c85535c8be
Now that MachineFunction/MachineBasicBlock keep a mapping of blocks to ID #'s
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use them instead of a local LiveVariables numbering
llvm-svn: 14523
2004-07-01 06:15:32 +00:00
6c375e4926
Start using MBB numbers directly instead of going through the live variables
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map.
llvm-svn: 14518
2004-07-01 04:29:47 +00:00
4cda555346
In line with the previous patch, do not assert out if analyzing a dead basic block.
...
llvm-svn: 14475
2004-06-29 07:16:23 +00:00
49b34f3f51
Do not dereference end iterators. It hurts when you do that.
...
llvm-svn: 14474
2004-06-29 06:56:51 +00:00
23dbc8170c
Made a fix so that you can print out MachineInstrs that belong to a MachineBasicBlock that is not yet attached to a MachineFunction. This change includes changing the third operand (TargetMachine) to a pointer for the MachineInstr::print function.
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llvm-svn: 14389
2004-06-25 00:13:11 +00:00
4fbff990b0
Rename Interval class to LiveInterval to avoid conflicting with the already
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existing llvm::Interval class.
Patch contributed by Vladimir Prus!
http://mail.cs.uiuc.edu/pipermail/llvmbugs/2004-June/000710.html
llvm-svn: 14281
2004-06-21 13:10:56 +00:00
2150542af9
Adjust to new TargetMachine interface
...
llvm-svn: 13956
2004-06-02 05:57:12 +00:00
fbe799cfa2
Pull Interval class out of LiveIntervals.
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llvm-svn: 13910
2004-05-30 07:46:27 +00:00
a5268e8199
When spilling an register, introduce a new temporary for each of its
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spills. This allows for more flexibility when allocating registers for
spill code.
llvm-svn: 13907
2004-05-30 07:24:39 +00:00
1010116a8f
Remove defs vector from live intervals.
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llvm-svn: 13892
2004-05-29 16:18:57 +00:00
54a89b7c72
Remove unneeded header
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llvm-svn: 13416
2004-05-08 03:49:35 +00:00
991425ae70
numeric_limits::infinity() apparently does not work on all systems. As a
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workaround, use the C HUGE_VAL macro instead.
llvm-svn: 13377
2004-05-06 16:25:59 +00:00
8c0bc68910
Operate on the Machine CFG instead of on the LLVM CFG
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llvm-svn: 13302
2004-05-01 21:24:39 +00:00
8f2df3aa3c
Fix bug introduced in previous commit.
...
llvm-svn: 12872
2004-04-12 20:26:39 +00:00
0ede7ec4f8
Correctly compute spill weights
...
llvm-svn: 12869
2004-04-12 17:39:20 +00:00
b753c8c9c5
Print def lists a bit more compactly
...
llvm-svn: 12866
2004-04-12 15:57:58 +00:00
237f203ca9
Add definition list to each live interval.
...
llvm-svn: 12791
2004-04-09 18:07:57 +00:00
48da2f8a6d
Change MRegisterInfo::foldMemoryOperand to return the folded
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instruction to make the API more flexible.
llvm-svn: 12386
2004-03-14 07:19:51 +00:00
b76d234ee9
Add the long awaited memory operand folding support for linear scan
...
llvm-svn: 12058
2004-03-01 20:05:10 +00:00
61719d48d2
Uncomment assertions that register# != 0 on calls to
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MRegisterInfo::is{Physical,Virtual}Register. Apply appropriate fixes
to relevant files.
llvm-svn: 11882
2004-02-26 22:00:20 +00:00
4d7ad6713d
Move LiveIntervals.h up to be the first included header
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llvm-svn: 11721
2004-02-23 01:01:21 +00:00
486b12b71a
Move LiveIntervals.h to lib/CodeGen since it shouldn't be exposed to other parts of the compiler
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llvm-svn: 11719
2004-02-23 00:50:15 +00:00
cb352300c9
Print basic block boundaries in machine instruction debug output.
...
llvm-svn: 11704
2004-02-22 05:46:04 +00:00
d890f59f19
Abstract merging of ranges away from number of slots per instruction.
