Do not record line number to implicitly mark start of function if function has arguments. Extra line number entries trip gdb in some cases.

llvm-svn: 83563

llvm-svn: 83556

to declare that they preserve other passes without needing to pull in
additional header file or library dependencies. Convert MachineFunctionPass
and CodeGenLICM to make use of this.

llvm-svn: 83555

llvm-svn: 83549

"LoopVR's logic was copied into ScalarEvolution::getUnsignedRange and 
::getSignedRange. Please delete LoopVR."

llvm-svn: 83531

llvm-svn: 83526

llvm-svn: 83522

llvm-svn: 83521

bugfix. The target may use virtual registers that aren't tracked for re-use but are allocated by the scavenger. The re-use algorithm needs to watch for that.

llvm-svn: 83519

llvm-svn: 83518

llvm-svn: 83513

already on the worklist, and print Visited when an instruction is about to be
visited.  Net, on one input, this reduced the output size by at least 9x.

llvm-svn: 83510

llvm-svn: 83508

llvm-svn: 83506

llvm-svn: 83502

llvm-svn: 83501

llvm-svn: 83500

llvm-svn: 83499

llvm-svn: 83496

llvm-svn: 83494

llvm-svn: 83491

llvm-svn: 83490

llvm-svn: 83489

that a symbol stub section with no attributes can be parsed as in:
.section __TEXT,__picsymbolstub4,symbol_stubs,none,16

llvm-svn: 83488

llvm-svn: 83486

llvm-svn: 83484

llvm-svn: 83483

llvm-svn: 83482

llvm-svn: 83481

to finish it any time soon.  If someone's interested it, they can resurrect it from SVN history.

llvm-svn: 83480

llvm-svn: 83479

with writeback, things like "sp!", etc.  Also added some more stuff to the
temporarily hacked methods ARMAsmParser::MatchRegisterName and
ARMAsmParser::MatchInstruction to allow more parser testing.

llvm-svn: 83477

teach it how to recognize invariant physical registers.

llvm-svn: 83476

implementations with a new MachineInstr::isInvariantLoad, which uses
MachineMemOperands and is target-independent. This brings MachineLICM
and other functionality to targets which previously lacked an
isInvariantLoad implementation.

llvm-svn: 83475

llvm-svn: 83474

llvm-svn: 83471

This is just to be more consistent with the forthcoming code for vld3/4.

llvm-svn: 83470

a virtual register to eliminate a frame index, it can return that register
and the constant stored there to PEI to track. When scavenging to allocate
for those registers, PEI then tracks the last-used register and value, and
if it is still available and matches the value for the next index, reuses
the existing value rather and removes the re-materialization instructions.
Fancier tracking and adjustment of scavenger allocations to keep more
values live for longer is possible, but not yet implemented and would likely
be better done via a different, less special-purpose, approach to the
problem.

eliminateFrameIndex() is modified so the target implementations can return
the registers they wish to be tracked for reuse.

ARM Thumb1 implements and utilizes the new mechanism. All other targets are
simply modified to adjust for the changed eliminateFrameIndex() prototype.

llvm-svn: 83467

llvm-svn: 83462

llvm-svn: 83457