vmath/tests/bench_isNan.nim

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2021-05-29 17:55:46 +00:00
import benchy, vmath
proc isNaNSlow(f: SomeFloat): bool =
## Returns true if number is a NaN.
f.classify notin {fcNormal, fcZero, fcSubnormal}
proc isNaNRyan(x: SomeFloat): bool =
if x == 0.0:
return false
x != x or x * 0.5 == x
proc isNaN3*(x: SomeFloat): bool =
## Returns true if number is a NaN.
x != 0.0 and (x != x or x * 0.5 == x)
assert isNaNSlow(0.3) == false
assert isNaNSlow(0.0) == false
assert isNaNSlow(0.3/0.0) == true
assert isNaNSlow(-0.3/0.0) == true
assert isNaNSlow(5.0e-324) == false
assert isNaNRyan(0.3) == false
assert isNaNRyan(0.0) == false
assert isNaNRyan(0.3/0.0) == true
assert isNaNRyan(-0.3/0.0) == true
assert isNaNRyan(5.0e-324) == false
assert isNan(float32(0.3)) == false
assert isNan(float32(0.0)) == false
assert isNan(float32(0.3/0.0)) == true
assert isNan(float32(-0.3/0.0)) == true
assert isNan(float32(5.0e-324)) == false
assert isNan(float64(0.3)) == false
assert isNan(float64(0.0)) == false
assert isNan(float64(0.3/0.0)) == true
assert isNan(float64(-0.3/0.0)) == true
assert isNan(float64(5.0e-324)) == false
assert isNan3(float32(0.3)) == false
assert isNan3(float32(0.0)) == false
assert isNan3(float32(0.3/0.0)) == true
assert isNan3(float32(-0.3/0.0)) == true
assert isNan3(float32(5.0e-324)) == false
assert isNan3(float64(0.3)) == false
assert isNan3(float64(0.0)) == false
assert isNan3(float64(0.3/0.0)) == true
assert isNan3(float64(-0.3/0.0)) == true
assert isNan3(float64(5.0e-324)) == false
const num = 1_00_000
timeIt "isNaNSlow float32":
var x: float32
var n = 0
for i in 0 .. num:
if x.isNaNSlow:
n += 1
x = float32(i) / float32(i)
keep n
timeIt "isNaNSlow float64":
var x: float64
var n = 0
for i in 0 .. num:
if x.isNaNSlow:
n += 1
x = float64(i) / float64(i)
keep n
timeIt "isNaNRyan float32":
var x: float32
var n = 0
for i in 0 .. num:
if x.isNaNRyan:
n += 1
x = float32(i) / float32(i)
keep n
timeIt "isNaNRyan float64":
var x: float64
var n = 0
for i in 0 .. num:
if x.isNaNRyan:
n += 1
x = float64(i) / float64(i)
keep n
timeIt "isNan float32":
var x: float32
var n = 0
for i in 0 .. num:
if x.isNan:
n += 1
x = float32(i) / float32(i)
keep n
timeIt "isNan float64":
var x: float64
var n = 0
for i in 0 .. num:
if x.isNan:
n += 1
x = float64(i) / float64(i)
keep n
timeIt "isNan3 float32":
var x: float32
var n = 0
for i in 0 .. num:
if x.isNan3:
n += 1
x = float32(i) / float32(i)
keep n
timeIt "isNan3 float64":
var x: float64
var n = 0
for i in 0 .. num:
if x.isNan3:
n += 1
x = float64(i) / float64(i)
keep n