Improve costing of ctz - both TARGET_CSSC and vector cases were not handled yet.
Passes regress & bootstrap - OK for commit?
gcc:
* config/aarch64/aarch64.cc (aarch64_rtx_costs): Improve CTZ costing.
---
diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index
fe13c9a0d4863041eb9101882ea57c2094240d16..2a6f76f4008839bf0aa158504430af9b7777971c
100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -14309,10 +14309,24 @@ aarch64_rtx_costs (rtx x, machine_mode mode, int
outer ATTRIBUTE_UNUSED,
return false;
case CTZ:
- *cost = COSTS_N_INSNS (2);
-
- if (speed)
- *cost += extra_cost->alu.clz + extra_cost->alu.rev;
+ if (VECTOR_MODE_P (mode))
+ {
+ *cost = COSTS_N_INSNS (3);
+ if (speed)
+ *cost += extra_cost->vect.alu * 3;
+ }
+ else if (TARGET_CSSC)
+ {
+ *cost = COSTS_N_INSNS (1);
+ if (speed)
+ *cost += extra_cost->alu.clz;
+ }
+ else
+ {
+ *cost = COSTS_N_INSNS (2);
+ if (speed)
+ *cost += extra_cost->alu.clz + extra_cost->alu.rev;
+ }
return false;
case COMPARE:
