================
@@ -7022,9 +7044,18 @@ mlir::Value IntrinsicLibrary::genMod(mlir::Type 
resultType,
   if (mlir::isa<mlir::IntegerType>(resultType))
     return mlir::arith::RemSIOp::create(builder, loc, args[0], args[1]);
 
-  // Use runtime.
-  return builder.createConvert(
-      loc, resultType, fir::runtime::genMod(builder, loc, args[0], args[1]));
+  if (useFastRealMod) {
+    // If fast MOD for REAL has been requested, generate less precise,
+    // but faster code directly.
+    assert(resultType.isFloat() &&
+           "non floating-point type hit for fast real MOD");
----------------
tblah wrote:

Maybe this should just be part of the condition above
```
if (useFastRealMod && resultType.isFloat())
```

https://github.com/llvm/llvm-project/pull/160660
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