MIPS backend had some information about INSN, including length,
count etc.
And since some instructions are more costly, let's add a new
attr `perf_ratio`. It's default value is (const_int 1).
The return value of mips_insn_cost is
insn_count * perf_ratio * 4.
The magic `4` here, is due to that `rtx_cost` returns 4
for simple instructions.
gcc
* config/mips/mips.cc (mips_insn_cost): New function.
TARGET_INSN_COST: defined to mips_insn_cost.
* config/mips/mips.md (perf_ratio): New attr.
---
gcc/config/mips/mips.cc | 14 ++++++++++++++
gcc/config/mips/mips.md | 4 ++++
2 files changed, 18 insertions(+)
diff --git a/gcc/config/mips/mips.cc b/gcc/config/mips/mips.cc
index 9180dbbf843..fddb1519d76 100644
--- a/gcc/config/mips/mips.cc
+++ b/gcc/config/mips/mips.cc
@@ -4170,6 +4170,18 @@ mips_set_reg_reg_cost (machine_mode mode)
}
}
+/* Implement TARGET_INSN_COSTS. */
+
+static int
+mips_insn_cost (rtx_insn *x, bool speed ATTRIBUTE_UNUSED)
+{
+ if (GET_CODE (PATTERN (x)) != SET)
+ return pattern_cost (PATTERN (x), speed);
+ return get_attr_insn_count (x)
+ * get_attr_perf_ratio (x)
+ * 4;
+}
+
/* Implement TARGET_RTX_COSTS. */
static bool
@@ -23069,6 +23081,8 @@ mips_bit_clear_p (enum machine_mode mode, unsigned
HOST_WIDE_INT m)
#define TARGET_RTX_COSTS mips_rtx_costs
#undef TARGET_ADDRESS_COST
#define TARGET_ADDRESS_COST mips_address_cost
+#undef TARGET_INSN_COST
+#define TARGET_INSN_COST mips_insn_cost
#undef TARGET_NO_SPECULATION_IN_DELAY_SLOTS_P
#define TARGET_NO_SPECULATION_IN_DELAY_SLOTS_P
mips_no_speculation_in_delay_slots_p
diff --git a/gcc/config/mips/mips.md b/gcc/config/mips/mips.md
index 0666310734e..d6c4ba13f47 100644
--- a/gcc/config/mips/mips.md
+++ b/gcc/config/mips/mips.md
@@ -312,6 +312,10 @@ (define_attr "sync_insn2" "nop,and,xor,not"
;; "11" specifies MEMMODEL_ACQUIRE.
(define_attr "sync_memmodel" "" (const_int 10))
+;; Performance ratio. Used by mips_insn_cost: it returns
insn_count*perf_ratio*4.
+;; Add this attr to the slow INSNs.
+(define_attr "perf_ratio" "" (const_int 1))
+
;; Accumulator operand for madd patterns.
(define_attr "accum_in" "none,0,1,2,3,4,5" (const_string "none"))
--
2.39.2
