LoongArch: Don't use "+" for atomic_{load, store} "m" constraint

Atomic load does not modify the memory.  Atomic store does not read the
memory, thus we can use "=" instead.

gcc/ChangeLog:

	* config/loongarch/sync.md (atomic_load<mode>): Remove "+" for
	the memory operand.
	(atomic_store<mode>): Use "=" instead of "+" for the memory
	operand.

diff --git a/gcc/config/loongarch/sync.md b/gcc/config/loongarch/sync.md
index f712c2fe07e226982b474a0f171f71cb1dc87234..63929abba457e2bc19dd5d8aaf783961b46ff629 100644 (file)
--- a/gcc/config/loongarch/sync.md
+++ b/gcc/config/loongarch/sync.md
@@ -102,7 +102,7 @@
 (define_insn "atomic_load<mode>"
   [(set (match_operand:QHWD 0 "register_operand" "=r")
     (unspec_volatile:QHWD
-      [(match_operand:QHWD 1 "memory_operand" "+m")
+      [(match_operand:QHWD 1 "memory_operand" "m")
        (match_operand:SI 2 "const_int_operand")]                        ;; model
       UNSPEC_ATOMIC_LOAD))]
   ""
@@ -139,7 +139,7 @@
 
 ;; Implement atomic stores with amoswap.  Fall back to fences for atomic loads.
 (define_insn "atomic_store<mode>"
-  [(set (match_operand:QHWD 0 "memory_operand" "+m")
+  [(set (match_operand:QHWD 0 "memory_operand" "=m")
     (unspec_volatile:QHWD
       [(match_operand:QHWD 1 "reg_or_0_operand" "rJ")
        (match_operand:SI 2 "const_int_operand")]      ;; model