From 51bc27be0188d4950421dba3a06d39ee73ba3893 Mon Sep 17 00:00:00 2001
From: gingerBill <gingerBill@users.noreply.github.com>
Date: Sun, 12 Jul 2026 00:04:35 +0100
Subject: [PATCH] Fix `big_int_shr` for arithmetic shift (i.e. negative
 numbers)

---
 src/big_int.cpp | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/big_int.cpp b/src/big_int.cpp
index a8ea2079b..f59dccf24 100644
--- a/src/big_int.cpp
+++ b/src/big_int.cpp
@@ -353,9 +353,15 @@ gb_internal void big_int_shl(BigInt *dst, BigInt const *x, BigInt const *y) {
 
 gb_internal void big_int_shr(BigInt *dst, BigInt const *x, BigInt const *y) {
 	u32 yy = mp_get_u32(y);
-	BigInt d = {};
-	mp_div_2d(x, yy, dst, &d);
-	big_int_dealloc(&d);
+
+	BigInt rem = {};
+	defer (mp_clear(&rem));
+
+	mp_div_2d(x, yy, dst, &rem);
+
+	if (mp_isneg(x) && !mp_iszero(&rem)) {
+		mp_sub_d(dst, 1, dst);
+	}
 }
 
 gb_internal void big_int_mul_u64(BigInt *dst, BigInt const *x, u64 y) {