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90 lines
2 KiB
Lua
Executable file
90 lines
2 KiB
Lua
Executable file
#!/usr/bin/env luajit
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local ffi = require "ffi"
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local math = require "math"
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local os = require "os"
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local geom = require "geom"
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local xmath = require "xmath"
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local ldist = xmath.ldist
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local sqrt = math.sqrt
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local function printf(fmt, ...)
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print(string.format(fmt, ...))
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end
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local function edist(p1, p2)
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return sqrt(p1.x*p1.x + p2.x*p2.x)
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end
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-- z dummy is so that there's no error with xmath.rotate()
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local vec2 = ffi.typeof("struct { int32_t x, y, z /* dummy */; }")
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local numpoints = tonumber(arg[1]) or 1e4
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local Nsq = numpoints*numpoints
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printf("number of points: %d, testing %d distances", numpoints, Nsq)
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local B = 8192
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local pts = {}
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for i=1,numpoints do
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pts[i] = vec2(math.random(-B, B), math.random(B, -B))
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end
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-- test edist
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local t = os.clock()
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local sum = 0
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for i=1,numpoints do
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for j=1,numpoints do
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sum = sum+edist(pts[i], pts[j])
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end
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end
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t = os.clock()-t
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printf("edist: %.03fns per call, mean=%.03f", (1e9*t)/Nsq, sum/Nsq)
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-- test ldist
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t = os.clock()
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local sum = 0
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for i=1,numpoints do
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for j=1,numpoints do
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sum = sum+ldist(pts[i], pts[j])
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end
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end
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t = os.clock()-t
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printf("ldist: %.03fns per call, mean=%.03f", (1e9*t)/Nsq, sum/Nsq)
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-- test rotation
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t = os.clock()
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-- from control.lua (the CON version of rotatepoint)
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local function _rotatepoint(pivotx, pivoty, posx, posy, ang)
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local pos = geom.ivec3(posx, posy)
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local pivot = geom.ivec3(pivotx, pivoty)
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pos = xmath.rotate(pos, pivot, ang):toivec3()
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return pos.x, pos.y
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end
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sum = 0
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for i=1,numpoints do
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for j=1,numpoints do
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-- local p = xmath.rotate(pts[i], pts[j], j)
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-- sum = sum+p.x
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sum = sum + _rotatepoint(pts[j].x, pts[j].y, pts[i].x, pts[i].y, j)
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end
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end
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t = os.clock()-t
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printf("rotate: %.03fns per call", (1e9)/Nsq)
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-- Results (helixhorned x86, x86_64)
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-- number of points: 10000, testing 100000000 distances
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-- edist: 6.300ns per call, mean=6286.597
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-- ldist: 17.600ns per call, mean=8692.612
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-- rotate: 10.000ns per call [even with _rotatepoint()!]
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