zig/lib/compiler_rt/fmin.zig
Andrew Kelley 0556a2ba53 compiler-rt: finish cleanups
Finishes cleanups that I started in other commits in this branch.

 * Use common.linkage for all exports instead of redoing the logic in
   each file.
 * Remove pointless `@setRuntimeSafety` calls.
 * Avoid redundantly exporting multiple versions of functions. For
   example, if PPC wants `ceilf128` then don't also export `ceilq`;
   similarly if ARM wants `__aeabi_ddiv` then don't also export
   `__divdf3`.
 * Use `inline` for helper functions instead of making inline calls at
   callsites.
2022-06-17 18:10:00 -07:00

70 lines
2.2 KiB
Zig

const std = @import("std");
const builtin = @import("builtin");
const math = std.math;
const arch = builtin.cpu.arch;
const common = @import("common.zig");
pub const panic = common.panic;
comptime {
@export(__fminh, .{ .name = "__fminh", .linkage = common.linkage });
@export(fminf, .{ .name = "fminf", .linkage = common.linkage });
@export(fmin, .{ .name = "fmin", .linkage = common.linkage });
@export(__fminx, .{ .name = "__fminx", .linkage = common.linkage });
const fminq_sym_name = if (common.want_ppc_abi) "fminf128" else "fminq";
@export(fminq, .{ .name = fminq_sym_name, .linkage = common.linkage });
@export(fminl, .{ .name = "fminl", .linkage = common.linkage });
}
pub fn __fminh(x: f16, y: f16) callconv(.C) f16 {
return generic_fmin(f16, x, y);
}
pub fn fminf(x: f32, y: f32) callconv(.C) f32 {
return generic_fmin(f32, x, y);
}
pub fn fmin(x: f64, y: f64) callconv(.C) f64 {
return generic_fmin(f64, x, y);
}
pub fn __fminx(x: f80, y: f80) callconv(.C) f80 {
return generic_fmin(f80, x, y);
}
pub fn fminq(x: f128, y: f128) callconv(.C) f128 {
return generic_fmin(f128, x, y);
}
pub fn fminl(x: c_longdouble, y: c_longdouble) callconv(.C) c_longdouble {
switch (@typeInfo(c_longdouble).Float.bits) {
16 => return __fminh(x, y),
32 => return fminf(x, y),
64 => return fmin(x, y),
80 => return __fminx(x, y),
128 => return fminq(x, y),
else => @compileError("unreachable"),
}
}
inline fn generic_fmin(comptime T: type, x: T, y: T) T {
if (math.isNan(x))
return y;
if (math.isNan(y))
return x;
return if (x < y) x else y;
}
test "generic_fmin" {
inline for ([_]type{ f32, f64, c_longdouble, f80, f128 }) |T| {
const nan_val = math.nan(T);
try std.testing.expect(math.isNan(generic_fmin(T, nan_val, nan_val)));
try std.testing.expectEqual(@as(T, 1.0), generic_fmin(T, nan_val, 1.0));
try std.testing.expectEqual(@as(T, 1.0), generic_fmin(T, 1.0, nan_val));
try std.testing.expectEqual(@as(T, 1.0), generic_fmin(T, 1.0, 10.0));
try std.testing.expectEqual(@as(T, -1.0), generic_fmin(T, 1.0, -1.0));
}
}