float: Add f16 to test-float-parse

Author: tgross35

src/bootstrap/src/core/build_steps/test.rs

@@ -3538,7 +3538,7 @@ impl Step for TestFloatParse {
         builder.ensure(compile::Std::new(compiler, self.host));
 
         // Run any unit tests in the crate
-        let cargo_test = tool::prepare_tool_cargo(
+        let mut cargo_test = tool::prepare_tool_cargo(
             builder,
             compiler,
             Mode::ToolStd,
@@ -3548,6 +3548,7 @@ impl Step for TestFloatParse {
             SourceType::InTree,
             &[],
         );
+        cargo_test.allow_features("f16");
 
         run_cargo_test(
             cargo_test,
@@ -3571,6 +3572,7 @@ impl Step for TestFloatParse {
             SourceType::InTree,
             &[],
         );
+        cargo_run.allow_features("f16");
 
         cargo_run.arg("--");
         if builder.config.args().is_empty() {

src/etc/test-float-parse/src/gen/subnorm.rs

@@ -1,4 +1,3 @@
-use std::cmp::min;
 use std::fmt::Write;
 use std::ops::RangeInclusive;
 
@@ -83,7 +82,13 @@ where
     }
 
     fn new() -> Self {
-        Self { iter: F::Int::ZERO..=min(F::Int::ONE << 22, F::MAN_BITS.try_into().unwrap()) }
+        let upper_lim = if F::MAN_BITS < 22 {
+            F::Int::ONE << 22
+        } else {
+            (F::Int::ONE << F::MAN_BITS) - F::Int::ONE
+        };
+
+        Self { iter: F::Int::ZERO..=upper_lim }
     }
 
     fn write_string(s: &mut String, ctx: Self::WriteCtx) {

src/etc/test-float-parse/src/lib.rs

@@ -1,3 +1,5 @@
+#![feature(f16)]
+
 mod traits;
 mod ui;
 mod validate;
@@ -114,6 +116,7 @@ pub fn register_tests(cfg: &Config) -> Vec<TestInfo> {
     let mut tests = Vec::new();
 
     // Register normal generators for all floats.
+    register_float::<f16>(&mut tests, cfg);
     register_float::<f32>(&mut tests, cfg);
     register_float::<f64>(&mut tests, cfg);
 

src/etc/test-float-parse/src/traits.rs

@@ -98,7 +98,7 @@ macro_rules! impl_int {
     }
 }
 
-impl_int!(u32, i32; u64, i64);
+impl_int!(u16, i16; u32, i32; u64, i64);
 
 /// Floating point types.
 pub trait Float:
@@ -147,12 +147,12 @@ pub trait Float:
 }
 
 macro_rules! impl_float {
-    ($($fty:ty, $ity:ty, $bits:literal);+) => {
+    ($($fty:ty, $ity:ty);+) => {
         $(
             impl Float for $fty {
                 type Int = $ity;
                 type SInt = <Self::Int as Int>::Signed;
-                const BITS: u32 = $bits;
+                const BITS: u32 = <$ity>::BITS;
                 const MAN_BITS: u32 = Self::MANTISSA_DIGITS - 1;
                 const MAN_MASK: Self::Int = (Self::Int::ONE << Self::MAN_BITS) - Self::Int::ONE;
                 const SIGN_MASK: Self::Int = Self::Int::ONE << (Self::BITS-1);
@@ -168,7 +168,7 @@ macro_rules! impl_float {
     }
 }
 
-impl_float!(f32, u32, 32; f64, u64, 64);
+impl_float!(f16, u16; f32, u32; f64, u64);
 
 /// A test generator. Should provide an iterator that produces unique patterns to parse.
 ///