ref: 5a95abf7cc557ebccb3aa80c8ce9679eb82dcaa1
dir: /lib/std/test/fltbits.myr/
use std
use testr
use math
const main = {
math.fptrap(false)
testr.run([
[.name = "isnan", .fn = isnan01],
[.name = "bits-roundtrip-32", .fn = bitsround32],
[.name = "bits-roundtrip-64", .fn = bitsround64],
[.name = "flt32bits", .fn = flt32bits],
[.name = "flt64bits", .fn = flt64bits],
[.name = "explode-roundtrip-32", .fn = exploderound32],
[.name = "explode-roundtrip-64", .fn = exploderound64],
][:])
}
const isnan01 = {c
testr.check(c, std.isnan(std.flt64nan()), "std.flt64nan() should give a NaN")
testr.check(c, std.isnan(std.flt32nan()), "std.flt32nan() should give a NaN")
/*
a NaN should be {any sign bit}, then {8 or 11 exponent
bits, all 1}, then {any non-zero sequence of 23 or 52
bits}
*/
testr.check(c, std.isnan(std.flt64frombits(0xfff0000500000000ul)), "0xfff0000500000000 should be a NaN")
testr.check(c, std.isnan(std.flt64frombits(0x7ff0000500000000ul)), "0x7ff0000500000000 should be a NaN")
testr.check(c, std.isnan(std.flt32frombits(0xff800090)), "0xff800090 should be a NaN")
testr.check(c, std.isnan(std.flt32frombits(0x7f800090)), "0x7f800090 should be a NaN")
/* if the significand bits are all 0, it's an infinity instead */
testr.check(c, !std.isnan(std.flt64frombits(0x7ff0000000000000ul)), "Infinities[1] should not be NaNs")
testr.check(c, !std.isnan(std.flt64frombits(0xfff0000000000000ul)), "Infinities[2] should not be NaNs")
testr.check(c, !std.isnan(std.flt32frombits(0xff800000)), "Infinities[3] should not be NaNs")
testr.check(c, !std.isnan(std.flt32frombits(0x7f800000)), "Infinities[4] should not be NaNs")
}
const bitsround32 = {c
for f : [1.0, 0.00001, 123.45, 1111111111111111.2, -1.9, -0.0001][:]
var g = std.flt32frombits(std.flt32bits(f))
testr.check(c, f == g, "flt -> bits -> flt non-identity: {} != {}", f, g)
;;
for u : [0x7af80000, 0x12ab9800, 0x00000000, 0x00000001, 0x80000000, 0xc8903aa5][:]
var v = std.flt32bits(std.flt32frombits(u))
testr.check(c, u == v, "bits -> flt -> bits non-identity: {} != {}", u, v)
;;
var nan_f = std.flt32frombits(0xff800090)
var nan_g = std.flt32frombits(std.flt32bits(nan_f))
testr.check(c, nan_f == nan_g, "flt -> bits -> flt non-identity for nan")
var inf_f = std.flt32frombits(0x7f800000)
var inf_g = std.flt32frombits(std.flt32bits(inf_f))
testr.check(c, inf_f == inf_g, "flt -> bits -> flt non-identity for inf")
}
const bitsround64 = {c
for f : [1.0, 0.00001, 123.45, 1111111111111111.2, -1.9, -0.0001][:]
var g = std.flt64frombits(std.flt64bits(f))
testr.check(c, f == g, "flt -> bits -> flt non-identity: {} != {}", f, g)
;;
for u : [0x7ff3330a00120809, 0x0000000000000000, 0x0000000000000001, 0xffffff0000000001][:]
var v = std.flt64bits(std.flt64frombits(u))
testr.check(c, u == v, "bits -> flt -> bits non-identity: {} != {}", u, v)
;;
var nan_f = std.flt64frombits(0x7ff000000000a000ul)
