unimportant

time.lua

@@ -21,15 +21,15 @@ if ffi.os == 'Windows' then
 
 	function M.time()
 		C.time_GetSystemTimeAsFileTime(t)
-		return tonumber(t[0] - DELTA_EPOCH_IN_100NS) / 10^7
+		return tonumber(t[0] - DELTA_EPOCH_IN_100NS) * 1e-7
 	end
 
 	assert(C.time_QueryPerformanceFrequency(t) ~= 0)
-	local qpf = tonumber(t[0])
+	local inv_qpf = 1 / tonumber(t[0]) --precission loss in e-10
 
 	function M.clock()
 		assert(C.time_QueryPerformanceCounter(t) ~= 0)
-		return tonumber(t[0]) / qpf
+		return tonumber(t[0]) * inv_qpf
 	end
 
 	function M.sleep(s)
@@ -54,7 +54,7 @@ elseif ffi.os == 'Linux' or ffi.os == 'OSX' then
 	function M.sleep(s)
 		local int, frac = math.modf(s)
 		t.s = int
-		t.ns = frac * 10^9
+		t.ns = frac * 1e9
 		local ret = C.time_nanosleep(t, t)
 		while ret == -1 and ffi.errno() == EINTR do --interrupted
 			ret = C.time_nanosleep(t, t)
@@ -74,7 +74,7 @@ elseif ffi.os == 'Linux' or ffi.os == 'OSX' then
 		local clock_gettime = ffi.load'rt'.time_clock_gettime
 
 		local function tos(t)
-			return tonumber(t.s) + tonumber(t.ns) / 10^9
+			return tonumber(t.s) + tonumber(t.ns) / 1e9
 		end
 
 		function M.time()
@@ -109,14 +109,14 @@ elseif ffi.os == 'Linux' or ffi.os == 'OSX' then
 
 		function M.time()
 			assert(C.time_gettimeofday(t, nil) == 0)
-			return tonumber(t.s) + tonumber(t.us) / 10^6
+			return tonumber(t.s) + tonumber(t.us) * 1e-6
 		end
 
 		--NOTE: this appears to be pointless on Intel Macs. The timebase fraction
 		--is always 1/1 and mach_absolute_time() does dynamic scaling internally.
 		local timebase = ffi.new'time_mach_timebase_info_data_t'
 		assert(C.time_mach_timebase_info(timebase) == 0)
-		local scale = tonumber(timebase.numer) / tonumber(timebase.denom) / 10^9
+		local scale = tonumber(timebase.numer) / tonumber(timebase.denom) / 1e9
 		function M.clock()
 			return tonumber(C.time_mach_absolute_time()) * scale
 		end
@@ -125,6 +125,7 @@ elseif ffi.os == 'Linux' or ffi.os == 'OSX' then
 
 end --Linux or OSX
 
+
 if not ... then
 	io.stdout:setvbuf'no'
 	local time = M
@@ -141,12 +142,13 @@ if not ... then
 			time.sleep(ss)
 		end
 		local t1 = time.clock()
-		print(string.format('  missed by: %0.2fms', (t1 - t0 - s) * 1000))
+		print(string.format('  missed by: %0.2fms', (t1 - t0 - s) / times * 1000))
 	end
 
 	test_sleep(0.001, 0.001)
 	test_sleep(0.2, 0.02)
 	test_sleep(2, 0.2)
 end
 
+
 return M