aboutsummaryrefslogtreecommitdiff
path: root/arch/mn10300/lib/__lshrdi3.S
diff options
context:
space:
mode:
Diffstat (limited to 'arch/mn10300/lib/__lshrdi3.S')
-rw-r--r--arch/mn10300/lib/__lshrdi3.S52
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/mn10300/lib/__lshrdi3.S b/arch/mn10300/lib/__lshrdi3.S
new file mode 100644
index 000000000000..a686aef31e90
--- /dev/null
+++ b/arch/mn10300/lib/__lshrdi3.S
@@ -0,0 +1,52 @@
+/* MN10300 64-bit logical right shift
+ *
+ * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
+ * Written by David Howells (dhowells@redhat.com)
+ *
+ * This program 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 of the Licence, or (at your option) any later version.
+ */
+
+#include <asm/cache.h>
+
+ .text
+ .balign L1_CACHE_BYTES
+
+###############################################################################
+#
+# unsigned long long __lshrdi3(unsigned long long value [D1:D0],
+# unsigned by [(12,SP)])
+#
+###############################################################################
+ .globl __lshrdi3
+ .type __lshrdi3,@function
+__lshrdi3:
+ mov (12,sp),a0
+ and +63,a0
+ beq __lshrdi3_zero
+
+ cmp +31,a0
+ bhi __lshrdi3_32plus
+
+ # the count is in the range 1-31
+ lsr a0,d0
+
+ mov +32,a1
+ sub a0,a1,a1 # a1 = 32 - count
+ asl a1,d1,a1 # get underflow from MSW -> LSW
+
+ or_lsr a1,d0,a0,d1 # insert underflow into LSW and
+ # shift the MSW
+ rets
+
+ .balign L1_CACHE_BYTES
+ # the count is in the range 32-63
+__lshrdi3_32plus:
+ lsr a0,d1,d0
+ clr d1
+__lshrdi3_zero:
+ rets
+
+ .size __lshrdi3, .-__lshrdi3