diff mbox series

[committed] MIPS: define_attr perf_ratio in mips.md

Message ID 20240104015819.353901-1-syq@gcc.gnu.org
State New
Headers show
Series [committed] MIPS: define_attr perf_ratio in mips.md | expand

Commit Message

YunQiang Su Jan. 4, 2024, 1:58 a.m. UTC 
The accurate cost of an pattern can get with
	 insn_count * perf_ratio

The default value is set to 0 instead of 1, since that
we will need to distinguish the default value and it is
really set for an pattern.  Since it is not set for most
patterns yet, to use it, we will need to be sure that it's
value is greater than 0.

This attr will be used in `mips_insn_cost`.

gcc

	* config/mips/mips.md (perf_ratio): New attribute.
---
 gcc/config/mips/mips.md | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/gcc/config/mips/mips.md b/gcc/config/mips/mips.md
index 6d47241ea3a..e1762ce105b 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.  Add this attr to the slow INSNs.
+;; Used by mips_insn_cost.
+(define_attr "perf_ratio" "" (const_int 0))
+
 ;; Accumulator operand for madd patterns.
 (define_attr "accum_in" "none,0,1,2,3,4,5" (const_string "none"))