Minor updates

Author: tgross35

library/std/build.rs

@@ -133,16 +133,17 @@ fn main() {
         _ => false,
     };
 
+    // These are currently empty, but will fill up as some platforms move from completely
+    // unreliable to reliable basics but unreliable math.
+
     // LLVM is currenlty adding missing routines, <https://github.com/llvm/llvm-project/issues/93566>
     let has_reliable_f16_math = has_reliable_f16
         && match (target_arch.as_str(), target_os.as_str()) {
-            ("x86", _) => false,
             _ => true,
         };
 
     let has_reliable_f128_math = has_reliable_f128
         && match (target_arch.as_str(), target_os.as_str()) {
-            // ("aarch64", _) => false,
             _ => true,
         };
 

library/std/src/f16/tests.rs

@@ -423,13 +423,11 @@ fn test_recip() {
 
 #[test]
 fn test_powi() {
-    // FIXME(f16_f128): LLVM misoptimizes `powi.f16`
+    // FIXME(llvm19): LLVM misoptimizes `powi.f16`
     // <https://github.com/llvm/llvm-project/issues/98665>
     // let nan: f16 = f16::NAN;
     // let inf: f16 = f16::INFINITY;
     // let neg_inf: f16 = f16::NEG_INFINITY;
-    // dbg!(1.0f16);
-    // dbg!(1.0f16.powi(1));
     // assert_eq!(1.0f16.powi(1), 1.0);
     // assert_approx_eq!((-3.1f16).powi(2), 9.61, TOL_0);
     // assert_approx_eq!(5.9f16.powi(-2), 0.028727, TOL_N2);