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203 Commits

Author SHA1 Message Date
Evan Cheng
97ada80b22 Some clean up. 
llvm-svn: 43043
 2007-10-16 21:09:14 +00:00
Evan Cheng
8af3000e93 Some clean up. 
llvm-svn: 42898
 2007-10-12 08:45:27 +00:00
David Greene
2ca4b270db Pluggable coalescers inplementation. 
llvm-svn: 41743
 2007-09-06 16:18:45 +00:00
Evan Cheng
215f802b75 Re-implement trivial rematerialization. This allows def MIs whose live intervals that are coalesced to be rematerialized. 
llvm-svn: 41060
 2007-08-13 23:45:17 +00:00
David Greene
6b14050d1e Factor live variable analysis so it does not do register coalescing 
simultaneously.  Move that pass to SimpleRegisterCoalescing.

This makes it easier to implement alternative register allocation and
coalescing strategies while maintaining reuse of the existing live
interval analysis.

llvm-svn: 37520
 2007-06-08 17:18:56 +00:00
Bill Wendling
a5f8cb0805 Change names from RA to something unique to get rid of naming conflicts with 
certain linkers...

llvm-svn: 36944
 2007-05-08 19:02:46 +00:00
Devang Patel
cd45427a87 Drop 'const' 
llvm-svn: 36662
 2007-05-03 01:11:54 +00:00
Devang Patel
8ee9065162 Use 'static const char' instead of 'static const int'. 
Due to darwin gcc bug, one version of darwin linker coalesces
static const int, which defauts PassID based pass identification.

llvm-svn: 36652
 2007-05-02 21:39:20 +00:00
Devang Patel
38a66bc82e Do not use typeinfo to identify pass in pass manager. 
llvm-svn: 36632
 2007-05-01 21:15:47 +00:00
Evan Cheng
7f44e880dc Match MachineFunction::UsedPhysRegs changes. 
llvm-svn: 36452
 2007-04-25 22:13:27 +00:00
Evan Cheng
4f48ec6738 Clean up. 
llvm-svn: 36431
 2007-04-25 07:18:20 +00:00
Evan Cheng
48352d7a71 Copy coalescing change to prevent a physical register from being pin to a 
long live interval that has low usage density.
1. Change order of coalescing to join physical registers with virtual
   registers first before virtual register intervals become too long.
2. Check size and usage density to determine if it's worthwhile to join.
3. If joining is aborted, assign virtual register live interval allocation
   preference field to the physical register.
4. Register allocator should try to allocate to the preferred register
   first (if available) to create identify moves that can be eliminated.

llvm-svn: 36218
 2007-04-17 20:32:26 +00:00
Evan Cheng
0176b9859d First cut trivial re-materialization support. 
llvm-svn: 35208
 2007-03-20 08:13:50 +00:00
Evan Cheng
9968353d64 Only add liveinterval to livein set if it isn't assigned a stack slot. 
llvm-svn: 34593
 2007-02-25 09:39:02 +00:00
Evan Cheng
e4ab9c032b Re-apply my liveintervalanalysis changes. Now with PR1207 fixes. 
llvm-svn: 34428
 2007-02-19 21:49:54 +00:00
Reid Spencer
b27fcf3482 For PR1207: 
Revert patches that caused the problem. Evan, please investigate and reapply
when you've discovered the problem.

llvm-svn: 34399
 2007-02-19 03:20:00 +00:00
Evan Cheng
259a05c582 Do not add livein's to entry MBB twice. 
llvm-svn: 34382
 2007-02-17 11:11:27 +00:00
Evan Cheng
64185104f1 Add live-ins to every BB. 
llvm-svn: 34342
 2007-02-16 09:05:02 +00:00
Chris Lattner
a975b95adb Eliminate static ctors from Statistics 
llvm-svn: 32698
 2006-12-19 22:41:21 +00:00
Chris Lattner
a531ce882e Detemplatize the Statistic class. The only type it is instantiated with 
is 'unsigned'.

