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14 Commits

Author SHA1 Message Date
Matthias Braun 4e8624d138 LiveRegUnits: Port recent LivePhysRegs bugfixes 
Adjust code to look more like the code in LivePhysRegs and port over the
fix for LivePhysRegs from r304001 and adapt to the new CSR management in
MachineRegisterInfo.

llvm-svn: 304622
 2017-06-03 00:26:35 +00:00
Eugene Zelenko 5db84df728 [CodeGen] Fix some Clang-tidy modernize and Include What You Use warnings; other minor fixes (NFC). 
llvm-svn: 295499
 2017-02-17 21:43:25 +00:00
Matthias Braun 28eae8f4e0 LiveRegUnits: Add accumulateBackward() function 
Re-Commit r292543 with a fix for the situation when the chain end is
MBB.end().

This function can be used to accumulate the set of all read and modified
register in a sequence of instructions.

Use this code in AArch64A57FPLoadBalancing::scavengeRegister() to prove
the concept.

- The AArch64A57LoadBalancing code is using a backwards analysis now
  which is irrespective of kill flags. This is the main motivation for
  this change.

Differential Revision: http://reviews.llvm.org/D22082

llvm-svn: 292705
 2017-01-21 02:21:04 +00:00
Matthias Braun d9217c0b86 Revert "LiveRegUnits: Add accumulateBackward() function" 
This seems to be breaking some bots.

This reverts commit r292543.

llvm-svn: 292574
 2017-01-20 03:58:42 +00:00
Matthias Braun 3ffeb68869 LiveRegUnits: Add accumulateBackward() function 
This function can be used to accumulate the set of all read and modified
register in a sequence of instructions.

Use this code in AArch64A57FPLoadBalancing::scavengeRegister() to prove
the concept.

- The AArch64A57LoadBalancing code is using a backwards analysis now
  which is irrespective of kill flags. This is the main motivation for
  this change.

Differential Revision: http://reviews.llvm.org/D22082

llvm-svn: 292543
 2017-01-20 00:16:17 +00:00
Matthias Braun 710a4c1f3d CodeGen: Add/Factor out LiveRegUnits class; NFCI 
This is a set of register units intended to track register liveness, it
is similar in spirit to LivePhysRegs.
You can also think of this as the liveness tracking parts of the
RegisterScavenger factored out into an own class.

This was proposed in http://llvm.org/PR27609

Differential Revision: http://reviews.llvm.org/D21916

llvm-svn: 292542
 2017-01-20 00:16:14 +00:00
Matthias Braun fdc4c6b426 Revert "RegScavenging: Add scavengeRegisterBackwards()" 
The ppc64 multistage bot fails on this.

This reverts commit r279124.

Also Revert "CodeGen: Add/Factor out LiveRegUnits class; NFCI" because it depends on the previous change
This reverts commit r279171.

llvm-svn: 279199
 2016-08-19 03:03:24 +00:00
Matthias Braun 91f95f0201 CodeGen: Add/Factor out LiveRegUnits class; NFCI 
This is a set of register units intended to track register liveness, it
is similar in spirit to LivePhysRegs.
You can also think of this as the liveness tracking parts of the
RegisterScavenger factored out into an own class.

This was proposed in http://llvm.org/PR27609

Differential Revision: http://reviews.llvm.org/D21916

llvm-svn: 279171
 2016-08-18 22:11:28 +00:00
Juergen Ributzka 310034e166 Convert register liveness tracking to work on a sub-register level instead of just register units. 
Reviewed by Andy

llvm-svn: 197315
 2013-12-14 06:52:56 +00:00
Andrew Trick 27709d0b3c Revert "Convert liveness tracking to work on a sub-register level instead of just register units." 
This reverts commit r197253.

This was a great change, but Juergen should be the commit author.

llvm-svn: 197262
 2013-12-13 19:04:08 +00:00
Andrew Trick 8df84fa2f2 Convert liveness tracking to work on a sub-register level instead of just register units. 
llvm-svn: 197253
 2013-12-13 18:36:56 +00:00
Andrew Trick e2f7cc4cf3 LiveRegUnits: Use *MBB for consistency and convenience. 
llvm-svn: 192634
 2013-10-14 22:18:59 +00:00
Andrew Trick 3f4d6c6538 LiveRegUnits::removeRegsInMask safety. 
Clobbering is exclusive not inclusive on register units.
For liveness, we need to consider all the preserved registers.
e.g. A regmask that clobbers YMM0 may preserve XMM0.
Units are only clobbered when all super-registers are clobbered.

llvm-svn: 192623
 2013-10-14 20:45:19 +00:00
Andrew Trick 0aed0cfc44 Move LiveRegUnits implementation into .cpp. Comment and format. 
llvm-svn: 192621
 2013-10-14 20:45:14 +00:00