[Bug 94459] FLT_TO_INT rounding issues on pre R800 cards

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94459

            Bug ID: 94459
           Summary: FLT_TO_INT rounding issues on pre R800 cards
           Product: Mesa
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: medium
         Component: Drivers/Gallium/r600
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: siro at das-labor.org
        QA Contact: dri-devel at lists.freedesktop.org

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.

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