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349 Commits

Author SHA1 Message Date
Chris Lattner d78ebd0c6b Fix bug: TailDup/2003-07-22-InfiniteLoop.ll 
llvm-svn: 7243
 2003-07-23 03:32:41 +00:00
Chris Lattner bdb0ce0605 - InstCombine (cast (xor A, B) to bool) ==> (setne A, B) 
- InstCombine (cast (and X, (1 << size(X)-1)) to bool) ==> x < 0

llvm-svn: 7241
 2003-07-22 21:46:59 +00:00
John Criswell d6dcbc6ce8 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.

llvm-svn: 7216
 2003-07-21 19:42:57 +00:00
John Criswell 0643ceafcf 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.

llvm-svn: 7193
 2003-07-17 19:06:55 +00:00
Chris Lattner 0f1d8a3947 Add support for elimination of load instruction from global constants 
llvm-svn: 6912
 2003-06-26 05:06:25 +00:00
Chris Lattner 35236d8477 Instcombine: X * -1 -> -X 
llvm-svn: 6904
 2003-06-25 17:09:20 +00:00
Chris Lattner b396afde26 Fix bug: Mem2Reg/2003-06-26-IterativePromote.ll 
llvm-svn: 6901
 2003-06-25 14:58:56 +00:00
Chris Lattner ee967711e9 Fix bug: ADCE/2003-06-24-BadSuccessor.ll 
llvm-svn: 6891
 2003-06-24 23:02:45 +00:00
Chris Lattner 834105502d Do not mark ALL terminators live if any instruciton in the block is live. We only 
want to mark it live if it is an unconditional branch.  This fixes bug:
ADCE/2002-05-28-Crash.ll and makes this pass _much_ more useful.

llvm-svn: 6887
 2003-06-24 21:49:45 +00:00
Chris Lattner 7e270580c8 Fix bug: SCCP/2003-06-24-OverdefinedPHIValue.ll 
llvm-svn: 6883
 2003-06-24 20:29:52 +00:00
Chris Lattner f7544873de Fix bug: TailDup/2003-06-24-Simpleloop.ll 
llvm-svn: 6881
 2003-06-24 19:48:06 +00:00
Chris Lattner 55d4bda861 Implement new transforms: 
Replace (cast (sub A, B) to bool) -> (setne A, B)
  Replace (cast (add A, B) to bool) -> (setne A, -B)

llvm-svn: 6873
 2003-06-23 21:59:52 +00:00
Chris Lattner 92963de6fa Add paranoia checking 
llvm-svn: 6856
 2003-06-22 20:46:00 +00:00
Chris Lattner 268c1392da Test change 
llvm-svn: 6852
 2003-06-22 20:25:27 +00:00
Chris Lattner a5434caa5c Initial checkin of Tail duplication pass. 
llvm-svn: 6846
 2003-06-22 20:10:28 +00:00
Chris Lattner d0d51605b2 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.

llvm-svn: 6837
 2003-06-21 23:12:02 +00:00
Chris Lattner 970c33abb1 Implement the functionality of InstCombine/call.ll 
llvm-svn: 6783
 2003-06-19 17:00:31 +00:00
Chris Lattner 2a8c301c9f Don't corrupt memory when removing an instruction from the program, but 
not the worklist

llvm-svn: 6733
 2003-06-17 03:57:18 +00:00
Chris Lattner dc62f1e021 Fix bug: ADCE/2003-06-11-InvalidCFG.ll 
This was because we were deleting large chunks of functions without an exit block, because the post-dominance
information was not useful.  This broke crafty and twolf.

llvm-svn: 6698
 2003-06-16 12:10:45 +00:00
Chris Lattner 45789aca97 Fix bug: InstCombine/2003-06-05-BranchInvertInfLoop.ll 
llvm-svn: 6630
 2003-06-05 20:12:51 +00:00
Chris Lattner e967b348bf Clean up previous code. 
Add new combination to turn seteq X, 0 -> not(cast X to bool)

llvm-svn: 6604
 2003-06-04 05:10:11 +00:00
Chris Lattner 9eef8a78b4 Implement combination of boolean not with branch 
llvm-svn: 6599
 2003-06-04 04:46:00 +00:00
Chris Lattner 791ac1a4c8 Implement xform: (X != 0) -> (bool)X 
llvm-svn: 6506
 2003-06-01 03:35:25 +00:00
Chris Lattner 0078d9c5bb Okay totally give up on trying to optimize aggregates that cannot be completely 
broken up into their elements.  Too many programs break because of this.

