--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/clang/test/CodeGen/fp-atomic-ops.c	Tue Jun 08 06:07:14 2021 +0900
@@ -0,0 +1,44 @@
+// RUN: %clang_cc1 %s -emit-llvm -DDOUBLE -O0 -o - -triple=amdgcn-amd-amdhsa \
+// RUN:   | opt -instnamer -S | FileCheck -check-prefixes=FLOAT,DOUBLE %s
+
+// RUN: %clang_cc1 %s -emit-llvm -DDOUBLE -O0 -o - -triple=aarch64-linux-gnu \
+// RUN:   | opt -instnamer -S | FileCheck -check-prefixes=FLOAT,DOUBLE %s
+
+// RUN: %clang_cc1 %s -emit-llvm -O0 -o - -triple=armv8-apple-ios7.0 \
+// RUN:   | opt -instnamer -S | FileCheck -check-prefixes=FLOAT %s
+
+// RUN: %clang_cc1 %s -emit-llvm -DDOUBLE -O0 -o - -triple=hexagon \
+// RUN:   | opt -instnamer -S | FileCheck -check-prefixes=FLOAT,DOUBLE %s
+
+// RUN: %clang_cc1 %s -emit-llvm -DDOUBLE -O0 -o - -triple=mips64-mti-linux-gnu \
+// RUN:   | opt -instnamer -S | FileCheck -check-prefixes=FLOAT,DOUBLE %s
+
+// RUN: %clang_cc1 %s -emit-llvm -O0 -o - -triple=i686-linux-gnu \
+// RUN:   | opt -instnamer -S | FileCheck -check-prefixes=FLOAT %s
+
+// RUN: %clang_cc1 %s -emit-llvm -DDOUBLE -O0 -o - -triple=x86_64-linux-gnu \
+// RUN:   | opt -instnamer -S | FileCheck -check-prefixes=FLOAT,DOUBLE %s
+
+typedef enum memory_order {
+  memory_order_relaxed = __ATOMIC_RELAXED,
+  memory_order_acquire = __ATOMIC_ACQUIRE,
+  memory_order_release = __ATOMIC_RELEASE,
+  memory_order_acq_rel = __ATOMIC_ACQ_REL,
+  memory_order_seq_cst = __ATOMIC_SEQ_CST
+} memory_order;
+
+void test(float *f, float ff, double *d, double dd) {
+  // FLOAT: atomicrmw fadd float* {{.*}} monotonic
+  __atomic_fetch_add(f, ff, memory_order_relaxed);
+
+  // FLOAT: atomicrmw fsub float* {{.*}} monotonic
+  __atomic_fetch_sub(f, ff, memory_order_relaxed);
+
+#ifdef DOUBLE
+  // DOUBLE: atomicrmw fadd double* {{.*}} monotonic
+  __atomic_fetch_add(d, dd, memory_order_relaxed);
+
+  // DOUBLE: atomicrmw fsub double* {{.*}} monotonic
+  __atomic_fetch_sub(d, dd, memory_order_relaxed);
+#endif
+}