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582 Commits

Author SHA1 Message Date
Chris Lattner
8fb3d445f5 Keep track of the start of MBB's in a separate map from instructions. This 
is faster and is needed for future improvements.

llvm-svn: 30383
 2006-09-15 03:57:23 +00:00
Chris Lattner
13a5dcddce Fix a long-standing wart in the code generator: two-address instruction lowering 
actually *removes* one of the operands, instead of just assigning both operands
the same register.  This make reasoning about instructions unnecessarily complex,
because you need to know if you are before or after register allocation to match
up operand #'s with the target description file.

Changing this also gets rid of a bunch of hacky code in various places.

This patch also includes changes to fold loads into cmp/test instructions in
the X86 backend, along with a significant simplification to the X86 spill
folding code.

llvm-svn: 30108
 2006-09-05 02:12:02 +00:00
Chris Lattner
1eed04d1fb Correct fix for a crasher on functions with live in values 
llvm-svn: 30099
 2006-09-04 18:27:40 +00:00
Chris Lattner
bff0b5969f Hack around a regression I introduced yesterday 
llvm-svn: 30098
 2006-09-04 18:20:15 +00:00
Chris Lattner
8584e940b8 Avoid beating on the mi2i map when we know the answer already. 
llvm-svn: 30066
 2006-09-03 08:07:11 +00:00
Chris Lattner
774785a79d minor speedup 
llvm-svn: 30065
 2006-09-03 07:53:50 +00:00
Chris Lattner
75742e532a Iteration is required for some cases, even if they don't occur in crafty. 
Restore it, which re-fixes X86/2006-08-21-ExtraMovInst.ll

llvm-svn: 30050
 2006-09-02 05:32:53 +00:00
Chris Lattner
5a56d30906 When joining two intervals where the RHS is really simple, use a light-weight 
method for joining the live ranges instead of the fully-general one.

llvm-svn: 30049
 2006-09-02 05:26:59 +00:00
Chris Lattner
93c067dc2d Pull some code out of a hot recursive function because the common case doesn't 
need recursion.

llvm-svn: 30015
 2006-09-01 07:00:23 +00:00
Chris Lattner
3eac2c87aa Reserve space in the ValueNumberInfo vector. This speeds up live interval 
analysis 16% on crafty.

Wrap long lines.

llvm-svn: 30012
 2006-09-01 06:10:18 +00:00
Chris Lattner
f765351978 Iterative coallescing doesn't buy us anything (we get identical results on 
crafty with and without it).  Removing it speeds up live intervals 6%.

llvm-svn: 30010
 2006-09-01 04:02:42 +00:00
Chris Lattner
a700a19d04 Add a special case that speeds up coallescing a bit, but not enough. 
llvm-svn: 29996
 2006-08-31 06:48:26 +00:00
Chris Lattner
78cca7243c Delete copies as they are coallesced instead of waiting until the end. 
llvm-svn: 29995
 2006-08-31 05:58:59 +00:00
Chris Lattner
aa36808fd3 avoid calling the virtual isMoveInstr method endlessly by caching its results. 
llvm-svn: 29994
 2006-08-31 05:54:43 +00:00
Chris Lattner
cb74860cce Fix a compiler crash bootstrapping llvm-gcc. 
llvm-svn: 29989
 2006-08-30 23:02:29 +00:00
Chris Lattner
34434e97c9 Teach the coallescer to coallesce live intervals joined by an arbitrary 
number of copies, potentially defining live ranges that appear to have
differing value numbers that become identical when coallsced.  Among other
things, this fixes CodeGen/X86/shift-coalesce.ll and PR687.

llvm-svn: 29968
 2006-08-29 23:18:15 +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
Chris Lattner
2c3683a901 typo fix 
llvm-svn: 29910
 2006-08-27 12:47:48 +00:00
Chris Lattner
122f2bcdc2 Simplifications to liveinterval analysis, no functionality change. 
llvm-svn: 29896
 2006-08-26 01:28:16 +00:00
Chris Lattner
f4f0b1995c Completely change the way that joining with physregs is implemented. This 
paves the way for future changes, increases coallescing opportunities (in
theory, not witnessed in practice), and eliminates the really expensive
LiveIntervals::overlapsAliases method.

llvm-svn: 29890
 2006-08-25 23:41:24 +00:00
Chris Lattner
bdf121060c Take advantage of the recent improvements to the liveintervals set (tracking 
instructions which define each value#) to simplify and improve the coallescer.
In particular, this patch:

1. Implements iterative coallescing.
2. Reverts an unsafe hack from handlePhysRegDef, superceeding it with a
   better solution.
3. Implements PR865, "coallescing" away the second copy in code like:

   A = B
   ...
   B = A

This also includes changes to symbolically print registers in intervals
when possible.

llvm-svn: 29862
 2006-08-24 22:43:55 +00:00
Chris Lattner
2e9f1bc056 Improve the LiveInterval class to keep track of which machine instruction 
defines each value# tracked by the interval.  This will be used to improve
coallescing.

