Index: lib/Transforms/Utils/FunctionComparator.cpp
===================================================================
--- lib/Transforms/Utils/FunctionComparator.cpp
+++ lib/Transforms/Utils/FunctionComparator.cpp
@@ -710,7 +710,7 @@
     return Res;
   if (int Res = cmpNumbers(L->getDialect(), R->getDialect()))
     return Res;
-  llvm_unreachable("InlineAsm blocks were not uniqued.");
+  assert(L->getFunctionType() != R->getFunctionType());
   return 0;
 }
 
Index: test/Transforms/MergeFunc/inline-asm.ll
===================================================================
--- /dev/null
+++ test/Transforms/MergeFunc/inline-asm.ll
@@ -0,0 +1,35 @@
+; RUN: opt -mergefunc -S < %s | FileCheck %s
+define internal void @float_ptr_arg() {
+  call void asm "nop", "r"(float* null)
+  ret void
+}
+
+define internal void @int_ptr_arg() {
+; CHECK-NOT: @int_ptr_arg()
+  call void asm "nop", "r"(i32* null)
+  ret void
+}
+
+define internal void @float_ptr_ret() {
+  call float* asm "nop", "=r"()
+  ret void
+}
+
+define internal void @int_ptr_ret() {
+; CHECK-NOT: @int_ptr_ret()
+  call i32* asm "nop", "=r"()
+  ret void
+}
+
+define void @do_calls() {
+; CHECK-LABEL: @do_calls
+; CHECK-NEXT call void @float_ptr_arg()
+; CHECK-NEXT call void @float_ptr_arg()
+; CHECK-NEXT call void @float_ptr_ret()
+; CHECK-NEXT call void @float_ptr_ret()
+    call void @float_ptr_arg()
+    call void @int_ptr_arg()
+    call void @float_ptr_ret()
+    call void @int_ptr_ret()
+    ret void
+}