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

llvm-svn: 49246

kills the sub-register.

llvm-svn: 48038

Fixed a register scavenger bug. If a def is re-defining part of a super register, there must be an implicit def of the super-register on the MI.

llvm-svn: 48024

    %r3<def> = OR %x3<kill>, %x3

We don't want to mark the %r3 as unused even though it's a sub-register of %x3.

llvm-svn: 48003

findRegisterUseOperandIdx, findRegisterDefOperandIndx. Fix some naming inconsistencies.

llvm-svn: 47927

registers.

llvm-svn: 47861

llvm-svn: 47200

llvm-svn: 46930

Make MachineInstr::getDesc return a reference instead
of a pointer, since it can never be null.

llvm-svn: 45695

that it is cheap and efficient to get.

Move a variety of predicates from TargetInstrInfo into 
TargetInstrDescriptor, which makes it much easier to query a predicate
when you don't have TII around.  Now you can use MI->getDesc()->isBranch()
instead of going through TII, and this is much more efficient anyway. Not
all of the predicates have been moved over yet.

Update old code that used MI->getInstrDescriptor()->Flags to use the
new predicates in many places.

llvm-svn: 45674

llvm-svn: 45484

llvm-svn: 45418

the stored register is killed.

llvm-svn: 44600

isRegister, isImmediate, and isMachineBasicBlock, which are equivalent,
and more popular.

llvm-svn: 41958

llvm-svn: 37890

If call frame is not part of stack frame and no dynamic alloc, eliminateFrameIndex() must adjust SP offset with size of call frames.

llvm-svn: 36625

llvm-svn: 36483

llvm-svn: 35618

hopefully forestall similar errors.

llvm-svn: 35362

llvm-svn: 35226

llvm-svn: 34985

Register scavenger is now capable of scavenging. It spills a register whose use of furthest away to make it available.

llvm-svn: 34964

llvm-svn: 34844

llvm-svn: 34784

llvm-svn: 34770

llvm-svn: 34700

llvm-svn: 34698

llvm-svn: 34690

forward() should not increment internal iterator. Its client may insert instruction between now and next forward() call.

llvm-svn: 34649

llvm-svn: 34596

llvm-svn: 34525

Initial check in of register scavenger. Its only current functionality is tracking live registers per MBB.

llvm-svn: 34511