diff options
| -rw-r--r-- | gcc/ChangeLog | 4 | ||||
| -rw-r--r-- | gcc/config/aarch64/aarch64.c | 11 |
2 files changed, 10 insertions, 5 deletions
diff --git a/gcc/ChangeLog b/gcc/ChangeLog index 16db0ab..6945af9 100644 --- a/gcc/ChangeLog +++ b/gcc/ChangeLog @@ -1,3 +1,7 @@ +2016-07-28 Kristina Martsenko <kristina.martsenko@arm.com> + + * config/aarch64/aarch64.c (aarch64_rtx_costs): Fix cost of zero extend. + 2016-07-28 Wilco Dijkstra <wdijkstr@arm.com> * config/aarch64/aarch64.c (aarch64_pushwb_pair_reg): Rename. diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c index d456670..e91811d 100644 --- a/gcc/config/aarch64/aarch64.c +++ b/gcc/config/aarch64/aarch64.c @@ -6803,11 +6803,12 @@ cost_plus: { int op_cost = rtx_cost (op0, VOIDmode, ZERO_EXTEND, 0, speed); - if (!op_cost && speed) - /* MOV. */ - *cost += extra_cost->alu.extend; - else - /* Free, the cost is that of the SI mode operation. */ + /* If OP_COST is non-zero, then the cost of the zero extend + is effectively the cost of the inner operation. Otherwise + we have a MOV instruction and we take the cost from the MOV + itself. This is true independently of whether we are + optimizing for space or time. */ + if (op_cost) *cost = op_cost; return true; |