This is a pretty minimalistic implementation of the insn_cost hook: it
just counts how many machine instructions will be generated. Some
improvements are needed: loads should get extra cost; some instructions
like mul and div should be more expensive than others; and it exposes
some suboptimalities in our machine description files. Still, good
enough for most testing.
---
gcc/config/rs6000/rs6000.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/gcc/config/rs6000/rs6000.c b/gcc/config/rs6000/rs6000.c
index a7d2e7e..b4fda69 100644
--- a/gcc/config/rs6000/rs6000.c
+++ b/gcc/config/rs6000/rs6000.c
@@ -1761,6 +1761,8 @@ static const struct attribute_spec
rs6000_attribute_table[] =
#define TARGET_RTX_COSTS rs6000_rtx_costs
#undef TARGET_ADDRESS_COST
#define TARGET_ADDRESS_COST hook_int_rtx_mode_as_bool_0
+#undef TARGET_INSN_COST
+#define TARGET_INSN_COST rs6000_insn_cost
#undef TARGET_INIT_DWARF_REG_SIZES_EXTRA
#define TARGET_INIT_DWARF_REG_SIZES_EXTRA rs6000_init_dwarf_reg_sizes_extra
@@ -34521,6 +34523,18 @@ rs6000_debug_rtx_costs (rtx x, machine_mode mode, int
outer_code,
return ret;
}
+static int
+rs6000_insn_cost (rtx_insn *insn, bool speed)
+{
+ if (recog_memoized (insn) < 0)
+ return 0;
+
+ if (!speed)
+ return get_attr_length (insn);
+
+ return COSTS_N_INSNS (get_attr_length (insn) / 4);
+}
+
/* Debug form of ADDRESS_COST that is selected if -mdebug=cost. */
static int
--
1.9.3
