aboutsummaryrefslogtreecommitdiff
path: root/arch/mn10300/lib/ashrdi3.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mn10300/lib/ashrdi3.c')
-rw-r--r--arch/mn10300/lib/ashrdi3.c61
1 files changed, 61 insertions, 0 deletions
diff --git a/arch/mn10300/lib/ashrdi3.c b/arch/mn10300/lib/ashrdi3.c
new file mode 100644
index 00000000000..c54f61ddf0b
--- /dev/null
+++ b/arch/mn10300/lib/ashrdi3.c
@@ -0,0 +1,61 @@
+/* ashrdi3.c extracted from gcc-2.7.2/libgcc2.c which is: */
+/* Copyright (C) 1989, 1992, 1993, 1994, 1995 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 Licence 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 Licence for more details.
+
+You should have received a copy of the GNU General Public Licence
+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. */
+
+#define BITS_PER_UNIT 8
+
+typedef int SItype __attribute__((mode(SI)));
+typedef unsigned int USItype __attribute__((mode(SI)));
+typedef int DItype __attribute__((mode(DI)));
+typedef int word_type __attribute__((mode(__word__)));
+
+struct DIstruct {
+ SItype low;
+ SItype high;
+};
+
+union DIunion {
+ struct DIstruct s;
+ DItype ll;
+};
+
+DItype __ashrdi3(DItype u, word_type b)
+{
+ union DIunion w;
+ union DIunion uu;
+ word_type bm;
+
+ if (b == 0)
+ return u;
+
+ uu.ll = u;
+
+ bm = (sizeof(SItype) * BITS_PER_UNIT) - b;
+ if (bm <= 0) {
+ /* w.s.high = 1..1 or 0..0 */
+ w.s.high = uu.s.high >> (sizeof(SItype) * BITS_PER_UNIT - 1);
+ w.s.low = uu.s.high >> -bm;
+ } else {
+ USItype carries = (USItype)uu.s.high << bm;
+ w.s.high = uu.s.high >> b;
+ w.s.low = ((USItype)uu.s.low >> b) | carries;
+ }
+
+ return w.ll;
+}