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925 Commits

Author SHA1 Message Date
Chris Lattner
693787a5ec Instcombine: cast (X != 0) to int, cast (X == 1) to int -> X iff X has only the low bit set. 
This implements set.ll:test20.

This triggers 2x on povray, 9x on mesa, 11x on gcc, 2x on crafty, 1x on eon,
6x on perlbmk and 11x on m88ksim.

It allows us to compile these two functions into the same code:

struct s { unsigned int bit : 1; };
unsigned foo(struct s *p) {
  if (p->bit)
    return 1;
  else
    return 0;
}
unsigned bar(struct s *p) { return p->bit; }


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21690 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-04 19:10:26 +00:00
Chris Lattner
9fb25db11e Implement getelementptr.ll:test11 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21647 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-01 04:42:15 +00:00
Chris Lattner
37366c1ba8 Check for volatile loads only once. 
Implement load.ll:test7


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21645 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-05-01 04:24:53 +00:00
Chris Lattner
93b94a6ccf Fix the compile failures from last night. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21565 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-26 14:40:41 +00:00
Chris Lattner
a70b66d49e implement getelementptr.ll:test10 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21541 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-25 20:17:30 +00:00
Chris Lattner
f52d681657 Eliminate cases where we could << by 64, which is undefined in C. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21500 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-24 17:46:05 +00:00
Chris Lattner
a1df33c0ee Implement xor.ll:test21: select (not C), A, B -> select C, B, A 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21495 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-24 07:30:14 +00:00
Chris Lattner
484d3cf0e3 Use getPrimitiveSizeInBits() instead of getPrimitiveSize()*8 
Completely rework the 'setcc (cast x to larger), y' code.  This code has
the advantage of implementing setcc.ll:test19 (being more general than
the previous code) and being correct in all cases.

This allows us to unxfail 2004-11-27-SetCCForCastLargerAndConstant.ll,
and close PR454.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21491 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-24 06:59:08 +00:00
Jeff Cohen
9d80930e95 Eliminate tabs and trailing spaces 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21480 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-23 21:38:35 +00:00
Chris Lattner
6970b661cb Generalize the setcc -> PHI and Select folding optimizations to work with 
any constant RHS, not just a constant integer RHS.  This implements
select.ll:test17


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21470 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-23 15:31:55 +00:00
Misha Brukman
fd93908ae8 Remove trailing whitespace 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21427 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-21 23:48:37 +00:00
Chris Lattner
956db27a63 Instcombine this: 
%shortcirc_val = select bool %tmp.1, bool true, bool %tmp.4             ; <bool> [#uses=1]
        %tmp.6 = cast bool %shortcirc_val to int                ; <int> [#uses=1]

into this:

        %shortcirc_val = or bool %tmp.1, %tmp.4         ; <bool> [#uses=1]
        %tmp.6 = cast bool %shortcirc_val to int                ; <int> [#uses=1]

not this:

        %tmp.4.cast = cast bool %tmp.4 to int           ; <int> [#uses=1]
        %tmp.6 = select bool %tmp.1, int 1, int %tmp.4.cast             ; <int> [#uses=1]


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21389 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-21 05:43:13 +00:00
Chris Lattner
7d27fc0252 Wrap some long lines. 
Make IPSCCP strip off dead constant exprs that are using functions, making
them appear as though their address is taken.  This allows us to propagate
some more pool descriptors, lowering the overhead of pool alloc.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21363 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-19 19:16:19 +00:00
Chris Lattner
240d6f4c9d Eliminate a broken transformation, fixing PR548 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21354 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-19 06:04:18 +00:00
Chris Lattner
ea96b5edbb silence a bogus warning 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21320 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-18 05:26:21 +00:00
Chris Lattner
36d12733bb a new simple pass, which will be extended to be more useful in the future. 
This pass forward branches through conditions when it can show that the
conditions is either always true or false for a predecessor.  This currently
only handles the most simple cases of this, but is successful at threading
across 2489 branches and 65 switch instructions in 176.gcc, which isn't bad.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21306 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-15 19:28:32 +00:00
Chris Lattner
bf70b838e7 Fix bug: InstCombine/2005-05-07-UDivSelectCrash.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21152 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-08 04:03:26 +00:00
Chris Lattner
7edc8c223e Implement the following xforms: 
(X-Y)-X --> -Y
A + (B - A) --> B
(B - A) + A --> B


