This is not safe for all inputs.

llvm-svn: 49458

- Added insert_subreg coalescing support.

llvm-svn: 49448

llvm-svn: 49446

is needed for the x86-64-ABI handling of structs that contain floating-point
members that are returned by value.

llvm-svn: 49441

llvm-svn: 49440

figuring out the suffix to use.  implement pow(2,x) -> exp2(x).

llvm-svn: 49437

long double and simplify the code.

llvm-svn: 49435

llvm-svn: 49430

GVN and into its own pass.

llvm-svn: 49419

llvm-svn: 49418

particular value but variable type.

llvm-svn: 49416

llvm-svn: 49415

start migrating code over to use it.

llvm-svn: 49413

add support for  pow(x, 2.0) -> x*x.

llvm-svn: 49411

llvm-svn: 49389

attribute for a function.

llvm-svn: 49373

llvm-svn: 49367

correctly when unwind info is being generated.

llvm-svn: 49366

Corresponds to -fno-unwind-tables (usually default in gcc).

llvm-svn: 49361

llvm-svn: 49354

llvm-svn: 49352

review feedback from Chris quite a while ago. No functionality
change.

llvm-svn: 49348

in both time and memory savings for GVN.  For example, one testcase went from 10.5s to 6s with
this patch.

llvm-svn: 49345

llvm-svn: 49339

llvm-svn: 49338

needs to be fixed here - a previous commit made sure
that intrinsics always get the right attributes.
So remove no-longer needed code, and while there use
Intrinsic::getDeclaration rather than getOrInsertFunction. 

llvm-svn: 49337

intrinsics.  Fix up the argument type (should
be i8*, was an array*).

llvm-svn: 49336

right parameter attributes no matter how they
are obtained.

llvm-svn: 49335

by Dan Gohman is fixed.

llvm-svn: 49330

allocations, which GVN can't optimize anyways.

llvm-svn: 49329

nounwind.  When such calls are inlined into something
else that is invoked, they were getting changed to invokes,
which is badness.

llvm-svn: 49299

llvm-svn: 49293

llvm-svn: 49285

llvm-svn: 49284

llvm-svn: 49283

llvm-svn: 49282

If it cannot be expanded, it will keep the old behaviour and try to shrink the constant.
Part of enhancement for PR2191.

llvm-svn: 49280

Specifically, introduction of XXX::Create methods
for Users that have a potentially variable number of
Uses.

llvm-svn: 49277

llvm-svn: 49248

2. Coalescer can now create an interesting situation where a register def can
   reaches itself without being killed.

llvm-svn: 49246