Revert 86857. It's causing consumer-typeset to fail, and there's a better way to do it forthcoming anyway.

llvm-svn: 86945

otherwise create a stub.

Add a test to make sure we don't create extraneous stubs.

llvm-svn: 86941

llvm-svn: 86933

CreateNSWSub functions.

llvm-svn: 86930

llvm-svn: 86929

llvm-svn: 86928

llvm-svn: 86927

llvm-svn: 86926

allows us to handle the test10 testcase.

llvm-svn: 86924

llvm-svn: 86923

llvm-svn: 86920

Fixed an iteration condition in PreAllocSplitting. This should fix some miscompilations casued by PreAllocSplitting.

llvm-svn: 86919

the basic.ll testcase.

llvm-svn: 86918

llvm-svn: 86917

This allows StringRef to skip controversial if(str) check in constructor.
Buildbots, wait for corresponding clang and llvm-gcc FE check-ins!

llvm-svn: 86914

can be made to fall through into the other.

llvm-svn: 86909

"nounwind" attribute.

llvm-svn: 86897

llvm-svn: 86895

strswitch.

llvm-svn: 86889

uses LVI info when -enable-jump-threading-lvi is passed.

llvm-svn: 86886

instead of typedefs for std::pair. This simplifies the type of
SameTails, which previously was std::vector<std::pair<std::vector<std::pair<unsigned, MachineBasicBlock *> >::iterator, MachineBasicBlock::iterator>

llvm-svn: 86885

x86 users can now return arbitrary sized structs.  Structs too large to fit in return registers will be returned through a hidden sret parameter introduced during SelectionDAG construction.

llvm-svn: 86876

llvm-svn: 86875

llvm-svn: 86874

llvm-svn: 86873

tail merging support to handle more cases.
 - Recognize several cases where tail merging is beneficial even when
   the tail size is smaller than the generic threshold.
 - Make use of MachineInstrDesc::isBarrier to help detect
   non-fallthrough blocks.
 - Check for and avoid disrupting fall-through edges in more cases.

llvm-svn: 86871

- Edges are split before any phis are eliminated, so the code is SSA.

- Create a proper IR BasicBlock for the split edges.

- LiveVariables::addNewBlock now has same syntax as
  MachineDominatorTree::addNewBlock. Algorithm calculates predecessor live-out
  set rather than successor live-in set.

This feature still causes some miscompilations.

llvm-svn: 86867

llvm-svn: 86861

add debug info location to an instruction.

llvm-svn: 86859

Add TargetLowering::isLegalICmpImmediate. It tells LSR what immediate can be folded into target icmp instructions.

llvm-svn: 86858

llvm-svn: 86857

llvm-svn: 86856

llvm-svn: 86855

the numbers mean.

llvm-svn: 86854

llvm-svn: 86853

llvm-svn: 86852

llvm-svn: 86851

llvm-svn: 86850

llvm-svn: 86848

llvm-svn: 86847