mirror of
https://codeberg.org/ziglang/zig.git
synced 2025-12-06 13:54:21 +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`.
46 lines
1.3 KiB
Zig
46 lines
1.3 KiB
Zig
//! negv - negate oVerflow
|
|
//! * @panic, if result can not be represented
|
|
//! - negvXi4_generic for unoptimized version
|
|
const std = @import("std");
|
|
const builtin = @import("builtin");
|
|
const common = @import("common.zig");
|
|
|
|
pub const panic = common.panic;
|
|
|
|
comptime {
|
|
@export(__negvsi2, .{ .name = "__negvsi2", .linkage = common.linkage, .visibility = common.visibility });
|
|
@export(__negvdi2, .{ .name = "__negvdi2", .linkage = common.linkage, .visibility = common.visibility });
|
|
@export(__negvti2, .{ .name = "__negvti2", .linkage = common.linkage, .visibility = common.visibility });
|
|
}
|
|
|
|
pub fn __negvsi2(a: i32) callconv(.C) i32 {
|
|
return negvXi(i32, a);
|
|
}
|
|
|
|
pub fn __negvdi2(a: i64) callconv(.C) i64 {
|
|
return negvXi(i64, a);
|
|
}
|
|
|
|
pub fn __negvti2(a: i128) callconv(.C) i128 {
|
|
return negvXi(i128, a);
|
|
}
|
|
|
|
inline fn negvXi(comptime ST: type, a: ST) ST {
|
|
const UT = switch (ST) {
|
|
i32 => u32,
|
|
i64 => u64,
|
|
i128 => u128,
|
|
else => unreachable,
|
|
};
|
|
const N: UT = @bitSizeOf(ST);
|
|
const min: ST = @bitCast(ST, (@as(UT, 1) << (N - 1)));
|
|
if (a == min)
|
|
@panic("compiler_rt negv: overflow");
|
|
return -a;
|
|
}
|
|
|
|
test {
|
|
_ = @import("negvsi2_test.zig");
|
|
_ = @import("negvdi2_test.zig");
|
|
_ = @import("negvti2_test.zig");
|
|
}
|