f9ced9412609cd4d8ae8ede52628a3.tar.bz2 | |
Introduce PROB_UNINITIALIZED constant and use it in predict.def.
2018-01-19 Martin Liska <mliska@suse.cz>
* predict.c (predict_insn_def): Add new assert.
(struct branch_predictor): Change type to signed integer.
(test_prediction_value_range): Amend test to cover
PROB_UNINITIALIZED.
* predict.def (PRED_LOOP_ITERATIONS): Use the new constant.
(PRED_LOOP_ITERATIONS_GUESSED): Likewise.
(PRED_LOOP_ITERATIONS_MAX): Likewise.
(PRED_LOOP_IV_COMPARE): Likewise.
* predict.h (PROB_UNINITIALIZED): Define new constant.
From-SVN: r256887
Diffstat (limited to 'gcc/predict.def')
| -rw-r--r-- | gcc/predict.def | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/gcc/predict.def b/gcc/predict.def index 0f37e39..390b9a3 100644 --- a/gcc/predict.def +++ b/gcc/predict.def @@ -54,7 +54,7 @@ DEF_PREDICTOR (PRED_UNCONDITIONAL, "unconditional jump", PROB_ALWAYS, /* 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, +DEF_PREDICTOR (PRED_LOOP_ITERATIONS, "loop iterations", PROB_UNINITIALIZED, PRED_FLAG_FIRST_MATCH) /* Assume that any given atomic operation has low contention, @@ -71,11 +71,11 @@ DEF_PREDICTOR (PRED_BUILTIN_EXPECT, "__builtin_expect", PROB_VERY_LIKELY, /* 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) + PROB_UNINITIALIZED, PRED_FLAG_FIRST_MATCH) /* Use number of loop iterations guessed by the contents of the loop. */ DEF_PREDICTOR (PRED_LOOP_ITERATIONS_MAX, "guessed loop iterations", - PROB_ALWAYS, PRED_FLAG_FIRST_MATCH) + PROB_UNINITIALIZED, PRED_FLAG_FIRST_MATCH) /* Branch containing goto is probably not taken. */ DEF_PREDICTOR (PRED_CONTINUE, "continue", HITRATE (67), 0) @@ -151,7 +151,7 @@ DEF_PREDICTOR (PRED_LOOP_IV_COMPARE_GUESS, "guess loop iv compare", /* 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, +DEF_PREDICTOR (PRED_LOOP_IV_COMPARE, "loop iv compare", PROB_UNINITIALIZED, PRED_FLAG_FIRST_MATCH) /* In the following code |