patch-2.4.13 linux/arch/arm/lib/muldi3.c

• Lines: 78
• Date: Thu Oct 11 09:04:57 2001
• Orig file: v2.4.12/linux/arch/arm/lib/muldi3.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.12/linux/arch/arm/lib/muldi3.c linux/arch/arm/lib/muldi3.c
@@ -0,0 +1,77 @@
+/* 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"
+
+#define umul_ppmm(xh, xl, a, b) \
+{register USItype __t0, __t1, __t2;                                     \
+  __asm__ ("%@ Inlined umul_ppmm
+        mov     %2, %5, lsr #16
+        mov     %0, %6, lsr #16
+        bic     %3, %5, %2, lsl #16
+        bic     %4, %6, %0, lsl #16
+        mul     %1, %3, %4
+        mul     %4, %2, %4
+        mul     %3, %0, %3
+        mul     %0, %2, %0
+        adds    %3, %4, %3
+        addcs   %0, %0, #65536
+        adds    %1, %1, %3, lsl #16
+        adc     %0, %0, %3, lsr #16"                                    \
+           : "=&r" ((USItype) (xh)),                                    \
+             "=r" ((USItype) (xl)),                                     \
+             "=&r" (__t0), "=&r" (__t1), "=r" (__t2)                    \
+           : "r" ((USItype) (a)),                                       \
+             "r" ((USItype) (b)));}
+
+
+#define __umulsidi3(u, v) \
+  ({DIunion __w;                                                        \
+    umul_ppmm (__w.s.high, __w.s.low, u, v);                            \
+    __w.ll; })
+
+
+DItype
+__muldi3 (DItype u, DItype v)
+{
+  DIunion w;
+  DIunion uu, vv;
+
+  uu.ll = u,
+  vv.ll = v;
+
+  w.ll = __umulsidi3 (uu.s.low, vv.s.low);
+  w.s.high += ((USItype) uu.s.low * (USItype) vv.s.high
+               + (USItype) uu.s.high * (USItype) vv.s.low);
+
+  return w.ll;
+}
+