llvm-svn: 29830
 2006-08-22 18:19:46 +00:00
Chris Lattner
1d77a0ff88 Print physreg names symbolically in dumps 
llvm-svn: 29805
 2006-08-21 23:03:54 +00:00
Chris Lattner
213159a6ee Print debug info as: 
*** Register mapping ***
  reg 1024 -> %reg1028
  reg 1026 -> EAX
  reg 1027 -> %reg1028

instead of:

*** Register mapping ***
  reg 1024 -> reg 1028
  reg 1026 -> reg 15
  reg 1027 -> reg 1028

llvm-svn: 29803
 2006-08-21 22:56:29 +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
Andrew Lenharth
c496b418b5 Reduce number of exported symbols 
llvm-svn: 29220
 2006-07-20 17:28:38 +00:00
Chris Lattner
aa2372562e Patches to make the LLVM sources more -pedantic clean. Patch provided 
by Anton Korobeynikov!  This is a step towards closing PR786.

llvm-svn: 28447
 2006-05-24 17:04:05 +00:00
Evan Cheng
6a6886185b Backing out fix for PR770. Need to re-apply it after live range splitting is possible 
llvm-svn: 28236
 2006-05-12 06:06:34 +00:00
Evan Cheng
47926aff96 Set weight of zero length intervals to infinite to prevent them from being 
spilled.

llvm-svn: 28220
 2006-05-11 07:29:24 +00:00
Evan Cheng
ae45020720 PR 770 - permit coallescing of registers in subset register classes. 
llvm-svn: 28197
 2006-05-09 06:37:48 +00:00
Chris Lattner
10d6341618 Move some methods out of MachineInstr into MachineOperand 
llvm-svn: 28102
 2006-05-04 17:52:23 +00:00
Chris Lattner
4dee67c2cd Remove previous patch, which wasn't quite right. 
llvm-svn: 28039
 2006-05-01 21:16:03 +00:00
Evan Cheng
f71f0f2e0b Local spiller kills a store if the folded restore is turned into a copy. 
But this is incorrect if the spilled value live range extends beyond the
current BB.
It is currently controlled by a temporary option -spiller-check-liveout.

llvm-svn: 28024
 2006-04-30 08:41:47 +00:00
Chris Lattner
de02d7727f Add explicit #includes of <iostream> 
llvm-svn: 25515
 2006-01-22 23:41:00 +00:00
Chris Lattner
b05fce676f Minor cleanup, no functionality change for current targets 
llvm-svn: 25173
 2006-01-10 05:41:59 +00:00
Chris Lattner
b723c33614 Change a variable from being an iterator to a raw MachineInstr*, to make 
GDB use tolerable

llvm-svn: 25064
 2006-01-03 07:41:37 +00:00
Chris Lattner
3c7974aade Fix some spello's pointed out by Gabor Greif 
llvm-svn: 24019
 2005-10-26 18:41:41 +00:00
Chris Lattner
e95b5745c0 Make the coallescer a bit smarter, allowing it to join more live ranges. 
For example, we can now join things like [0-30:0)[31-40:1)[52-59:2)
with [40:60:0) if the 52-59 range is defined by a copy from the 40-60 range.
The resultant range ends up being [0-30:0)[31-60:1).

This fires a lot through-out the test suite (e.g. shrinking bc from
19492 -> 18509 machineinstrs) though most gains are smaller (e.g. about
50 copies eliminated from crafty).

llvm-svn: 23866
 2005-10-21 06:49:50 +00:00
Chris Lattner
b1f8982ff0 Expose the LiveInterval interfaces as public headers. 
llvm-svn: 23400
 2005-09-21 04:19:09 +00:00
Chris Lattner
ce3662f2a2 remove debugging code *slaps head* 
llvm-svn: 23294
 2005-09-09 19:19:20 +00:00
Chris Lattner
c9053083eb When spilling a live range that is used multiple times by one instruction, 
only add a reload live range once for the instruction.  This is one step
towards fixing a regalloc pessimization that Nate notice, but is later undone
by the spiller (so no code is changed).

llvm-svn: 23293
 2005-09-09 19:17:47 +00:00
Chris Lattner
5d16dbd5bb Fix a bug that Tzu-Chien Chiu noticed: live interval analysis does NOT 
preserve livevar

llvm-svn: 23259
 2005-09-07 17:34:39 +00:00
Chris Lattner
7138f91424 Teach live intervals to not crash on dead livein regs 
llvm-svn: 23206
 2005-09-02 00:20:32 +00:00
Chris Lattner
774158239b Simplify this code by using higher-level LiveVariables methods 
llvm-svn: 22989
 2005-08-23 22:51:41 +00:00
Chris Lattner
96cbfbbeaf Fix debug info to not print out recently freed memory. 
llvm-svn: 22529
 2005-07-27 23:11:25 +00:00
Chris Lattner
9937713252 Print symbolic register names in debug dumps 
llvm-svn: 22528
 2005-07-27 23:03:38 +00:00
Chris Lattner
c08d786ba5 Print the symbolic register name in a register allocator debug dump. 
llvm-svn: 22002
 2005-05-14 05:34:15 +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
1a44855f8f there is no need to remove this instruction, linscan does it already as it 
removes noop moves.

llvm-svn: 21183
 2005-04-09 16:24:20 +00:00