28 lines
666 B
Zig
28 lines
666 B
Zig
const builtin = @import("builtin");
|
|
const std = @import("std");
|
|
|
|
const twop52: f64 = 0x1.0p52;
|
|
const twop32: f64 = 0x1.0p32;
|
|
|
|
pub fn __floatdidf(a: i64) callconv(.C) f64 {
|
|
@setRuntimeSafety(builtin.is_test);
|
|
|
|
if (a == 0) return 0;
|
|
|
|
var low = @bitCast(i64, twop52);
|
|
const high = @intToFloat(f64, @truncate(i32, a >> 32)) * twop32;
|
|
|
|
low |= @bitCast(i64, a & 0xFFFFFFFF);
|
|
|
|
return (high - twop52) + @bitCast(f64, low);
|
|
}
|
|
|
|
pub fn __aeabi_l2d(arg: i64) callconv(.AAPCS) f64 {
|
|
@setRuntimeSafety(false);
|
|
return @call(.{ .modifier = .always_inline }, __floatdidf, .{arg});
|
|
}
|
|
|
|
test "import floatdidf" {
|
|
_ = @import("floatdidf_test.zig");
|
|
}
|