var nan_g = std.flt64frombits(std.flt64bits(nan_f))
testr.check(c, nan_f == nan_g, "flt -> bits -> flt non-identity for nan")
var inf_f = std.flt64frombits(0xfff0000000000000ul)
var inf_g = std.flt64frombits(std.flt64bits(inf_f))
testr.check(c, inf_f == inf_g, "flt -> bits -> flt non-identity for inf")
}
const flt32bits = {c
for (f, u) : [
(2.0, 0x40000000),
(1.0, 0x3f800000),
(0.0000123, 0x374e5c19),
(-993.83, 0xc478751f),
(0.000000000000000000000000000000000000006054601, 0x0041edc4),
][:]
var uprime = std.flt32bits(f)
testr.check(c, u == uprime, "flt32bits wrong for {}: 0x{x} != 0x{x}", f, u, uprime)
;;
}
const flt64bits = {c
for (f, u) : [
(2.0, 0x4000000000000000ul),
(1.0, 0x3ff0000000000000ul),
(0.0000123, 0x3ee9cb8320b15070ul),
(-993.83, 0xc08f0ea3d70a3d71ul),
][:]
var uprime = std.flt64bits(f)
testr.check(c, u == uprime, "flt64bits wrong for {}: 0x{x} != 0x{x}", f, u, uprime)
;;
}
const exploderound32 = {c
var vals
vals = [1.0, 0.00001, 123.45, 1111111111111111.2, -1.9, -0.0001, 0.000000000000000000000000000000000000006054601, std.flt32nan()][:]
for f : vals
var n, e, s
(n, e, s) = std.flt32explode(f)
var g = std.flt32assem(n, e, s)
testr.check(c, f == g, "assem o explode non-identity: {} != {}", f, g)
;;
/*
The exponents and significands need to be rather specific
in order for flt32assem to work as expected
*/
for (n, e, s) : [
(false, -127, 0),
(true, -127, 0),
(false, -127, 0x399),
(true, -127, 0x23),
(false, 45, (1 << 23) | 0x23),
(true, -12, (1 << 23) | 0x3a2),
(true, -126, (1 << 23) | 0x3a1),
(false, -127, 4320708),
][:]
var m, f, t
(m, f, t) = std.flt32explode(std.flt32assem(n, e, s))
testr.check(c, n == m, "explode o assem non-identity: {} != {}", (n, e, s), (m, f, t))
testr.check(c, e == f, "explode o assem non-identity: {} != {}", (n, e, s), (m, f, t))
testr.check(c, s == t, "explode o assem non-identity: {} != {}", (n, e, s), (m, f, t))
;;
}
const exploderound64 = {c
for f : [1.0, 0.00001, 123.45, 1111111111111e+309, -1.9, -0.0001, std.flt64nan()][:]
var n, e, s
(n, e, s) = std.flt64explode(f)
var g = std.flt64assem(n, e, s)
testr.check(c, f == g, "assem o explode non-identity: {} != {}", f, g)
;;
/*
The exponents and significands need to be rather specific
in order for flt32assem to work as expected
*/
for (n, e, s) : [
(false, -1023, 0),
(true, -1023, 0),
(false, -1023, 0x399),
(true, -1023, 0x23),
(false, 45, (1 << 52) | 0xa33bc),
(true, -12, (1 << 52) | 0x3),
(true, -200, (1 << 52) | 0x11aabbcc),
(true, 543, (1 << 52) | 0x3a1),
(true, 1001, (1 << 52) | 0x99aa228),
][:]
var m, f, t
(m, f, t) = std.flt64explode(std.flt64assem(n, e, s))
testr.check(c, n == m, "explode o assem non-identity: {} != {}", (n, e, s), (m, f, t))
testr.check(c, e == f, "explode o assem non-identity: {} != {}", (n, e, s), (m, f, t))
testr.check(c, s == t, "explode o assem non-identity: {} != {}", (n, e, s), (m, f, t))
;;
}