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86 Commits

Author SHA1 Message Date
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
Alkis Evlogimenos
168e4bf455 Fix crash in debug output. 
llvm-svn: 11659
 2004-02-20 06:41:12 +00:00
Alkis Evlogimenos
16744f2860 Fix instruction numbering in debug output. 
llvm-svn: 11655
 2004-02-20 06:29:51 +00:00
Alkis Evlogimenos
f32239a5c6 Too many changes in one commit: 
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
Alkis Evlogimenos
eed4727191 Fix RA::verifyAssignment() 
llvm-svn: 11629
 2004-02-19 19:24:17 +00:00
Alkis Evlogimenos
68f40cbfd3 Rename reloads/spills to loads/stores. 
llvm-svn: 11619
 2004-02-19 06:19:09 +00:00
Alkis Evlogimenos
310f641c9c Implement assignment correctness verification. 
llvm-svn: 11609
 2004-02-18 23:15:23 +00:00
Alkis Evlogimenos
1026a01d5a Eliminate the use of spill (reserved) registers. 
llvm-svn: 11476
 2004-02-15 10:24:21 +00:00
Alkis Evlogimenos
3eeb600093 Use std::numeric_limits<float>::infinity() instead of 
std::numeric_limits<float>::max() for weighting preallocated
intervals.

llvm-svn: 11427
 2004-02-14 00:44:07 +00:00
Alkis Evlogimenos
6d6ab846af Remove getAllocatedRegNum(). Use getReg() instead. 
llvm-svn: 11393
 2004-02-13 21:01:20 +00:00
Alkis Evlogimenos
b755d35fd2 Change MachineBasicBlock's vector of MachineInstr pointers into an 
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
Chris Lattner
37e040ee03 Do not use MachineOperand::isVirtualRegister either! 
llvm-svn: 11283
 2004-02-10 21:12:22 +00:00
Alkis Evlogimenos
59bb9d69c7 Increase code clarity. 
llvm-svn: 11151
 2004-02-06 18:08:18 +00:00
Alkis Evlogimenos
2aa7703205 Eliminate uneeded lookups by passing a Virt2PhysMap::iterator instead 
of the virtual register to certain functions.

llvm-svn: 11143
 2004-02-06 03:15:40 +00:00
Alkis Evlogimenos
676e5b8997 Modify the two address instruction pass to remove the duplicate 
operand of the instruction and thus simplify the register allocation.

llvm-svn: 11124
 2004-02-04 22:17:40 +00:00
Alkis Evlogimenos
5e78d4bd75 When an instruction like: A += B had both A and B virtual registers 
spilled, A was loaded from its stack location twice. This fixes the bug.

llvm-svn: 11093
 2004-02-03 01:13:07 +00:00
Alkis Evlogimenos
a4fab12df8 Fix debugging output. 
llvm-svn: 11088
 2004-02-02 22:00:32 +00:00
Alkis Evlogimenos
1825f30a3a Create an object for tracking physical register usage. This will look 
much better when I get rid of the reserved registers.

llvm-svn: 11066
 2004-02-02 07:30:36 +00:00