The vector may actually be empty if the register that we are marking as
recently used is not actually allocatable.  This happens for physical registers
that are not allocatable, like the ST(x) registers on X86.

llvm-svn: 14195

printed incorrectly, and we were reserving 8 extra bytes of stack space for functions
on X86.

llvm-svn: 14152

targets whose stack grows up.

Patch contributed by Vladimir Prus

llvm-svn: 14111

llvm-svn: 13958

llvm-svn: 13957

llvm-svn: 13956

llvm-svn: 13955

llvm-svn: 13948

llvm-svn: 13947

llvm-svn: 13910

spills. This allows for more flexibility when allocating registers for
spill code.

llvm-svn: 13907

llvm-svn: 13903

new one.

llvm-svn: 13895

registers in the function has changed.

llvm-svn: 13893

llvm-svn: 13892

llvm-svn: 13881

llvm-svn: 13783

llvm-svn: 13782

Moved MachineBasicBlock deconstructor to cpp file and removed it from LeakDetector to fix memory leak bug.

llvm-svn: 13718

to set the parent when a MachineBasicBlock is added to a MachineFunction.

llvm-svn: 13716

which simplifies the code

llvm-svn: 13707

Changed copy constructor to set parent, prev, and next pointers to null.

llvm-svn: 13706

llvm-svn: 13665

llvm-svn: 13661

broke obsequi and a lot of other things.  It all boiled down to MBB being
overloaded in an inner scope and me confusing it with the one in the outer
scope.  Ugh!

llvm-svn: 13517

llvm-svn: 13515

MBBs start out as #-1. When a MBB is added to a MachineFunction, it
gets the next available unique MBB number. If it is removed from a
MachineFunction, it goes back to being #-1.

llvm-svn: 13514

phi-elimination from 0.6 to 0.54s on kc++.

llvm-svn: 13454

in the basic block being processed.  This fixes PhiElimination on kimwitu++
from taking 105s to taking a much more reasonable 0.6s (in a debug build).

llvm-svn: 13453

than before.  Because this is the case, we can compute the first non-phi
instruction once when de-phi'ing a block.  This shaves ~4s off of
phielimination of _Z7yyparsev in kimwitu++ from 109s -> 105s.  There are
still much more important gains to come.

llvm-svn: 13452

when we see a read of a register.  This is important in cases like:

AL = ...
AH = ...

   = AX

The read of AX must make both the AL and AH defs live until the use.

llvm-svn: 13444

llvm-svn: 13424

llvm-svn: 13417

llvm-svn: 13416

workaround, use the C HUGE_VAL macro instead.

llvm-svn: 13377

llvm-svn: 13302

use MachineBasicBlocks.  To do this, we traverse the Machine CFG instead of
the LLVM CFG, which is also *MUCH* more efficient by having fewer levels of
indirections and mappings.

llvm-svn: 13301

documentation that this module needs to be made independent of the
register file description of the current target.

llvm-svn: 13125

am not so sure about the file printer emitter, but the debug emitter change
should be harmless.)

llvm-svn: 13117

llvm-svn: 12872