llvm-svn: 153612

When an strd instruction doesn't get the registers it wants, it can be
expanded into two str instructions. Make sure the first str doesn't kill
the base register in the case where the base and data registers are
identical:

  t2STRi12 %R0<kill>, %R0, 4, pred:14, pred:%noreg
  t2STRi12 %R2<kill>, %R0, 8, pred:14, pred:%noreg

<rdar://problem/11101911>

llvm-svn: 153611

When a number of sub-register VLRDS instructions are combined into a
VLDM, preserve any super-register implicit defs. This is required to
keep the register scavenger and machine code verifier happy.

Enable machine code verification after ARMLoadStoreOptimizer.
ARM/2012-01-26-CopyPropKills.ll was failing because of this.

llvm-svn: 153610

llvm-svn: 153609

llvm-svn: 153607

llvm-svn: 153604

The arm_neon intrinsics can create virtual registers from the DPair
register class which allows both even-odd and odd-even D-register pairs.

This fixes PR12389.

llvm-svn: 153603

llvm-svn: 153599

llvm-svn: 153598

Branch folding invalidates liveness and disables liveness verification
on some targets.

llvm-svn: 153597

Extract the liveness verification into its own method.

This makes it possible to run the machine code verifier after liveness
information is no longer required to be valid.

llvm-svn: 153596

a bunch of comments for the various functions. No intended functionality change.

llvm-svn: 153595

Revert r153519: "ARMLoadStoreOptimizer invalidates register liveness."

These patches caused miscompilations in povray by turning off branch
folding's updating of live-in lists.

It turns out the the late scheduler depends on the live-in lists, even
if it doesn't need correct kill flags.

<rdar://problem/11139228>

llvm-svn: 153593

This avoids the silly double search:

  if (isLiveIn(Reg))
    removeLiveIn(Reg);

llvm-svn: 153592

Original commit message for r153521 (aka r153423):
Use the new range metadata in computeMaskedBits and add a new optimization to
instruction simplify that lets us remove an and when loding a boolean value.

llvm-svn: 153587

llvm-svn: 153579

GlobalOpt: If we have an inbounds GEP from a ConstantAggregateZero global that we just determined to be constant, replace all loads from it with a zero value.

llvm-svn: 153576

llvm-svn: 153574

llvm-svn: 153573

blocks in the function cloner. This removes the last case of trivially
dead code that I've been seeing in the wild getting inlined, analyzed,
re-inlined, optimized, only to be deleted. Nukes a FIXME from the
cleanup tests.

llvm-svn: 153572

llvm-svn: 153571

and not the rest of the member tag.

Fixes PR11695

llvm-svn: 153570

llvm-svn: 153567

llvm-svn: 153564

llvm-svn: 153558

llvm-svn: 153557

llvm-svn: 153556

llvm-svn: 153555

llvm-svn: 153554

imposes a constraint that GOT16 referring to a local symbol or HI16 has to be
followed immediately by a matching LO16 relocation.

llvm-svn: 153553

them as machine instructions. Directives ".set noat" and ".set at" are now
emitted only at the beginning and end of a function except in the case where
they are emitted to enclose .cpload with an immediate operand that doesn't fit
in 16-bit field or unaligned load/stores.

Also, make the following changes:
- Remove function isUnalignedLoadStore and use a switch-case statement to
  determine whether an instruction is an unaligned load or store.

- Define helper function CreateMCInst which generates an instance of an MCInst
  from an opcode and a list of operands.

llvm-svn: 153552

any side effects.

llvm-svn: 153551

llvm-svn: 153549

llvm-svn: 153543

llvm-svn: 153542

executable has been moved to another machine). If that's not available
(read-only or something), then exit gracefully.
<rdar://problem/11111686>

llvm-svn: 153538

llvm-svn: 153536

will always be tiny sets, so DenseSet is overkill (SmallSet won't work as we
need iteration support). 

llvm-svn: 153529

If EmitNOAT is true, directives ".set noat" and ".set at" are emitted at the
beginning and end of a function. 

llvm-svn: 153528

testing a) the wrong behavior or b) something that I'm already testing
in the new test.

llvm-svn: 153525