gcc/ChangeLog:
* config/loongarch/sync.md:
Add atomic_cas_value_exchange_and_7<mode> and fix atomic_exchange<mode>.
gcc/testsuite/ChangeLog:
* gcc.target/loongarch/sync-1.c: New test.
---
gcc/config/loongarch/sync.md | 27 ++++-
gcc/testsuite/gcc.target/loongarch/sync-1.c | 104 ++++++++++++++++++++
2 files changed, 129 insertions(+), 2 deletions(-)
create mode 100644 gcc/testsuite/gcc.target/loongarch/sync-1.c
diff --git a/gcc/config/loongarch/sync.md b/gcc/config/loongarch/sync.md
index 0c4f1983e..8a8e6247b 100644
--- a/gcc/config/loongarch/sync.md
+++ b/gcc/config/loongarch/sync.md
@@ -448,6 +448,29 @@
}
[(set (attr "length") (const_int 32))])
+(define_insn "atomic_cas_value_exchange_and_7_<mode>"
+ [(set (match_operand:GPR 0 "register_operand" "=&r")
+ (match_operand:GPR 1 "memory_operand" "+ZC"))
+ (set (match_dup 1)
+ (unspec_volatile:GPR [(match_operand:GPR 2 "reg_or_0_operand" "rJ")
+ (match_operand:GPR 3 "reg_or_0_operand" "rJ")
+ (match_operand:GPR 4 "reg_or_0_operand" "rJ")
+ (match_operand:GPR 5 "reg_or_0_operand" "rJ")
+ (match_operand:SI 6 "const_int_operand")] ;; model
+ UNSPEC_SYNC_EXCHANGE))
+ (clobber (match_scratch:GPR 7 "=&r"))]
+ ""
+{
+ return "%G6\\n\\t"
+ "1:\\n\\t"
+ "ll.<amo>\\t%0,%1\\n\\t"
+ "and\\t%7,%0,%z3\\n\\t"
+ "or%i5\\t%7,%7,%5\\n\\t"
+ "sc.<amo>\\t%7,%1\\n\\t"
+ "beqz\\t%7,1b\\n\\t";
+}
+ [(set (attr "length") (const_int 20))])
+
(define_expand "atomic_exchange<mode>"
[(set (match_operand:SHORT 0 "register_operand")
(unspec_volatile:SHORT
@@ -459,9 +482,9 @@
""
{
union loongarch_gen_fn_ptrs generator;
- generator.fn_7 = gen_atomic_cas_value_cmp_and_7_si;
+ generator.fn_7 = gen_atomic_cas_value_exchange_and_7_si;
loongarch_expand_atomic_qihi (generator, operands[0], operands[1],
- operands[1], operands[2], operands[3]);
+ const0_rtx, operands[2], operands[3]);
DONE;
})
diff --git a/gcc/testsuite/gcc.target/loongarch/sync-1.c
b/gcc/testsuite/gcc.target/loongarch/sync-1.c
new file mode 100644
index 000000000..cebed6a9b
--- /dev/null
+++ b/gcc/testsuite/gcc.target/loongarch/sync-1.c
@@ -0,0 +1,104 @@
+/* Test __sync_test_and_set in atomic_exchange */
+/* { dg-do run } */
+/* { dg-options "-lpthread -std=c11" } */
+
+#include <pthread.h>
+#include <sched.h>
+#include <stdatomic.h>
+#include <stdlib.h>
+
+#define NR_THREAD 16
+#define NR_DATA 1000
+#define ITER_COUNT 10000
+
+static int _data[NR_DATA];
+static char _lock;
+static int _overcnt;
+
+static inline void proc_yield(int cnt)
+{
+ __asm__ __volatile__("":::"memory");
+}
+
+static void unlock()
+{
+ return atomic_store_explicit(&_lock, 0, memory_order_seq_cst);
+}
+
+static int trylock()
+{
+ return atomic_exchange_explicit(&_lock, 1, memory_order_acquire) == 0;
+}
+
+static void lockslow()
+{
+ for (int i = 0;; i++) {
+ if (i < 10)
+ proc_yield(i);
+ else
+ sched_yield();
+ if (atomic_load_explicit(&_lock, memory_order_relaxed) == 0
+ && atomic_exchange_explicit(&_lock, 1, memory_order_acquire) == 0)
+ return;
+ }
+}
+
+static void lock()
+{
+ if (trylock())
+ return;
+ lockslow();
+}
+
+static void checkeq(int a, int b)
+{
+ if (a != b)
+ __builtin_abort();
+}
+
+static void adddata()
+{
+ int i, v;
+ lock();
+ v = _data[0];
+ for (i = 0; i < NR_DATA; i++) {
+ checkeq(_data[i], v);
+ _data[i]++;
+ }
+ unlock();
+}
+
+static void backoff()
+{
+ int i, data[NR_DATA] = {0};
+ for (i = 0; i < NR_DATA; i++) {
+ data[i]++;
+ checkeq(data[i], 1);
+ }
+}
+
+static void *write_mutex_thread(void *unused)
+{
+ int i;
+ for (i = 0; i < ITER_COUNT; i++) {
+ adddata();
+ backoff();
+ }
+ atomic_fetch_add(&_overcnt, 1);
+}
+
+int main()
+{
+ int cnt;
+
+ pthread_t threads[NR_THREAD];
+ for (int i = 0; i < NR_THREAD; i++)
+ pthread_create(&threads[i], 0, write_mutex_thread, NULL);
+ for (int i = 0; i < NR_THREAD; i++)
+ pthread_detach(threads[i]);
+ while(cnt != NR_THREAD) {
+ sched_yield();
+ cnt = atomic_load(&_overcnt);
+ }
+ return 0;
+}
--
2.34.3
