23 lines
503 B
Zig
23 lines
503 B
Zig
const builtin = @import("builtin");
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const std = @import("std");
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const twop52: f64 = 0x1.0p52;
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const twop32: f64 = 0x1.0p32;
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pub extern fn __floatdidf(a: i64) f64 {
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@setRuntimeSafety(builtin.is_test);
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if (a == 0) return 0;
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var low = @bitCast(i64, twop52);
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const high = @intToFloat(f64, @truncate(i32, a >> 32)) * twop32;
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low |= @bitCast(i64, a & 0xFFFFFFFF);
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return (high - twop52) + @bitCast(f64, low);
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}
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test "import floatdidf" {
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_ = @import("floatdidf_test.zig");
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}
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