[PATCH] ARM: 2723/2: remove __udivdi3 and __umoddi3 from the kernel

Patch from Nicolas Pitre

Those are big, slow and generally not recommended for kernel code.
They are even not present on i386.  So it should be concluded that
one could as well get away with do_div() alone.

Signed-off-by: Nicolas Pitre <nico@cam.org>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 0 insertions, 222 deletions

diff --git a/arch/arm/lib/udivdi3.c b/arch/arm/lib/udivdi3.c
deleted file mode 100644
index e343be4c6642..000000000000
--- a/arch/arm/lib/udivdi3.c
+++ /dev/null
@@ -1,222 +0,0 @@
-/* More subroutines needed by GCC output code on some machines.  */
-/* Compile this one with gcc.  */
-/* Copyright (C) 1989, 92-98, 1999 Free Software Foundation, Inc.
-
-This file is part of GNU CC.
-
-GNU CC is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU CC is distributed in the hope that it will be useful,
-but WITHOUT ANY WARRANTY; without even the implied warranty of
-MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-GNU General Public License for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU CC; see the file COPYING.  If not, write to
-the Free Software Foundation, 59 Temple Place - Suite 330,
-Boston, MA 02111-1307, USA.  */
-
-/* As a special exception, if you link this library with other files,
-   some of which are compiled with GCC, to produce an executable,
-   this library does not by itself cause the resulting executable
-   to be covered by the GNU General Public License.
-   This exception does not however invalidate any other reasons why
-   the executable file might be covered by the GNU General Public License.
- */
-/* support functions required by the kernel. based on code from gcc-2.95.3 */
-/* I Molton     29/07/01 */
-
-#include "gcclib.h"
-#include "longlong.h"
-
-static const u8 __clz_tab[] = {
-	0, 1, 2, 2, 3, 3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5,
-	    5, 5, 5, 5, 5, 5, 5, 5,
-	6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6,
-	    6, 6, 6, 6, 6, 6, 6, 6,
-	7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
-	    7, 7, 7, 7, 7, 7, 7, 7,
-	7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
-	    7, 7, 7, 7, 7, 7, 7, 7,
-	8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-	    8, 8, 8, 8, 8, 8, 8, 8,
-	8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-	    8, 8, 8, 8, 8, 8, 8, 8,
-	8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-	    8, 8, 8, 8, 8, 8, 8, 8,
-	8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
-	    8, 8, 8, 8, 8, 8, 8, 8,
-};
-
-u64 __udivmoddi4(u64 n, u64 d, u64 * rp)
-{
-	DIunion ww;
-	DIunion nn, dd;
-	DIunion rr;
-	u32 d0, d1, n0, n1, n2;
-	u32 q0, q1;
-	u32 b, bm;
-
-	nn.ll = n;
-	dd.ll = d;
-
-	d0 = dd.s.low;
-	d1 = dd.s.high;
-	n0 = nn.s.low;
-	n1 = nn.s.high;
-
-	if (d1 == 0) {
-		if (d0 > n1) {
-			/* 0q = nn / 0D */
-
-			count_leading_zeros(bm, d0);
-
-			if (bm != 0) {
-				/* Normalize, i.e. make the most significant bit of the
-				   denominator set.  */
-
-				d0 = d0 << bm;
-				n1 = (n1 << bm) | (n0 >> (SI_TYPE_SIZE - bm));
-				n0 = n0 << bm;
-			}
-
-			udiv_qrnnd(q0, n0, n1, n0, d0);
-			q1 = 0;
-
-			/* Remainder in n0 >> bm.  */
-		} else {
-			/* qq = NN / 0d */
-
-			if (d0 == 0)
-				d0 = 1 / d0;	/* Divide intentionally by zero.  */
-
-			count_leading_zeros(bm, d0);
-
-			if (bm == 0) {
-				/* From (n1 >= d0) /\ (the most significant bit of d0 is set),
-				   conclude (the most significant bit of n1 is set) /\ (the
-				   leading quotient digit q1 = 1).
-
-				   This special case is necessary, not an optimization.
-				   (Shifts counts of SI_TYPE_SIZE are undefined.)  */
-
-				n1 -= d0;
-				q1 = 1;
-			} else {
-				/* Normalize.  */
-
-				b = SI_TYPE_SIZE - bm;
-
-				d0 = d0 << bm;
-				n2 = n1 >> b;
-				n1 = (n1 << bm) | (n0 >> b);
-				n0 = n0 << bm;
-
-				udiv_qrnnd(q1, n1, n2, n1, d0);
-			}
-
-			/* n1 != d0...  */
-
-			udiv_qrnnd(q0, n0, n1, n0, d0);
-
-			/* Remainder in n0 >> bm.  */
-		}
-
-		if (rp != 0) {
-			rr.s.low = n0 >> bm;
-			rr.s.high = 0;
-			*rp = rr.ll;
-		}
-	} else {
-		if (d1 > n1) {
-			/* 00 = nn / DD */
-
-			q0 = 0;
-			q1 = 0;
-
-			/* Remainder in n1n0.  */
-			if (rp != 0) {
-				rr.s.low = n0;
-				rr.s.high = n1;
-				*rp = rr.ll;
-			}
-		} else {
-			/* 0q = NN / dd */
-
-			count_leading_zeros(bm, d1);
-			if (bm == 0) {
-				/* From (n1 >= d1) /\ (the most significant bit of d1 is set),
-				   conclude (the most significant bit of n1 is set) /\ (the
-				   quotient digit q0 = 0 or 1).
-
-				   This special case is necessary, not an optimization.  */
-
-				/* The condition on the next line takes advantage of that
-				   n1 >= d1 (true due to program flow).  */
-				if (n1 > d1 || n0 >= d0) {
-					q0 = 1;
-					sub_ddmmss(n1, n0, n1, n0, d1, d0);
-				} else
-					q0 = 0;
-
-				q1 = 0;
-
-				if (rp != 0) {
-					rr.s.low = n0;
-					rr.s.high = n1;
-					*rp = rr.ll;
-				}
-			} else {
-				u32 m1, m0;
-				/* Normalize.  */
-
-				b = SI_TYPE_SIZE - bm;
-
-				d1 = (d1 << bm) | (d0 >> b);
-				d0 = d0 << bm;
-				n2 = n1 >> b;
-				n1 = (n1 << bm) | (n0 >> b);
-				n0 = n0 << bm;
-
-				udiv_qrnnd(q0, n1, n2, n1, d1);
-				umul_ppmm(m1, m0, q0, d0);
-
-				if (m1 > n1 || (m1 == n1 && m0 > n0)) {
-					q0--;
-					sub_ddmmss(m1, m0, m1, m0, d1, d0);
-				}
-
-				q1 = 0;
-
-				/* Remainder in (n1n0 - m1m0) >> bm.  */
-				if (rp != 0) {
-					sub_ddmmss(n1, n0, n1, n0, m1, m0);
-					rr.s.low = (n1 << b) | (n0 >> bm);
-					rr.s.high = n1 >> bm;
-					*rp = rr.ll;
-				}
-			}
-		}
-	}
-
-	ww.s.low = q0;
-	ww.s.high = q1;
-	return ww.ll;
-}
-
-u64 __udivdi3(u64 n, u64 d)
-{
-	return __udivmoddi4(n, d, (u64 *) 0);
-}
-
-u64 __umoddi3(u64 u, u64 v)
-{
-	u64 w;
-
-	(void)__udivmoddi4(u, v, &w);
-
-	return w;
-}