mirror of
https://codeberg.org/ziglang/zig.git
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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
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//! * @panic, if result can not be represented
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//! - negvXi4_generic for unoptimized version
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const std = @import("std");
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const builtin = @import("builtin");
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const compiler_rt = @import("../compiler_rt.zig");
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const symbol = compiler_rt.symbol;
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comptime {
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symbol(&__negvsi2, "__negvsi2");
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symbol(&__negvdi2, "__negvdi2");
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symbol(&__negvti2, "__negvti2");
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}
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pub fn __negvsi2(a: i32) callconv(.c) i32 {
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return negvXi(i32, a);
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}
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pub fn __negvdi2(a: i64) callconv(.c) i64 {
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return negvXi(i64, a);
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}
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pub fn __negvti2(a: i128) callconv(.c) i128 {
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return negvXi(i128, a);
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}
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inline fn negvXi(comptime ST: type, a: ST) ST {
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const UT = switch (ST) {
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i32 => u32,
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i64 => u64,
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i128 => u128,
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else => unreachable,
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};
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const N: UT = @bitSizeOf(ST);
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const min: ST = @as(ST, @bitCast((@as(UT, 1) << (N - 1))));
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if (a == min)
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@panic("compiler_rt negv: overflow");
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return -a;
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}
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test {
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_ = @import("negvsi2_test.zig");
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_ = @import("negvdi2_test.zig");
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_ = @import("negvti2_test.zig");
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}
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