From f4ad0fab803cda686a1582923a29acfcc6348765 Mon Sep 17 00:00:00 2001
From: Stephen Heumann <stephenheumann@gmail.com>
Date: Sun, 18 Dec 2016 22:52:53 -0600
Subject: [PATCH] Fix bug in unsigned 32-bit division and remainder routines,
 which could cause mis-evaluation of constant expressions.

The following example shows cases that were mis-evaluated:

/* Should print "3 10000" */
#include <stdio.h>
int main(void)
{
	printf("%lu %lu\n", 100000ul / 30000ul, 100000ul % 30000ul);
}
---
 Expression.asm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Expression.asm b/Expression.asm
index a8500aa..a79d1f3 100644
--- a/Expression.asm
+++ b/Expression.asm
@@ -90,7 +90,7 @@ dv3      asl   ans                      roll up the next number
          rol   ans+6
          sec                            subtract for this digit
          lda   ans+4
-         sbc   num1
+         sbc   num2
          tax
          lda   ans+6
          sbc   num2+2
@@ -267,7 +267,7 @@ dv3      asl   ans                      roll up the next number
          rol   ans+6
          sec                            subtract for this digit
          lda   ans+4
-         sbc   num1
+         sbc   num2
          tax
          lda   ans+6
          sbc   num2+2