the iterator hints we have to speed up overlaps().  This speeds linscan up
by about .2s (out of 8.7) on 175.vpr for PPC.

llvm-svn: 17935

* Eliminate the releaseMemory method, this is not an analysis
* Change the fixed, active, and inactive lists of intervals to maintain an
  iterator for the current position in the interval.  This allows us to do
  constant time increments of the iterator instead of having to do a binary
  search to find our liverange in our liveinterval all of the time, which
  substantially speeds up cases where LiveIntervals have many LiveRanges
  - which is very common for physical registers.  On targets with many
  physregs, this can make a noticable difference.

  With a release build of LLC for PPC, this halves the time in
  processInactiveIntervals and processActiveIntervals, from 1.5s to .75s.

  This also lays the ground for more to come.

llvm-svn: 17933

iterator/begin/end members.

llvm-svn: 17930

llvm-svn: 17483

the beginning of processing the next one.

llvm-svn: 16605

Patch contributed by Paolo Invernizzi!

llvm-svn: 16152

free allocatable register, we prefer the a free one with the most uses
of inactive intervals. This causes less spills and performes a bit
better compared to gcc:

Program                 | GCC/LLC (Before)| GCC/LLC (After)
164.gzip/164.gzip       | 0.59            | 0.60
175.vpr/175.vpr         | 0.57            | 0.58
176.gcc/176.gcc         | 0.59            | 0.61
181.mcf/181.mcf         | 0.94            | 0.95
186.crafty/186.crafty   | 0.62            | 0.62
197.parser/197.parser   | 0.89            | 0.88
252.eon/252.eon         | 0.61            | 0.66
253.perlbmk/253.perlbmk | 0.79            | 0.84
254.gap/254.gap         | 0.81            | 0.81
255.vortex/255.vortex   | 0.92            | 0.93
256.bzip2/256.bzip2     | 0.69            | 0.69
300.twolf/300.twolf     | 0.91            | 0.90

llvm-svn: 16147

stored in a binary heap.

llvm-svn: 16143

Move include/Config and include/Support into include/llvm/Config,
include/llvm/ADT and include/llvm/Support. From here on out, all LLVM
public header files must be under include/llvm/.

llvm-svn: 16137

lists. Instead of scanning the vector backwards, scan it forward and
swap each element we want to erase. Then at the end erase all removed
intervals at once. This doesn't save much: 0.08s out of 4s when
compiling 176.gcc.

llvm-svn: 16136

LiveVariables.

llvm-svn: 16076

investicated further as the linearscan variants don't really need
LiveVariables...

llvm-svn: 16074

llvm-svn: 16071

llvm-svn: 15489

llvm-svn: 15200

LiveInterval>. This saves some space and removes the pointer
indirection caused by following the pointer.

llvm-svn: 15167

ownership of the intervals.

llvm-svn: 15155

llvm-svn: 15135

compilation of gcc:

* Use vectors instead of lists for the intervals sets
* Use a heap for the unhandled set to keep intervals always sorted and
  makes insertions back to the heap very fast (compared to scanning a
  list)

llvm-svn: 15103

llvm-svn: 15089

llvm-svn: 15011

llvm-svn: 14991

is sorted.  This is not the case currently, which is causing no end of
problems.

llvm-svn: 14990

llvm-svn: 14626

llvm-svn: 14590

existing llvm::Interval class.

Patch contributed by Vladimir Prus!
http://mail.cs.uiuc.edu/pipermail/llvmbugs/2004-June/000710.html

llvm-svn: 14281

llvm-svn: 13910

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

llvm-svn: 13907

llvm-svn: 13417

workaround, use the C HUGE_VAL macro instead.

llvm-svn: 13377

unhandled + handled. So unhandled is now including all fixed intervals
and fixed intervals never changes when processing a function.

llvm-svn: 12462

Add a spiller option to llc. A simple spiller will come soon. When we get CFG in the machine code represenation a global spiller will also be possible. Also document the linear scan register allocator but mark it as experimental for now.

llvm-svn: 12062

llvm-svn: 12058

llvm-svn: 11898

llvm-svn: 11841

llvm-svn: 11830

allocator.

The implementation is completely rewritten and now employs several
optimizations not exercised before. For example for 164.gzip we have
997 loads and 699 stores vs the 1221 loads and 880 stores we have
before.

llvm-svn: 11798

llvm-svn: 11781

251 (providing a generic machine code rewriter/spiller).

llvm-svn: 11780

llvm-svn: 11759