llvm-svn: 32279
 2006-12-06 17:46:33 +00:00
Chris Lattner
a7baddddcc eliminate fp statistic 
llvm-svn: 32251
 2006-12-06 01:48:55 +00:00
Jeff Cohen
f99052befb Unbreak VC++ build. 
llvm-svn: 32113
 2006-12-02 02:22:01 +00:00
Bill Wendling
0ae0a45ebe Replace std::cerr uses of the "DEBUG" macro with "DOUT" instead. Removes 
a #include of iostream.

llvm-svn: 31800
 2006-11-17 00:50:36 +00:00
Jim Laskey
28fec74f1b Remove redundant <cmath>. 
llvm-svn: 31561
 2006-11-08 19:16:44 +00:00
Jim Laskey
4b1aff4aec Use correct value for float HUGH_VAL. 
llvm-svn: 31500
 2006-11-07 12:25:45 +00:00
Jim Laskey
47b2dcf17f LinearScanner hotspot. 
llvm-svn: 31153
 2006-10-24 14:35:25 +00:00
Chris Lattner
33bd5dcfb7 s|llvm/Support/Visibility.h|llvm/Support/Compiler.h| 
llvm-svn: 29911
 2006-08-27 12:54:02 +00:00
Jim Laskey
6d121090d3 Final polish on machine pass registries. 
llvm-svn: 29471
 2006-08-02 12:30:23 +00:00
Jim Laskey
b92b14f422 Introducing plugable register allocators and instruction schedulers. 
llvm-svn: 29434
 2006-08-01 14:21:23 +00:00
Andrew Lenharth
c1074954fb Reduce number of exported symbols 
llvm-svn: 29220
 2006-07-20 17:28:38 +00:00
Chris Lattner
de706b3e3e Shave another 27K off libllvmgcc.dylib with visibility hidden 
llvm-svn: 28973
 2006-06-28 22:17:39 +00:00
Evan Cheng
772647518f If the register allocator cannot find a register to spill, try the aliases. If 
that still fails (because all the register spill weights are inf), just grab
one.

llvm-svn: 28262
 2006-05-12 19:07:46 +00:00
Evan Cheng
da04c3aab4 Backing out previous check-in. 
llvm-svn: 28219
 2006-05-11 07:28:16 +00:00
Evan Cheng
03fa9eb65e If the live interval legnth is essentially zero, i.e. in every live range 
the use follows def immediately, it doesn't make sense to spill it and
hope it will be easier to allocate for this LI.

llvm-svn: 28217
 2006-05-10 22:30:41 +00:00
Chris Lattner
8b6f0daaae Add some comments. 
llvm-svn: 27133
 2006-03-25 23:00:56 +00:00
Chris Lattner
b74e255d8b Code cleanups, no functionality change 
llvm-svn: 26328
 2006-02-23 06:44:17 +00:00
Chris Lattner
aafc339b4e Add explicit #includes of <iostream> 
llvm-svn: 25515
 2006-01-22 23:41:00 +00:00
Duraid Madina
f8a342aa4f HB is *the* code janitor. 
llvm-svn: 25031
 2005-12-28 04:55:42 +00:00
Duraid Madina
04be8e167c I think I know what you meant here, but just to be safe I'll let you 
do it. :)

    <_sabre_> excuses excuses

llvm-svn: 24471
 2005-11-21 14:09:40 +00:00
Chris Lattner
f78eca1416 Add section switching to common code generator code. Add a couple of 
asserts.

llvm-svn: 24445
 2005-11-21 07:06:27 +00:00
Chris Lattner
288e5b0a7d Expose the LiveInterval interfaces as public headers. 
llvm-svn: 23400
 2005-09-21 04:19:09 +00:00
Chris Lattner
36461b2e37 When checking the fixed intervals, don't forget to check for register aliases. 
This fixes PR621 and Regression/CodeGen/X86/2005-08-30-RegAllocAliasProblem.ll

llvm-svn: 23158
 2005-08-30 21:03:36 +00:00
Chris Lattner
610eeca969 Keep track of which registers are related to which other registers. 
Use this information to avoid doing expensive interval intersections for
registers that could not possible be interesting.  This speeds up linscan
on ia64 compiling kc++ in release mode from taking 7.82s to 4.8s(!), total
itanium llc time on this program is 27.3s now.  This marginally speeds up
PPC and X86, but they appear to be limited by other parts of linscan, not
this code.