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21138 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-07 17:14:51 +00:00
Chris Lattner
08954a26e4 Implement InstCombine/add.ll:test28, transforming C1-(X+C2) --> (C1-C2)-X. 
This occurs several dozen times in specint2k, particularly in crafty and gcc
apparently.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21136 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-07 16:28:01 +00:00
Chris Lattner
43d84d6b71 Transform X-(X+Y) == -Y and X-(Y+X) == -Y 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21134 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-04-07 16:15:25 +00:00
Chris Lattner
b1515fe522 disable this transformation in the one obscure case that really pessimizes 
pointer analysis.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20916 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-29 06:37:47 +00:00
Chris Lattner
70ac2dcb84 Fix a bug where LICM was not updating AA information properly when sinking 
a pointer value out of a loop causing it to be duplicated.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20828 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-25 00:22:36 +00:00
Chris Lattner
1f309c1a4e enable -debug-only=licm 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20788 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-23 21:00:12 +00:00
Chris Lattner
e4d5c441e0 This mega patch converts us from using Function::a{iterator|begin|end} to 
using Function::arg_{iterator|begin|end}.  Likewise Module::g* -> Module::global_*.

This patch is contributed by Gabor Greif, thanks!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20597 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-15 04:54:21 +00:00
Chris Lattner
2f62fdc9a7 fix a bug where we thought arguments were constants :( 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20506 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-06 22:52:29 +00:00
Chris Lattner
3f93197098 Fix Regression/Transforms/LoopStrengthReduce/dont_insert_redundant_ops.ll, 
hopefully not breaking too many other things.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20505 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-06 22:36:12 +00:00
Chris Lattner
2f9b19b4c9 implement Transforms/LoopStrengthReduce/invariant_value_first_arg.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20501 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-06 22:06:22 +00:00
Chris Lattner
2461dff070 minor simplifications of the code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20497 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-06 21:58:22 +00:00
Chris Lattner
decc86db0c Fix a bug where we could corrupt a parent loop's header info if we unrolled 
a nested loop.  This fixes Transforms/LoopUnroll/2005-03-06-BadLoopInfoUpdate.ll
and PR532


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20493 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-06 20:57:32 +00:00
Jeff Cohen
e43dd1b8e7 Reformat comments to fix 80 columns. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20467 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-05 22:45:40 +00:00
Jeff Cohen
b21bf9a8d5 Reuse induction variables created for strength-reduced GEPs by other similar GEPs. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20466 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-05 22:40:34 +00:00
Chris Lattner
8b9081081b Do not compute 1ULL << 64, which is undefined. This fixes Ptrdist/ks on the 
sparc, and testcase Regression/Transforms/InstCombine/2005-03-04-ShiftOverflow.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20445 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-04 23:21:33 +00:00
Jeff Cohen
2f3c9b7562 Add support for not strength reducing GEPs where the element size is a small 
power of two.  This emphatically includes the zeroeth power of two.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20429 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-04 04:04:26 +00:00
Jeff Cohen
0456e4a079 Fixed the following LSR bugs: 
* Loop invariant code does not dominate the loop header, but rather
    the end of the loop preheader.

  * The base for a reduced GEP isn't a constant unless all of its
    operands (preceding the induction variable) are constant.

  * Allow induction variable elimination for the simple case after all.

Also made changes recommended by Chris for properly deleting
instructions.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20383 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-03-01 03:46:11 +00:00
Jeff Cohen
14dc638081 Fix crash in LSR due to attempt to remove original induction variable. However, 
for reasons explained in the comments, I also deactivated this code as it needs
more thought.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20367 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-02-28 00:08:56 +00:00
Jeff Cohen
5e1e5e13ff PHI nodes were incorrectly placed when more than one GEP is reduced in a loop. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20360 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-02-27 21:08:04 +00:00
Jeff Cohen
f465db6c6a First pass at improved Loop Strength Reduction. Still not yet ready for prime time. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20358 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-02-27 19:37:07 +00:00
Chris Lattner
cfa2f8eef4 Remove use of bind_obj 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20276 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-02-22 23:22:58 +00:00
Chris Lattner
1a84bd38ef Do not mark obviously unreachable blocks live when processing PHI nodes, 
and handle incomplete control dependences correctly.  This fixes:

Regression/Transforms/ADCE/dead-phi-edge.ll
  -> a missed optimization

Regression/Transforms/ADCE/dead-phi-edge.ll
  -> a compiler crash distilled from QT4


