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
@@ -744,7 +744,10 @@
       else
         // Pushing the original feature string to give a sema error later on
         // when they get checked.
-        Features.push_back(Feature.str());
+        if (Feature.startswith("no"))
+          Features.push_back("-" + Feature.drop_front(2).str());
+        else
+          Features.push_back("+" + Feature.str());
     }
   };
 
@@ -792,13 +795,25 @@
         Ret.Duplicate = "tune=";
       else
         Ret.Tune = Feature.split("=").second.trim();
-    } else if (Feature.startswith("no-"))
-      Ret.Features.push_back("-" + Feature.split("-").second.str());
-    else if (Feature.startswith("+")) {
+    } else if (Feature.startswith("+")) {
       SplitAndAddFeatures(Feature, Ret.Features);
+    } else if (Feature.startswith("no-")) {
+      StringRef FeatureName =
+          llvm::AArch64::getArchExtFeature(Feature.split("-").second);
+      if (!FeatureName.empty())
+        Ret.Features.push_back("-" + FeatureName.drop_front(1).str());
+      else
+        Ret.Features.push_back("-" + Feature.split("-").second.str());
+    } else {
+      // Try parsing the string to the internal target feature name. If it is
+      // invalid, add the original string (which could already be an internal
+      // name). These should be checked later by isValidFeatureName.
+      StringRef FeatureName = llvm::AArch64::getArchExtFeature(Feature);
+      if (!FeatureName.empty())
+        Ret.Features.push_back(FeatureName.str());
+      else
+        Ret.Features.push_back("+" + Feature.str());
     }
-    else
-      Ret.Features.push_back("+" + Feature.str());
   }
   return Ret;
 }
diff --git a/clang/test/CodeGen/aarch64-targetattr.c b/clang/test/CodeGen/aarch64-targetattr.c
--- a/clang/test/CodeGen/aarch64-targetattr.c
+++ b/clang/test/CodeGen/aarch64-targetattr.c
@@ -75,6 +75,20 @@
 __attribute__((target("cpu=neoverse-n1,tune=cortex-a710,arch=armv8.6-a+sve2,branch-protection=standard")))
 void allplusbranchprotection() {}
 
+// These tests check that the user facing and internal llvm name are both accepted.
+// CHECK-LABEL: @plusnoneon() #18
+__attribute__((target("+noneon")))
+void plusnoneon() {}
+// CHECK-LABEL: @plusnosimd() #18
+__attribute__((target("+nosimd")))
+void plusnosimd() {}
+// CHECK-LABEL: @noneon() #18
+__attribute__((target("no-neon")))
+void noneon() {}
+// CHECK-LABEL: @nosimd() #18
+__attribute__((target("no-simd")))
+void nosimd() {}
+
 // CHECK: attributes #0 = { {{.*}} "target-features"="+v8.1a,+v8.2a,+v8a" }
 // CHECK: attributes #1 = { {{.*}} "target-features"="+sve,+v8.1a,+v8.2a,+v8a" }
 // CHECK: attributes #2 = { {{.*}} "target-features"="+sve2,+v8.1a,+v8.2a,+v8a" }
@@ -92,3 +106,4 @@
 // CHECK: attributes #15 = { {{.*}} "target-features"="+fullfp16" }
 // CHECK: attributes #16 = { {{.*}} "target-cpu"="neoverse-n1" "target-features"="+crc,+crypto,+dotprod,+fp-armv8,+fullfp16,+lse,+neon,+ras,+rcpc,+rdm,+spe,+ssbs,+sve2,+v8.1a,+v8.2a,+v8.3a,+v8.4a,+v8.5a,+v8.6a,+v8a" "tune-cpu"="cortex-a710" }
 // CHECK: attributes #17 = { {{.*}} "branch-target-enforcement"="true" {{.*}} "target-cpu"="neoverse-n1" "target-features"="+crc,+crypto,+dotprod,+fp-armv8,+fullfp16,+lse,+neon,+ras,+rcpc,+rdm,+spe,+ssbs,+sve2,+v8.1a,+v8.2a,+v8.3a,+v8.4a,+v8.5a,+v8.6a,+v8a" "tune-cpu"="cortex-a710" }
+// CHECK: attributes #18 = { {{.*}} "target-features"="-neon" }
diff --git a/clang/test/Sema/aarch64-fp16-target.c b/clang/test/Sema/aarch64-fp16-target.c
--- a/clang/test/Sema/aarch64-fp16-target.c
+++ b/clang/test/Sema/aarch64-fp16-target.c
@@ -10,13 +10,18 @@
   vabdh_f16(f16, f16);
 }
 
+__attribute__((target("fp16")))
+void fp16(float16_t f16) {
+  vabdh_f16(f16, f16);
+}
+
 __attribute__((target("arch=armv8-a+fp16")))
 void test_fp16_arch(float16_t f16) {
     vabdh_f16(f16, f16);
 }
 
 __attribute__((target("+fp16")))
-void test_fp16(float16_t f16) {
+void test_plusfp16(float16_t f16) {
     vabdh_f16(f16, f16);
 }