Merge remote-tracking branch 'upstream/master'

1 files changed, 86 insertions, 0 deletions

diff --git a/src/math_util.c b/src/math_util.c
new file mode 100644
index 000000000..466a31921
--- /dev/null
+++ b/src/math_util.c
@@ -0,0 +1,86 @@
+#include "global.h"
+
+s16 sub_80D8AA0(s16 x, s16 y)
+{
+    s32 result;
+
+    result = x;
+    result *= y;
+    result /= 256;
+    return result;
+}
+
+s16 sub_80D8ABC(u8 s, s16 x, s16 y)
+{
+    s32 result;
+
+    result = x;
+    result *= y;
+    result /= (1 << s);
+    return result;
+}
+
+s32 sub_80D8AE0(s32 x, s32 y)
+{
+    s64 result;
+
+    result = x;
+    result *= y;
+    result /= 256;
+    return result;
+}
+
+s16 sub_80D8B1C(s16 x, s16 y)
+{
+    if (y == 0)
+    {
+        return 0;
+    }
+    return (x << 8) / y;
+}
+
+s16 sub_80D8B40(u8 s, s16 x, s16 y)
+{
+    if (y == 0)
+    {
+        return 0;
+    }
+    return (x << s) / y;
+}
+
+s32 sub_80D8B68(s32 x, s32 y)
+{
+    s64 _x;
+
+    if (y == 0)
+    {
+        return 0;
+    }
+    _x = x;
+    _x *= 256;
+    return _x / y;
+}
+
+s16 sub_80D8B90(s16 y)
+{
+    s32 x;
+
+    x = 0x10000;
+    return x / y;
+}
+
+s16 sub_80D8BA8(u8 s, s16 y)
+{
+    s32 x;
+
+    x = 0x100 << s;
+    return x / y;
+}
+
+s32 sub_80D8BC8(s32 y)
+{
+    s64 x;
+
+    x = 0x10000;
+    return x / y;
+}