more than one place. No intended functionality change.

llvm-svn: 89024

llvm-svn: 89021

unconditional branches or fallthroghes. Instcombine/SimplifyCFG
should be simplifying branches with known conditions.

This fixes some problems caused by these transformations not
updating the MachineBasicBlock CFG.

llvm-svn: 89017

uninitialized memory.

llvm-svn: 88985

llvm-svn: 88973

llvm-svn: 88956

llvm-svn: 88953

llvm-svn: 88940

llvm-svn: 88939

llvm-svn: 88932

llvm-svn: 88929

llvm-svn: 88927

Support spill comments.

Have the asm printer emit a comment if an instruction is a spill or
reload and have the spiller mark copies it introdues so the asm printer
can also annotate those.

llvm-svn: 88911

llvm-svn: 88899

llvm-svn: 88895

Make sure when ProcessImplicitDefs removes a copy which kills its source reg that it
removes the copy from said reg's Kills list.

llvm-svn: 88881

Fix for the original bug in PR5495 - Look at uses as well as defs when determining the PHI-copy insert point.

- Patch by Andrew Canis!

llvm-svn: 88880

Added an assert to the PBQP allocator to catch infinite cost solutions which might otherwise lead to miscompilations.

llvm-svn: 88829

merges, and until then, it's useful to keep the tables separate for ease
of manipulation.

llvm-svn: 88806

llvm-svn: 88804

llvm-svn: 88762

llvm-svn: 88761

Added getSubRegIndex(A,B) that returns subreg index of A to B. Use it to replace broken code in VirtRegRewriter.

llvm-svn: 88753

- If destination is a physical register and it has a subreg index, use the
  sub-register instead.
This fixes PR5423.

llvm-svn: 88745

llvm-svn: 88738

llvm-svn: 88737

When splitting an edge after a machine basic block with fall-through, we
forgot to insert a jump instruction. Fix this by calling updateTerminator() on
the fall-through block when relevant.

Also be more precise in PHIElimination::isLiveIn.

llvm-svn: 88728

llvm-svn: 88727

PreAllocSplitting is now using this API to insert code.

llvm-svn: 88725

llvm-svn: 88719

The BasicBlock associated with a MachineBasicBlock does not necessarily
correspond to the code in the MBB.

Don't insert a new IR BasicBlock when splitting critical edges. We are not
supposed to modify the IR during codegen, and we should be able to do just
fine with a NULL BB.

llvm-svn: 88707

llvm-svn: 88706

llvm-svn: 88704

llvm-svn: 88703

Move DebugInfo checks into EmitComments and remove them from
target-specific AsmPrinters.  Not all comments need DebugInfo.

Re-enable the line numbers comment test.

llvm-svn: 88697

code-size win, and not when it's only likely to be code-size neutral,
such as when only a single instruction would be eliminated and a new
branch would be required.

This fixes rdar://7392894.

llvm-svn: 88692

D0<def,dead> = ...
...
             = S0<use, kill>
S0<def>      = ...
...
D0<def>      = 

The first D0 def is correctly marked dead, however, livevariables should have
added an implicit def of S0 or we end up with a use without a def.

llvm-svn: 88690

llvm-svn: 88682

llvm-svn: 88672

llvm-svn: 87069