diff options
Diffstat (limited to 'lib/hipe/x86/hipe_x86_cfg.erl')
| -rw-r--r-- | lib/hipe/x86/hipe_x86_cfg.erl | 22 |
1 files changed, 21 insertions, 1 deletions
diff --git a/lib/hipe/x86/hipe_x86_cfg.erl b/lib/hipe/x86/hipe_x86_cfg.erl index a4544e1086..0a3c0fc9d6 100644 --- a/lib/hipe/x86/hipe_x86_cfg.erl +++ b/lib/hipe/x86/hipe_x86_cfg.erl @@ -19,7 +19,7 @@ succ/2, pred/2, bb/2, bb_add/3, map_bbs/2, fold_bbs/3]). -export([postorder/1, reverse_postorder/1]). --export([linearise/1, params/1, arity/1, redirect_jmp/3]). +-export([linearise/1, params/1, arity/1, redirect_jmp/3, branch_preds/1]). %%% these tell cfg.inc what to define (ugly as hell) -define(PRED_NEEDED,true). @@ -72,6 +72,26 @@ branch_successors(Branch) -> #ret{} -> [] end. +branch_preds(Branch) -> + case Branch of + #jmp_switch{labels=Labels} -> + Prob = 1.0/length(Labels), + [{L, Prob} || L <- Labels]; + #pseudo_call{contlab=ContLab, sdesc=#x86_sdesc{exnlab=[]}} -> + %% A function can still cause an exception, even if we won't catch it + [{ContLab, 1.0-hipe_bb_weights:call_exn_pred()}]; + #pseudo_call{contlab=ContLab, sdesc=#x86_sdesc{exnlab=ExnLab}} -> + CallExnPred = hipe_bb_weights:call_exn_pred(), + [{ContLab, 1.0-CallExnPred}, {ExnLab, CallExnPred}]; + #pseudo_jcc{true_label=TrueLab,false_label=FalseLab,pred=Pred} -> + [{FalseLab, 1.0-Pred}, {TrueLab, Pred}]; + _ -> + case branch_successors(Branch) of + [] -> []; + [Single] -> [{Single, 1.0}] + end + end. + -ifdef(REMOVE_TRIVIAL_BBS_NEEDED). fails_to(_Instr) -> []. -endif. |