[Bf-blender-cvs] [990515a5a72] master: Math Lib: add divide_floor_i
Campbell Barton
noreply at git.blender.org
Mon Sep 18 05:12:41 CEST 2017
Commit: 990515a5a72692e7ee93c68d393352cad375171c
Author: Campbell Barton
Date: Mon Sep 18 13:14:58 2017 +1000
Branches: master
https://developer.blender.org/rB990515a5a72692e7ee93c68d393352cad375171c
Math Lib: add divide_floor_i
Integer division that floors on negative output (like Python's).
===================================================================
M source/blender/blenlib/intern/math_base_inline.c
===================================================================
diff --git a/source/blender/blenlib/intern/math_base_inline.c b/source/blender/blenlib/intern/math_base_inline.c
index 6574c001a23..5ae2b1a70a7 100644
--- a/source/blender/blenlib/intern/math_base_inline.c
+++ b/source/blender/blenlib/intern/math_base_inline.c
@@ -194,6 +194,17 @@ MINLINE int divide_round_i(int a, int b)
}
/**
+ * Integer division that floors negative result.
+ * \note This works like Python's int division.
+ */
+MINLINE int divide_floor_i(int a, int b)
+{
+ int d = a / b;
+ int r = a % b; /* Optimizes into a single division. */
+ return r ? d - ((a < 0) ^ (b < 0)) : d;
+}
+
+/**
* modulo that handles negative numbers, works the same as Python's.
*/
MINLINE int mod_i(int i, int n)
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