Index: llvm/lib/IR/Verifier.cpp
===================================================================
--- llvm/lib/IR/Verifier.cpp
+++ llvm/lib/IR/Verifier.cpp
@@ -279,6 +279,10 @@
   /// already.
   bool SawFrameEscape;
 
+  /// Whether or not we've seen constrained floating-point intrinsics
+  /// in a function.
+  bool HasConstrainedFP;
+
   /// Whether the current function has a DISubprogram attached to it.
   bool HasDebugInfo = false;
 
@@ -2215,6 +2219,8 @@
 // visitFunction - Verify that a function is ok.
 //
 void Verifier::visitFunction(const Function &F) {
+  HasConstrainedFP = false;
+
   visitGlobalValue(F);
 
   // Check function arguments.
@@ -2403,6 +2409,13 @@
       Assert(false, "Invalid user of intrinsic instruction!", U);
   }
 
+  // Verify that the function has the correct attributes if a constrained
+  // floating-point value was seen.
+  if (HasConstrainedFP)
+    Assert (F.hasFnAttribute(Attribute::StrictFP),
+            "Constrained floating point requires function attribute strictfp!",
+            &F);
+
   auto *N = F.getSubprogram();
   HasDebugInfo = (N != nullptr);
   if (!HasDebugInfo)
@@ -2956,6 +2969,15 @@
   // Verify call attributes.
   verifyFunctionAttrs(FTy, Attrs, &Call, IsIntrinsic);
 
+  // Verify strictfp attributes match.
+  Function *ContainingF = Call.getFunction();
+  AttributeSet CallAttrs = Attrs.getFnAttributes();
+  Assert (ContainingF->hasFnAttribute(Attribute::StrictFP) ==
+          CallAttrs.hasAttribute(Attribute::StrictFP),
+            "Functions and their contained calls must match "
+            "in use of attribute strictfp!",
+            ContainingF, &Call);
+
   // Conservatively check the inalloca argument.
   // We have a bug if we can find that there is an underlying alloca without
   // inalloca.
@@ -5008,6 +5030,10 @@
 void Verifier::visitConstrainedFPIntrinsic(ConstrainedFPIntrinsic &FPI) {
   unsigned NumOperands;
   bool HasRoundingMD;
+  HasConstrainedFP = true;
+  AttributeSet CallAttrs = FPI.getAttributes().getFnAttributes();
+  Assert (CallAttrs.hasAttribute(Attribute::StrictFP),
+          "Constrained FP intrinsics require strictfp attribute.", &FPI);
   switch (FPI.getIntrinsicID()) {
 #define INSTRUCTION(NAME, NARG, ROUND_MODE, INTRINSIC)                         \
   case Intrinsic::INTRINSIC:                                                   \
Index: llvm/test/Verifier/fp-intrinsics.ll
===================================================================
--- llvm/test/Verifier/fp-intrinsics.ll
+++ llvm/test/Verifier/fp-intrinsics.ll
@@ -3,9 +3,13 @@
 ; RUN: sed -e s/.T3:// %s | not opt -verify -disable-output 2>&1 | FileCheck --check-prefix=CHECK3 %s
 ; RUN: sed -e s/.T4:// %s | not opt -verify -disable-output 2>&1 | FileCheck --check-prefix=CHECK4 %s
 ; RUN: sed -e s/.T5:// %s | not opt -verify -disable-output 2>&1 | FileCheck --check-prefix=CHECK5 %s
+; RUN: sed -e s/.T6:// %s | not opt -verify -disable-output 2>&1 | FileCheck --check-prefix=CHECK6 %s
+; RUN: sed -e s/.T7:// %s | not opt -verify -disable-output 2>&1 | FileCheck --check-prefix=CHECK7 %s
+; RUN: sed -e s/.T8:// %s | not opt -verify -disable-output 2>&1 | FileCheck --check-prefix=CHECK8 %s
 
 ; Common declarations used for all runs.
 declare double @llvm.experimental.constrained.fadd.f64(double, double, metadata, metadata)
+declare float @llvm.experimental.constrained.fadd.f32(float, float, metadata, metadata)
 declare double @llvm.experimental.constrained.sqrt.f64(double, metadata, metadata)
 
 ; Test that the verifier accepts legal code, and that the correct attributes are
@@ -77,4 +81,35 @@
 ;T5:   ret double %fadd
 ;T5: }
 
+; Test for mismatched function and function call attributes
+; CHECK6: Functions and their contained calls must match in use of attribute strictfp!
+;T6: define double @f6(double %a) #0 {
+;T6: entry:
+;T6:   %fadd = call double @llvm.experimental.constrained.sqrt.f64(
+;T6:                                           double %a,
+;T6:                                           metadata !"round.dynamic",
+;T6:                                           metadata !"fpexcept.strict")
+;T6:   ret double %fadd
+;T6: }
+
+; Test for mismatched function and function call attributes
+; CHECK7: Functions and their contained calls must match in use of attribute strictfp!
+;T7: declare double @llvm.sqrt.f64(double)
+;T7: define double @f7(double %a) #0 {
+;T7: entry:
+;T7:   %sqrt = call double @llvm.sqrt.f64(double %a)
+;T7:   ret double %sqrt
+;T7: }
+
+; Test for mismatched function and function call attributes
+; CHECK8: Functions and their contained calls must match in use of attribute strictfp!
+;T8: define double @f8(double %a) {
+;T8: entry:
+;T8:   %fadd = call double @llvm.experimental.constrained.sqrt.f64(
+;T8:                                           double %a,
+;T8:                                           metadata !"round.dynamic",
+;T8:                                           metadata !"fpexcept.strict") #0
+;T8:   ret double %fadd
+;T8: }
+
 attributes #0 = { strictfp }