[Mesa-dev] [PATCH] R600/SI: Use source scheduler

Michel Dänzer michel at daenzer.net
Thu Mar 7 08:05:47 PST 2013

From: Michel Dänzer <michel.daenzer at amd.com>

This is certainly not the last word on scheduling for this target, but
right now this allows a few apps to run / finish with radeonsi, most
notably UT2004 / Lightsmark. They fail to compile some shaders with the
default scheduler because it ends up trying to spill registers, which
we don't support yet (and which is probably a bad idea in general for
performance if it can be avoided).

NOTE: This is a candidate for the Mesa stable branch.

Signed-off-by: Michel Dänzer <michel.daenzer at amd.com>
 lib/Target/R600/SIISelLowering.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Target/R600/SIISelLowering.cpp b/lib/Target/R600/SIISelLowering.cpp
index cc53488..b9cc09f 100644
--- a/lib/Target/R600/SIISelLowering.cpp
+++ b/lib/Target/R600/SIISelLowering.cpp
@@ -68,6 +68,8 @@ SITargetLowering::SITargetLowering(TargetMachine &TM) :
+  setSchedulingPreference(Sched::Source);
 SDValue SITargetLowering::LowerFormalArguments(

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