mirror of
https://github.com/ziglang/zig.git
synced 2024-11-26 23:22:44 +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`.
58 lines
1.9 KiB
Zig
58 lines
1.9 KiB
Zig
const std = @import("std");
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const builtin = @import("builtin");
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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(__fabsh, .{ .name = "__fabsh", .linkage = common.linkage, .visibility = common.visibility });
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@export(fabsf, .{ .name = "fabsf", .linkage = common.linkage, .visibility = common.visibility });
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@export(fabs, .{ .name = "fabs", .linkage = common.linkage, .visibility = common.visibility });
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@export(__fabsx, .{ .name = "__fabsx", .linkage = common.linkage, .visibility = common.visibility });
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if (common.want_ppc_abi) {
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@export(fabsq, .{ .name = "fabsf128", .linkage = common.linkage, .visibility = common.visibility });
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}
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@export(fabsq, .{ .name = "fabsq", .linkage = common.linkage, .visibility = common.visibility });
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@export(fabsl, .{ .name = "fabsl", .linkage = common.linkage, .visibility = common.visibility });
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}
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pub fn __fabsh(a: f16) callconv(.C) f16 {
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return generic_fabs(a);
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}
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pub fn fabsf(a: f32) callconv(.C) f32 {
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return generic_fabs(a);
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}
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pub fn fabs(a: f64) callconv(.C) f64 {
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return generic_fabs(a);
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}
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pub fn __fabsx(a: f80) callconv(.C) f80 {
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return generic_fabs(a);
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}
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pub fn fabsq(a: f128) callconv(.C) f128 {
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return generic_fabs(a);
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}
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pub fn fabsl(x: c_longdouble) callconv(.C) c_longdouble {
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switch (@typeInfo(c_longdouble).Float.bits) {
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16 => return __fabsh(x),
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32 => return fabsf(x),
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64 => return fabs(x),
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80 => return __fabsx(x),
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128 => return fabsq(x),
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else => @compileError("unreachable"),
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}
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}
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inline fn generic_fabs(x: anytype) @TypeOf(x) {
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const T = @TypeOf(x);
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const TBits = std.meta.Int(.unsigned, @typeInfo(T).Float.bits);
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const float_bits = @bitCast(TBits, x);
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const remove_sign = ~@as(TBits, 0) >> 1;
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return @bitCast(T, float_bits & remove_sign);
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}
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