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280 Commits

Author SHA1 Message Date
Chris Lattner
1d16ec7381 Handle va_arg instruction correctly 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6030 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-05-08 02:50:13 +00:00
Chris Lattner
e96fda3002 Fix spelling 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5983 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-05-02 19:26:34 +00:00
Chris Lattner
3f2ec3925f Fix another case where constexprs could cause a crash 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5972 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-04-30 22:34:06 +00:00
Chris Lattner
fe32e0c578 Fix constant folding of constexprs 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5971 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-04-30 22:19:10 +00:00
Chris Lattner
619f825640 Fix bug: ADCE/2003-04-25-PHIPostDominateProblem.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5952 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-04-25 22:53:27 +00:00
Chris Lattner
bceb2b0061 Fix major problem with PHI node traversal: rechecking PHIs should go into 
the visit function.  The worklist is for when their lattice value changes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5927 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-04-25 03:35:10 +00:00
Chris Lattner
9de28289f8 Minor non-functional changes: 
* Spell propagate right
  * Improve performance of phi node handling
  * Delete using directive
  * Other minor changes


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5920 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-04-25 02:50:03 +00:00
Chris Lattner
e408e25132 Remove unnecesary &*'s 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5872 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-04-23 16:37:45 +00:00
Chris Lattner
fb242b6edc Change the interface to constant expressions to allow automatic folding 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5793 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-04-16 22:40:51 +00:00
Chris Lattner
e941291a7a Initial checkin of PRE on LLVM. This implementation is still lacking in 
several ways:

 * Load expressions are not PRE'd well.  Alias Analysis should be used to
   get accurate information when computing anticipatibility.
 * The expression collection implementation does not handle PHI nodes properly,
   thus the implementation misses many opportunities to PRE.
 * This code could be sped up quite a bit

Despite these flaws, the code seems to work well, and handles PR's as one
would expect.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5759 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-03-31 19:55:43 +00:00
Chris Lattner
c277eaa41e Move BreakCriticalEdges pass to lib/Transforms/Utils 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5754 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-03-21 21:43:19 +00:00
Chris Lattner
c8802d2c16 Add the following instcombine xforms: 
- Implement simple reassociation: (A|c1)|(B|c2) == (A|B)|(c1|c2)
  - (A & C1)+(B & C2) -> (A & C1)|(B & C2) iff C1&C2 == 0
  - (A & C1)^(B & C2) -> (A & C1)|(B & C2) iff C1&C2 == 0


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5743 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-03-11 00:12:48 +00:00
Chris Lattner
a4f445b28c Implement: -A*-B == A*B 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5740 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-03-10 23:23:04 +00:00
Chris Lattner
a27231acc0 Add new transformation: // (~A | ~B) == (~(A & B)) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5738 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-03-10 23:13:59 +00:00
Chris Lattner
8d96964e29 Generalize not and neg comparison testers to allow constant to be considered not'able and neg'able. This 
allows optimization of this:
int %test4(int %A, int %B) {
        %a = xor int %A, -1
        %c = and int %a, 5    ; 5 = ~c2
        %d = xor int %c, -1
        ret int %d
}

into this:
int %test4(int %A, int %B) {            ; No predecessors!
        %c.demorgan = or int %A, -6             ; <int> [#uses=1]
        ret int %c.demorgan
}


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5736 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-03-10 23:06:50 +00:00
Chris Lattner
4f98c56936 Generalize (A+c1)+c2 optimization to work with all associative operators 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5733 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-03-10 21:43:22 +00:00
Chris Lattner
28ba1aad99 Minor change, no functionality diff 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5731 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-03-10 19:20:30 +00:00
Chris Lattner
ea34005404 Fix bug: (x << 100) wasn't folded to 0, but (x >> 100) was (when x is unsigned) 
Implement new shift optimizations for shifting the result of a shift.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5729 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-03-10 19:16:08 +00:00
Chris Lattner
cb40a3749a Implement: (A|B)^B == A & (~B) 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5728 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-03-10 18:24:17 +00:00
Chris Lattner
decd0812ec Implement %test7 in InstCombine/getelementptr.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5704 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-03-05 22:33:14 +00:00
Chris Lattner
0252e49f6d Convert LICM over to use AliasSetTracker. Besides being nicer, this automatically 
allows LICM to use access sizes to help alias analysis be more precise.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5693 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-03-03 23:32:45 +00:00
Chris Lattner
fb743a937f Change the mem2reg interface to accept a TargetData argument 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5685 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-03-03 17:25:18 +00:00
Chris Lattner
caadc93f7b Fix bug: LICM/2003-02-28-PromoteDifferentType.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5675 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-02-28 19:21:40 +00:00
Chris Lattner
8601a9bf54 Fix bug: 2003-02-27-StoreSinkPHIs.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5658 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-02-27 21:59:36 +00:00
Chris Lattner
2d0a4a4eb8 Convert to work with new AliasAnalysis interface by conservatively assuming all pointers are arbitrarily large accesses 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5636 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-02-26 19:28:57 +00:00
Chris Lattner
f0a93ed9c5 Rename Instruction::hasSideEffects() -> mayWriteToMemory() 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5620 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-02-24 20:48:32 +00:00
Chris Lattner
2e6e741b73 Initial implementation of Loop invariant memory->scalar promotion 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5613 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-02-24 03:52:32 +00:00
Chris Lattner
ad3448c917 4 new transformations: 
* X*C + X --> X * (C+1)
  * X + X*C --> X * (C+1)
  * X - X*C --> X * (1-C)
  * X*C - X --> X * (C-1)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5592 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-02-18 19:57:07 +00:00
Chris Lattner
a2881961b9 Add a variety of new transformations: 
* A & ~A == 0
  * A / (2^c) == A >> c  if unsigned
  * 0 / A == 0
  * 1.0 * A == A
  * A * (2^c) == A << c
  * A ^ ~A == -1
  * A | ~A == -1
  * 0 % X = 0
  * A % (2^c) == A & (c-1) if unsigned
  * A - (A & B) == A & ~B
  * -1 - A == ~A


