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96 Commits

Author SHA1 Message Date
Chris Lattner
f3ebc3f3d2 Remove attribution from file headers, per discussion on llvmdev. 
llvm-svn: 45418
 2007-12-29 20:36:04 +00:00
Evan Cheng
8e22379303 Live interval splitting: 
When a live interval is being spilled, rather than creating short, non-spillable
intervals for every def / use, split the interval at BB boundaries. That is, for
every BB where the live interval is defined or used, create a new interval that
covers all the defs and uses in the BB.

This is designed to eliminate one common problem: multiple reloads of the same
value in a single basic block. Note, it does *not* decrease the number of spills
since no copies are inserted so the split intervals are *connected* through
spill and reloads (or rematerialization). The newly created intervals can be
spilled again, in that case, since it does not span multiple basic blocks, it's
spilled in the usual manner. However, it can reuse the same stack slot as the
previously split interval.

This is currently controlled by -split-intervals-at-bb.

llvm-svn: 44198
 2007-11-17 00:40:40 +00:00
Owen Anderson
9d86ef12c8 Bring UsedBlocks back. StrongPHIElimination needs this information. 
llvm-svn: 43866
 2007-11-08 01:20:48 +00:00
Evan Cheng
a406b47f14 Handle cases where a register and one of its super-register are both marked as 
defined on the same instruction. This fixes PR1767.

llvm-svn: 43699
 2007-11-05 03:11:55 +00:00
Dan Gohman
9da02f5ee2 Remove isReg, isImm, and isMBB, and change all their users to use 
isRegister, isImmediate, and isMachineBasicBlock, which are equivalent,
and more popular.

llvm-svn: 41958
 2007-09-14 20:33:02 +00:00
Evan Cheng
d8317967aa Fixed a typo that's causing a missing kill marker. 
llvm-svn: 41893
 2007-09-12 23:02:04 +00:00
Evan Cheng
c16847b157 Sometimes a MI can define a register as well as defining a super-register at the 
same time. Do not mark the "smaller" def as dead.

llvm-svn: 41871
 2007-09-11 22:34:47 +00:00
Evan Cheng
d8ded48468 Bugs: missing partial uses and redundant partial defs. 
llvm-svn: 40688
 2007-08-01 20:18:21 +00:00
Dan Gohman
147d9fa57d Don't assume that only Uses can be kills. Defs are marked as kills initially 
when there are no uses. This fixes a dangling-pointer bug, where pointers to
deleted instructions were not removed from kills lists. More info here:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2007-July/009749.html

llvm-svn: 40131
 2007-07-20 23:17:34 +00:00
Evan Cheng
f9ef70560e Dead code. 
llvm-svn: 39979
 2007-07-17 20:01:19 +00:00
Evan Cheng
e66f822ecc Replace std::set with SmallPtrSet. 
llvm-svn: 37746
 2007-06-27 05:23:00 +00:00
Evan Cheng
d8417d9199 Properly handle kills of a physical register which has sub-registers that are read by later instructions. 
llvm-svn: 37739
 2007-06-26 21:03:35 +00:00
Evan Cheng
fc2377d4ed When marking a register as being implicitly defined, make sure to clear its partial use info as well. 
llvm-svn: 37046
 2007-05-14 20:39:18 +00:00
Evan Cheng
9e17872c1d Eliminate MarkVirtRegAliveInBlock recursion. 
llvm-svn: 36943
 2007-05-08 19:00:00 +00:00
Devang Patel
8c78a0bff0 Drop 'const' 
llvm-svn: 36662
 2007-05-03 01:11:54 +00:00
Devang Patel
e95c6ad802 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
09f162ca6a Do not use typeinfo to identify pass in pass manager. 
llvm-svn: 36632
 2007-05-01 21:15:47 +00:00
Evan Cheng
910c80851e Rename findRegisterUseOperand to findRegisterUseOperandIdx to avoid confusion. 
llvm-svn: 36483
 2007-04-26 19:00:32 +00:00
Evan Cheng
ed23a1387e Minor bug. 
llvm-svn: 36473
 2007-04-26 08:24:22 +00:00
Evan Cheng
43a17fe826 Be careful when to add implicit kill / dead operands. Don't add them during / post reg-allocation. 
llvm-svn: 36458
 2007-04-26 01:40:09 +00:00
Evan Cheng
d4549c5527 Clean up. 
llvm-svn: 36449
 2007-04-25 21:34:08 +00:00
Evan Cheng
0fbe14ab87 Data structure change to improve compile time (especially in debug mode). 
llvm-svn: 36447
 2007-04-25 19:34:00 +00:00
Evan Cheng
7818c03c6b Fix for PR1306. 
- A register def / use now implicitly affects sub-register liveness but does
not affect liveness information of super-registers.
- Def of a larger register (if followed by a use later) is treated as
read/mod/write of a smaller register.

