Running WINE tests with Gallium Nine enabled I found the following test to fail
on pre R800 cards.
The failing test is from wine d3d9/tests/visual.c test_mova().
It can be found here: https://source.winehq.org/ident?_i=test_mova&_remember=1

To issue doesn't exists on radeonsi, softpipe and R800+.

The problem seems to be TGSI_OPCODE_ARR that should round on FLT_TO_INT, but
pre R800 cards truncate instead.
This might result in wrong addressing, as TGSI_OPCODE_ARR is expected to round.
If the card doesn't support rounding on FLT_TO_INT, r600 driver should insert a
rounding instruction.

Tested with latest mesa git on RV770.