On Fri, Feb 23, 2024 at 11:05:29AM +0000, David Laight wrote:

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+		if ((_count % 8) >= 4) {

If (_count & 4) {

That would be obfuscating, IMHO. The compiler doesn't need such things
to generate optimal code.

Try it: https://godbolt.org/z/EvvGrTxv3
And it isn't that obfuscated - no more so than your version.

The godbolt link does "n % 8 > 4" instead of "... >= 4" as in Jason's
original code. With ">=" the compiled code matches that for "n & 4".

Bugger :-)

Yes, I already fine tuned things to get good codegen.

Jason