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Also make it less aggressive as the current implementation breaks in
some cases.
llvm-svn: 11696
2004-02-22 04:05:13 +00:00
334114bdf1
Make 'fold' statistic's description the same in both allocators.
...
llvm-svn: 11687
2004-02-21 18:07:33 +00:00
6ad63f8da2
Some more statistics improvements.
...
llvm-svn: 11676
2004-02-20 20:53:26 +00:00
71751de25c
Disambiguate statistic descriptions.
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llvm-svn: 11675
2004-02-20 20:46:49 +00:00
f3e77fb7a7
Rename statistic and add another one.
...
llvm-svn: 11674
2004-02-20 20:43:08 +00:00
76eca062ea
Too many changes in one commit:
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1. LiveIntervals now implement a 4 slot per instruction model. Load,
Use, Def and a Store slot. This is required in order to correctly
represent caller saved register clobbering on function calls,
register reuse in the same instruction (def resues last use) and
also spill code added later by the allocator. The previous
representation (2 slots per instruction) was insufficient and as a
result was causing subtle bugs.
2. Fixes in spill code generation. This was the major cause of
failures in the test suite.
3. Linear scan now has core support for folding memory operands. This
is untested and not enabled (the live interval update function does
not attempt to fold loads/stores in instructions).
4. Lots of improvements in the debugging output of both live intervals
and linear scan. Give it a try... it is beautiful :-)
In summary the above fixes all the issues with the recent reserved
register elimination changes and get the allocator very close to the
next big step: folding memory operands.
llvm-svn: 11654
2004-02-20 06:15:40 +00:00
7bef0eafc0
Be more agressive when joining ranges.
...
llvm-svn: 11575
2004-02-18 04:38:37 +00:00
739e5e33d7
Fix overly conservative spill interval computation.
...
llvm-svn: 11574
2004-02-18 03:35:38 +00:00
4f7c2d9e5e
Fix spilled interval update. It was too conservative.
...
llvm-svn: 11516
2004-02-17 04:04:20 +00:00
2c5ddd20ba
Eliminate the use of spill (reserved) registers.
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llvm-svn: 11476
2004-02-15 10:24:21 +00:00
ddcb4ad53e
Use std::numeric_limits<float>::infinity() instead of
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std::numeric_limits<float>::max() for weighting preallocated
intervals.
llvm-svn: 11427
2004-02-14 00:44:07 +00:00
8cdd0215bf
Remove getAllocatedRegNum(). Use getReg() instead.
...
llvm-svn: 11393
2004-02-13 21:01:20 +00:00
80da865f77
Change MachineBasicBlock's vector of MachineInstr pointers into an
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ilist of MachineInstr objects. This allows constant time removal and
insertion of MachineInstr instances from anywhere in each
MachineBasicBlock. It also allows for constant time splicing of
MachineInstrs into or out of MachineBasicBlocks.
llvm-svn: 11340
2004-02-12 02:27:10 +00:00
5dd5be3ec3
Do not use MachineOperand::isVirtualRegister either!
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llvm-svn: 11283
2004-02-10 21:12:22 +00:00
a97abeb342
Change live interval representation. Machine instructions now have two
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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
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
a3a56fa041
Change string for joined intervals.
...
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
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
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
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
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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
19638ab2bd
Revert previous change. The code was correct...
...
llvm-svn: 10957
2004-01-22 19:17:52 +00:00
0aa9d0278d
Fix incorrect negatives in LiveIntervals::Interval::liveAt().
...
llvm-svn: 10956
2004-01-22 18:33:50 +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
0431621429
Fix miscomputation of live intervals. The catch is that registers can
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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
ebbd66c042
Correctly compute live variable information for physical registers
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when an implicitely defined register is later used by an alias. For example:
call foo
%reg1024 = mov %AL
The call implicitely defines EAX but only AL is used. Before this fix
no information was available on AL. Now EAX and all its aliases except
AL get defined and die at the call instruction whereas AL lives to be
killed by the assignment.
llvm-svn: 10813
2004-01-13 06:24:30 +00:00
1e01557c4e
Change implementation of LiveIntervals::overlap(). This results in a
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30-50% decrease in running time of the linear scan register allocator.
llvm-svn: 10707
2004-01-07 01:45:58 +00:00
2fa1aef707
Remove simple coalescing.
