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-rw-r--r--vendor/serde_json/tests/lexical/float.rs581
1 files changed, 581 insertions, 0 deletions
diff --git a/vendor/serde_json/tests/lexical/float.rs b/vendor/serde_json/tests/lexical/float.rs
new file mode 100644
index 000000000..c87e7e1ed
--- /dev/null
+++ b/vendor/serde_json/tests/lexical/float.rs
@@ -0,0 +1,581 @@
+// Adapted from https://github.com/Alexhuszagh/rust-lexical.
+
+use crate::lexical::float::ExtendedFloat;
+use crate::lexical::rounding::round_nearest_tie_even;
+use std::{f32, f64};
+
+// NORMALIZE
+
+fn check_normalize(mant: u64, exp: i32, shift: u32, r_mant: u64, r_exp: i32) {
+ let mut x = ExtendedFloat { mant, exp };
+ assert_eq!(x.normalize(), shift);
+ assert_eq!(
+ x,
+ ExtendedFloat {
+ mant: r_mant,
+ exp: r_exp
+ }
+ );
+}
+
+#[test]
+fn normalize_test() {
+ // F32
+ // 0
+ check_normalize(0, 0, 0, 0, 0);
+
+ // min value
+ check_normalize(1, -149, 63, 9223372036854775808, -212);
+
+ // 1.0e-40
+ check_normalize(71362, -149, 47, 10043308644012916736, -196);
+
+ // 1.0e-20
+ check_normalize(12379400, -90, 40, 13611294244890214400, -130);
+
+ // 1.0
+ check_normalize(8388608, -23, 40, 9223372036854775808, -63);
+
+ // 1e20
+ check_normalize(11368684, 43, 40, 12500000250510966784, 3);
+
+ // max value
+ check_normalize(16777213, 104, 40, 18446740775174668288, 64);
+
+ // F64
+
+ // min value
+ check_normalize(1, -1074, 63, 9223372036854775808, -1137);
+
+ // 1.0e-250
+ check_normalize(6448907850777164, -883, 11, 13207363278391631872, -894);
+
+ // 1.0e-150
+ check_normalize(7371020360979573, -551, 11, 15095849699286165504, -562);
+
+ // 1.0e-45
+ check_normalize(6427752177035961, -202, 11, 13164036458569648128, -213);
+
+ // 1.0e-40
+ check_normalize(4903985730770844, -185, 11, 10043362776618688512, -196);
+
+ // 1.0e-20
+ check_normalize(6646139978924579, -119, 11, 13611294676837537792, -130);
+
+ // 1.0
+ check_normalize(4503599627370496, -52, 11, 9223372036854775808, -63);
+
+ // 1e20
+ check_normalize(6103515625000000, 14, 11, 12500000000000000000, 3);
+
+ // 1e40
+ check_normalize(8271806125530277, 80, 11, 16940658945086007296, 69);
+
+ // 1e150
+ check_normalize(5503284107318959, 446, 11, 11270725851789228032, 435);
+
+ // 1e250
+ check_normalize(6290184345309700, 778, 11, 12882297539194265600, 767);
+
+ // max value
+ check_normalize(9007199254740991, 971, 11, 18446744073709549568, 960);
+}
+
+// ROUND
+
+fn check_round_to_f32(mant: u64, exp: i32, r_mant: u64, r_exp: i32) {
+ let mut x = ExtendedFloat { mant, exp };
+ x.round_to_native::<f32, _>(round_nearest_tie_even);
+ assert_eq!(
+ x,
+ ExtendedFloat {
+ mant: r_mant,
+ exp: r_exp
+ }
+ );
+}
+
+#[test]
+fn round_to_f32_test() {
+ // This is lossy, so some of these values are **slightly** rounded.
+
+ // underflow
+ check_round_to_f32(9223372036854775808, -213, 0, -149);
+
+ // min value
+ check_round_to_f32(9223372036854775808, -212, 1, -149);
+
+ // 1.0e-40
+ check_round_to_f32(10043308644012916736, -196, 71362, -149);
+
+ // 1.0e-20
+ check_round_to_f32(13611294244890214400, -130, 12379400, -90);
+
+ // 1.0
+ check_round_to_f32(9223372036854775808, -63, 8388608, -23);
+
+ // 1e20
+ check_round_to_f32(12500000250510966784, 3, 11368684, 43);
+
+ // max value
+ check_round_to_f32(18446740775174668288, 64, 16777213, 104);
+
+ // overflow
+ check_round_to_f32(18446740775174668288, 65, 16777213, 105);
+}
+
+fn check_round_to_f64(mant: u64, exp: i32, r_mant: u64, r_exp: i32) {
+ let mut x = ExtendedFloat { mant, exp };
+ x.round_to_native::<f64, _>(round_nearest_tie_even);
+ assert_eq!(
+ x,
+ ExtendedFloat {
+ mant: r_mant,
+ exp: r_exp
+ }
+ );
+}
+
+#[test]
+fn round_to_f64_test() {
+ // This is lossy, so some of these values are **slightly** rounded.