On this program, on itanium, live intervals now takes 41% of llc time.

llvm-svn: 22986
 2005-08-23 22:27:31 +00:00
Chris Lattner
2c5f36d938 Try to avoid scanning the fixed list. On architectures with a non-stupid 
number of regs (e.g. most riscs), many functions won't need to use callee
clobbered registers.  Do a speculative check to see if we can get a free
register without processing the fixed list (which has all of these).  This
saves a lot of time on machines with lots of callee clobbered regs (e.g.
ppc and itanium, also x86).

This reduces ppc llc compile time from 184s -> 172s on kc++.  This is probably
worth FAR FAR more on itanium though.

llvm-svn: 22972
 2005-08-22 20:59:30 +00:00
Chris Lattner
9b0058b424 Move some code in the register assignment case that only needs to happen if 
we spill out of the fast path.  The scan of active_ and the calls to
updateSpillWeights don't need to happen unless a spill occurs.  This reduces
debug llc time of kc++ with ppc from 187.3s to 183.2s.

llvm-svn: 22971
 2005-08-22 20:20:42 +00:00
Chris Lattner
a9710ba54f Speed up this loop a bit, based on some observations that Nate made, and 
add some comments.  This loop really needs to be reevaluated!

llvm-svn: 22966
 2005-08-22 16:55:22 +00:00
Misha Brukman
774e55c446 Remove trailing whitespace 
llvm-svn: 21420
 2005-04-21 22:36:52 +00:00
Chris Lattner
964297fc32 Update these register allocators to set the PhysRegUsed info in MachineFunction. 
llvm-svn: 19791
 2005-01-23 22:45:13 +00:00
Chris Lattner
104064bf2c Silence VS warnings 
llvm-svn: 19385
 2005-01-08 19:53:50 +00:00
Chris Lattner
558a640b3c Move virtual method call out of loop 
llvm-svn: 18955
 2004-12-15 07:04:32 +00:00
Nate Begeman
85a2e38a56 Move virtual function call out of loop to speed up getFreePhysReg by about 
20%, shaving 0.1s off hbd compile time on my g5.  Yay.

llvm-svn: 18592
 2004-12-07 05:25:53 +00:00
Chris Lattner
ccd7bfb561 * There is no reason for SpillWeights to be an instance var 
* Do not put fixed registers into the unhandled set.  This means they will
  never find their way into the inactive, active, or handled sets, so we
  can simplify a bunch of code.

llvm-svn: 17945
 2004-11-18 06:01:45 +00:00
Chris Lattner
e9ab36314d Fix a couple of bugs where we considered physregs past their range as possibly 
intersecting an interval.

llvm-svn: 17939
 2004-11-18 04:33:31 +00:00
Chris Lattner
3a6991f745 Start using the iterators in the fixed_ intervals to avoid having to binary 
search physreg intervals every time we access it.  This takes another
half second off of linscan.

llvm-svn: 17937
 2004-11-18 04:13:02 +00:00
Chris Lattner
a52650a18a Add a counter for the number of times linscan has to backtrack. Start using 
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
 2004-11-18 03:49:30 +00:00
Chris Lattner
18ced80110 * Improve comments/documentation substantially 
* 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
 2004-11-18 02:42:27 +00:00
Chris Lattner
ddc898639f Rename some methods, use 'begin' instead of 'start', add new LiveInterval 
iterator/begin/end members.

llvm-svn: 17930
 2004-11-18 01:29:39 +00:00
Chris Lattner
bde92f3c03 Do not make i have bigger scope that we need 
llvm-svn: 17483
 2004-11-05 04:47:37 +00:00
Chris Lattner
962d398430 Free the VirtRegMap at the end of MachineFunction processing instead of at 
the beginning of processing the next one.

