patch-2.4.0-test12 linux/include/asm-parisc/div64.h

• Lines: 55
• Date: Tue Dec 5 12:29:39 2000
• Orig file: v2.4.0-test11/linux/include/asm-parisc/div64.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test11/linux/include/asm-parisc/div64.h linux/include/asm-parisc/div64.h
@@ -0,0 +1,54 @@
+#ifndef __ASM_PARISC_DIV64
+#define __ASM_PARISC_DIV64
+
+#ifdef __LP64__
+
+/*
+ * Copyright (C) 1999 Hewlett-Packard Co
+ * Copyright (C) 1999 David Mosberger-Tang <davidm@hpl.hp.com>
+ *
+ * vsprintf uses this to divide a 64-bit integer N by a small integer BASE.
+ * This is incredibly hard on IA-64 and HPPA
+ */
+
+#define do_div(n,base)						\
+({								\
+	int _res;						\
+	_res = ((unsigned long) (n)) % (unsigned) (base);	\
+	(n) = ((unsigned long) (n)) / (unsigned) (base);	\
+	_res;							\
+})
+
+#else
+/*
+ * unsigned long long division.  Yuck Yuck!  What is Linux coming to?
+ * This is 100% disgusting
+ */
+#define do_div(n,base)							\
+({									\
+	unsigned long __low, __low2, __high, __rem;			\
+	__low  = (n) & 0xffffffff;					\
+	__high = (n) >> 32;						\
+	if (__high) {							\
+		__rem   = __high % (unsigned long)base;			\
+		__high  = __high / (unsigned long)base;			\
+		__low2  = __low >> 16;					\
+		__low2 += __rem << 16;					\
+		__rem   = __low2 % (unsigned long)base;			\
+		__low2  = __low2 / (unsigned long)base;			\
+		__low   = __low & 0xffff;				\
+		__low  += __rem << 16;					\
+		__rem   = __low  % (unsigned long)base;			\
+		__low   = __low  / (unsigned long)base;			\
+		n = __low  + ((long long)__low2 << 16) +		\
+			((long long) __high << 32);			\
+	} else {							\
+		__rem = __low % (unsigned long)base;			\
+		n = (__low / (unsigned long)base);			\
+	}								\
+	__rem;								\
+})
+#endif
+
+#endif
+