Commit e81bf1c38c9330d6f68584627992d3ab820ed50f | zig

This is more in line what usual C implementations do.

1 files changed, 19 insertions(+), 6 deletions(-)

std/math/frexp.zig+19-6

...	...	@@ -2,7 +2,7 @@
2	2	//
3	3	// - frexp(+-0) = +-0, 0
4	4	// - frexp(+-inf) = +-inf, 0
5		// - frexp(nan) = nan, 0
	5	// - frexp(nan) = nan, undefined
6	6
7	7	const math = @import("index.zig");
8	8	const assert = @import("../debug.zig").assert;
...	...	@@ -46,9 +46,15 @@ fn frexp32(x: f32) -> frexp32_result {
46	46	}
47	47	return result;
48	48	} else if (e == 0xFF) {
49		// frexp(nan) = (nan, 0)
	49	// frexp(nan) = (nan, undefined)
50	50	result.significand = x;
51		result.exponent = 0;
	51	result.exponent = undefined;
	52
	53	// frexp(+-inf) = (+-inf, 0)
	54	if (math.isInf(x)) {
	55	result.exponent = 0;
	56	}
	57
52	58	return result;
53	59	}
54	60
...	...	@@ -77,8 +83,15 @@ fn frexp64(x: f64) -> frexp64_result {
77	83	}
78	84	return result;
79	85	} else if (e == 0x7FF) {
	86	// frexp(nan) = (nan, undefined)
80	87	result.significand = x;
81		result.exponent = 0;
	88	result.exponent = undefined;
	89
	90	// frexp(+-inf) = (+-inf, 0)
	91	if (math.isInf(x)) {
	92	result.exponent = 0;
	93	}
	94
82	95	return result;
83	96	}
84	97
...	...	@@ -137,7 +150,7 @@ test "math.frexp32.special" {
137	150	assert(math.isNegativeInf(r.significand) and r.exponent == 0);
138	151
139	152	r = frexp32(math.nan(f32));
140		assert(math.isNan(r.significand) and r.exponent == 0);
	153	assert(math.isNan(r.significand));
141	154	}
142	155
143	156	test "math.frexp64.special" {
...	...	@@ -156,5 +169,5 @@ test "math.frexp64.special" {
156	169	assert(math.isNegativeInf(r.significand) and r.exponent == 0);
157	170
158	171	r = frexp64(math.nan(f64));
159		assert(math.isNan(r.significand) and r.exponent == 0);
	172	assert(math.isNan(r.significand));
160	173	}