diff --git a/src/float/div.rs b/src/float/div.rs
index 910ec49c..d4cca06c 100644
--- a/src/float/div.rs
+++ b/src/float/div.rs
@@ -211,23 +211,16 @@ impl FloatDivision for f32 {
     /// targets. Not used by default as it requires performing more work during
     /// rounding and would hardly help on regular 32- or 64-bit targets.
     const C_HW: HalfRep<Self> = guess!(HalfRep<Self>);
-
-    // 0x7504;
 }
 
 impl FloatDivision for f64 {
-    // const HALF_ITERATIONS: usize = 3;
-
     /// HW is at least 32. Shifting into the highest bits if needed.
-    const C_HW: HalfRep<Self> = 0x7504F333 << (HalfRep::<Self>::BITS - 32);
+    const C_HW: HalfRep<Self> = guess!(HalfRep<Self>);
 }
 
 #[cfg(not(feature = "no-f16-f128"))]
 impl FloatDivision for f128 {
-    // const HALF_ITERATIONS: usize = 4;
-
-    // const C_HW: HalfRep<Self> = 0x7504F333 << (HalfRep::<Self>::BITS - 32);
-    const C_HW: HalfRep<Self> = 0x7504f333f9de6108;
+    const C_HW: HalfRep<Self> = guess!(HalfRep<Self>);
 }
 
 fn div<F>(a: F, b: F) -> F