This backport contains 1 patch from gcc main stream tree.
The commit id of these patchs list as following in the order of time.

AArch64-Fix-cost-of-plus-.-const_int-C.patch:
commit 835d50c66aa5bde2f354a6e63a2afa7d2f76a05a

diff --git a/gcc/config/aarch64/aarch64.c b/gcc/config/aarch64/aarch64.c
index 56a4a47db73..71d44de1d0a 100644
--- a/gcc/config/aarch64/aarch64.c
+++ b/gcc/config/aarch64/aarch64.c
@@ -10753,7 +10753,7 @@ cost_plus:
 	  }
 
 	if (GET_MODE_CLASS (mode) == MODE_INT
-	    && ((CONST_INT_P (op1) && aarch64_uimm12_shift (INTVAL (op1)))
+	    && (aarch64_plus_immediate (op1, mode)
 		|| aarch64_sve_addvl_addpl_immediate (op1, mode)))
 	  {
 	    *cost += rtx_cost (op0, mode, PLUS, 0, speed);