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@lists.freedesktop.org Reporter: siro@das-labor.org QA Contact: dri-devel@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.
https://bugs.freedesktop.org/show_bug.cgi?id=94459
--- Comment #1 from Patrick Rudolph siro@das-labor.org --- Created attachment 122172 --> https://bugs.freedesktop.org/attachment.cgi?id=122172&action=edit patch r600_shader.c to insert a ALU_OP1_RNDNE instruction on pre r8xx cards for TGSI_OPCODE_ARR
https://bugs.freedesktop.org/show_bug.cgi?id=94459
--- Comment #2 from Roland Scheidegger sroland@vmware.com --- The code in question isn't used by anything non-r600/r700, thus a switch isn't warranted. (I think it would look nicer if the arl/arr cases were merged and use a conditional to select the rounding instruction too.)
https://bugs.freedesktop.org/show_bug.cgi?id=94459
GitLab Migration User gitlab-migration@fdo.invalid changed:
What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |MOVED
--- Comment #3 from GitLab Migration User gitlab-migration@fdo.invalid --- -- GitLab Migration Automatic Message --
This bug has been migrated to freedesktop.org's GitLab instance and has been closed from further activity.
You can subscribe and participate further through the new bug through this link to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/579.
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