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20227 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-02-17 19:28:49 +00:00
Chris Lattner
8a7980b5ea Fix the second bug attached to PR504. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20181 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-02-14 20:11:45 +00:00
Chris Lattner
f6249261a9 Fix for testcase Transforms/IndVarsSimplify/2005-02-11-InvokeCrash.ll 
and PR504.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20129 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-02-12 03:26:49 +00:00
Chris Lattner
ac930048d6 API change. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19959 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-02-01 01:23:49 +00:00
Chris Lattner
fcfe33acda Implement InstCombine/cast.ll:test25, a case that occurs many times 
in spec


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19953 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-31 05:51:45 +00:00
Chris Lattner
2f503e6c27 Implement the trivial cases in InstCombine/store.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19950 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-31 05:36:43 +00:00
Chris Lattner
f9527850e6 Implement Transforms/InstCombine/cast-load-gep.ll, which allows us to devirtualize 
11 indirect calls in perlbmk.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19947 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-31 04:50:46 +00:00
Chris Lattner
5551706b0f Adjust to changes in instruction interfaces. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19900 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-29 00:39:08 +00:00
Chris Lattner
ad5fec12a0 * add some DEBUG statements 
* Properly compile this:

struct a {};
int test() {
  struct a b[2];
  if (&b[0] != &b[1])
    abort ();
  return 0;
}

to 'return 0', not abort().


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19875 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-28 19:32:01 +00:00
Chris Lattner
ad1e302723 Get rid of a several dozen more and instructions in specint. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19786 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-23 20:26:55 +00:00
Chris Lattner
45f57b8ee3 Handle comparisons of gep instructions that have different typed indices 
as long as they are the same size.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19734 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-21 23:06:49 +00:00
Chris Lattner
6fb5a4a5f8 Add two optimizations. The first folds (X+Y)-X -> Y 
The second folds operations into selects, e.g. (select C, (X+Y), (Y+Z))
-> (Y+(select C, X, Z)

This occurs a few times across spec, e.g.

         select    add/sub
mesa:    83        0
povray:  5         2
gcc      4         2
parser   0         22
perlbmk  13        30
twolf    0         3


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19706 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-19 21:50:18 +00:00
Chris Lattner
a3fd1c569c Delete PHI nodes that are not dead but are locked in a cycle of single 
useness.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19629 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-17 05:10:15 +00:00
Chris Lattner
b352fa5853 Move code out of indentation one level to make it easier to read. 
Disable the xform for < > cases.  It turns out that the following is being
miscompiled:

bool %test(sbyte %S) {
        %T = cast sbyte %S to uint
        %V = setgt uint %T, 255
        ret bool %V
}


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19628 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-17 03:20:02 +00:00
Chris Lattner
906ab50acf Fix some bugs in an xform added yesterday. This fixes Prolangs-C/allroots. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19553 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-14 17:35:12 +00:00
Chris Lattner
6f7f02fdec Fix a compile crash on spiff 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19552 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-14 17:17:59 +00:00
Chris Lattner
4401c9cabe if two gep comparisons only differ by one index, compare that index directly. 
This allows us to better optimize begin() -> end() comparisons in common cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19542 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-14 00:20:05 +00:00
Chris Lattner
0b84c80c08 Do not overrun iterators. This fixes a 176.gcc crash 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19541 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-13 23:26:48 +00:00
Chris Lattner
87875dac89 Turn select C, (X+Y), (X-Y) --> (X+(select C, Y, (-Y))). This occurs in 
the 'sim' program and probably elsewhere.  In sim, it comes up for cases
like this:

#define round(x) ((x)>0.0 ? (x)+0.5 : (x)-0.5)
double G;
void T(double X) { G = round(X); }

(it uses the round macro a lot).  This changes the LLVM code from:

        %tmp.1 = setgt double %X, 0.000000e+00          ; <bool> [#uses=1]
        %tmp.4 = add double %X, 5.000000e-01            ; <double> [#uses=1]
        %tmp.6 = sub double %X, 5.000000e-01            ; <double> [#uses=1]
        %mem_tmp.0 = select bool %tmp.1, double %tmp.4, double %tmp.6
        store double %mem_tmp.0, double* %G

to:

        %tmp.1 = setgt double %X, 0.000000e+00          ; <bool> [#uses=1]
        %mem_tmp.0.p = select bool %tmp.1, double 5.000000e-01, double -5.000000e-01
        %mem_tmp.0 = add double %mem_tmp.0.p, %X
        store double %mem_tmp.0, double* %G
        ret void