+
+ // underflow
+ check_round_to_f64(9223372036854775808, -1138, 0, -1074);
+
+ // min value
+ check_round_to_f64(9223372036854775808, -1137, 1, -1074);
+
+ // 1.0e-250
+ check_round_to_f64(15095849699286165504, -562, 7371020360979573, -551);
+
+ // 1.0e-150
+ check_round_to_f64(15095849699286165504, -562, 7371020360979573, -551);
+
+ // 1.0e-45
+ check_round_to_f64(13164036458569648128, -213, 6427752177035961, -202);
+
+ // 1.0e-40
+ check_round_to_f64(10043362776618688512, -196, 4903985730770844, -185);
+
+ // 1.0e-20
+ check_round_to_f64(13611294676837537792, -130, 6646139978924579, -119);
+
+ // 1.0
+ check_round_to_f64(9223372036854775808, -63, 4503599627370496, -52);
+
+ // 1e20
+ check_round_to_f64(12500000000000000000, 3, 6103515625000000, 14);
+
+ // 1e40
+ check_round_to_f64(16940658945086007296, 69, 8271806125530277, 80);
+
+ // 1e150
+ check_round_to_f64(11270725851789228032, 435, 5503284107318959, 446);
+
+ // 1e250
+ check_round_to_f64(12882297539194265600, 767, 6290184345309700, 778);
+
+ // max value
+ check_round_to_f64(18446744073709549568, 960, 9007199254740991, 971);
+
+ // Bug fixes
+ // 1.2345e-308
+ check_round_to_f64(10234494226754558294, -1086, 2498655817078750, -1074);
+}
+
+fn assert_normalized_eq(mut x: ExtendedFloat, mut y: ExtendedFloat) {
+ x.normalize();
+ y.normalize();
+ assert_eq!(x, y);
+}
+
+#[test]
+fn from_float() {
+ let values: [f32; 26] = [
+ 1e-40, 2e-40, 1e-35, 2e-35, 1e-30, 2e-30, 1e-25, 2e-25, 1e-20, 2e-20, 1e-15, 2e-15, 1e-10,
+ 2e-10, 1e-5, 2e-5, 1.0, 2.0, 1e5, 2e5, 1e10, 2e10, 1e15, 2e15, 1e20, 2e20,
+ ];
+ for value in &values {
+ assert_normalized_eq(
+ ExtendedFloat::from_float(*value),
+ ExtendedFloat::from_float(*value as f64),
+ );
+ }
+}
+
+// TO
+
+// Sample of interesting numbers to check during standard test builds.
+const INTEGERS: [u64; 32] = [
+ 0, // 0x0
+ 1, // 0x1
+ 7, // 0x7
+ 15, // 0xF
+ 112, // 0x70
+ 119, // 0x77
+ 127, // 0x7F
+ 240, // 0xF0
+ 247, // 0xF7
+ 255, // 0xFF
+ 2032, // 0x7F0
+ 2039, // 0x7F7
+ 2047, // 0x7FF
+ 4080, // 0xFF0
+ 4087, // 0xFF7
+ 4095, // 0xFFF
+ 65520, // 0xFFF0
+ 65527, // 0xFFF7
+ 65535, // 0xFFFF
+ 1048560, // 0xFFFF0
+ 1048567, // 0xFFFF7
+ 1048575, // 0xFFFFF
+ 16777200, // 0xFFFFF0
+ 16777207, // 0xFFFFF7
+ 16777215, // 0xFFFFFF
+ 268435440, // 0xFFFFFF0
+ 268435447, // 0xFFFFFF7
+ 268435455, // 0xFFFFFFF
+ 4294967280, // 0xFFFFFFF0
+ 4294967287, // 0xFFFFFFF7
+ 4294967295, // 0xFFFFFFFF
+ 18446744073709551615, // 0xFFFFFFFFFFFFFFFF
+];
+
+#[test]
+fn to_f32_test() {
+ // underflow
+ let x = ExtendedFloat {
+ mant: 9223372036854775808,
+ exp: -213,
+ };
+ assert_eq!(x.into_float::<f32>(), 0.0);
+
+ // min value
+ let x = ExtendedFloat {
+ mant: 9223372036854775808,
+ exp: -212,
+ };
+ assert_eq!(x.into_float::<f32>(), 1e-45);
+
+ // 1.0e-40
+ let x = ExtendedFloat {
+ mant: 10043308644012916736,
+ exp: -196,
+ };
+ assert_eq!(x.into_float::<f32>(), 1e-40);
+
+ // 1.0e-20
+ let x = ExtendedFloat {
+ mant: 13611294244890214400,
+ exp: -130,
+ };
+ assert_eq!(x.into_float::<f32>(), 1e-20);
+
+ // 1.0
+ let x = ExtendedFloat {
+ mant: 9223372036854775808,
+ exp: -63,
+ };
+ assert_eq!(x.into_float::<f32>(), 1.0);
+
+ // 1e20
