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8f1e417757
We assume we are compiled on a base-2 radix floating point system. This is a reasonable assumption. musl libc as an example also assumes this. We implement scalbn as an alias for ldexp, since ldexp is defined as 2 regardless of the float radix. This is opposite to musl which defines scalbn in terms of ldexp. Closes #9799.
15 lines
512 B
Zig
15 lines
512 B
Zig
const std = @import("std");
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const expect = std.testing.expect;
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/// Returns a * FLT_RADIX ^ exp.
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///
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/// Zig only supports binary radix IEEE-754 floats. Hence FLT_RADIX=2, and this is an alias for ldexp.
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pub const scalbn = @import("ldexp.zig").ldexp;
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test "math.scalbn" {
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// Verify we are using radix 2.
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try expect(scalbn(@as(f16, 1.5), 4) == 24.0);
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try expect(scalbn(@as(f32, 1.5), 4) == 24.0);
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try expect(scalbn(@as(f64, 1.5), 4) == 24.0);
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try expect(scalbn(@as(f128, 1.5), 4) == 24.0);
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}
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