diff options
Diffstat (limited to 'gcc/predict.c')
| -rw-r--r-- | gcc/predict.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/gcc/predict.c b/gcc/predict.c index 7ed470929af..57b71e2d9c2 100644 --- a/gcc/predict.c +++ b/gcc/predict.c @@ -248,9 +248,19 @@ expected_value_to_br_prob () } /* Collect the branch condition, hopefully relative to EV_REG. */ + /* ??? At present we'll miss things like + (expected_value (eq r70 0)) + (set r71 -1) + (set r80 (lt r70 r71)) + (set pc (if_then_else (ne r80 0) ...)) + as canonicalize_condition will render this to us as + (lt r70, r71) + Could use cselib to try and reduce this further. */ cond = XEXP (SET_SRC (PATTERN (insn)), 0); cond = canonicalize_condition (insn, cond, 0, NULL, ev_reg); - if (! cond || XEXP (cond, 0) != ev_reg) + if (! cond + || XEXP (cond, 0) != ev_reg + || GET_CODE (XEXP (cond, 1)) != CONST_INT) continue; /* Substitute and simplify. Given that the expression we're |