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i965: Avoid dependency hints on math opcodes

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Putting NoDDClr and NoDDChk dependency control on instruction
sequences that include math opcodes can cause corruption of channels.
Treat math opcodes like send opcodes and suppress dependency hinting.

Signed-off-by: Mike Stroyan <mike@LunarG.com>
Tested-by: Tony Bertapelli <anthony.p.bertapelli@intel.com>
Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Matt Turner <mattst88@gmail.com>
(cherry picked from commit 602510395a)
This commit is contained in:
Mike Stroyan 2014-02-12 17:24:55 -07:00 • committed by Carl Worth
parent 9abd686e3f
commit a616fbd7aa
1 changed files with 8 additions and 0 deletions
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8
src/mesa/drivers/dri/i965/brw_vec4.cpp
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@ -717,6 +717,14 @@ vec4_visitor::opt_set_dependency_control()
continue;
}
/* Dependency control does not work well over math instructions.
*/
if (inst->is_math()) {
memset(last_grf_write, 0, sizeof(last_grf_write));
memset(last_mrf_write, 0, sizeof(last_mrf_write));
continue;
}
/* Now, see if we can do dependency control for this instruction
* against a previous one writing to its destination.
*/