llvm-svn: 36434
 2007-04-25 07:30:23 +00:00
Evan Cheng
4c53d321aa VarInfo::UsedBlocks is no longer used. Remove. 
llvm-svn: 36250
 2007-04-18 05:04:38 +00:00
Evan Cheng
8387cf1100 Keep track of number of uses within the function per virtual register. 
llvm-svn: 36214
 2007-04-17 20:22:11 +00:00
Evan Cheng
f6f043332f Track the BB's where each virtual register is used. 
llvm-svn: 35135
 2007-03-17 09:29:54 +00:00
Evan Cheng
df7949a8d0 If a virtual register is already marked alive in this block, that means it is 
alive in one of the successor block. Do not add it to the kill list.

llvm-svn: 35041
 2007-03-09 09:48:56 +00:00
Evan Cheng
91b0790297 Avoid variable shadowing. 
llvm-svn: 35039
 2007-03-09 06:02:17 +00:00
Evan Cheng
f7ed82da10 Re-apply my liveintervalanalysis changes. Now with PR1207 fixes. 
llvm-svn: 34428
 2007-02-19 21:49:54 +00:00
Reid Spencer
da81bf4d3e 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
ef932b067d - Use MRegister::regsOverlap(). 
- Allow LiveVariables to track liveness of more registers.

llvm-svn: 34379
 2007-02-17 11:09:47 +00:00
Evan Cheng
b612316f20 Allow any MachineBasicBlock (not just the entry block) to have live-in physical 
registers. Make sure liveinterval analysis is correctly creating live ranges
for them.

llvm-svn: 34217
 2007-02-13 01:30:55 +00:00
Bill Wendling
355fc5ad50 Removed more <iostream> includes 
llvm-svn: 32321
 2006-12-07 20:28:15 +00:00
Evan Cheng
70ec52896e Do away with kill / dead maps. Move kill / dead info onto MI's. 
llvm-svn: 31759
 2006-11-15 20:51:59 +00:00
Evan Cheng
8c9c6d71ed Add implicit def / use operands to MachineInstr. 
llvm-svn: 31633
 2006-11-10 08:43:01 +00:00
Reid Spencer
de46e48420 For PR786: 
Turn on -Wunused and -Wno-unused-parameter. Clean up most of the resulting
fall out by removing unused variables. Remaining warnings have to do with
unused functions (I didn't want to delete code without review) and unused
variables in generated code. Maintainers should clean up the remaining
issues when they see them. All changes pass DejaGnu tests and Olden.

llvm-svn: 31380
 2006-11-02 20:25:50 +00:00
Bill Wendling
984f0ce06b Fix for PR929. The PHI nodes were being gone through for each instruction 
in a successor block for every block...resulting in some O(N^k) algorithm
which wasn't very good for performance. Calculating this information up
front and keeping it in a map made it much faster.

llvm-svn: 30697
 2006-10-03 07:20:20 +00:00
Chris Lattner
2cb238320d Only call isUse/isDef on register operands 
llvm-svn: 30118
 2006-09-05 20:19:27 +00:00
Chris Lattner
f8f724a2b1 Move two methods out of line, make them work when the record for a machine 
instruction includes physregs.

llvm-svn: 30061
 2006-09-03 00:05:09 +00:00
Chris Lattner
3c9b2420df Eliminate RegisterAnalysis. RegisterPass now does all that is necessary. 
llvm-svn: 29921
 2006-08-27 22:30:17 +00:00
Jim Laskey
4b49c23571 Eliminate data relocations by using NULL instead of global empty list. 
llvm-svn: 29250
 2006-07-21 21:15:20 +00:00
Chris Lattner
ee64b6b40f Remove a bunch more dead V9 specific stuff 
llvm-svn: 28094
 2006-05-04 01:26:39 +00:00
Chris Lattner
be45b5e948 Add a LiveVariables::VarInfo::dump method 
llvm-svn: 25080
 2006-01-04 05:40:30 +00:00
Chris Lattner
2ea5c99eca 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
eeacce5a60 Implement LiveVariables.h change 
llvm-svn: 22994
 2005-08-24 00:09:33 +00:00
Chris Lattner
469652752c adjust to new live variables interface 
llvm-svn: 22992
 2005-08-23 23:42:17 +00:00
Chris Lattner
91caf1d039 allow a virtual register to be associated with live-in values. 
llvm-svn: 21927
 2005-05-13 07:08:07 +00:00
Misha Brukman
835702a094 Remove trailing whitespace 
llvm-svn: 21420
 2005-04-21 22:36:52 +00:00
Chris Lattner
4c6ab01a20 Consider the livein/out set for a function, allowing targets to not have to 
use ugly imp_def/imp_uses for arguments and return values.

llvm-svn: 21180
 2005-04-09 15:23:25 +00:00
Chris Lattner
1cffa73f2a Just in case, handle something that is both a use and a def. 
llvm-svn: 19696
 2005-01-19 17:11:51 +00:00