From 4b21f09d8d1e2c5a9d231eb59c31bec21138f051 Mon Sep 17 00:00:00 2001
From: Trevor Gross <tmgross@umich.edu>
Date: Sun, 23 Feb 2025 23:43:26 +0000
Subject: [PATCH] Update the `libm` submodule

This requires privately reexporting `libm`'s `support` module at crate
root, where it is expected for macros. Once `libm` is made always
available, the reexport can be simplified.

This delta adds a lot of routines to `f16` and `f128`:

* ceil
* floor
* fma (f128 only)
* fmax
* fmin
* fmod
* ldexp
* rint
* round
* scalbn
* sqrt

Additionally, the following new API was added for all four float types:

* fmaximum
* fmaximum_num
* fminimum
* fminimum_num
* roundeven

There are also some significant performance improvements for `sqrt` and
`sqrtf`, as well as precision improvements for `cbrt` (both `f32` and
`f64` versions of this function are now always correctly rounded).
---
 libm        |  2 +-
 src/lib.rs  | 14 ++++++++++++++
 src/math.rs |  2 +-
 3 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/libm b/libm
index 8e82616f..9a60739f 160000
--- a/libm
+++ b/libm
@@ -1 +1 @@
-Subproject commit 8e82616f154b06cf4ee9cdb82a4f56474a403d04
+Subproject commit 9a60739f6407e54f9899c43233bec368c0e97de7
diff --git a/src/lib.rs b/src/lib.rs
index ffcd3586..9123f4b4 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -58,6 +58,20 @@ pub mod int;
     all(target_family = "wasm", not(target_os = "unknown"))
 )))]
 pub mod math;
+
+// `libm` expects its `support` module to be available in the crate root. This config can be
+// cleaned up once `libm` is made always available.
+#[cfg(not(any(
+    all(
+        target_arch = "x86",
+        not(target_feature = "sse2"),
+        not(target_os = "uefi"),
+    ),
+    unix,
+    all(target_family = "wasm", not(target_os = "unknown"))
+)))]
+use math::libm::support;
+
 pub mod mem;
 
 #[cfg(target_arch = "arm")]
diff --git a/src/math.rs b/src/math.rs
index 21670f24..fef5358e 100644
--- a/src/math.rs
+++ b/src/math.rs
@@ -3,7 +3,7 @@
 #[allow(unused_imports)]
 #[allow(clippy::all)]
 #[path = "../libm/src/math/mod.rs"]
-mod libm;
+pub(crate) mod libm;
 
 #[allow(unused_macros)]
 macro_rules! no_mangle {