Merge branch 'lukego/branchmarks'

bench/PARAM_x86_CI.txt

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+array3d 300
+binary-trees 16
+chameneos 1e7
+coroutine-ring 2e7
+euler14-bit 2e7
+fannkuch 11
+fasta 5e6
+life
+mandelbrot 5000
+mandelbrot-bit 5000
+md5 20000
+nbody 5e6
+nsieve 12
+nsieve-bit 12
+nsieve-bit-fp 12
+partialsums 1e7
+pidigits-nogmp 5000
+ray 9
+recursive-ack 10
+recursive-fib 40
+scimark-fft 50000
+scimark-lu 5000
+scimark-sor 50000
+scimark-sparse 15e4
+series 10000
+spectral-norm 3000
+roulette

bench/roulette.lua

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+-- Russian Roulette simulator
+-- This benchmark includes randomness from an external source that can
+-- produce non-deterministic performance.
+-- See https://github.com/LuaJIT/LuaJIT/issues/218
+
+-- (Let the test harness determine the random seed)
+-- math.randomseed(os.time())
+
+local population = 100e6
+local live = 0
+local die  = 0
+
+for i = 1, population do
+   if math.random(6) == 6 then
+      die = die + 1
+   else
+      live = live + 1
+   end
+end
+
+print(("Survived %d/%d (%.3f%%)"):format(live, population, live*100/(live+die)))