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llvm-svn: 10695
2004-01-05 08:24:57 +00:00
43b587d94d
Add coalescing to register allocator. A hint is added to each interval
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which denotes the register we would like to be assigned to (virtual or
physical). In register allocation, if this hint exists and we can map
it to a physical register (it is either a physical register or it is a
virtual register that already got assigned to a physical one) we use
that register if it is available instead of a random one in the free
pool.
llvm-svn: 10634
2003-12-28 17:58:18 +00:00
eeea81483f
Do a separate pass to compute spill weights because doing it inline
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with live intervals was missing registers that were used before they
were defined (in the arbitrary order live intervals numbers
instructions).
llvm-svn: 10603
2003-12-24 15:44:53 +00:00
3ec903474f
Fix crash when compiling twolf.
...
llvm-svn: 10584
2003-12-22 13:54:29 +00:00
2665d9c6f9
Change weight into a float so that we can take into account the
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nesting level when computing it. Right now the allocator uses:
w = sum_over_defs_uses( 10 ^ nesting level );
llvm-svn: 10569
2003-12-21 20:19:10 +00:00
c09b77ea35
Add support for inactive intervals. This effectively reuses registers
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for live ranges that fall into assigned registers' holes.
llvm-svn: 10566
2003-12-21 05:43:40 +00:00
7139090fd2
Remove TwoAddressInstruction from the public headers and add an ID
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instead, since this pass doesn't expose any state to its users.
llvm-svn: 10520
2003-12-18 22:40:24 +00:00
e5e2bd6777
Modify linear scan register allocator to use the two-address
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instruction pass. This also fixes all remaining bugs for this new
allocator to pass all tests under test/Programs.
llvm-svn: 10515
2003-12-18 13:15:02 +00:00
15b8036b29
When a variable is killed and redifined in a basic block only one
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killing instruction is tracked. This causes the LiveIntervals to
create bogus intervals. The workaound is to add a range to the
interval from the redefinition to the end of the basic block.
llvm-svn: 10510
2003-12-18 08:53:43 +00:00
40874c708f
Handle multiple virtual register definitions gracefully.
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Move some of the longer LiveIntervals::Interval method out of the
header and add debug information to them. Fix bug and simplify range
merging code.
llvm-svn: 10509
2003-12-18 08:48:48 +00:00
8870674da7
Change preserve all claim to just preserve live variables and phielimination.
...
llvm-svn: 10469
2003-12-15 04:55:38 +00:00
aaba4639f8
Change interface of MachineOperand as follows:
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a) remove opIsUse(), opIsDefOnly(), opIsDefAndUse()
b) add isUse(), isDef()
c) rename opHiBits32() to isHiBits32(),
opLoBits32() to isLoBits32(),
opHiBits64() to isHiBits64(),
opLoBits64() to isLoBits64().
This results to much more readable code, for example compare
"op.opIsDef() || op.opIsDefAndUse()" to "op.isDef()" a pattern used
very often in the code.
llvm-svn: 10461
2003-12-14 13:24:17 +00:00
7dbdf3839c
Ignore non-allocatable physical registers in live interval analysis.
...
llvm-svn: 10449
2003-12-13 11:11:02 +00:00
06f379a278
Handle explicit physical register defs.
...
llvm-svn: 10445
2003-12-13 05:26:39 +00:00
2de099e54f
Move operator<<(std::ostream&, const LiveInterval&) out of the header file.
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llvm-svn: 10290
2003-12-05 10:38:28 +00:00
ed28ca93ef
Sort live intervals by increasing start point.
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llvm-svn: 10289
2003-12-05 10:32:01 +00:00
0e9ded74c0
Merging the linear scan register allocator in trunk. It currently passes most tests under test/Programs/SingleSource/Benchmarks/Shootout so development will continue on trunk. The allocator is not enabled by default. You will need to pass -regallo=linearscan to lli or llc to use it.
...
llvm-svn: 10103
2003-11-20 03:32:25 +00:00
Chris Lattner