@@ -1597,6 +1597,9 @@ ARM target supports executing ARMv8.1 Adv.SIMD instructions. Some
multilibs may be incompatible with the options needed. Implies
arm_v8_1a_neon_ok.
+@item arm_acq_rel
+ARM target supports acquire-release instructions.
+
@item arm_prefer_ldrd_strd
ARM target prefers @code{LDRD} and @code{STRD} instructions over
@code{LDM} and @code{STM} instructions.
@@ -3528,6 +3528,25 @@ proc check_effective_target_arm_neonv2 { } {
}
}
+# Return 1 if this is an ARM target with load acquire and store release for
+# 8-, 16- and 32-byte types.
+
s/store release/store release instructions/
s/byte/bit/.
+proc check_effective_target_arm_acq_rel { } {
+ return [check_no_compiler_messages arm_acq_rel object {
+ void
+ load_acquire_store_release (void)
+ {
+ asm ("lda r0, [r1]\n\t"
+ "stl r0, [r1]\n\t"
+ "ldah r0, [r1]\n\t"
+ "stlh r0, [r1]\n\t"
+ "ldab r0, [r1]\n\t"
+ "stlb r0, [r1]"
+ : : : "r0", "memory");