From: John Hodge <tpg@mutabah.net>
Date: Sat, 10 May 2014 07:40:29 +0000 (+0800)
Subject: Kernel/arch - Fix common division macro to handle numerators around datatype max
X-Git-Url: https://git.ucc.asn.au/?a=commitdiff_plain;h=7b0611393a98399063aefaa87583b05fef13f6e3;p=tpg%2Facess2.git

Kernel/arch - Fix common division macro to handle numerators around datatype max
---

diff --git a/KernelLand/Kernel/arch/helpers.h b/KernelLand/Kernel/arch/helpers.h
index 4d85fcb4..b4780310 100644
--- a/KernelLand/Kernel/arch/helpers.h
+++ b/KernelLand/Kernel/arch/helpers.h
@@ -14,10 +14,10 @@
 //  > If the `N` value is greater than `D`, we can set this bit
 #define DEF_DIVMOD(s) Uint##s __divmod##s(Uint##s N, Uint##s D, Uint##s*Rem){\
 	Uint##s ret=0,add=1;\
-	while(N>=D&&add) {D<<=1;add<<=1;}\
-	while(add>1){\
-		add>>=1;D>>=1;\
+	while(N/2>=D&&add) {D<<=1;add<<=1;}\
+	while(add>0){\
 		if(N>=D){ret+=add;N-=D;}\
+		add>>=1;D>>=1;\
 	}\
 	if(Rem)*Rem = N;\
 	return ret;\