mirror of
https://codeberg.org/ziglang/zig.git
synced 2026-03-08 01:04:43 +01:00
74608293af
use the "symbol" helper function in all exports move all declarations from common.zig to compiler_rt.zig flatten the tree structure somewhat (move contents of tiny files into parent files) No functional changes.
45 lines
1.1 KiB
Zig
45 lines
1.1 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 compiler_rt = @import("../compiler_rt.zig");
|
|
const symbol = compiler_rt.symbol;
|
|
|
|
comptime {
|
|
symbol(&__negvsi2, "__negvsi2");
|
|
symbol(&__negvdi2, "__negvdi2");
|
|
symbol(&__negvti2, "__negvti2");
|
|
}
|
|
|
|
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 = @as(ST, @bitCast((@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");
|
|
}
|