diff --git a/clang/lib/Driver/ToolChains/Arch/ARM.cpp b/clang/lib/Driver/ToolChains/Arch/ARM.cpp
--- a/clang/lib/Driver/ToolChains/Arch/ARM.cpp
+++ b/clang/lib/Driver/ToolChains/Arch/ARM.cpp
@@ -433,8 +433,8 @@
     llvm::ARM::getFPUFeatures(llvm::ARM::FK_NONE, Features);
 
     // Disable hardware FP features which have been enabled.
-    // FIXME: Disabling vfp2 and neon should be enough as all the other
-    //        features are dependent on these 2 features in LLVM. However
+    // FIXME: Disabling fpregs should be enough all by itself, since all
+    //        the other FP features are dependent on it. However
     //        there is currently no easy way to test this in clang, so for
     //        now just be explicit and disable all known dependent features
     //        as well.
@@ -442,6 +442,11 @@
                                 "neon", "crypto", "dotprod", "fp16fml"})
       if (std::find(std::begin(Features), std::end(Features), "+" + Feature) != std::end(Features))
         Features.push_back(Args.MakeArgString("-" + Feature));
+
+    // Disable the base feature unconditionally, even if it was not
+    // explicitly in the features list (e.g. if we had +vfp3, which
+    // implies it).
+    Features.push_back("-fpregs");
   }
 
   // En/disable crc code generation.
diff --git a/clang/test/CodeGen/arm-mfpu-none.c b/clang/test/CodeGen/arm-mfpu-none.c
new file mode 100644
--- /dev/null
+++ b/clang/test/CodeGen/arm-mfpu-none.c
@@ -0,0 +1,8 @@
+// REQUIRES: arm-registered-target
+// RUN: %clang -target arm-none-eabi -mcpu=cortex-m4 -mfpu=none -S -o - %s | FileCheck %s
+
+// CHECK-LABEL: compute
+// CHECK-NOT: {{s[0-9]}}
+float compute(float a, float b) {
+  return (a+b) * (a-b);
+}
diff --git a/llvm/lib/Support/ARMTargetParser.cpp b/llvm/lib/Support/ARMTargetParser.cpp
--- a/llvm/lib/Support/ARMTargetParser.cpp
+++ b/llvm/lib/Support/ARMTargetParser.cpp
@@ -198,6 +198,7 @@
     Features.push_back("-fp-armv8");
     break;
   case FPUVersion::NONE:
+    Features.push_back("-fpregs");
     Features.push_back("-vfp2");
     Features.push_back("-vfp3");
     Features.push_back("-fp16");