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

PPC is such a target; make it work.

llvm-svn: 87060

llvm-svn: 87040

llvm-svn: 87036

Do some cleanups suggested by Chris.

llvm-svn: 87034

Set the ReloadReuse AsmPrinter flag where appropriate.

llvm-svn: 87030

llvm-svn: 87024

and don't assume that the call doesn't throw. It would be nice if there were a
way to determine which is the callee and which is a parameter. In practice, the
architecture we care about normally only have one operand for a call instruction
(x86 and arm).

llvm-svn: 87023

Add a bool flag to StackObjects telling whether they reference spill
slots.  The AsmPrinter will use this information to determine whether to
print a spill/reload comment.

Remove default argument values.  It's too easy to pass a wrong argument
value when multiple arguments have default values.  Make everything
explicit to trap bugs early.

Update all targets to adhere to the new interfaces..

llvm-svn: 87022

StringsEqualNoCase (from StringExtras.h) to it.

llvm-svn: 87020

Make FixedStackPseudoSourceValue a first-class PseudoSourceValue by
making it visible to clients and adding LLVM-style cast capability.
This will be used by AsmPrinter to determine when to emit spill comments
for an instruction.

llvm-svn: 87019

llvm-svn: 87015

"Attach debug info with llvm instructions" mode was enabled a month ago. Now make it permanent and remove old way of inserting intrinsics to encode debug info for line number and scopes.

llvm-svn: 87014