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Author SHA1 Message Date
Matthias Braun 97d0ffbe06 ScheduleDAGInstrs: Rework schedule graph builder. 
Re-comitting with a change that avoids undefined uses getting put into
the VRegUses list.

The new algorithm remembers the uses encountered while walking backwards
until a matching def is found. Contrary to the previous version this:
- Works without LiveIntervals being available
- Allows to increase the precision to subregisters/lanemasks
  (not used for now)

The changes in the AMDGPU tests are necessary because the R600 scheduler
is not stable with respect to the order of nodes in the ready queues.

Differential Revision: http://reviews.llvm.org/D9068

llvm-svn: 254683
 2015-12-04 01:51:19 +00:00
Matthias Braun 2fd672a221 Revert "ScheduleDAGInstrs: Rework schedule graph builder." 
This works mostly fine but breaks some stage 1 builders when compiling
compiler-rt on i386. Revert for further investigation as I can't see an
obvious cause/fix.

This reverts commit r254577.

llvm-svn: 254586
 2015-12-03 03:01:10 +00:00
Matthias Braun d35fe3d984 ScheduleDAGInstrs: Rework schedule graph builder. 
The new algorithm remembers the uses encountered while walking backwards
until a matching def is found. Contrary to the previous version this:
- Works without LiveIntervals being available
- Allows to increase the precision to subregisters/lanemasks
  (not used for now)

The changes in the AMDGPU tests are necessary because the R600 scheduler
is not stable with respect to the order of nodes in the ready queues.

Differential Revision: http://reviews.llvm.org/D9068

llvm-svn: 254577
 2015-12-03 02:05:27 +00:00
Matt Arsenault 26f8f3db39 AMDGPU: Rework how private buffer passed for HSA 
If we know we have stack objects, we reserve the registers
that the private buffer resource and wave offset are passed
and use them directly.

If not, reserve the last 5 SGPRs just in case we need to spill.
After register allocation, try to pick the next available registers
instead of the last SGPRs, and then insert copies from the inputs
to the reserved registers in the progloue.

This also only selectively enables all of the input registers
which are really required instead of always enabling them.

llvm-svn: 254331
 2015-11-30 21:16:03 +00:00