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std: use simple eqlBytes for spirv

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The SPIR-V backend doesn't support the advanced
eqlBytes yet, and when it does, it likely that it
will be detrimental.
This commit is contained in:
Robin Voetter 2024-01-13 18:43:50 +01:00
parent a1b607acb5
commit 3ef5b80d2c
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1 changed files with 11 additions and 1 deletions
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12
lib/std/mem.zig
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@ -632,10 +632,16 @@ test "lessThan" {
try testing.expect(lessThan(u8, "", "a"));
}
const backend_can_use_eql_bytes = switch (builtin.zig_backend) {
// The SPIR-V backend does not support the optimized path yet.
.stage2_spirv64 => false,
else => true,
};
/// Compares two slices and returns whether they are equal.
pub fn eql(comptime T: type, a: []const T, b: []const T) bool {
if (@sizeOf(T) == 0) return true;
if (!@inComptime() and std.meta.hasUniqueRepresentation(T)) return eqlBytes(sliceAsBytes(a), sliceAsBytes(b));
if (!@inComptime() and std.meta.hasUniqueRepresentation(T) and backend_can_use_eql_bytes) return eqlBytes(sliceAsBytes(a), sliceAsBytes(b));
if (a.len != b.len) return false;
if (a.len == 0 or a.ptr == b.ptr) return true;
@ -648,6 +654,10 @@ pub fn eql(comptime T: type, a: []const T, b: []const T) bool {
/// std.mem.eql heavily optimized for slices of bytes.
fn eqlBytes(a: []const u8, b: []const u8) bool {
if (!backend_can_use_eql_bytes) {
return eql(u8, a, b);
}
if (a.len != b.len) return false;
if (a.len == 0 or a.ptr == b.ptr) return true;