From a6c383b0d8a2819e3cfaa7ea900e9244acacb666 Mon Sep 17 00:00:00 2001 From: Doug Evans Date: Fri, 28 Mar 1997 22:38:24 +0000 Subject: [PATCH] reorg.c (mostly_true_jump): Use REG_BR_PROB notes when flag_branch_probabilities. * reorg.c (mostly_true_jump): Use REG_BR_PROB notes when flag_branch_probabilities. From-SVN: r13819 --- gcc/reorg.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/gcc/reorg.c b/gcc/reorg.c index 8f08afb054b..8cd44731a5e 100644 --- a/gcc/reorg.c +++ b/gcc/reorg.c @@ -1350,6 +1350,26 @@ mostly_true_jump (jump_insn, condition) int rare_dest = rare_destination (target_label); int rare_fallthrough = rare_destination (NEXT_INSN (jump_insn)); + /* If branch probabilities are available, then use that number since it + always gives a correct answer. */ + if (flag_branch_probabilities) + { + rtx note = find_reg_note (jump_insn, REG_BR_PROB, 0);; + if (note) + { + int prob = XINT (note, 0); + + if (prob >= REG_BR_PROB_BASE * 9 / 10) + return 2; + else if (prob >= REG_BR_PROB_BASE / 2) + return 1; + else if (prob >= REG_BR_PROB_BASE / 10) + return 0; + else + return -1; + } + } + /* If this is a branch outside a loop, it is highly unlikely. */ if (GET_CODE (PATTERN (jump_insn)) == SET && GET_CODE (SET_SRC (PATTERN (jump_insn))) == IF_THEN_ELSE -- 2.30.2