From 5dad727bdc9aa69145cd48c08c42b8e878a3c84b Mon Sep 17 00:00:00 2001
From: Kleis Auke Wolthuizen <github@kleisauke.nl>
Date: Sun, 11 Aug 2024 11:36:25 +0200
Subject: [PATCH] Configure `f16` and `f128` support for WebAssembly

---
 library/compiler-builtins/build.rs           | 2 ++
 library/compiler-builtins/testcrate/build.rs | 5 +++--
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/library/compiler-builtins/build.rs b/library/compiler-builtins/build.rs
index 93e323e6b236..56716b906aba 100644
--- a/library/compiler-builtins/build.rs
+++ b/library/compiler-builtins/build.rs
@@ -283,6 +283,8 @@ fn configure_f16_f128(target: &Target) {
         "powerpc64" if &target.os == "aix" => (true, false),
         // `f128` crashes <https://github.com/llvm/llvm-project/issues/41838>
         "sparc" | "sparcv9" => (true, false),
+        // `f16` miscompiles <https://github.com/llvm/llvm-project/issues/96438>
+        "wasm32" | "wasm64" => (false, true),
         // Most everything else works as of LLVM 19
         _ => (true, true),
     };
diff --git a/library/compiler-builtins/testcrate/build.rs b/library/compiler-builtins/testcrate/build.rs
index 8c441de8a958..74d74559ef67 100644
--- a/library/compiler-builtins/testcrate/build.rs
+++ b/library/compiler-builtins/testcrate/build.rs
@@ -54,8 +54,9 @@ fn main() {
         || target.starts_with("i586-")
         || target.contains("windows-")
         // Linking says "error: function signature mismatch: __extendhfsf2" and seems to
-        // think the signature is either `(i32) -> f32` or `(f32) -> f32`
-        || target.starts_with("wasm32-")
+        // think the signature is either `(i32) -> f32` or `(f32) -> f32`. See
+        // <https://github.com/llvm/llvm-project/issues/96438>.
+        || target.starts_with("wasm")
     {
         features.insert(Feature::NoSysF16);
         features.insert(Feature::NoSysF16F128Convert);