From 2bff8204614fecc2f3eeb371de321b26663c2abf Mon Sep 17 00:00:00 2001
From: Thomas Churchman <thomas@kepow.org>
Date: Tue, 29 Oct 2024 14:24:20 +0100
Subject: [PATCH] Provide rem_euclid in FloatFuncs

---
 src/common.rs | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/common.rs b/src/common.rs
index 30036869..b8d8a2b1 100644
--- a/src/common.rs
+++ b/src/common.rs
@@ -34,6 +34,9 @@ macro_rules! define_float_funcs {
             /// Special implementation for signum, because libm doesn't have it.
             fn signum(self) -> Self;
 
+            /// Special implementation for rem_euclid, because libm doesn't have it.
+            pub fn rem_euclid(self, rhs: Self) -> Self;
+
             $(fn $name(self $(,$arg: $arg_ty)*) -> $ret;)+
         }
 
@@ -51,6 +54,16 @@ macro_rules! define_float_funcs {
                 }
             }
 
+            #[inline]
+            pub fn rem_euclid(self, rhs: f32) -> f32 {
+                let r = self % rhs;
+                if r < 0.0 {
+                    r + rhs.abs()
+                } else {
+                    r
+                }
+            }
+
             $(fn $name(self $(,$arg: $arg_ty)*) -> $ret {
                 #[cfg(feature = "libm")]
                 return libm::$lfname(self $(,$arg as _)*);
@@ -73,6 +86,16 @@ macro_rules! define_float_funcs {
                 }
             }
 
+            #[inline]
+            pub fn rem_euclid(self, rhs: f64) -> f64 {
+                let r = self % rhs;
+                if r < 0.0 {
+                    r + rhs.abs()
+                } else {
+                    r
+                }
+            }
+
             $(fn $name(self $(,$arg: $arg_ty)*) -> $ret {
                 #[cfg(feature = "libm")]
                 return libm::$lname(self $(,$arg as _)*);