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96 lines
3.2 KiB
96 lines
3.2 KiB
-- fpconv tests
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context("Fpconv printf functions", function()
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local ffi = require("ffi")
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local u = require "rspamd_util"
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local niter_fuzz = 100000
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local function small_double()
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return math.random()
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end
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local function large_double()
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return math.random() * math.random(2^52)
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end
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local function huge_double()
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return math.random(2^52) * math.random(2^52)
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end
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local function tiny_double()
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return math.random() / math.random(2^52)
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end
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ffi.cdef[[
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int snprintf(char *str, size_t size, const char *format, ...);
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long rspamd_snprintf(char *str, size_t size, const char *format, ...);
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long rspamd_printf(const char *format, ...);
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]]
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local benchmarks = {
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{'tiny fixed', small_double, '%f'},
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{'small fixed', tiny_double, '%f'},
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{'large fixed', large_double, '%.3f'},
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{'huge fixed', huge_double, '%.3f'},
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{'tiny scientific', small_double, '%g'},
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{'small scientific', tiny_double, '%g'},
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{'large scientific', large_double, '%g'},
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{'huge scientific', huge_double, '%g'},
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}
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local generic = {
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{0, '%f', '0'},
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{0, '%.1f', '0.0'},
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{0, '%.2f', '0.00'},
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{0, '%.32f', '0.000000000000000000000000000'}, -- max
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{0, '%.150f', '0.000000000000000000000000000'}, -- too large
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{1/3, '%f', '0.3333333333333333'},
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{1/3, '%.1f', '0.3'},
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{1/3, '%.2f', '0.33'},
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{-1/3, '%.32f', '-0.333333333333333300000000000'},
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{-1/3, '%.150f', '-0.333333333333333300000000000'},
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{-3.6817595395344857e-68, '%f', '-3.6817595395344857e-68'},
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{3.5844466002796428e+298, '%f', '3.5844466002796428e+298'},
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{9223372036854775808, '%f', '9223372036854776000'}, -- 2^63 with precision lost
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{2^50 + 0.2, '%f', '1125899906842624.3'}, -- 2^50 with precision lost
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{2^50 + 0.2, '%.2f', '1125899906842624.30'}, -- 2^50 with precision lost
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{-3.6817595395344857e-68, '%.3f', '-0.000'}, -- not enough precision
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{3.5844466002796428e+298, '%.3f', '3.5844466002796428e+298'},
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{9223372036854775808, '%.3f', '9223372036854776000.000'}, -- 2^63 with precision lost
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{math.huge, '%f', 'inf'},
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{-math.huge, '%f', '-inf'},
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{0.0/0.0, '%f', 'nan'},
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{math.huge, '%.1f', 'inf'},
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{-math.huge, '%.2f', '-inf'},
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{0.0/0.0, '%.3f', 'nan'},
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{math.huge, '%g', 'inf'},
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{-math.huge, '%g', '-inf'},
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{0.0/0.0, '%g', 'nan'},
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}
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local buf = ffi.new("char[64]")
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local buf2 = ffi.new("char[64]")
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for i,c in ipairs(generic) do
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test("Generic fp test fmt: " .. c[2] .. '; ' .. tostring(c[1]), function()
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ffi.C.rspamd_snprintf(buf, 64, c[2], c[1])
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local sbuf = ffi.string(buf)
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assert_equal(sbuf, c[3], c[3] .. " but test returned " .. sbuf)
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end)
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end
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for i,c in ipairs(benchmarks) do
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test("Fuzz fp test " .. c[1], function()
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for _=1,niter_fuzz do
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local sign = 1
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if math.random() > 0.5 then
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sign = -1
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end
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local d = c[2]() * sign
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ffi.C.snprintf(buf, 64, c[3], d)
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ffi.C.rspamd_snprintf(buf2, 64, c[3], d)
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local sbuf = ffi.string(buf)
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local sbuf2 = ffi.string(buf2)
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assert_less_than(math.abs(d - tonumber(sbuf2))/math.abs(d),
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0.00001,
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string.format('rspamd emitted: %s, libc emitted: %s, original number: %g',
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sbuf2, sbuf, d))
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end
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end)
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end
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end)
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