From 1d577c8267569030d3b1fb0f53cfbfa9b7618b2c Mon Sep 17 00:00:00 2001
From: Jonathan G Rennison <j.g.rennison@gmail.com>
Date: Tue, 25 Feb 2020 19:26:45 +0000
Subject: [PATCH] Add utility functions for integer division towards +/-
 infinity

---
 src/core/math_func.hpp | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/src/core/math_func.hpp b/src/core/math_func.hpp
index 5910a401d8..013f03fbeb 100644
--- a/src/core/math_func.hpp
+++ b/src/core/math_func.hpp
@@ -408,6 +408,30 @@ static inline int DivAwayFromZero(int a, uint b)
 	}
 }
 
+/**
+ * Computes a / b rounded towards negative infinity for signed a and unsigned b.
+ * @param a Numerator
+ * @param b Denominator
+ * @return Quotient, rounded towards negative infinity
+ */
+template <typename T>
+static inline T DivTowardsNegativeInf(T a, T b)
+{
+	return (a / b) - (a % b < 0 ? 1 : 0);
+}
+
+/**
+ * Computes a / b rounded towards positive infinity for signed a and unsigned b.
+ * @param a Numerator
+ * @param b Denominator
+ * @return Quotient, rounded towards positive infinity
+ */
+template <typename T>
+static inline T DivTowardsPositiveInf(T a, T b)
+{
+	return (a / b) + (a % b > 0 ? 1 : 0);
+}
+
 uint32 IntSqrt(uint32 num);
 
 #endif /* MATH_FUNC_HPP */