@@ -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.
@@ -3494,6 +3494,25 @@ proc check_effective_target_arm_neonv2 { } {
}
}
+# Return 1 if this is an ARM target with load acquire and store release
+# instructions for 8-, 16- and 32-bit types.
+
+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");
+ }
+ }]
+}
+
# Return 1 if this a Loongson-2E or -2F target using an ABI that supports
# the Loongson vector modes.
@@ -5725,6 +5744,8 @@ proc check_effective_target_sync_int_long { } {
|| [istarget aarch64*-*-*]
|| [istarget alpha*-*-*]
|| [istarget arm*-*-linux-*]
+ || ([istarget arm*-*-*]
+ && [check_effective_target_arm_acq_rel])
|| [istarget bfin*-*linux*]
|| [istarget hppa*-*linux*]
|| [istarget s390*-*-*]
@@ -5758,6 +5779,8 @@ proc check_effective_target_sync_char_short { } {
|| [istarget i?86-*-*] || [istarget x86_64-*-*]
|| [istarget alpha*-*-*]
|| [istarget arm*-*-linux-*]
+ || ([istarget arm*-*-*]
+ && [check_effective_target_arm_acq_rel])
|| [istarget hppa*-*linux*]
|| [istarget s390*-*-*]
|| [istarget powerpc*-*-*]