fixup! 5c220a7

Co-authored-by: beetrees <[email protected]>

Author: tgross35

crates/libm-test/src/special_case.rs

@@ -134,8 +134,11 @@ fn maybe_check_nan_bits<F: Float>(actual: F, expected: F, ctx: &CheckCtx) -> Opt
         return None;
     }
 
-    // The musl implementations uses x87 instructions on i686 which quiets signaling NaNs
-    if cfg!(target_arch = "x86") && ctx.basis == CheckBasis::Musl && ctx.canonical_name == "fabs" {
+    // LLVM currently uses x87 instructions which quieten signalling NaNs to handle the i686
+    // `extern "C"` `f32`/`f64` return ABI.
+    // LLVM issue <https://github.com/llvm/llvm-project/issues/66803>
+    // Rust issue <https://github.com/rust-lang/rust/issues/115567>
+    if cfg!(target_arch = "x86") && ctx.basis == CheckBasis::Musl {
         return SKIP;
     }