a97abeb342
Change live interval representation. Machine instructions now have two
...
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
2004-02-05 22:55:25 +00:00
1165c1081e
We don't need to scan the blocks that we are live-in on every
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access. Rather we only have to do it on the creation of the interval.
llvm-svn: 11135
2004-02-05 20:45:40 +00:00
dd0c255d14
Added missing include.
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llvm-svn: 11129
2004-02-05 05:04:39 +00:00
327426411e
Modify the two address instruction pass to remove the duplicate
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operand of the instruction and thus simplify the register allocation.
llvm-svn: 11124
2004-02-04 22:17:40 +00:00
3d100ef0ca
When an instruction like: A += B had both A and B virtual registers
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spilled, A was loaded from its stack location twice. This fixes the bug.
llvm-svn: 11093
2004-02-03 01:13:07 +00:00
74b26f77a3
Revert changes. Will implement this using a different set of primitives
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llvm-svn: 11091
2004-02-02 23:08:58 +00:00
6e34205653
Fix debugging output.
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llvm-svn: 11088
2004-02-02 22:00:32 +00:00
6471e66fbb
Correctly update def/use information for modified machine operands.
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llvm-svn: 11087
2004-02-02 21:56:40 +00:00
86ff30deab
Should be more careful. The previously applied change made all counts
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outside of loops = 0.
llvm-svn: 11085
2004-02-02 20:29:57 +00:00
2cecace9b2
Create an object for tracking physical register usage. This will look
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much better when I get rid of the reserved registers.
llvm-svn: 11066
2004-02-02 07:30:36 +00:00
9b9c0485fd
Change weight array into a vector and make it as big as the number of
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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
2004-02-01 20:13:26 +00:00
5e05a59bf8
Use std::map::count() instead of std::map::find() != std::map::end()
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where appropriate.
llvm-svn: 11060
2004-02-01 18:39:53 +00:00
a3a56fa041
Change string for joined intervals.
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llvm-svn: 11057
2004-02-01 16:13:05 +00:00
84a84c38b7
Change xor to ^.
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llvm-svn: 11054
2004-02-01 08:19:25 +00:00
cae054f59f
Fix a bug in a recent checkin
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llvm-svn: 11050
2004-02-01 05:25:07 +00:00
8d4f06ed84
Missed one silly assert :-)
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llvm-svn: 11048
2004-02-01 02:21:31 +00:00
69deb4d236
Simplify joinIntervals() code.
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llvm-svn: 11047
2004-02-01 02:18:31 +00:00
91dcc03c39
Use MRegisterInfo::isPhysicalRegister and
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MRegisterInfo::isVirtualRegister.
llvm-svn: 11045
2004-02-01 01:27:01 +00:00
662bb3f495
Apply final part of Chris' patch.
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llvm-svn: 11040
2004-01-31 23:48:47 +00:00
459a67c309
Be a little smarter on the way we handle physical register defs.
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llvm-svn: 11038
2004-01-31 23:13:30 +00:00
c330b98c1c
Finegrainify namespacification, use new MRegisterInfo::isVirtualRegister
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method
llvm-svn: 11037
2004-01-31 21:27:19 +00:00
a2ef296994
Fix, correctly this time, the computation of the return value
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Fix a spello
Tighten up the assertion checking
No functionality changes.
llvm-svn: 11036
2004-01-31 21:21:43 +00:00
626f431165
* Fix incorrect computation of the runOnMachineFunction return value
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* Turn a bunch of instance variables into automatic variables
llvm-svn: 11035
2004-01-31 21:14:04 +00:00
d835aa6711
Remove unneeded #includes
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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
2004-01-31 21:07:15 +00:00
50d97e33b7
Merge safe parts from last night's buggy commit. These do not break
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any test cases :-)
llvm-svn: 11032
2004-01-31 19:59:32 +00:00
cdf48ab294
Optimize liveAt() and overlaps(). We now use a binary search instead
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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
2004-01-31 16:54:54 +00:00
26665e2636
Revert last night's changes as they broke some tests. Will remerge parts of the patch.
