From c3f417aa1e55d9752670dd155f09ab5b476d248e Mon Sep 17 00:00:00 2001
From: Nick Wanninger <nickwanninger@gmail.com>
Date: Fri, 5 Mar 2021 18:09:48 -0600
Subject: [PATCH] LibM: optimized (branchless) copysign

---
 Userland/Libraries/LibM/math.cpp | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

diff --git a/Userland/Libraries/LibM/math.cpp b/Userland/Libraries/LibM/math.cpp
index 115e5f5200..47ab3e537c 100644
--- a/Userland/Libraries/LibM/math.cpp
+++ b/Userland/Libraries/LibM/math.cpp
@@ -745,12 +745,11 @@ long double nexttowardl(long double, long double) NOEXCEPT
 
 double copysign(double x, double y)
 {
-    if (x < 0 && y < 0)
-        return x;
-    if (x >= 0 && y < 0)
-        return -x;
-    if (x < 0 && y >= 0)
-        return -x;
-    return x;
+    using Extractor = FloatExtractor<decltype(x)>;
+    Extractor ex, ey;
+    ex.d = x;
+    ey.d = y;
+    ex.sign = ey.sign;
+    return ex.d;
 }
 }