of the virtual register to certain functions.

llvm-svn: 11143

slots each. As a concequence they get numbered as 0, 2, 4 and so
on. The first slot is used for operand uses and the second for
defs. Here's an example:

0: A = ...
2: B = ...
4: C = A + B ;; last use of A

The live intervals should look like:

A = [1, 5)
B = [3, x)
C = [5, y)

llvm-svn: 11141

access. Rather we only have to do it on the creation of the interval.

llvm-svn: 11135

llvm-svn: 11129

operand of the instruction and thus simplify the register allocation.

llvm-svn: 11124

spilled, A was loaded from its stack location twice. This fixes the bug.

llvm-svn: 11093

llvm-svn: 11091

llvm-svn: 11088

llvm-svn: 11087

outside of loops = 0.

llvm-svn: 11085

much better when I get rid of the reserved registers.

llvm-svn: 11066

registers (not as the max number of registers).

Change toSpill from a std::set into a std::vector<bool>.

Use the reverse iterator adapter to do a reverse scan of allocatable
registers.

llvm-svn: 11061

where appropriate.

llvm-svn: 11060

llvm-svn: 11057

llvm-svn: 11054

llvm-svn: 11050

llvm-svn: 11048

llvm-svn: 11047

MRegisterInfo::isVirtualRegister.

llvm-svn: 11045

llvm-svn: 11040

llvm-svn: 11038

method

llvm-svn: 11037

Fix a spello
Tighten up the assertion checking

No functionality changes.

llvm-svn: 11036

* Turn a bunch of instance variables into automatic variables

llvm-svn: 11035

Move Passes.h (which defines the interface to this file) to the top.
Move statistics to the top of the file.
Add a comment

llvm-svn: 11034

any test cases :-)

llvm-svn: 11032

of a linear search to find the first range for comparisons. This cuts
down the linear scan register allocator running time by a factor of 3
in 254.perlbmk and by a factor of 2.2 in 176.gcc.

llvm-svn: 11030

llvm-svn: 11029

Simplification of LiveIntervals::Interval::overlaps() and addition of
examples to overlaps() and liveAt() to make them clearer.

llvm-svn: 11028

Implement LiveVariables::getIndexMachineBasicBlock

llvm-svn: 11018

choose an ostream.

llvm-svn: 11016

when joining we need to check if we overlap with the second interval
or any of its aliases.

Also make joining intervals the default.

llvm-svn: 10973

is a move between two registers, at least one of the registers is
virtual and the two live intervals do not overlap.

This results in about 40% reduction in intervals, 30% decrease in the
register allocators running time and a 20% increase in peephole
optimizations (mainly move eliminations).

The option can be enabled by passing -join-liveintervals where
appropriate.

llvm-svn: 10965

with the current one.

llvm-svn: 10959

virtReg lives on the stack. Now a virtual register has an entry in the
virtual->physical map or the virtual->stack slot map but never in
both.

llvm-svn: 10958

llvm-svn: 10957

llvm-svn: 10956

llvm-svn: 10926

Moved iterators to common file.

llvm-svn: 10925

register yet (2nd try).

llvm-svn: 10896