cmpxf2.zig

File

Code

///! The quoted behavior definitions are from
///! https://gcc.gnu.org/onlinedocs/gcc-12.1.0/gccint/Soft-float-library-routines.html#Soft-float-library-routines
const compiler_rt = @import("../compiler_rt.zig");
const symbol = compiler_rt.symbol;
const comparef = @import("./comparef.zig");

comptime {
    symbol(&__eqxf2, "__eqxf2");
    symbol(&__nexf2, "__nexf2");
    symbol(&__lexf2, "__lexf2");
    symbol(&__cmpxf2, "__cmpxf2");
    symbol(&__ltxf2, "__ltxf2");
}

/// "These functions calculate a <=> b. That is, if a is less than b, they return -1;
/// if a is greater than b, they return 1; and if a and b are equal they return 0.
/// If either argument is NaN they return 1..."
///
/// Note that this matches the definition of `__lexf2`, `__eqxf2`, `__nexf2`, `__cmpxf2`,
/// and `__ltxf2`.
fn __cmpxf2(a: f80, b: f80) callconv(.c) i32 {
    return @backingInt(comparef.cmp_f80(comparef.LE, a, b));
}

/// "These functions return a value less than or equal to zero if neither argument is NaN,
/// and a is less than or equal to b."
fn __lexf2(a: f80, b: f80) callconv(.c) i32 {
    return __cmpxf2(a, b);
}

/// "These functions return zero if neither argument is NaN, and a and b are equal."
/// Note that due to some kind of historical accident, __eqxf2 and __nexf2 are defined
/// to have the same return value.
fn __eqxf2(a: f80, b: f80) callconv(.c) i32 {
    return __cmpxf2(a, b);
}

/// "These functions return a nonzero value if either argument is NaN, or if a and b are unequal."
/// Note that due to some kind of historical accident, __eqxf2 and __nexf2 are defined
/// to have the same return value.
fn __nexf2(a: f80, b: f80) callconv(.c) i32 {
    return __cmpxf2(a, b);
}

/// "These functions return a value less than zero if neither argument is NaN, and a
/// is strictly less than b."
fn __ltxf2(a: f80, b: f80) callconv(.c) i32 {
    return __cmpxf2(a, b);
}