+ let x = ExtendedFloat {
+ mant: 12500000250510966784,
+ exp: 3,
+ };
+ assert_eq!(x.into_float::<f32>(), 1e20);
+
+ // max value
+ let x = ExtendedFloat {
+ mant: 18446740775174668288,
+ exp: 64,
+ };
+ assert_eq!(x.into_float::<f32>(), 3.402823e38);
+
+ // almost max, high exp
+ let x = ExtendedFloat {
+ mant: 1048575,
+ exp: 108,
+ };
+ assert_eq!(x.into_float::<f32>(), 3.4028204e38);
+
+ // max value + 1
+ let x = ExtendedFloat {
+ mant: 16777216,
+ exp: 104,
+ };
+ assert_eq!(x.into_float::<f32>(), f32::INFINITY);
+
+ // max value + 1
+ let x = ExtendedFloat {
+ mant: 1048576,
+ exp: 108,
+ };
+ assert_eq!(x.into_float::<f32>(), f32::INFINITY);
+
+ // 1e40
+ let x = ExtendedFloat {
+ mant: 16940658945086007296,
+ exp: 69,
+ };
+ assert_eq!(x.into_float::<f32>(), f32::INFINITY);
+
+ // Integers.
+ for int in &INTEGERS {
+ let fp = ExtendedFloat { mant: *int, exp: 0 };
+ assert_eq!(fp.into_float::<f32>(), *int as f32, "{:?} as f32", *int);
+ }
+}
+
+#[test]
+fn to_f64_test() {
+ // underflow
+ let x = ExtendedFloat {
+ mant: 9223372036854775808,
+ exp: -1138,
+ };
+ assert_eq!(x.into_float::<f64>(), 0.0);
+
+ // min value
+ let x = ExtendedFloat {
+ mant: 9223372036854775808,
+ exp: -1137,
+ };
+ assert_eq!(x.into_float::<f64>(), 5e-324);
+
+ // 1.0e-250
+ let x = ExtendedFloat {
+ mant: 13207363278391631872,
+ exp: -894,
+ };
+ assert_eq!(x.into_float::<f64>(), 1e-250);
+
+ // 1.0e-150
+ let x = ExtendedFloat {
+ mant: 15095849699286165504,
+ exp: -562,
+ };
+ assert_eq!(x.into_float::<f64>(), 1e-150);
+
+ // 1.0e-45
+ let x = ExtendedFloat {
+ mant: 13164036458569648128,
+ exp: -213,
+ };
+ assert_eq!(x.into_float::<f64>(), 1e-45);
+
+ // 1.0e-40
+ let x = ExtendedFloat {
+ mant: 10043362776618688512,
+ exp: -196,
+ };
+ assert_eq!(x.into_float::<f64>(), 1e-40);
+
+ // 1.0e-20
+ let x = ExtendedFloat {
+ mant: 13611294676837537792,
+ exp: -130,
+ };
+ assert_eq!(x.into_float::<f64>(), 1e-20);
+
+ // 1.0
+ let x = ExtendedFloat {
+ mant: 9223372036854775808,
+ exp: -63,
+ };
+ assert_eq!(x.into_float::<f64>(), 1.0);
+
+ // 1e20
+ let x = ExtendedFloat {
+ mant: 12500000000000000000,
+ exp: 3,
+ };
+ assert_eq!(x.into_float::<f64>(), 1e20);
+
+ // 1e40
+ let x = ExtendedFloat {
+ mant: 16940658945086007296,
+ exp: 69,
+ };
+ assert_eq!(x.into_float::<f64>(), 1e40);
+
+ // 1e150
+ let x = ExtendedFloat {
+ mant: 11270725851789228032,
+ exp: 435,
+ };
+ assert_eq!(x.into_float::<f64>(), 1e150);
+
+ // 1e250
+ let x = ExtendedFloat {
+ mant: 12882297539194265600,
+ exp: 767,
+ };
+ assert_eq!(x.into_float::<f64>(), 1e250);
+
+ // max value
+ let x = ExtendedFloat {
+ mant: 9007199254740991,
+ exp: 971,
+ };
+ assert_eq!(x.into_float::<f64>(), 1.7976931348623157e308);
+
+ // max value
+ let x = ExtendedFloat {
+ mant: 18446744073709549568,
+ exp: 960,
+ };
+ assert_eq!(x.into_float::<f64>(), 1.7976931348623157e308);
+
+ // overflow
+ let x = ExtendedFloat {
+ mant: 9007199254740992,
+ exp: 971,
+ };
+ assert_eq!(x.into_float::<f64>(), f64::INFINITY);
+
+ // overflow
+ let x = ExtendedFloat {
+ mant: 18446744073709549568,
+ exp: 961,
+ };
+ assert_eq!(x.into_float::<f64>(), f64::INFINITY);
+
+ // Underflow
+ // Adapted from failures in strtod.
