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https://github.com/ziglang/zig.git
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0556a2ba53
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.
70 lines
2.2 KiB
Zig
70 lines
2.2 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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const math = std.math;
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const arch = builtin.cpu.arch;
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const common = @import("common.zig");
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pub const panic = common.panic;
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comptime {
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@export(__fminh, .{ .name = "__fminh", .linkage = common.linkage });
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@export(fminf, .{ .name = "fminf", .linkage = common.linkage });
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@export(fmin, .{ .name = "fmin", .linkage = common.linkage });
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@export(__fminx, .{ .name = "__fminx", .linkage = common.linkage });
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const fminq_sym_name = if (common.want_ppc_abi) "fminf128" else "fminq";
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@export(fminq, .{ .name = fminq_sym_name, .linkage = common.linkage });
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@export(fminl, .{ .name = "fminl", .linkage = common.linkage });
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}
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pub fn __fminh(x: f16, y: f16) callconv(.C) f16 {
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return generic_fmin(f16, x, y);
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}
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pub fn fminf(x: f32, y: f32) callconv(.C) f32 {
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return generic_fmin(f32, x, y);
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}
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pub fn fmin(x: f64, y: f64) callconv(.C) f64 {
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return generic_fmin(f64, x, y);
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}
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pub fn __fminx(x: f80, y: f80) callconv(.C) f80 {
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return generic_fmin(f80, x, y);
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}
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pub fn fminq(x: f128, y: f128) callconv(.C) f128 {
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return generic_fmin(f128, x, y);
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}
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pub fn fminl(x: c_longdouble, y: c_longdouble) callconv(.C) c_longdouble {
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switch (@typeInfo(c_longdouble).Float.bits) {
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16 => return __fminh(x, y),
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32 => return fminf(x, y),
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64 => return fmin(x, y),
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80 => return __fminx(x, y),
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128 => return fminq(x, y),
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else => @compileError("unreachable"),
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}
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}
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inline fn generic_fmin(comptime T: type, x: T, y: T) T {
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if (math.isNan(x))
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return y;
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if (math.isNan(y))
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return x;
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return if (x < y) x else y;
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}
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test "generic_fmin" {
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inline for ([_]type{ f32, f64, c_longdouble, f80, f128 }) |T| {
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const nan_val = math.nan(T);
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try std.testing.expect(math.isNan(generic_fmin(T, nan_val, nan_val)));
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try std.testing.expectEqual(@as(T, 1.0), generic_fmin(T, nan_val, 1.0));
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try std.testing.expectEqual(@as(T, 1.0), generic_fmin(T, 1.0, nan_val));
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try std.testing.expectEqual(@as(T, 1.0), generic_fmin(T, 1.0, 10.0));
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try std.testing.expectEqual(@as(T, -1.0), generic_fmin(T, 1.0, -1.0));
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}
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}
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