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19537 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-13 22:52:24 +00:00
Chris Lattner
e9d782b7be Implement an optimization for == and != comparisons like this: 
_Bool test2(int X, int Y) {
  return &arr[X][Y] == arr;
}

instead of generating this:

bool %test2(int %X, int %Y) {
        %tmp.3.idx = mul int %X, 160            ; <int> [#uses=1]
        %tmp.3.idx1 = shl int %Y, ubyte 2               ; <int> [#uses=1]
        %tmp.3.offs2 = sub int 0, %tmp.3.idx            ; <int> [#uses=1]
        %tmp.7 = seteq int %tmp.3.idx1, %tmp.3.offs2            ; <bool> [#uses=1]
        ret bool %tmp.7
}


generate this:

bool %test2(int %X, int %Y) {
        seteq int %X, 0         ; <bool>:0 [#uses=1]
        seteq int %Y, 0         ; <bool>:1 [#uses=1]
        %tmp.7 = and bool %0, %1                ; <bool> [#uses=1]
        ret bool %tmp.7
}

This idiom occurs in C++ programs when iterating from begin() to end(),
in a vector or array.  For example, we now compile this:

void test(int X, int Y) {
  for (int *i = arr; i != arr+100; ++i)
    foo(*i);
}

to this:

no_exit:                ; preds = %entry, %no_exit
	...
        %exitcond = seteq uint %indvar.next, 100                ; <bool> [#uses=1]
        br bool %exitcond, label %return, label %no_exit



instead of this:

no_exit:                ; preds = %entry, %no_exit
	...
        %inc5 = getelementptr [100 x [40 x int]]* %arr, int 0, int 0, int %inc.rec              ; <int*> [#uses=1]
        %tmp.8 = seteq int* %inc5, getelementptr ([100 x [40 x int]]* %arr, int 0, int 100, int 0)              ; <bool> [#uses=1]
        %indvar.next = add uint %indvar, 1              ; <uint> [#uses=1]
        br bool %tmp.8, label %return, label %no_exit


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19536 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-13 22:25:21 +00:00
Chris Lattner
5bdf04cc8e Fix some bugs in code I didn't mean to check in. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19534 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-13 20:40:58 +00:00
Chris Lattner
574da9ba0b Fix a crash compiling 129.compress 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19533 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-13 20:14:25 +00:00
Chris Lattner
652f3cf76f Fix uint64_t -> unsigned VS warnings. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19381 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-08 19:42:22 +00:00
Chris Lattner
d4bc564531 Silence VS warnings. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19380 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-08 19:37:20 +00:00
Chris Lattner
2cc34627bb Silence warnings 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19379 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-08 19:34:41 +00:00
Jeff Cohen
bf65268def Add more missing createXxxPass functions. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19370 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-08 17:21:40 +00:00
Jeff Cohen
f5e58f8f43 Put createLoopUnswitchPass() into proper namespace 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19306 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-06 05:47:18 +00:00
Chris Lattner
6e7ba45460 This is a bulk commit that implements the following primary improvements: 
* We can now fold cast instructions into select instructions that
    have at least one constant operand.
  * We now optimize expressions more aggressively based on bits that are
    known to be zero.  These optimizations occur a lot in code that uses
    bitfields even in simple ways.
  * We now turn more cast-cast sequences into AND instructions.  Before we
    would only do this if it if all types were unsigned.  Now only the
    middle type needs to be unsigned (guaranteeing a zero extend).
  * We transform sign extensions into zero extensions in several cases.

This corresponds to these test/Regression/Transforms/InstCombine testcases:
  2004-11-22-Missed-and-fold.ll
  and.ll: test28-29
  cast.ll: test21-24
  and-or-and.ll
  cast-cast-to-and.ll
  zeroext-and-reduce.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19220 91177308-0d34-0410-b5e6-96231b3b80d8
 2005-01-01 16:22:27 +00:00
Chris Lattner
da16d8c00b Fix PR491 and testcase Transforms/DeadStoreElimination/2004-12-28-PartialStore.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19180 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-29 04:36:02 +00:00
Chris Lattner
68a9d3eb38 Adjust to new interfaces 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18958 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-15 07:22:25 +00:00
Chris Lattner
0ce8580fcd Constant exprs are not efficiently negatable in practice. This disables 
turning X - (constantexpr) into X + (-constantexpr) among other things.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18935 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-14 20:08:06 +00:00
Chris Lattner
6b8efcd697 Change indentation of a whole bunch of code, no real changes here. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18843 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-12 23:49:37 +00:00
Chris Lattner
387bc13575 More substantial simplifications and speedups. This makes ADCE about 20% faster 
in some cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18842 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-12 23:40:17 +00:00
Chris Lattner
46356794ab More minor microoptimizations 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18841 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-12 22:44:30 +00:00
Chris Lattner
4e51ccdd38 Remove some more set operations 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18840 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-12 22:22:18 +00:00
Chris Lattner
188839a219 Reduce number of set operations. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18839 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-12 22:16:13 +00:00
Chris Lattner
857e8cdd65 Optimize div/rem + select combinations more. 
In particular, implement div.ll:test10 and rem.ll:test4.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18838 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-12 21:48:58 +00:00
Chris Lattner
fb851ab281 Simplify code and do not invalidate iterators. 
This fixes a crash compiling TimberWolfMC that was exposed due to recent
optimizer changes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18831 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-12 18:23:20 +00:00
Chris Lattner
a177c67471 If one side of and/or is known to be 0/-1, it doesn't matter 
if the other side is overdefined.

