rcx

commit c767da3aab656bf85f3ec956c5037a786c8d343e
parent 3260a7d245b9f6f9b764c4cc47cb029b93a67f46
Author: Robert Russell <robert@rr3.xyz>
Date:   Sun, 12 Jan 2025 23:52:36 -0800

Add floored division

Diffstat:
M
inc/bits.h
 | 
36
++++++++++++++++++++++++++++++++++++

1 file changed, 36 insertions(+), 0 deletions(-)
diff --git a/inc/bits.h b/inc/bits.h
@@ -1,5 +1,6 @@
 #pragma once
 
+#include <stdbool.h>
 #include <string.h>
 
 #include "def.h"
@@ -413,6 +414,41 @@ r_muls64(i64 *h, u64 *l, i64 x, i64 y) {
 }
 
 
+/* ----- Floor division ----- */
+
+static inline void
+r_divs8(i8 *q, i8 *r, i8 x, i8 y) {
+	i8 qq = x / y, rr = x % y;
+	bool neg = (x < 0) ^ (y < 0);
+	*q = qq - ((rr != 0) & neg);
+	*r = neg ? rr + y : rr;
+}
+
+static inline void
+r_divs16(i16 *q, i16 *r, i16 x, i16 y) {
+	i16 qq = x / y, rr = x % y;
+	bool neg = (x < 0) ^ (y < 0);
+	*q = qq - ((rr != 0) & neg);
+	*r = neg ? rr + y : rr;
+}
+
+static inline void
+r_divs32(i32 *q, i32 *r, i32 x, i32 y) {
+	i32 qq = x / y, rr = x % y;
+	bool neg = (x < 0) ^ (y < 0);
+	*q = qq - ((rr != 0) & neg);
+	*r = neg ? rr + y : rr;
+}
+
+static inline void
+r_divs64(i64 *q, i64 *r, i64 x, i64 y) {
+	i64 qq = x / y, rr = x % y;
+	bool neg = (x < 0) ^ (y < 0);
+	*q = qq - ((rr != 0) & neg);
+	*r = neg ? rr + y : rr;
+}
+
+
 /* ----- Byte swaps/reversals ----- */
 
 #ifdef __GNUC__