Author: Sven Hager <hager.s...@googlemail.com>
Branch: extradoc
Changeset: r4434:b64173fab118
Date: 2012-08-07 01:50 +0200
http://bitbucket.org/pypy/extradoc/changeset/b64173fab118/
Log: port sqrt benchmark to lua
diff --git a/talk/iwtc11/benchmarks/sqrt/sqrt.lua
b/talk/iwtc11/benchmarks/sqrt/sqrt.lua
new file mode 100644
--- /dev/null
+++ b/talk/iwtc11/benchmarks/sqrt/sqrt.lua
@@ -0,0 +1,89 @@
+function sqrt(y, n)
+ n = n or 10000
+ x = y / 2
+ while n > 0 do
+ n = n - 1
+ x = (x + y/x) / 2
+ end
+ return x
+end
+
+-----------------------
+-- begin class Fix16 --
+-----------------------
+
+Fix16 = {}
+Fix16.__index = Fix16
+
+function Fix16.init(val, scale)
+ if scale == nil then
+ scale = true
+ end
+
+ local fix16 = {}
+ setmetatable(fix16, Fix16)
+ if type(val) == "table" then
+ fix16.val = val.val
+ else
+ if scale == true then
+ fix16.val = math.floor(val * (2 ^ 16))
+ else
+ fix16.val = val
+ end
+ end
+ return fix16
+end
+
+function Fix16:__add(other)
+ return Fix16.init(self.val + Fix16.init(other).val, false)
+end
+
+function Fix16:__mul(other)
+ value = (self.val / 256) * (Fix16.init(other).val / 256)
+ return Fix16.init(value, false)
+end
+
+function Fix16:__div(other)
+ value = (self.val * 256) / (Fix16.init(other).val / 256)
+ return Fix16.init(value, false)
+end
+
+function Fix16:to_float()
+ return self.val / (2 ^ 16)
+end
+
+function Fix16:__tostring()
+ return tostring(self:to_float())
+end
+
+---------------------
+-- end class Fix16 --
+---------------------
+
+function test_sqrt()
+ t = {2, 3, 4, 5, 6, 7, 8, 9, 123}
+ for j = 1, #t do
+ i = t[j]
+ s = string.format("%d %f %4.2f %4.2f %4.2f", i, sqrt(i),
sqrt(i), sqrt(Fix16.init(i)):to_float(), math.sqrt(i))
+ print(s)
+ end
+end
+
+-- entry point
+function main(args)
+ arg = args[1]
+ if arg == "int" then
+ sqrt(123, 100000000)
+ elseif arg == "float" then
+ sqrt(123, 100000000)
+ elseif arg == "Fix16" then
+ sqrt(Fix16.init(123), 100000000)
+ elseif arg == "test_sqrt" then
+ test_sqrt()
+ else
+ error('argument must be "int", "float" or "Fix16"')
+ end
+ return string.format("%s", arg)
+end
+
+--main(arg)
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