llvm-svn: 136759

  - use SmallVectorImpl& for the function argument.
  - ignore the operands on the GEP, even if they aren't constant! Much as we
    pretend the malloc succeeds, we pretend that malloc + whatever-you-GEP'd-by
    is not null. It's magic!

llvm-svn: 136757

Add this back in for now. There are still a few passes which create unwind instructions at the moment.

llvm-svn: 136756

Don't replace a gep/bitcast with 'undef' because that will form a "free(undef)"
which in turn means "unreachable". What we wanted was a no-op. Instead, analyze
the whole tree and look for all the instructions we need to delete first, then
delete them second, not relying on the use_list to stay consistent.

llvm-svn: 136752

the function, because the UnwindInst is going away.

llvm-svn: 136751

llvm-svn: 136742

This information is not used for anything yet.

llvm-svn: 136741

With a 'FirstDef' field right there, it is very confusing that FirstUse
refers to an instruction that may be a def.

llvm-svn: 136739

llvm-svn: 136738

ARM backend support for atomicrmw and cmpxchg with non-monotonic ordering.  Not especially pretty, but seems to work well enough.  If this looks okay, I'll put together similar patches for Mips, PPC, and Alpha.

llvm-svn: 136737

This is either an invalid SlotIndex, or valno->def for the first value
defined inside the block. PHI values are not counted as defined inside
the block.

The FirstDef field will be used when estimating the cost of spilling
around a block.

llvm-svn: 136736

llvm-svn: 136735

malloc call.

llvm-svn: 136732

The PrefBoth constraint is used for blocks that ideally want a live-in
value both on the stack and in a register. This would be used by a block
that has a use before interference forces a spill.

Secondly, add the ChangesValue flag to BlockConstraint. This tells
SpillPlacement if a live-in value on the stack can be reused as a
live-out stack value for free. If the block redefines the virtual
register, a spill would be required for that.

This extra information will be used by SpillPlacement to more accurately
calculate spill costs when a value can exist both on the stack and in a
register.

The simplest example is a basic block that reads the virtual register,
but doesn't change its value. Spilling around such a block requires a
reload, but no spill in the block.

The spiller already knows this, but the spill placer doesn't. That can
sometimes lead to suboptimal regions.

llvm-svn: 136731

instruction's documentation to reference the landingpad and resume instructions.

llvm-svn: 136729

llvm-svn: 136727

but it solves a layering violation since things in Support are not supposed to
use things in Transforms.

llvm-svn: 136726

llvm-svn: 136723

llvm-svn: 136722

llvm-svn: 136721

llvm-svn: 136718

externally visable, create a local symbol to use in the CFE. If not, use the
function label itself.

Fixes PR10420.

llvm-svn: 136716

The testcase looks extremely fragile, so I'm adding an assertion which should catch any cases like this.

llvm-svn: 136711

Fix the broken encodings for the VFP vmov.f32 and vmov.f64 instructions, as well as the comments that explain them incorrectly.

llvm-svn: 136707

llvm-svn: 136705

Use a more descriptive name so the code is more self-documenting.

llvm-svn: 136704

This unbreaks some tests.

llvm-svn: 136692

  shuffle (scalar_to_vector (load (ptr + 4))), undef, <0, 0, 0, 0>
To:
  shuffle (vload ptr)), undef, <1, 1, 1, 1>
Fix PR10494

llvm-svn: 136691

llvm-svn: 136690

to compile a working hello world on FreeBSD/PPC32.

llvm-svn: 136689

llvm-svn: 136684

The 'unwind' function is going away with the new EH rewrite. This is step 0 in
keeping front-ends from using it.

llvm-svn: 136683

llvm-svn: 136677

llvm-svn: 136675

Revert r136503 and r136480 in an effort to fix non-determinism in the llvm-gcc buildbots on i386.  Devang is looking into the root cause.

llvm-svn: 136674

for awhile, but it's good to make this official.  

Just to be clear, Doug and Ted "elected" me to this position.

Might as well add myself to the credits list while I'm at it.

llvm-svn: 136673

llvm-svn: 136668

llvm-svn: 136665

Krasin!

llvm-svn: 136663

Make the FixedLengthDecoderEmitter smart enough to autogenerate decoders for encodings like "let Inst{11-7} = foo;", where the RHS has no bitwidth specifiers.

llvm-svn: 136660