diff options
Diffstat (limited to 'gcc/expmed.c')
| -rw-r--r-- | gcc/expmed.c | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/gcc/expmed.c b/gcc/expmed.c index 1cedf023c8e..2f789a2f075 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -127,10 +127,10 @@ init_expmed_one_conv (struct init_expmed_rtl *all, machine_mode to_mode, comparison purposes here, reduce the bit size by one in that case. */ if (GET_MODE_CLASS (to_mode) == MODE_PARTIAL_INT - && exact_log2 (to_size) != -1) + && pow2p_hwi (to_size)) to_size --; if (GET_MODE_CLASS (from_mode) == MODE_PARTIAL_INT - && exact_log2 (from_size) != -1) + && pow2p_hwi (from_size)) from_size --; /* Assume cost of zero-extend and sign-extend is the same. */ @@ -2572,7 +2572,6 @@ synth_mult (struct algorithm *alg_out, unsigned HOST_WIDE_INT t, entry_ptr = alg_hash_entry_ptr (hash_index); if (entry_ptr->t == t && entry_ptr->mode == mode - && entry_ptr->mode == mode && entry_ptr->speed == speed && entry_ptr->alg != alg_unknown) { @@ -2636,7 +2635,7 @@ synth_mult (struct algorithm *alg_out, unsigned HOST_WIDE_INT t, if ((t & 1) == 0) { do_alg_shift: - m = floor_log2 (t & -t); /* m = number of low zero bits */ + m = ctz_or_zero (t); /* m = number of low zero bits */ if (m < maxm) { q = t >> m; @@ -2873,9 +2872,8 @@ synth_mult (struct algorithm *alg_out, unsigned HOST_WIDE_INT t, { do_alg_add_t2_m: q = t - 1; - q = q & -q; - m = exact_log2 (q); - if (m >= 0 && m < maxm) + m = ctz_hwi (q); + if (q && m < maxm) { op_cost = shiftadd_cost (speed, mode, m); new_limit.cost = best_cost.cost - op_cost; @@ -2897,9 +2895,8 @@ synth_mult (struct algorithm *alg_out, unsigned HOST_WIDE_INT t, do_alg_sub_t2_m: q = t + 1; - q = q & -q; - m = exact_log2 (q); - if (m >= 0 && m < maxm) + m = ctz_hwi (q); + if (q && m < maxm) { op_cost = shiftsub0_cost (speed, mode, m); new_limit.cost = best_cost.cost - op_cost; @@ -4215,7 +4212,7 @@ expand_divmod (int rem_flag, enum tree_code code, machine_mode mode, initial right shift. */ if (mh != 0 && (d & 1) == 0) { - pre_shift = floor_log2 (d & -d); + pre_shift = ctz_or_zero (d); mh = choose_multiplier (d >> pre_shift, size, size - pre_shift, &ml, &post_shift, &dummy); @@ -4873,7 +4870,7 @@ expand_divmod (int rem_flag, enum tree_code code, machine_mode mode, int pre_shift; rtx t1; - pre_shift = floor_log2 (d & -d); + pre_shift = ctz_or_zero (d); ml = invert_mod2n (d >> pre_shift, size); t1 = expand_shift (RSHIFT_EXPR, compute_mode, op0, pre_shift, NULL_RTX, unsignedp); |