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llvm-svn: 11029
2004-01-31 14:37:41 +00:00
f2fb0fb486
Several performance enhancements and cleanups from Chris.
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Simplification of LiveIntervals::Interval::overlaps() and addition of
examples to overlaps() and liveAt() to make them clearer.
llvm-svn: 11028
2004-01-31 04:56:07 +00:00
0770862334
Finegrainify namespacification
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Implement LiveVariables::getIndexMachineBasicBlock
llvm-svn: 11018
2004-01-30 22:08:53 +00:00
845c0dd196
Give clients of MachineFunctionPrinter the ability to specify a banner and
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choose an ostream.
llvm-svn: 11016
2004-01-30 21:53:46 +00:00
59e3325c26
Fix failing test cases with joined live intervals. It turns out that
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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
2004-01-23 13:37:51 +00:00
73df113676
Add option to join live intervals. Two intervals are joined if there
...
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
2004-01-22 23:08:45 +00:00
e1c24c06f9
Remove unneeded check. An interval in active, by definition overlaps
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with the current one.
llvm-svn: 10959
2004-01-22 20:07:18 +00:00
4716d76d22
Improve debugging output. Remove unneeded virtReg->0 mapping when
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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
2004-01-22 19:24:43 +00:00
19638ab2bd
Revert previous change. The code was correct...
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llvm-svn: 10957
2004-01-22 19:17:52 +00:00
0aa9d0278d
Fix incorrect negatives in LiveIntervals::Interval::liveAt().
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llvm-svn: 10956
2004-01-22 18:33:50 +00:00
7117b9751d
Moved iterators around.
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llvm-svn: 10926
2004-01-20 17:51:13 +00:00
72494e04be
Moved iterators to common file.
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llvm-svn: 10925
2004-01-20 17:49:42 +00:00
d844972574
Handle printing of intervals that are not assign to any physical
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register yet (2nd try).
llvm-svn: 10896
2004-01-16 20:33:13 +00:00
8672af1cc8
Handle printing of intervals that are not assign to any physical
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register yet.
llvm-svn: 10895
2004-01-16 20:29:42 +00:00
d86933d21d
Fold open interval ends handling into
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LiveIntervals::Interval::expiredAt() and simplify regalloc code.
llvm-svn: 10894
2004-01-16 20:17:05 +00:00
e9c6ba891e
Add asserts to previous change.
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llvm-svn: 10893
2004-01-16 16:23:23 +00:00
3010b3e38e
Use a list instead of a vector to store intervals. This will be needed
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when we join intervals and one of the two will need to be removed.
llvm-svn: 10892
2004-01-16 16:06:59 +00:00
0680572553
Properly update #intervals statistic.
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llvm-svn: 10847
2004-01-14 10:44:29 +00:00
2615c98042
Fix bug in LiveIntervals::Interval::overlaps and
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LiveIntervals::Interval::liveAt. Both were considering the live ranges
closed in the end, when they are actually open.
llvm-svn: 10835
2004-01-14 00:20:09 +00:00
a0865cec3f
Improve debugging output.
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llvm-svn: 10834
2004-01-14 00:09:36 +00:00
0431621429
Fix miscomputation of live intervals. The catch is that registers can
...
be dead at the defining instruction but can only be killed in
subsequent ones.
llvm-svn: 10833
2004-01-13 22:26:14 +00:00
1a01c80f1b
Remove allocatable registers vector. It is already provided by
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LiveVariables.
llvm-svn: 10830
2004-01-13 22:10:43 +00:00
13e8623a3f
Cleanup debugging output.
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llvm-svn: 10824
2004-01-13 21:53:20 +00:00
33f9cb1da7
Fix output of live intervals to show correctly its closed, open
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ranges, i.e. [a,b)
llvm-svn: 10822
2004-01-13 21:17:47 +00:00
Alkis Evlogimenos