From edd2d136a062a9fe06b0c7dd506e203e6bb80081 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Oliver=20St=C3=B6neberg?=
 <firewave@users.noreply.github.com>
Date: Sun, 19 May 2013 18:48:10 +0000
Subject: [PATCH] unrolled modulo in {div|divu}_64x32_rem() and
 {mod|modu}_64x32() since it is apparently faster - this also gets rid of a
 duplicated div operation in {div|divu}_64x32_rem() / div*_64x32_rem() now
 call div*_64x32() (nw)

---
 src/emu/eminline.h | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/emu/eminline.h b/src/emu/eminline.h
index 992a5039cf9..b6ae6fce342 100644
--- a/src/emu/eminline.h
+++ b/src/emu/eminline.h
@@ -155,8 +155,9 @@ INLINE UINT32 divu_64x32(UINT64 a, UINT32 b)
 #ifndef div_64x32_rem
 INLINE INT32 div_64x32_rem(INT64 a, INT32 b, INT32 *remainder)
 {
-	*remainder = a % (INT64)b;
-	return a / (INT64)b;
+	INT32 res = div_64x32(a, b);
+	*remainder = a - ((INT64)b * res);
+	return res;
 }
 #endif
 
@@ -170,8 +171,9 @@ INLINE INT32 div_64x32_rem(INT64 a, INT32 b, INT32 *remainder)
 #ifndef divu_64x32_rem
 INLINE UINT32 divu_64x32_rem(UINT64 a, UINT32 b, UINT32 *remainder)
 {
-	*remainder = a % (UINT64)b;
-	return a / (UINT64)b;
+	UINT32 res = divu_64x32(a, b);
+	*remainder = a - ((UINT64)b * res);
+	return res;
 }
 #endif
 
@@ -212,7 +214,7 @@ INLINE UINT32 divu_32x32_shift(UINT32 a, UINT32 b, UINT8 shift)
 #ifndef mod_64x32
 INLINE INT32 mod_64x32(INT64 a, INT32 b)
 {
-	return a % (INT64)b;
+	return a - (b * div_64x32(a, b));
 }
 #endif
 
@@ -225,7 +227,7 @@ INLINE INT32 mod_64x32(INT64 a, INT32 b)
 #ifndef modu_64x32
 INLINE UINT32 modu_64x32(UINT64 a, UINT32 b)
 {
-	return a % (UINT64)b;
+	return a - (b * divu_64x32(a, b));
 }
 #endif