llvm-svn: 85640

unfolding loads for hoisting.  getOpcodeAfterMemoryUnfold returns the
opcode of the original operation without the load, not the load
itself, MachineLICM needs to know the operand index in order to get
the correct register class. Extend getOpcodeAfterMemoryUnfold to
return this information.

llvm-svn: 85622

otherwise unhoistable instructions in order to allow the loads
to be hoisted.

llvm-svn: 85364

MachineLICM and other things which run before LiveVariables is run.

llvm-svn: 85360

llvm-svn: 84431

llvm-svn: 83009

physical registers. This is especially critical for the later two since they
start the live interval of a super-register. e.g.
%DO<def> = INSERT_SUBREG %D0<undef>, %S0<kill>, 1
If this instruction is eliminated, the register scavenger will not be happy as
D0 is not defined previously.
This fixes PR5055.

llvm-svn: 82968

llvm-svn: 82825