This allows us to fold conditions like:  if (X < Y || Y > Z) in some cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18807 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-11 23:15:19 +00:00
Chris Lattner
dade2d22ba Two bug fixes: 
1. Actually increment the Statistic for the GV elim optzn
 2. When resolving undef branches, only resolve branches in executable blocks,
    avoiding marking a bunch of completely dead blocks live.  This has a big
    impact on the quality of the generated code.

With this patch, we positively rip up vortex, compiling Ut_MoveBytes to a
single memcpy call. In vortex we get this:

     12 ipsccp           - Number of globals found to be constant
    986 ipsccp           - Number of arguments constant propagated
   1378 ipsccp           - Number of basic blocks unreachable
   8919 ipsccp           - Number of instructions removed


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18796 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-11 06:05:53 +00:00
Chris Lattner
864737bf9e Do not delete the entry block to a function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18795 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-11 05:32:19 +00:00
Chris Lattner
dd336d196e Implement Transforms/SCCP/ipsccp-gvar.ll, by tracking values stored to 
non-address-taken global variables.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18790 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-11 05:15:59 +00:00
Chris Lattner
0417feba29 Fix a bug where we could delete dead invoke instructions with uses. 
In functions where we fully constant prop the return value, replace all
ret instructions with 'ret undef'.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18786 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-11 02:53:57 +00:00
Chris Lattner
5f9e8b4c3f Implement SCCP/ipsccp-conditional.ll, by totally deleting dead blocks. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18781 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-10 22:29:08 +00:00
Chris Lattner
fc6ac50619 Fix SCCP/2004-12-10-UndefBranchBug.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18776 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-10 20:41:50 +00:00
Chris Lattner
59acc7d4ef This is the initial implementation of IPSCCP, as requested by Brian. 
This implements SCCP/ipsccp-basic.ll, rips apart Olden/mst (as described in
PR415), and does other nice things.

There is still more to come with this, but it's a start.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18752 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-10 08:02:06 +00:00
Chris Lattner
13eaf4f14d note to self: Do not check in debugging code! 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18693 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-09 07:15:52 +00:00
Chris Lattner
96a52a6f6c Implement trivial sinking for load instructions. This causes us to sink 567 loads in spec 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18692 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-09 07:14:34 +00:00
Chris Lattner
ea1c45405d Do extremely simple sinking of instructions when they are only used in a 
successor block.  This turns cases like this:

x = a op b
if (c) {
  use x
}

into:

if (c) {
  x = a op b
  use x
}

This triggers 3965 times in spec, and is tested by
Regression/Transforms/InstCombine/sink_instruction.ll

This appears to expose a bug in the X86 backend for 177.mesa, which I'm
looking in to.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18677 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-08 23:43:58 +00:00
Alkis Evlogimenos
54a96a2ad6 Fix this regression and remove the XFAIL from this test. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18674 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-08 23:10:30 +00:00
Chris Lattner
2a0cd9c9b5 Fix Transforms/InstCombine/2004-12-08-RemInfiniteLoop.ll 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18670 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-08 22:20:34 +00:00
Chris Lattner
6992afcdb9 This pass is moving to lib IPO 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18439 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-12-02 21:24:40 +00:00
Chris Lattner
6b205c3ef1 This pass is completely broken. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18387 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-30 17:09:06 +00:00
Chris Lattner
8a9193927a Allow hoisting loads of globals and alloca's in conditionals. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18363 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-29 21:26:12 +00:00
Reid Spencer
6731d5c494 Fix for PR454: 
* Make sure we handle signed to unsigned conversion correctly
* Move this visitSetCondInst case to its own method.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18312 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-28 21:31:15 +00:00
Chris Lattner
8305a64dce Make DSE potentially more aggressive by being more specific about alloca sizes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18309 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-28 20:44:37 +00:00
Chris Lattner
646641e02c Implement Regression/Transforms/InstCombine/getelementptr_cast.ll, which 
occurs many times in crafty