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5587 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-02-18 19:28:33 +00:00
Chris Lattner
bac74584f1 Fix typo 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5458 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-02-01 04:50:59 +00:00
Chris Lattner
d7f268d418 Fix bug: ADCE/2003-01-22-PredecessorProblem.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5405 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-01-23 02:12:18 +00:00
Chris Lattner
4d0a82da2d Fix a huge performance problem in reassociate by introducing a 
rank map cache for instruction ranks


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5030 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-12-15 03:56:00 +00:00
Chris Lattner
680f0c283d Minor changes: 
* Reword comment to make more clear
  * Don't print out BB's after modification made
  * Don't delete and new an instruction when we need to move something, just move it.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@5029 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-12-15 03:49:50 +00:00
Chris Lattner
342d1826fb Remove dead code 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4952 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-12-07 18:42:13 +00:00
Chris Lattner
c736d56562 Fix bug: 2002-12-05-MissedConstProp.ll pointed out by Casey Carter 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4935 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-12-05 22:41:53 +00:00
Chris Lattner
6e6026b465 - Eliminated the deferred symbol table stuff in Module & Function, it really 
wasn't an optimization and it was causing lots of bugs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4779 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-11-20 18:36:02 +00:00
Chris Lattner
0006bd7520 Fix warning 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4649 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-11-09 00:49:43 +00:00
Chris Lattner
51c20e9a3a Fix spelling error 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4645 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-11-08 23:18:37 +00:00
Chris Lattner
0188534cd1 Instcombine this away: 
%A = getelementptr [4 x int]* %M, long 0, long 0
        %B = getelementptr int* %A, long 2


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4536 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-11-04 16:43:32 +00:00
Chris Lattner
0864acf07b Add a transformation to turn: 
malloc Ty, C
int
  malloc [C x Ty], 1


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4534 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-11-04 16:18:53 +00:00
Chris Lattner
af663465d6 Make sure to _delete_ memory allocated by worklists 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4523 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-11-04 02:54:22 +00:00
Chris Lattner
e4b730441d Fixes to the reassociate pass to make it respect dominance properties 
Huge thanks go to Casey Carter for writing this fix, reassociate is now
reoperational!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4471 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-10-31 17:12:59 +00:00
Chris Lattner
6918c079a1 BreakCriticalEdges should update dominance frontier information as well as 
other dominance stuff.  Patch contributed by Casey Carter


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4457 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-10-31 02:44:36 +00:00
Misha Brukman
a3bbcb5b66 Fix spelling of `propagate'. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4423 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-10-29 23:06:16 +00:00
Chris Lattner
cb2610ea03 - Rename AnalysisUsage::preservesAll to getPreservesAll & preservesCFG to 
setPreservesCFG to be less confusing.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4255 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-10-21 20:00:28 +00:00
Chris Lattner
d3d06a5cd8 - Fix bug: cee/2002-10-07-NoImmediateDominator.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4081 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-10-08 21:53:51 +00:00
Chris Lattner
f7f009d9a5 - Checkin LARGE number of Changes to CEE pass that will make it much more 
powerful, but that are largely disabled.  The basic idea here is that it
    is trying to forward branches across basic blocks that have PHI nodes in
    it, which are crucial to be able to handle cases like whet.ll.
    Unfortunately we are not updating SSA correctly, causing sim.c to die, and I
    don't have time to fix the regression now, so I must disable the
    functionality.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4077 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-10-08 21:34:15 +00:00
Chris Lattner
e802a023d9 Expose isCriticalEdge & SplitCriticalEdge methods from crit-edges pass 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4075 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-10-08 21:06:27 +00:00
Chris Lattner
57b314cfb1 It is illegal for PHI nodes to have zero values, delete the code to handle them 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4071 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-10-08 17:07:39 +00:00
Chris Lattner
6eaeb5764c Fold ashr -1, X into -1 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4070 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-10-08 16:16:40 +00:00