llvm-svn: 16605
 2004-09-30 02:02:33 +00:00
Alkis Evlogimenos
0c50e0f211 Fixes to make LLVM compile with vc7.1. 
Patch contributed by Paolo Invernizzi!

llvm-svn: 16152
 2004-09-03 18:19:51 +00:00
Alkis Evlogimenos
999a10318f Change the way we choose a free register: instead of picking the first 
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
 2004-09-02 21:23:32 +00:00
Alkis Evlogimenos
7a287da6cd We don't need to sort the added vector as unhandled intervals are 
stored in a binary heap.

llvm-svn: 16143
 2004-09-02 18:00:38 +00:00
Reid Spencer
c4abcbefb1 Changes For Bug 352 
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
 2004-09-01 22:55:40 +00:00
Alkis Evlogimenos
e7e63c8da4 Be a bit more efficient when processing the active and inactive 
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
 2004-09-01 22:52:29 +00:00
Alkis Evlogimenos
8ae92113d6 Now that LiveIntervals::addIntervalsForSpills is fixed, do not require 
LiveVariables.

llvm-svn: 16076
 2004-08-27 19:00:29 +00:00
Alkis Evlogimenos
7c06c0aeee Back out this change as it broke the build last night. This should be 
investicated further as the linearscan variants don't really need
LiveVariables...

llvm-svn: 16074
 2004-08-27 18:01:21 +00:00
Alkis Evlogimenos
f18ee1fc99 The linear scan variants do not require the LiveVariables analysis. 
llvm-svn: 16071
 2004-08-27 04:51:13 +00:00
Alkis Evlogimenos
db3b503b6f Convert indentation to 2 spaces. 
llvm-svn: 15489
 2004-08-04 09:46:26 +00:00
Alkis Evlogimenos
3e3fe9ff5a Add some comments to the backtracking code. 
llvm-svn: 15200
 2004-07-25 08:10:33 +00:00
Alkis Evlogimenos
0618429149 Change std::map<unsigned, LiveInterval*> into a std::map<unsigned, 
LiveInterval>. This saves some space and removes the pointer
indirection caused by following the pointer.

llvm-svn: 15167
 2004-07-24 11:44:15 +00:00
Chris Lattner
c71a9684f8 Completely eliminate the intervals_ list. instead, the r2iMap_ maintains 
ownership of the intervals.

llvm-svn: 15155
 2004-07-24 03:32:06 +00:00
Chris Lattner
a1bce98d7f Rename LiveIntervals.(cpp|h) -> LiveIntervalAnalysis.(cpp|h) 
llvm-svn: 15135
 2004-07-23 17:56:30 +00:00
Alkis Evlogimenos
0292045897 Some compile time improvements resulting in a 1sec speedup in the 5sec 
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
 2004-07-22 08:14:44 +00:00
Brian Gaeke
f18cdca667 These files don't need to include <iostream> since they include "Support/Debug.h". 
llvm-svn: 15089
 2004-07-21 20:50:33 +00:00
Alkis Evlogimenos
25fb592aa6 Remove dead code. 
llvm-svn: 15011
 2004-07-19 23:35:55 +00:00
Chris Lattner
f5bdaf62f8 Fix assertion to not dereference end! 
llvm-svn: 14991
 2004-07-19 05:02:09 +00:00
Chris Lattner
42b44d3d1c Add some asserts that the list of intervals returned by addIntervalsForSpills 
is sorted.  This is not the case currently, which is causing no end of
problems.