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18273 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-27 17:55:46 +00:00
Chris Lattner
f3e1d6977e Provide size information when checking to see if we can LICM a load, this 
allows us to hoist more loads in some cases.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18265 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-26 21:20:09 +00:00
Chris Lattner
b9df9b4c88 Do not count debugger intrinsics in size estimation. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18110 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-22 17:23:57 +00:00
Chris Lattner
64613ea8c8 Do not consider debug intrinsics in the size computations for loop unrolling. 
Patch contributed by Michael McCracken!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@18108 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-22 17:18:36 +00:00
Chris Lattner
7b73a663bc Fix the exposed prototype for the lower packed pass, thanks to 
Morten Ofstad.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17996 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-19 16:49:34 +00:00
Chris Lattner
954f66a8cd Delete stoppoints that occur for the same source line. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17970 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-18 21:41:39 +00:00
Chris Lattner
56de0363e3 Check in hook that I forgot 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17956 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-18 17:24:20 +00:00
Chris Lattner
73559b1f4c Do not delete dead invoke instructions! 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17897 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-16 16:32:28 +00:00
Reid Spencer
96326f9d31 Remove unused variable for compilation by VC++. 
Patch contributed by Morten Ofstad.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17830 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-15 17:29:41 +00:00
Chris Lattner
14051812ff Minor cleanups. There is no reason for SCCP to derive from instvisitor anymore. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17825 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-15 07:15:04 +00:00
Chris Lattner
b77d5d8d50 Count more accurately 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17824 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-15 07:02:42 +00:00
Chris Lattner
50e60c7026 Quiet warnings on the persephone tester 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17821 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-15 05:54:07 +00:00
Chris Lattner
7e529e4b3c Two minor improvements: 
1. Speedup getValueState by having it not consider Arguments.  It's better
    to just add them before we start SCCP'ing.
 2. SCCP can delete the contents of dead blocks.  No really, it's ok!  This
    reduces the size of the IR for subsequent passes, even though
    simplifycfg would do the same job.  In practice, simplifycfg does not
    run until much later than sccp in gccas


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17820 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-15 05:45:33 +00:00
Chris Lattner
ef36dfd31a rename InstValue to LatticeValue, as it holds for more than instructions. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17818 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-15 05:03:30 +00:00
Chris Lattner
82bec2cff0 Substantially refactor the SCCP class into an SCCP pass and an SCCPSolver 
class.  The only changes are minor:

 * Do not try to SCCP instructions that return void in the rewrite loop.
   This is silly and fool hardy, wasting a map lookup and adding an entry
   to the map which is never used.
 * If we decide something has an undefined value, rewrite it to undef,
   potentially leading to further simplications.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17816 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-15 04:44:20 +00:00
Chris Lattner
b58934484b This optimization makes MANY phi nodes that all have the same incoming value. 
If this happens, detect it early instead of relying on instcombine to notice
it later.  This can be a big speedup, because PHI nodes can have many
incoming values.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17741 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-14 19:29:34 +00:00
Chris Lattner
bac32866a7 Implement instcombine/phi.ll:test6 - pulling operations through PHI nodes. 
This exposes subsequent optimization possiblities and reduces code size.
This triggers 1423 times in spec.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17740 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-14 19:13:23 +00:00
Chris Lattner
711b3402aa Transform this: 
%X = alloca ...
  %Y = alloca ...
    X == Y

into false.  This allows us to simplify some stuff in eon (and probably
many other C++ programs) where operator= was checking for self assignment.
Folding this allows us to SROA several additional structs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17735 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-14 07:33:16 +00:00
Chris Lattner
d878ecd904 Teach SROA how to promote an array index that is variable, if the dimension 
of the array is just two.  This occurs 8 times in gcc, 6 times in crafty, and
12 times in 099.go.

