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authorwdenk <wdenk>2003-10-08 23:26:14 +0000
committerwdenk <wdenk>2003-10-08 23:26:14 +0000
commit4a5517094dd30bb1f271403b62e23053301668e6 (patch)
tree55bd5e64828e7645caa5506302e27715cfecdbda /lib_nios/divmod.c
parent54387ac931fa7cc92cd45c53798379af1f9adc44 (diff)
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* Patch by Scott McNutt, 04 Oct 2003:
- add support for Altera Nios-32 CPU - add support for Nios Cyclone Development Kit (DK-1C20) * Patch by Steven Scholz, 29 Sep 2003: - A second parameter for bootm overwrites the load address for "Standalone Application" images. - bootm sets environment variable "filesize" to the resulting (uncompressed) data length for "Standalone Application" images when autostart is set to "no". Now you can do something like if bootm $fpgadata $some_free_ram ; then fpga load 0 $some_free_ram $filesize fi * Patch by Denis Peter, 25 Sept 2003: add support for the MIP405 Rev. C board
Diffstat (limited to 'lib_nios/divmod.c')
-rw-r--r--lib_nios/divmod.c101
1 files changed, 101 insertions, 0 deletions
diff --git a/lib_nios/divmod.c b/lib_nios/divmod.c
new file mode 100644
index 0000000..3c7e71e
--- /dev/null
+++ b/lib_nios/divmod.c
@@ -0,0 +1,101 @@
+/*
+ * 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.
+ */
+
+
+#include "math.h"
+
+USItype udivmodsi4 (USItype num, USItype den, word_type modwanted)
+{
+ USItype bit = 1;
+ USItype res = 0;
+
+ while (den < num && bit && !(den & (1L << 31))) {
+ den <<= 1;
+ bit <<= 1;
+ }
+ while (bit) {
+ if (num >= den) {
+ num -= den;
+ res |= bit;
+ }
+ bit >>= 1;
+ den >>= 1;
+ }
+ if (modwanted)
+ return num;
+ return res;
+}
+
+
+SItype __divsi3 (SItype a, SItype b)
+{
+ word_type neg = 0;
+ SItype res;
+
+ if (a < 0) {
+ a = -a;
+ neg = !neg;
+ }
+
+ if (b < 0) {
+ b = -b;
+ neg = !neg;
+ }
+
+ res = udivmodsi4 (a, b, 0);
+
+ if (neg)
+ res = -res;
+
+ return res;
+}
+
+
+SItype __modsi3 (SItype a, SItype b)
+{
+ word_type neg = 0;
+ SItype res;
+
+ if (a < 0) {
+ a = -a;
+ neg = 1;
+ }
+
+ if (b < 0)
+ b = -b;
+
+ res = udivmodsi4 (a, b, 1);
+
+ if (neg)
+ res = -res;
+
+ return res;
+}
+
+
+SItype __udivsi3 (SItype a, SItype b)
+{
+ return udivmodsi4 (a, b, 0);
+}
+
+
+SItype __umodsi3 (SItype a, SItype b)
+{
+ return udivmodsi4 (a, b, 1);
+}