diff options
Diffstat (limited to 'gcc/reg-notes.def')
| -rw-r--r-- | gcc/reg-notes.def | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/gcc/reg-notes.def b/gcc/reg-notes.def index 8734d26e5b4..943eff41d30 100644 --- a/gcc/reg-notes.def +++ b/gcc/reg-notes.def @@ -99,20 +99,21 @@ REG_NOTE (DEP_OUTPUT) REG_NOTE (DEP_ANTI) REG_NOTE (DEP_CONTROL) -/* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs. It has an +/* REG_BR_PROB is attached to JUMP_INSNs. It has an integer value (in an INT_LIST). For jumps, it is the probability - that this is a taken branch. For calls, it is the probability that - this call won't return. */ + that this is a taken branch. The integer represents a value of + profile_probability type. Use to_reg_br_prob_note and from_reg_br_prob_note + to extract the actual value. */ REG_NOTE (BR_PROB) /* Attached to a call insn; indicates that the call is malloc-like and that the pointer returned cannot alias anything else. */ REG_NOTE (NOALIAS) -/* REG_BR_PRED is attached to JUMP_INSNs and CALL_INSNSs. It contains +/* REG_BR_PRED is attached to JUMP_INSNs. It contains CONCAT of two integer value. First specifies the branch predictor that added the note, second specifies the predicted hitrate of - branch in the same format as REG_BR_PROB note uses. */ + branch in a fixed point arithmetic based on REG_BR_PROB_BASE. */ REG_NOTE (BR_PRED) /* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex |