LBB1_3:   # bb
...
        xorl    %ebp, %ebp
        subl    (%ebx), %ebp
...
        incl    %ecx
        cmpl    %edi, %ecx
        jl      LBB1_3  # bb

Whe using machine LICM, LLVM converts it into:

        xorl %esi, %esi
LBB1_3: # bb
...
        movl    %esi, %ebp
        subl    (%ebx), %ebp
...
        incl    %ecx
        cmpl    %edi, %ecx
        jl      LBB1_3  # bb

Two address conversion inserts the copy instruction. However, it's cheaper to
rematerialize it, and remat helps reduce register pressure.

llvm-svn: 51562

address of the PassInfo directly instead of calling getPassInfo.
This eliminates a bunch of dynamic initializations of static data.

Also, fold RegisterPassBase into PassInfo, make a bunch of its
data members const, and rearrange some code to initialize data
members in constructors instead of using setter member functions.

llvm-svn: 51022

several things that were neither in an anonymous namespace nor static
but not intended to be global.

llvm-svn: 51017

 - Comment fixes.
 - Moar whitespace.
 - Made ivars "private" by default.
No functionality change.

llvm-svn: 50926

llvm-svn: 48853

llvm-svn: 48337

Don't try to sink 3-address instruction if convertToThreeAddress created more than one instructions.

llvm-svn: 48336

llvm-svn: 48334

TwoAddressInstructionPass enhancement. After it converts a two address instruction into a 3-address one, sink it past the instruction that kills the read-mod-write register if its definition is used past the kill. This reduces the number of live register by one.

llvm-svn: 48333

findRegisterUseOperandIdx, findRegisterDefOperandIndx. Fix some naming inconsistencies.

llvm-svn: 47927

llvm-svn: 46930

llvm-svn: 46016

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

llvm-svn: 45695

all clients over to using predicates instead of these flags directly.
These are now private values which are only to be used to statically
initialize the tables.

llvm-svn: 45692

flags that can be set.  Add predicates for the ones lacking it, and switch
some clients over to using the predicates instead of Flags directly.

llvm-svn: 45690

llvm-svn: 45680

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

preserved.

llvm-svn: 45596

Machine-level API cleanup instigated by Chris.

llvm-svn: 45470

that "machine" classes are used to represent the current state of
the code being compiled.  Given this expanded name, we can start 
moving other stuff into it.  For now, move the UsedPhysRegs and
LiveIn/LoveOuts vectors from MachineFunction into it.

Update all the clients to match.

This also reduces some needless #includes, such as MachineModuleInfo
from MachineFunction.

llvm-svn: 45467

llvm-svn: 45418

to be a pass of its own.  Instead, move it out into a helper method.

llvm-svn: 44002

llvm-svn: 43911

llvm-svn: 43866

llvm-svn: 43256

llvm-svn: 43196

Tested with "make check"!

llvm-svn: 42346

llvm-svn: 36873

llvm-svn: 36662

Due to darwin gcc bug, one version of darwin linker coalesces
static const int, which defauts PassID based pass identification.

llvm-svn: 36652

llvm-svn: 36632

llvm-svn: 36250

llvm-svn: 35140

llvm-svn: 32698

llvm-svn: 32321

is 'unsigned'.

llvm-svn: 32279

llvm-svn: 32098

llvm-svn: 31985

llvm-svn: 31583

Two-address instructions no longer have to be A := A op C. Now any pair of dest / src operands can be tied together.

llvm-svn: 31363