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fix:use builtin memmove (#9033)

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This commit is contained in:
Mitchell Hashimoto
2025-10-05 08:18:08 -07:00
committed by GitHub
parent 31ba6534cf ff3a6d0650
commit fa3bc416ab
1 changed files with 3 additions and 10 deletions
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13
src/fastmem.zig
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@@ -2,20 +2,13 @@ const std = @import("std");
const builtin = @import("builtin"); const builtin = @import("builtin");
const assert = std.debug.assert; const assert = std.debug.assert;
/// Same as std.mem.copyForwards/Backwards but prefers libc memmove if it is /// Same as @memmove but prefers libc memmove if it is
/// available because it is generally much faster. /// available because it is generally much faster?.
pub inline fn move(comptime T: type, dest: []T, source: []const T) void { pub inline fn move(comptime T: type, dest: []T, source: []const T) void {
if (builtin.link_libc) { if (builtin.link_libc) {
_ = memmove(dest.ptr, source.ptr, source.len * @sizeOf(T)); _ = memmove(dest.ptr, source.ptr, source.len * @sizeOf(T));
} else { } else {
// Depending on the ordering of the copy, we need to use the @memmove(dest, source);
// proper call here. Unfortunately this function call is
// too generic to know this at comptime.
if (@intFromPtr(dest.ptr) <= @intFromPtr(source.ptr)) {
std.mem.copyForwards(T, dest, source);
} else {
std.mem.copyBackwards(T, dest, source);
}
} }
} }