+ let x = ExtendedFloat {
+ exp: -1139,
+ mant: 18446744073709550712,
+ };
+ assert_eq!(x.into_float::<f64>(), 0.0);
+
+ let x = ExtendedFloat {
+ exp: -1139,
+ mant: 18446744073709551460,
+ };
+ assert_eq!(x.into_float::<f64>(), 0.0);
+
+ let x = ExtendedFloat {
+ exp: -1138,
+ mant: 9223372036854776103,
+ };
+ assert_eq!(x.into_float::<f64>(), 5e-324);
+
+ // Integers.
+ for int in &INTEGERS {
+ let fp = ExtendedFloat { mant: *int, exp: 0 };
+ assert_eq!(fp.into_float::<f64>(), *int as f64, "{:?} as f64", *int);
+ }
+}
+
+// OPERATIONS
+
+fn check_mul(a: ExtendedFloat, b: ExtendedFloat, c: ExtendedFloat) {
+ let r = a.mul(&b);
+ assert_eq!(r, c);
+}
+
+#[test]
+fn mul_test() {
+ // Normalized (64-bit mantissa)
+ let a = ExtendedFloat {
+ mant: 13164036458569648128,
+ exp: -213,
+ };
+ let b = ExtendedFloat {
+ mant: 9223372036854775808,
+ exp: -62,
+ };
+ let c = ExtendedFloat {
+ mant: 6582018229284824064,
+ exp: -211,
+ };
+ check_mul(a, b, c);
+
+ // Check with integers
+ // 64-bit mantissa
+ let mut a = ExtendedFloat { mant: 10, exp: 0 };
+ let mut b = ExtendedFloat { mant: 10, exp: 0 };
+ a.normalize();
+ b.normalize();
+ assert_eq!(a.mul(&b).into_float::<f64>(), 100.0);
+
+ // Check both values need high bits set.
+ let a = ExtendedFloat {
+ mant: 1 << 32,
+ exp: -31,
+ };
+ let b = ExtendedFloat {
+ mant: 1 << 32,
+ exp: -31,
+ };
+ assert_eq!(a.mul(&b).into_float::<f64>(), 4.0);
+
+ // Check both values need high bits set.
+ let a = ExtendedFloat {
+ mant: 10 << 31,
+ exp: -31,
+ };
+ let b = ExtendedFloat {
+ mant: 10 << 31,
+ exp: -31,
+ };
+ assert_eq!(a.mul(&b).into_float::<f64>(), 100.0);
+}
+
+fn check_imul(mut a: ExtendedFloat, b: ExtendedFloat, c: ExtendedFloat) {
+ a.imul(&b);
+ assert_eq!(a, c);
+}
+
+#[test]
+fn imul_test() {
+ // Normalized (64-bit mantissa)
+ let a = ExtendedFloat {
+ mant: 13164036458569648128,
+ exp: -213,
+ };
+ let b = ExtendedFloat {
+ mant: 9223372036854775808,
+ exp: -62,
+ };
+ let c = ExtendedFloat {
+ mant: 6582018229284824064,
+ exp: -211,
+ };
+ check_imul(a, b, c);
+
+ // Check with integers
+ // 64-bit mantissa
+ let mut a = ExtendedFloat { mant: 10, exp: 0 };
+ let mut b = ExtendedFloat { mant: 10, exp: 0 };
+ a.normalize();
+ b.normalize();
+ a.imul(&b);
+ assert_eq!(a.into_float::<f64>(), 100.0);
+
+ // Check both values need high bits set.
+ let mut a = ExtendedFloat {
+ mant: 1 << 32,
+ exp: -31,
+ };
+ let b = ExtendedFloat {
+ mant: 1 << 32,
+ exp: -31,
+ };
+ a.imul(&b);
+ assert_eq!(a.into_float::<f64>(), 4.0);
+
+ // Check both values need high bits set.
+ let mut a = ExtendedFloat {
+ mant: 10 << 31,
+ exp: -31,
+ };
+ let b = ExtendedFloat {
+ mant: 10 << 31,
+ exp: -31,
+ };
+ a.imul(&b);
+ assert_eq!(a.into_float::<f64>(), 100.0);
+}
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