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2cd9196e87
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106 Commits

Author SHA1 Message Date
Chris Lattner
2cd9196e87 Add comments 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7283 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-07-23 21:41:57 +00:00
Chris Lattner
eca0c5c379 Remove explicit check for: not (not X) = X, it is already handled because xor is commutative 
- InstCombine: (X & C1) ^ C2 --> (X & C1) | C2 iff (C1&C2) == 0
  - InstCombine: (X | C1) ^ C2 --> (X | C1) & ~C2 iff (C1&C2) == C2


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7282 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-07-23 21:37:07 +00:00
Chris Lattner
06782f804f InstCombine: (X ^ C1) & C2 --> (X & C2) iff (C1&C2) == 0 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7272 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-07-23 19:36:21 +00:00
Chris Lattner
5840326ae6 - InstCombine: (X | C1) & C2 --> X & C2 iff C1 & C1 == 0 
- InstCombine: (X | C) & C --> C
  - InstCombine: (X | C1) & C2 --> (X | (C1&C2)) & C2


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7269 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-07-23 19:25:52 +00:00
Chris Lattner
ad44ebfff0 IC: (X & C1) | C2 --> (X | C2) & (C1|C2) 
IC: (X ^ C1) | C2 --> (X | C2) ^ (C1&~C2)

We are now guaranteed that all 'or's will be inside of 'and's, and all 'and's
will be inside of 'xor's, if the second operands are constants.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7264 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-07-23 18:29:44 +00:00
Chris Lattner
c6a8aff3f6 IC: (X ^ C1) & C2 --> (X & C2) ^ (C1&C2) 
Minor code cleanup


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7262 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-07-23 17:57:01 +00:00
Chris Lattner
00b1a7e23e InstCombine: (X ^ 4) == 8 --> X == 12 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7260 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-07-23 17:26:36 +00:00
Chris Lattner
bc5d414823 IC: (X & 5) == 13 --> false 
IC: (X | 8) == 4  --> false


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7257 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-07-23 17:02:11 +00:00
Chris Lattner
c07736a397 Simplify code by using ConstantInt::getRawValue instead of checking to see 
whether the constant is signed or unsigned, then casting


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7252 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-07-23 15:22:26 +00:00
Chris Lattner
1ba5bcd1ae - InstCombine (cast (xor A, B) to bool) ==> (setne A, B) 
- InstCombine (cast (and X, (1 << size(X)-1)) to bool) ==> x < 0


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7241 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-07-22 21:46:59 +00:00
John Criswell
067947380c Added code that checks to see if a global variable is external before replacing 
a load of the global variable with the variable's constant value.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7216 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-07-21 19:42:57 +00:00
John Criswell
a676b78791 Dinakar and I fixed a bug where we were trying to get the initializer of 
an external constant.  Since external constants don't have initializers, we
were failing on an assert() call in llvm/GlobalVariable.h.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@7193 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-07-17 19:06:55 +00:00
Chris Lattner
833b8a4181 Add support for elimination of load instruction from global constants 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6912 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-06-26 05:06:25 +00:00
Chris Lattner
0af1fab019 Instcombine: X * -1 -> -X 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6904 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-06-25 17:09:20 +00:00
Chris Lattner
79d35b3f8b Implement new transforms: 
Replace (cast (sub A, B) to bool) -> (setne A, B)
  Replace (cast (add A, B) to bool) -> (setne A, -B)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6873 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-06-23 21:59:52 +00:00
Chris Lattner
797249bc13 Instcombine cast (getelementptr Ptr, 0, 0, 0) to ... into: cast Ptr to ... 
This fixes type safety problems in a variety of benchmarks that were confusing
DSA.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6837 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-06-21 23:12:02 +00:00
Chris Lattner
9fe3886678 Implement the functionality of InstCombine/call.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6783 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-06-19 17:00:31 +00:00
Chris Lattner
9b5fd22bd9 Fix bug: InstCombine/2003-06-05-BranchInvertInfLoop.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6630 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-06-05 20:12:51 +00:00
Chris Lattner
40f5d70db4 Clean up previous code. 
Add new combination to turn seteq X, 0 -> not(cast X to bool)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6604 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-06-04 05:10:11 +00:00
Chris Lattner
c4d10ebcd7 Implement combination of boolean not with branch 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6599 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-06-04 04:46:00 +00:00
Chris Lattner
074d84c746 Implement xform: (X != 0) -> (bool)X 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6506 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-06-01 03:35:25 +00:00
Chris Lattner
2a9c847f25 Fix bug: Instcombine/2003-05-27-ConstExprCrash.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6352 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-05-27 16:40:51 +00:00
Chris Lattner
bd4ecf769d Fix bug: InstCombine/2003-05-26-CastMiscompile.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6338 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-05-26 23:41:32 +00:00
Chris Lattner
c54e2b8f84 Minor cleanups. 
This hunk:
-    } else if (Src->getNumOperands() == 2 && Src->use_size() == 1) {
+    } else if (Src->getNumOperands() == 2) {

Allows GEP folding to be more aggressive, which reduces the number of instructions
and can dramatically speed up BasicAA in some cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6286 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-05-22 19:07:21 +00:00
Misha Brukman
f117cc9ee6 s/convertable/convertible/g 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@6248 91177308-0d34-0410-b5e6-96231b3b80d8
 2003-05-20 18:45:36 +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
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
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
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
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
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
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
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
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
Chris Lattner
a92f696b74 Updates to work with recent Statistic's changes: 
* Renamed StatisticReporter.h/cpp to Statistic.h/cpp
    * Broke constructor to take two const char * arguments instead of one, so
      that indendation can be taken care of automatically.
    * Sort the list by pass name when printing
    * Make sure to print all statistics as a group, instead of randomly when
      the statistics dtors are called.
    * Updated ProgrammersManual with new semantics.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@4002 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-10-01 22:38:41 +00:00
Chris Lattner
d06451f920 Optimize away cases like: 
%cast109 = cast uint %cast212 to short          ; <short> [#uses=1]
        %cast214 = cast short %cast109 to uint          ; <uint> [#uses=1]
        %cast215 = cast uint %cast214 to short          ; <short> [#uses=1]


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3897 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-09-23 23:39:43 +00:00
Chris Lattner
dfcbf01222 Fix bug: test/Regression/Transforms/InstCombine/2002-09-17-GetElementPtrCrash.ll 
Thanks to Casey for finding it!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3783 91177308-0d34-0410-b5e6-96231b3b80d8
 2002-09-17 21:05:42 +00:00