wgsl: Cleanup cruft related to quantizeToF16 (#3082)

This is only defined for f32, so doesn't really need to be defined in
the common super class. This allows for removing the various stub
references to it, that will never be implemented.

src/unittests/floating_point.spec.ts

@@ -3431,7 +3431,7 @@ g.test('negationInterval')
     );
   });
 
-g.test('quantizeToF16Interval_f32')
+g.test('quantizeToF16Interval')
   .paramsSubcasesOnly<ScalarToIntervalCase>(
     // prettier-ignore
     [

src/webgpu/util/floating_point.ts

@@ -4608,6 +4608,21 @@ class F32Traits extends FPTraits {
 
   // Framework - API
 
+  private readonly QuantizeToF16IntervalOp: ScalarToIntervalOp = {
+    impl: (n: number): FPInterval => {
+      const rounded = correctlyRoundedF16(n);
+      const flushed = addFlushedIfNeededF16(rounded);
+      return this.spanIntervals(...flushed.map(f => this.toInterval(f)));
+    },
+  };
+
+  protected quantizeToF16IntervalImpl(n: number): FPInterval {
+    return this.runScalarToIntervalOp(this.toInterval(n), this.QuantizeToF16IntervalOp);
+  }
+
+  /** Calculate an acceptance interval of quantizeToF16(x) */
+  public readonly quantizeToF16Interval = this.quantizeToF16IntervalImpl.bind(this);
+
   /**
    * Once-allocated ArrayBuffer/views to avoid overhead of allocation when
    * converting between numeric formats
@@ -4720,21 +4735,6 @@ class F32Traits extends FPTraits {
 
   /** Calculate an acceptance interval vector for unpack4x8unorm(x) */
   public readonly unpack4x8unormInterval = this.unpack4x8unormIntervalImpl.bind(this);
-
-  private readonly QuantizeToF16IntervalOp: ScalarToIntervalOp = {
-    impl: (n: number): FPInterval => {
-      const rounded = correctlyRoundedF16(n);
-      const flushed = addFlushedIfNeededF16(rounded);
-      return this.spanIntervals(...flushed.map(f => this.toInterval(f)));
-    },
-  };
-
-  protected quantizeToF16IntervalImpl(n: number): FPInterval {
-    return this.runScalarToIntervalOp(this.toInterval(n), this.QuantizeToF16IntervalOp);
-  }
-
-  /** Calculate an acceptance interval of quantizeToF16(x) */
-  public readonly quantizeToF16Interval = this.quantizeToF16IntervalImpl.bind(this);
 }
 
 // Need to separately allocate f32 traits, so they can be referenced by
@@ -5055,10 +5055,6 @@ class FPAbstractTraits extends FPTraits {
     'normalizeInterval'
   );
   public readonly powInterval = this.unimplementedScalarPairToInterval.bind(this, 'powInterval');
-  public readonly quantizeToF16Interval = this.unimplementedScalarToInterval.bind(
-    this,
-    'quantizeToF16Interval'
-  );
   public readonly radiansInterval = this.radiansIntervalImpl.bind(this);
   public readonly reflectInterval = this.unimplementedVectorPairToVector.bind(
     this,
@@ -5353,7 +5349,6 @@ class F16Traits extends FPTraits {
   public readonly negationInterval = this.negationIntervalImpl.bind(this);
   public readonly normalizeInterval = this.normalizeIntervalImpl.bind(this);
   public readonly powInterval = this.powIntervalImpl.bind(this);
-  public readonly quantizeToF16Interval = this.quantizeToF16IntervalNotAvailable.bind(this);
   public readonly radiansInterval = this.radiansIntervalImpl.bind(this);
   public readonly reflectInterval = this.reflectIntervalImpl.bind(this);
   public readonly refractInterval = this.refractIntervalImpl.bind(this);
@@ -5374,12 +5369,6 @@ class F16Traits extends FPTraits {
   public readonly tanhInterval = this.tanhIntervalImpl.bind(this);
   public readonly transposeInterval = this.transposeIntervalImpl.bind(this);
   public readonly truncInterval = this.truncIntervalImpl.bind(this);
-
-  /** quantizeToF16 has no f16 overload. */
-  private quantizeToF16IntervalNotAvailable(n: number): FPInterval {
-    unreachable("quantizeToF16 don't have f16 overload.");
-    return kF16UnboundedInterval;
-  }
 }
 
 export const FP = {