mirror of
https://github.com/ziglang/zig.git
synced 2025-02-08 21:50:33 +00:00
30f2bb8464
When we're compiling compiler_rt for any WebAssembly target, we do not want to expose all the compiler-rt functions to the host runtime. By setting the visibility of all exports to `hidden`, we allow the linker to resolve the symbols during linktime, while not expose the functions to the host runtime. This also means the linker can properly garbage collect any compiler-rt function that does not get resolved. The symbol visibility for all target remains the same as before: `default`.
72 lines
2.4 KiB
Zig
72 lines
2.4 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(__fmaxh, .{ .name = "__fmaxh", .linkage = common.linkage, .visibility = common.visibility });
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@export(fmaxf, .{ .name = "fmaxf", .linkage = common.linkage, .visibility = common.visibility });
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@export(fmax, .{ .name = "fmax", .linkage = common.linkage, .visibility = common.visibility });
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@export(__fmaxx, .{ .name = "__fmaxx", .linkage = common.linkage, .visibility = common.visibility });
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if (common.want_ppc_abi) {
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@export(fmaxq, .{ .name = "fmaxf128", .linkage = common.linkage, .visibility = common.visibility });
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}
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@export(fmaxq, .{ .name = "fmaxq", .linkage = common.linkage, .visibility = common.visibility });
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@export(fmaxl, .{ .name = "fmaxl", .linkage = common.linkage, .visibility = common.visibility });
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}
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pub fn __fmaxh(x: f16, y: f16) callconv(.C) f16 {
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return generic_fmax(f16, x, y);
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}
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pub fn fmaxf(x: f32, y: f32) callconv(.C) f32 {
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return generic_fmax(f32, x, y);
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}
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pub fn fmax(x: f64, y: f64) callconv(.C) f64 {
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return generic_fmax(f64, x, y);
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}
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pub fn __fmaxx(x: f80, y: f80) callconv(.C) f80 {
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return generic_fmax(f80, x, y);
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}
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pub fn fmaxq(x: f128, y: f128) callconv(.C) f128 {
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return generic_fmax(f128, x, y);
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}
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pub fn fmaxl(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 __fmaxh(x, y),
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32 => return fmaxf(x, y),
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64 => return fmax(x, y),
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80 => return __fmaxx(x, y),
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128 => return fmaxq(x, y),
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else => @compileError("unreachable"),
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}
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}
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inline fn generic_fmax(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) y else x;
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}
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test "generic_fmax" {
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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_fmax(T, nan_val, nan_val)));
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try std.testing.expectEqual(@as(T, 1.0), generic_fmax(T, nan_val, 1.0));
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try std.testing.expectEqual(@as(T, 1.0), generic_fmax(T, 1.0, nan_val));
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try std.testing.expectEqual(@as(T, 10.0), generic_fmax(T, 1.0, 10.0));
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try std.testing.expectEqual(@as(T, 1.0), generic_fmax(T, 1.0, -1.0));
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}
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}
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