summaryrefslogtreecommitdiff
path: root/Build/source/libs/gmp/gmp-6.0.0/mpn/alpha/ev6/nails/README
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/libs/gmp/gmp-6.0.0/mpn/alpha/ev6/nails/README')
-rw-r--r--Build/source/libs/gmp/gmp-6.0.0/mpn/alpha/ev6/nails/README65
1 files changed, 65 insertions, 0 deletions
diff --git a/Build/source/libs/gmp/gmp-6.0.0/mpn/alpha/ev6/nails/README b/Build/source/libs/gmp/gmp-6.0.0/mpn/alpha/ev6/nails/README
new file mode 100644
index 00000000000..b214ac50adb
--- /dev/null
+++ b/Build/source/libs/gmp/gmp-6.0.0/mpn/alpha/ev6/nails/README
@@ -0,0 +1,65 @@
+Copyright 2002, 2005 Free Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of either:
+
+ * the GNU Lesser General Public License as published by the Free
+ Software Foundation; either version 3 of the License, or (at your
+ option) any later version.
+
+or
+
+ * the GNU General Public License as published by the Free Software
+ Foundation; either version 2 of the License, or (at your option) any
+ later version.
+
+or both in parallel, as here.
+
+The GNU MP Library 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 copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library. If not,
+see https://www.gnu.org/licenses/.
+
+
+
+
+
+This directory contains assembly code for nails-enabled 21264. The code is not
+very well optimized.
+
+For addmul_N, as N grows larger, we could make multiple loads together, then do
+about 3.3 i/c. 10 cycles after the last load, we can increase to 4 i/c. This
+would surely allow addmul_4 to run at 2 c/l, but the same should be possible
+also for addmul_3 and perhaps even addmul_2.
+
+
+ current fair best
+Routine c/l unroll c/l unroll c/l i/c
+mul_1 3.25 2.75 2.75 3.273
+addmul_1 4.0 4 3.5 4 14 3.25 3.385
+addmul_2 4.0 1 2.5 2 10 2.25 3.333
+addmul_3 3.0 1 2.33 2 14 2 3.333
+addmul_4 2.5 1 2.125 2 17 2 3.135
+
+addmul_5 2 1 10
+addmul_6 2 1 12
+addmul_7 2 1 14
+
+(The "best" column doesn't account for bookkeeping instructions and
+thereby assumes infinite unrolling.)
+
+Basecase usages:
+
+1 addmul_1
+2 addmul_2
+3 addmul_3
+4 addmul_4
+5 addmul_3 + addmul_2 2.3998
+6 addmul_4 + addmul_2
+7 addmul_4 + addmul_3