diff --git a/clang/include/clang/Basic/arm_neon.td b/clang/include/clang/Basic/arm_neon.td
--- a/clang/include/clang/Basic/arm_neon.td
+++ b/clang/include/clang/Basic/arm_neon.td
@@ -1889,7 +1889,7 @@
 }
 
 // v8.2-A FP16 fused multiply-add long instructions.
-let ArchGuard = "defined(__ARM_FEATURE_FP16FML) && defined(__aarch64__)" in {
+let ArchGuard = "defined(__ARM_FEATURE_FP16_FML) && defined(__aarch64__)" in {
   def VFMLAL_LOW  : SInst<"vfmlal_low",  ">>..", "hQh">;
   def VFMLSL_LOW  : SInst<"vfmlsl_low",  ">>..", "hQh">;
   def VFMLAL_HIGH : SInst<"vfmlal_high", ">>..", "hQh">;
diff --git a/clang/lib/Basic/Targets/AArch64.cpp b/clang/lib/Basic/Targets/AArch64.cpp
--- a/clang/lib/Basic/Targets/AArch64.cpp
+++ b/clang/lib/Basic/Targets/AArch64.cpp
@@ -352,7 +352,7 @@
     Builder.defineMacro("__ARM_FEATURE_SVE_MATMUL_INT8", "1");
 
   if ((FPU & NeonMode) && HasFP16FML)
-    Builder.defineMacro("__ARM_FEATURE_FP16FML", "1");
+    Builder.defineMacro("__ARM_FEATURE_FP16_FML", "1");
 
   if (Opts.hasSignReturnAddress()) {
     // Bitmask:
diff --git a/clang/test/Preprocessor/aarch64-target-features.c b/clang/test/Preprocessor/aarch64-target-features.c
--- a/clang/test/Preprocessor/aarch64-target-features.c
+++ b/clang/test/Preprocessor/aarch64-target-features.c
@@ -207,8 +207,8 @@
 // RUN: %clang -target aarch64-none-linux-gnueabi -march=armv8.4-a+fp16+nofp16fml -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-FULLFP16-NOFML --check-prefix=CHECK-FULLFP16-VECTOR-SCALAR %s
 // RUN: %clang -target aarch64-none-linux-gnueabi -march=armv8.4-a+fp16fml -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-FULLFP16-FML --check-prefix=CHECK-FULLFP16-VECTOR-SCALAR %s
 // RUN: %clang -target aarch64-none-linux-gnueabi -march=armv8.4-a+fp16 -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-FULLFP16-FML --check-prefix=CHECK-FULLFP16-VECTOR-SCALAR %s
-// CHECK-FULLFP16-FML:           #define __ARM_FEATURE_FP16FML 1
-// CHECK-FULLFP16-NOFML-NOT:     #define __ARM_FEATURE_FP16FML 1
+// CHECK-FULLFP16-FML:           #define __ARM_FEATURE_FP16_FML 1
+// CHECK-FULLFP16-NOFML-NOT:     #define __ARM_FEATURE_FP16_FML 1
 // CHECK-FULLFP16-VECTOR-SCALAR: #define __ARM_FEATURE_FP16_SCALAR_ARITHMETIC 1
 // CHECK-FULLFP16-VECTOR-SCALAR: #define __ARM_FEATURE_FP16_VECTOR_ARITHMETIC 1
 // CHECK-FULLFP16-VECTOR-SCALAR: #define __ARM_FP 0xE
@@ -220,7 +220,7 @@
 // RUN: %clang -target aarch64-none-linux-gnueabi -march=armv8-a+fp16+nosimd -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-FULLFP16-SCALAR %s
 // RUN: %clang -target aarch64-none-linux-gnueabi -march=armv8.4-a+fp16fml+nosimd -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-FULLFP16-SCALAR %s
 // RUN: %clang -target aarch64-none-linux-gnueabi -march=armv8.4-a+fp16+nosimd -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-FULLFP16-SCALAR %s
-// CHECK-FULLFP16-SCALAR-NOT:   #define __ARM_FEATURE_FP16FML 1
+// CHECK-FULLFP16-SCALAR-NOT:   #define __ARM_FEATURE_FP16_FML 1
 // CHECK-FULLFP16-SCALAR:       #define __ARM_FEATURE_FP16_SCALAR_ARITHMETIC 1
 // CHECK-FULLFP16-SCALAR-NOT:   #define __ARM_FEATURE_FP16_VECTOR_ARITHMETIC 1
 // CHECK-FULLFP16-SCALAR:       #define __ARM_FP 0xE
@@ -234,7 +234,7 @@
 // RUN: %clang -target aarch64-none-linux-gnueabi -march=armv8.4-a+nofp16 -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-FULLFP16-NOFML-VECTOR-SCALAR %s
 // RUN: %clang -target aarch64-none-linux-gnueabi -march=armv8.4-a+nofp16fml -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-FULLFP16-NOFML-VECTOR-SCALAR %s
 // RUN: %clang -target aarch64-none-linux-gnueabi -march=armv8.4-a+fp16fml+nofp16 -x c -E -dM %s -o - | FileCheck -match-full-lines --check-prefix=CHECK-FULLFP16-NOFML-VECTOR-SCALAR %s
-// CHECK-FULLFP16-NOFML-VECTOR-SCALAR-NOT: #define __ARM_FEATURE_FP16FML 1
+// CHECK-FULLFP16-NOFML-VECTOR-SCALAR-NOT: #define __ARM_FEATURE_FP16_FML 1
 // CHECK-FULLFP16-NOFML-VECTOR-SCALAR-NOT: #define __ARM_FEATURE_FP16_SCALAR_ARITHMETIC 1
 // CHECK-FULLFP16-NOFML-VECTOR-SCALAR-NOT: #define __ARM_FEATURE_FP16_VECTOR_ARITHMETIC 1
 // CHECK-FULLFP16-NOFML-VECTOR-SCALAR:     #define __ARM_FP 0xE