This implements ScalarRepl/sroa_two.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17727 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-14 05:00:19 +00:00
Chris Lattner
f5990edc87 Rearrange some code, no functionality changes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17724 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-14 04:24:28 +00:00
Chris Lattner
50af16a97b Simplify handling of shifts to be the same as we do for adds. Add support 
for (X * C1) + (X * C2) (where * can be mul or shl), allowing us to fold:

   Y+Y+Y+Y+Y+Y+Y+Y

into
         %tmp.8 = shl long %Y, ubyte 3           ; <long> [#uses=1]

instead of

        %tmp.4 = shl long %Y, ubyte 2           ; <long> [#uses=1]
        %tmp.12 = shl long %Y, ubyte 2          ; <long> [#uses=1]
        %tmp.8 = add long %tmp.4, %tmp.12               ; <long> [#uses=1]

This implements add.ll:test25

Also add support for (X*C1)-(X*C2) -> X*(C1-C2), implementing sub.ll:test18


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17704 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-13 19:50:12 +00:00
Chris Lattner
65aedc1a4e Fold: 
(X + (X << C2)) --> X * ((1 << C2) + 1)
   ((X << C2) + X) --> X * ((1 << C2) + 1)

This means that we now canonicalize "Y+Y+Y" into:

        %tmp.2 = mul long %Y, 3         ; <long> [#uses=1]

instead of:

        %tmp.10 = shl long %Y, ubyte 1          ; <long> [#uses=1]
        %tmp.6 = add long %Y, %tmp.10               ; <long> [#uses=1]


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17701 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-13 19:31:40 +00:00
Chris Lattner
00a4fe48ac This is V9 specific, move it there. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17545 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-07 00:39:26 +00:00
Chris Lattner
f158092801 Fix some warnings on VC++ 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17481 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-05 04:45:43 +00:00
Chris Lattner
d308f8a87f * Rearrange code slightly 
* Disable broken transforms for simplifying (setcc (cast X to larger), CI)
  where CC is not != or ==


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17422 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-02 03:50:32 +00:00
Chris Lattner
7e54a01ddb Speed up the tail duplication pass on the testcase below from 68.2s to 1.23s: 
#define CL0(a) case a: f(); goto c;
 #define CL1(a) CL0(a##0) CL0(a##1) CL0(a##2) CL0(a##3) CL0(a##4) CL0(a##5) \
 CL0(a##6) CL0(a##7) CL0(a##8) CL0(a##9)
 #define CL2(a) CL1(a##0) CL1(a##1) CL1(a##2) CL1(a##3) CL1(a##4) CL1(a##5) \
 CL1(a##6) CL1(a##7) CL1(a##8) CL1(a##9)
 #define CL3(a) CL2(a##0) CL2(a##1) CL2(a##2) CL2(a##3) CL2(a##4) CL2(a##5) \
 CL2(a##6) CL2(a##7) CL2(a##8) CL2(a##9)
 #define CL4(a) CL3(a##0) CL3(a##1) CL3(a##2) CL3(a##3) CL3(a##4) CL3(a##5) \
 CL3(a##6) CL3(a##7) CL3(a##8) CL3(a##9)

 void f();

 void a() {
     int b;
  c: switch (b) {
         CL4(1)
     }
 }

This comes from GCC PR 15524


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17390 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-11-01 07:05:07 +00:00
Reid Spencer
6cb21d443e Change Library Names Not To Conflict With Others When Installed 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17286 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-27 23:18:45 +00:00
Chris Lattner
1fca5ff62b Convert 'struct' to 'class' in various places to adhere to the coding standards 
and work better with VC++.  Patch contributed by Morten Ofstad!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17281 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-27 16:14:51 +00:00
Chris Lattner
dc78122242 Hrm, this code was severely botched. As it turns out, this patch: 
http://mail.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20041018/019708.html

exposed ANOTHER latent bug in this xform, which caused Prolangs-C/bison to fill
the zion nightly tester disk up and make the tester barf.

This is obviously not a good thing, so lets fix this bug shall we? :)


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17276 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-27 05:57:15 +00:00
Chris Lattner
2f48686307 Initialize with the correct constant type 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17270 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-27 03:55:24 +00:00
Chris Lattner
13a166525c Fix compatibility with MSVC, patch by Morten Ofstad 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17218 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-25 18:45:16 +00:00
Chris Lattner
9b9918246c Fix a bug Nate noticed, where we miscompiled a simple testcase 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17157 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-22 04:53:16 +00:00
Reid Spencer
cac731ecbe We won't use automake 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17155 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-22 03:35:04 +00:00
Chris Lattner
3fd0e55de1 Hrm, some people complain when the compiler cheerfully tells them what it's 
doing... I guess they're right.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17142 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-19 06:33:16 +00:00
Reid Spencer
86d341b204 Initial automake generated Makefile template 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17136 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-18 23:55:41 +00:00
Nate Begeman
eaa13851a7 Initial implementation of the strength reduction for GEP instructions in 
loops.  This optimization is not turned on by default yet, but may be run
with the opt tool's -loop-reduce flag.  There are many FIXMEs listed in the
code that will make it far more applicable to a wide range of code, but you
have to start somewhere :)

