diff options
Diffstat (limited to 'gcc/jump.c')
| -rw-r--r-- | gcc/jump.c | 26 |
1 files changed, 19 insertions, 7 deletions
@@ -67,6 +67,7 @@ Boston, MA 02111-1307, USA. */ #include "except.h" #include "toplev.h" #include "reload.h" +#include "predict.h" /* ??? Eventually must record somehow the labels used by jumps from nested functions. */ @@ -1248,6 +1249,23 @@ duplicate_loop_exit_test (loop_start) replace_regs (REG_NOTES (copy), reg_map, max_reg, 1); } + /* Predict conditional jump that do make loop looping as taken. + Other jumps are probably exit conditions, so predict + them as untaken. */ + if (any_condjump_p (copy)) + { + rtx label = JUMP_LABEL (copy); + if (label) + { + if (PREV_INSN (label) + && GET_CODE (PREV_INSN (label)) == NOTE + && (NOTE_LINE_NUMBER (PREV_INSN (label)) + == NOTE_INSN_LOOP_CONT)) + predict_insn_def (copy, PRED_LOOP_HEADER, TAKEN); + else + predict_insn_def (copy, PRED_LOOP_HEADER, NOT_TAKEN); + } + } /* If this is a simple jump, add it to the jump chain. */ if (INSN_UID (copy) < max_jump_chain && JUMP_LABEL (copy) @@ -3351,13 +3369,7 @@ invert_jump (jump, nlabel, delete_unused) if (redirect_jump (jump, nlabel, delete_unused)) { - /* An inverted jump means that a probability taken becomes a - probability not taken. Subtract the branch probability from the - probability base to convert it back to a taken probability. */ - - rtx note = find_reg_note (jump, REG_BR_PROB, NULL_RTX); - if (note) - XEXP (note, 0) = GEN_INT (REG_BR_PROB_BASE - INTVAL (XEXP (note, 0))); + invert_br_probabilities (jump); return 1; } |