From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: PJ Reiniger <pj.reiniger@gmail.com>
Date: Tue, 3 May 2022 22:50:24 -0400
Subject: [PATCH 15/37] Add lerp and sgn

---
 llvm/include/llvm/Support/MathExtras.h | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/llvm/include/llvm/Support/MathExtras.h b/llvm/include/llvm/Support/MathExtras.h
index b9084182158757647cc9896320a353a373b0f9ec..4033e032b5979a4f25b4c16f3988fb11087ed6bb 100644
--- a/llvm/include/llvm/Support/MathExtras.h
+++ b/llvm/include/llvm/Support/MathExtras.h
@@ -751,6 +751,27 @@ using stack_float_t = volatile float;
 using stack_float_t = float;
 #endif
 
+// Typesafe implementation of the signum function.
+// Returns -1 if negative, 1 if positive, 0 if 0.
+template <typename T>
+constexpr int sgn(T val) {
+  return (T(0) < val) - (val < T(0));
+}
+
+/**
+ * Linearly interpolates between two values.
+ *
+ * @param startValue The start value.
+ * @param endValue The end value.
+ * @param t The fraction for interpolation.
+ *
+ * @return The interpolated value.
+ */
+template <typename T>
+constexpr T Lerp(const T& startValue, const T& endValue, double t) {
+  return startValue + (endValue - startValue) * t;
+}
+
 } // namespace llvm
 
 #endif