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micro-optimize String.eql(String)

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This commit is contained in:
Karl Seguin
2026-01-24 15:56:15 +08:00
parent a3d2dd8366
commit 862520e4b1
1 changed files with 10 additions and 8 deletions
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18
src/string.zig
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@@ -137,20 +137,22 @@ pub const String = packed struct {
}
pub fn eql(a: String, b: String) bool {
if (a.len != b.len or a.len < 0 or b.len < 0) {
if (@as(*const u64, @ptrCast(&a)).* != @as(*const u64, @ptrCast(&b)).*) {
return false;
}
if (a.len <= 12) {
const len = a.len;
if (len < 0 or b.len < 0) {
return false;
}
if (len <= 12) {
return @reduce(.And, a.payload.content == b.payload.content);
}
if (@reduce(.And, a.payload.heap.prefix == b.payload.heap.prefix) == false) {
return false;
}
const al: usize = @intCast(a.len);
const bl: usize = @intCast(a.len);
// a.len == b.len at this point
const al: usize = @intCast(len);
const bl: usize = @intCast(len);
return std.mem.eql(u8, a.payload.heap.ptr[0..al], b.payload.heap.ptr[0..bl]);
}