Interval.  This generalizes the isDefinedOnce mechanism that we used before
to help us coallesce ranges that overlap.  As part of this, every logical
range with a different value is assigned a different number in the interval.
For example, for code that looks like this:

0  X = ...
4  X += ...
  ...
N    = X

We now generate a live interval that contains two ranges: [2,6:0),[6,?:1)
reflecting the fact that there are two different values in the range at
different positions in the code.

Currently we are not using this information at all, so this just slows down
liveintervals.  In the future, this will change.

Note that this change also substantially refactors the joinIntervalsInMachineBB
method to merge the cases for virt-virt and phys-virt joining into a single
case, adds comments, and makes the code a bit easier to follow.

llvm-svn: 15154

make overlapsAliases take pointers instead of references
fix indentation

llvm-svn: 15153

* Fix comment typeo
* add dump() methods
* add a few new methods like getLiveRangeContaining, removeRange & joinable
  (which is currently the same as overlaps)
* Remove the unused operator==

Bigger change:

* In LiveInterval, instead of using a boolean isDefinedOnce to keep track of
  if there are > 1 definitions in a particular interval, keep a counter,
  NumValues to keep track of exactly how many there are.
* In LiveRange, add a new ValId element to indicate which of the numbered
  values each LiveRange belongs to.   We now no longer merge LiveRanges if
  they are of differing value ID's even if they are neighbors.

llvm-svn: 15152

have a nightly tester set up for PowerPC.

llvm-svn: 15147

llvm-svn: 15146

llvm-svn: 15145

 * Inline some functions
 * Eliminate some comparisons from the release build

This is good for another .3 on gcc.

llvm-svn: 15144

llvm-svn: 15143

llvm-svn: 15142

want to insert a new range into the middle of the vector, then delete ranges
one at a time next to the inserted one as they are merged.

Instead, if the inserted interval overlaps, just start merging.  The only time
we insert into the middle of the vector is when we don't overlap at all.  Also
delete blocks of live ranges if we overlap with many of them.

This patch speeds up joining by .7 seconds on a large testcase, but more
importantly gets all of the range adding code into addRangeFrom.

llvm-svn: 15141

(e.g., LICM) into FunctionPassManagers. The problem is that we were
using a C-style cast to cast required analysis passes to PassClass*, but
if it's a FunctionPassManager, and the required analysis pass is an
ImmutablePass, the types aren't really compatible, so the C-style cast
causes a crash.

llvm-svn: 15140

comparisons, reducing linscan by another .1 seconds :)

llvm-svn: 15139

llvm-svn: 15138

llvm-svn: 15137

a very modest speedup of .3 seconds compiling 176.gcc (out of 20s).

llvm-svn: 15136

llvm-svn: 15135

will soon be renamed) into their own file.  The new file should not emit
DEBUG output or have other side effects.  The LiveInterval class also now
doesn't know whether its working on registers or some other thing.

In the future we will want to use the LiveInterval class and friends to do
stack packing.  In addition to a code simplification, this will allow us to
do it more easily.

llvm-svn: 15134

* Function pointers implemented correctly using appropriate stubs

Contributed by Nate Begeman.

llvm-svn: 15133

standards.  This is in hopes of fixing configuration problems on
Windows Services for Unix.

llvm-svn: 15132

Use an explicit LiveRange class to represent ranges instead of an std::pair.
This is a minor cleanup, but is really intended to make a future patch simpler
and less invasive.

Alkis, could you please take a look at LiveInterval::liveAt?  I suspect that
you can add an operator<(unsigned) to LiveRange, allowing us to speed up the
upper_bound call by quite a bit (this would also apply to other callers of
upper/lower_bound).  I would do it myself, but I still don't understand that
crazy liveAt function, despite the comment. :)

Basically I would like to see this:
    LiveRange dummy(index, index+1);
    Ranges::const_iterator r = std::upper_bound(ranges.begin(),
                                                ranges.end(),
                                                dummy);

Turn into:
    Ranges::const_iterator r = std::upper_bound(ranges.begin(),
                                                ranges.end(),
                                                index);

llvm-svn: 15130

llvm-svn: 15129

the live intervals for some registers.

llvm-svn: 15125

interfere.  Because these intervals have a single definition, and one of them
is a copy instruction, they are always safe to merge even if their lifetimes
interfere.  This slightly reduces the amount of spill code, for example on
252.eon, from:

 12837 spiller               - Number of loads added
  7604 spiller               - Number of stores added
  5842 spiller               - Number of register spills
 18155 liveintervals         - Number of identity moves eliminated after coalescing

to:

  12754 spiller               - Number of loads added
   7585 spiller               - Number of stores added
   5803 spiller               - Number of register spills
  18262 liveintervals         - Number of identity moves eliminated after coalescing

The much much bigger win would be to merge intervals with multiple definitions
(aka phi nodes) but this is not that day.

llvm-svn: 15124

* Print out another '\n' after printing out program execution status
* Make sure code wraps at 80 cols

llvm-svn: 15123

llvm-svn: 15122

* Fix indentation back to 2 spaces

llvm-svn: 15121

* Convert tabs to spaces

llvm-svn: 15120

* Fix spacing

llvm-svn: 15119

llvm-svn: 15118

llvm-svn: 15117

llvm-svn: 15116

llvm-svn: 15115

llvm-svn: 15114

it can be ressurected from CVS.

llvm-svn: 15113

again in the future, it can be resurrected out of CVS

llvm-svn: 15112

llvm-svn: 15111

* Don't allow negative immediates to users of unsigned immediates
* Fix long compares
* Support <const int>, op as a potential immediate candidate
* Fix sign extension of short and byte loads
* Fix and improve integer casts
* Fix passing of doubles as vararg functions

Patch contributed by Nate Begeman.

llvm-svn: 15109

llvm-svn: 15108

llvm-svn: 15107

intervals need not be sorted anymore. Removing this redundant step
improves LiveIntervals running time by 5% on 176.gcc.

llvm-svn: 15106