diff options
Diffstat (limited to 'gcc/modulo-sched.c')
| -rw-r--r-- | gcc/modulo-sched.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/gcc/modulo-sched.c b/gcc/modulo-sched.c index 3352e20..93f5b9a 100644 --- a/gcc/modulo-sched.c +++ b/gcc/modulo-sched.c @@ -868,6 +868,10 @@ canon_loop (struct loop *loop) } } +/* Probability in % that the sms-ed loop rolls enough so that optimized + version may be entered. Just a guess. */ +#define PROB_SMS_ENOUGH_ITERATIONS 80 + /* Main entry point, perform SMS scheduling on the loops of the function that consist of single basic blocks. */ static void @@ -882,7 +886,7 @@ sms_schedule (void) partial_schedule_ptr ps; struct df *df; basic_block bb = NULL; - struct loop *loop, *nloop; + struct loop *loop; basic_block condition_bb = NULL; edge latch_edge; gcov_type trip_count = 0; @@ -1181,8 +1185,12 @@ sms_schedule (void) { rtx comp_rtx = gen_rtx_fmt_ee (GT, VOIDmode, count_reg, GEN_INT(stage_count)); + unsigned prob = (PROB_SMS_ENOUGH_ITERATIONS + * REG_BR_PROB_BASE) / 100; - nloop = loop_version (loop, comp_rtx, &condition_bb, true); + loop_version (loop, comp_rtx, &condition_bb, + prob, prob, REG_BR_PROB_BASE - prob, + true); } /* Set new iteration count of loop kernel. */ |