diff options
| -rw-r--r-- | gcc/ChangeLog | 5 | ||||
| -rw-r--r-- | gcc/expmed.c | 4 |
2 files changed, 7 insertions, 2 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index b615c1f..d269b76 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,8 @@ +2015-03-23 Kyrylo Tkachov <kyrylo.tkachov@arm.com> + + * expmed.c (synth_mult): Fix comment about multiplying by T-1 and + adding T or multiplying by T+1 and subracting T. + 2015-03-22 Jeff Law <law@redhat.com> PR rtl-optimization/64317 diff --git a/gcc/expmed.c b/gcc/expmed.c index 8d4f964..e0b2619 100644 --- a/gcc/expmed.c +++ b/gcc/expmed.c @@ -2611,7 +2611,7 @@ synth_mult (struct algorithm *alg_out, unsigned HOST_WIDE_INT t, Thus we prefer addition in that case. */ && t != 3)) { - /* T ends with ...111. Multiply by (T + 1) and subtract 1. */ + /* T ends with ...111. Multiply by (T + 1) and subtract T. */ op_cost = add_cost (speed, mode); new_limit.cost = best_cost.cost - op_cost; @@ -2630,7 +2630,7 @@ synth_mult (struct algorithm *alg_out, unsigned HOST_WIDE_INT t, } else { - /* T ends with ...01 or ...011. Multiply by (T - 1) and add 1. */ + /* T ends with ...01 or ...011. Multiply by (T - 1) and add T. */ op_cost = add_cost (speed, mode); new_limit.cost = best_cost.cost - op_cost; |