On my PineView box these represent ~5% overhead on x11perf text:

Before:
16000000 trep @   0.0020 msec (495000.0/sec): Char in 80-char aa line (Charter 10)
12000000 trep @   0.0022 msec (461000.0/sec): Char in 80-char rgb line (Charter 10)

After:
16000000 trep @   0.0020 msec (511000.0/sec): Char in 80-char aa line (Charter 10)
16000000 trep @   0.0021 msec (480000.0/sec): Char in 80-char rgb line (Charter 10)

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>