llvm-svn: 14990
 2004-07-19 04:47:36 +00:00
Alkis Evlogimenos
69ea68d4b6 Correctly compute the ration of iterations/#intervals. 
llvm-svn: 14626
 2004-07-04 17:23:35 +00:00
Alkis Evlogimenos
8ff35c1ce8 Add efficiency statistic. 
llvm-svn: 14590
 2004-07-04 07:59:06 +00:00
Chris Lattner
6be1c456a8 Rename Interval class to LiveInterval to avoid conflicting with the already 
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
Alkis Evlogimenos
f410424283 Pull Interval class out of LiveIntervals. 
llvm-svn: 13910
 2004-05-30 07:46:27 +00:00
Alkis Evlogimenos
2598a63586 When spilling an register, introduce a new temporary for each of its 
spills. This allows for more flexibility when allocating registers for
spill code.

llvm-svn: 13907
 2004-05-30 07:24:39 +00:00
Alkis Evlogimenos
76be543a64 Add required header 
llvm-svn: 13417
 2004-05-08 03:50:03 +00:00
Chris Lattner
5f18bec9e6 numeric_limits::infinity() apparently does not work on all systems. As a 
workaround, use the C HUGE_VAL macro instead.

llvm-svn: 13377
 2004-05-06 16:25:59 +00:00
Alkis Evlogimenos
81c6957eab Make the set of fixed (preallocated) intervals be a fixed superset of 
unhandled + handled. So unhandled is now including all fixed intervals
and fixed intervals never changes when processing a function.

llvm-svn: 12462
 2004-03-17 00:48:59 +00:00
Alkis Evlogimenos
c4ad8080f7 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
 2004-03-01 23:18:15 +00:00
Alkis Evlogimenos
64e76a0d43 Add the long awaited memory operand folding support for linear scan 
llvm-svn: 12058
 2004-03-01 20:05:10 +00:00
Alkis Evlogimenos
ddfd27ff97 Rename member function to be consistent with the rest. 
llvm-svn: 11898
 2004-02-27 06:11:15 +00:00
Alkis Evlogimenos
2caa729f02 Remove asssert since it is breaking cases that it shouldn't. 
llvm-svn: 11841
 2004-02-25 22:01:06 +00:00
Chris Lattner
ccae3f6d60 Add an assertion 
llvm-svn: 11830
 2004-02-25 19:37:44 +00:00
Alkis Evlogimenos
6d7150e9bb Move machine code rewriter and spiller outside the register 
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
 2004-02-24 08:58:30 +00:00
Alkis Evlogimenos
9344a740be Remove '4Virt' from member function names as it is obvious. 
llvm-svn: 11781
 2004-02-23 23:47:10 +00:00
Alkis Evlogimenos
d192266264 Refactor VirtRegMap out of RegAllocLinearScan as the first part of bug 
251 (providing a generic machine code rewriter/spiller).

llvm-svn: 11780
 2004-02-23 23:08:11 +00:00
Alkis Evlogimenos
34f28e5d3f Add number of spilled registers statistic. 
llvm-svn: 11759
 2004-02-23 18:45:32 +00:00
Alkis Evlogimenos
2863fbd178 Remove implementation of default constructor as it is useless now. 
llvm-svn: 11755
 2004-02-23 18:28:35 +00:00
Alkis Evlogimenos
50598d1135 Improved PhysRegTracker interface. RegAlloc lazily allocates the register tracker using a std::auto_ptr 
llvm-svn: 11738
 2004-02-23 06:10:13 +00:00
Alkis Evlogimenos
1525e120a6 Fix comments in PhysRegTracker and rename isPhysRegAvail to isRegAvail to be consistent with the other two 
llvm-svn: 11723
 2004-02-23 01:25:05 +00:00
Alkis Evlogimenos
ba2b9aec71 Pull PhysRegTracker out of RegAllocLinearScan as it can be used by other allocators as well 
llvm-svn: 11720
 2004-02-23 00:53:31 +00:00
Alkis Evlogimenos
850bd0819f Move LiveIntervals.h to lib/CodeGen since it shouldn't be exposed to other parts of the compiler 
llvm-svn: 11719
 2004-02-23 00:50:15 +00:00
Alkis Evlogimenos
ba33a0ab9b Print basic block boundaries in machine instruction debug output. 
llvm-svn: 11704
 2004-02-22 05:46:04 +00:00