This limited version currently triggers on the following tests in the
MultiSource directory:
pcompress2: 7 times
cfrac: 5 times
anagram: 2 times
ks: 6 times
yacr2: 2 times


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17134 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-18 21:08:22 +00:00
Reid Spencer
17e6e44298 Correction to allow compilation with Visual C++. 
Patch contributed by Morten Ofstad. Thanks Morten!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17123 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-18 14:38:48 +00:00
Chris Lattner
fc5c1bb000 Turn store -> null/undef into the LLVM unreachable instruction! This simple 
change hacks off 10K of bytecode from perlbmk (.5%) even though the front-end
is not generating them yet and we are not optimizing the resultant code.
This isn't too bad.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17111 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-18 03:00:50 +00:00
Chris Lattner
17be63552a Turn things with obviously undefined semantics into 'store -> null' 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17110 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-18 02:59:09 +00:00
Chris Lattner
77bcee74da My friend the invoke instruction does not dominate all basic blocks if it 
occurs in the entry node of a function


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17109 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-18 01:48:31 +00:00
Chris Lattner
c7ff6c8029 Getting ADCE to interact well with unreachable instructions seems like a nontrivial 
exercise that I'm not interested in tackling right now.  Just punt and treat them
like unwind's.

This 'fixes' test/Regression/Transforms/ADCE/unreachable-function.ll


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17106 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-17 23:45:06 +00:00
Chris Lattner
ca45930548 Remove printout, realize that instructions in the entry block dominate all 
other blocks.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17099 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-17 21:31:34 +00:00
Chris Lattner
c30bda7540 hasConstantValue will soon return instructions that don't dominate the PHI node, 
so prepare for this.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17095 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-17 21:22:38 +00:00
Chris Lattner
79a564caa7 Fix a type violation 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17069 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-16 23:28:04 +00:00
Chris Lattner
6e758aee74 Kill the bogon that slipped into my buffer before I committed. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17067 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-16 19:46:33 +00:00
Chris Lattner
061718cba8 Implement InstCombine/getelementptr.ll:test9, which is the source of many 
ugly and giant constnat exprs in some programs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17066 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-16 19:44:59 +00:00
Chris Lattner
e87597fb75 Optimize instructions involving undef values. For example X+undef == undef. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17047 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-16 18:11:37 +00:00
Chris Lattner
5d356a7c82 Handle undef values as undefined on the constant lattice 
ignore unreachable instructions


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17044 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-16 18:09:41 +00:00
Chris Lattner
b2f59a2af7 Add note 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@17043 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-16 18:09:25 +00:00
Reid Spencer
d96cb6eaa0 Update to reflect changes in Makefile rules. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16950 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-13 11:46:52 +00:00
Chris Lattner
35b9e48cfd Transform memmove -> memcpy when the source is obviously constant memory. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16932 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-12 04:52:52 +00:00
Chris Lattner
989cbd58fb Fix a REALLY obscure bug in my previous checkin, which was splicing the END 
marker from one ilist into the middle of another basic block!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16925 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-12 01:02:29 +00:00
Chris Lattner
a4b9c7841f Handle a common case more carefully. In particular, instead of transforming 
pointer recurrences into expressions from this:

  %P_addr.0.i.0 = phi sbyte* [ getelementptr ([8 x sbyte]* %.str_1, int 0, int 0), %entry ], [ %inc.0.i, %no_exit.i ]
  %inc.0.i = getelementptr sbyte* %P_addr.0.i.0, int 1            ; <sbyte*> [#uses=2]

into this:

  %inc.0.i = getelementptr sbyte* getelementptr ([8 x sbyte]* %.str_1, int 0, int 0), int %inc.0.i.rec

Actually create something nice, like this:

  %inc.0.i = getelementptr [8 x sbyte]* %.str_1, int 0, int %inc.0.i.rec


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16924 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-11 23:06:50 +00:00
Chris Lattner
6a9fdfaec8 Reenable the transform, turning X/-10 < 1 into X > -10 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16918 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-11 19:40:04 +00:00
Reid Spencer
81f76b324e Initial version of automake Makefile.am file. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16893 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-10 22:20:40 +00:00
Chris Lattner
dd27827733 Use DEBUG instead of DebugFlag directly, as DebugFlag does not respect 
-debug-only!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16868 91177308-0d34-0410-b5e6-96231b3b80d8
 2004-10-09 19:30:36 +00:00