llvm-svn: 6440
 2003-05-30 19:22:14 +00:00
Chris Lattner d847be0539 add a check that allows the SRoA pass to avoid breaking programs, even if their 
behavior is technically undefined

llvm-svn: 6438
 2003-05-30 18:09:57 +00:00
Chris Lattner 38d88c07f4 Fix bug: ScalarRepl/2003-05-30-MultiLevel.ll 
llvm-svn: 6428
 2003-05-30 05:26:30 +00:00
Chris Lattner 6e5398d69d Fix bug: ScalarRepl/2003-05-29-ArrayFail.ll 
llvm-svn: 6425
 2003-05-30 04:15:41 +00:00
Chris Lattner 6c81ebc97d Add comment 
llvm-svn: 6415
 2003-05-29 20:26:30 +00:00
Chris Lattner 3442844742 Fix bug: Instcombine/2003-05-27-ConstExprCrash.ll 
llvm-svn: 6352
 2003-05-27 16:40:51 +00:00
Chris Lattner c16b210349 * Actually USE the statistic that we made 
* Implement SRoA for arrays

llvm-svn: 6349
 2003-05-27 16:09:27 +00:00
Chris Lattner fb41a50d15 Implementation of the simple "scalar replacement of aggregates" transformation 
llvm-svn: 6346
 2003-05-27 15:45:27 +00:00
Chris Lattner 196897c424 Fix bug: InstCombine/2003-05-26-CastMiscompile.ll 
llvm-svn: 6338
 2003-05-26 23:41:32 +00:00
Chris Lattner 8d0a71aff8 Remove using declarations 
llvm-svn: 6306
 2003-05-22 22:00:07 +00:00
Chris Lattner 471bd76281 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.

llvm-svn: 6286
 2003-05-22 19:07:21 +00:00
Misha Brukman 373086db75 Hopefully, the final fix for `[Pp]ropogate'. 
llvm-svn: 6251
 2003-05-20 21:01:22 +00:00
Misha Brukman e5838c4d72 s/convertable/convertible/g 
llvm-svn: 6248
 2003-05-20 18:45:36 +00:00
Chris Lattner 652e7bf8a8 Fix long standing bug 
llvm-svn: 6232
 2003-05-15 18:25:13 +00:00
Chris Lattner 0895025b30 Fix bug: LoopPreheaders/2003-05-12-PreheaderExitOfChild.ll 
llvm-svn: 6153
 2003-05-12 22:04:34 +00:00
Chris Lattner b02697210e Handle va_arg instruction correctly 
llvm-svn: 6030
 2003-05-08 02:50:13 +00:00
Chris Lattner 3666378690 Fix spelling 
llvm-svn: 5983
 2003-05-02 19:26:34 +00:00
Chris Lattner df7cc91159 Fix Bug: LowerSwitch/2003-05-01-PHIProblem.ll 
llvm-svn: 5979
 2003-05-01 22:21:21 +00:00
Chris Lattner dd65d863a9 Fix another case where constexprs could cause a crash 
llvm-svn: 5972
 2003-04-30 22:34:06 +00:00
Chris Lattner 9244df60d3 Fix constant folding of constexprs 
llvm-svn: 5971
 2003-04-30 22:19:10 +00:00
Chris Lattner b68a34eb3f Fix bug: ADCE/2003-04-25-PHIPostDominateProblem.ll 
llvm-svn: 5952
 2003-04-25 22:53:27 +00:00
Chris Lattner 3c98276168 Fix major problem with PHI node traversal: rechecking PHIs should go into 
the visit function.  The worklist is for when their lattice value changes.

llvm-svn: 5927
 2003-04-25 03:35:10 +00:00
Chris Lattner cccc5c76c8 Minor non-functional changes: 
* Spell propagate right
  * Improve performance of phi node handling
  * Delete using directive
  * Other minor changes

llvm-svn: 5920
 2003-04-25 02:50:03 +00:00
Chris Lattner 889f620841 Remove unnecesary &*'s 
llvm-svn: 5872
 2003-04-23 16:37:45 +00:00
Chris Lattner 1b094a0f2e New pass to lower switch instructions to branch instructions 
llvm-svn: 5865
 2003-04-23 16:23:59 +00:00
Chris Lattner 1f45f4e4d8 Minor cleanups 
llvm-svn: 5863
 2003-04-23 16:18:14 +00:00
Chris Lattner 46b3d30bf6 Change the interface to constant expressions to allow automatic folding 
llvm-svn: 5793
 2003-04-16 22:40:51 +00:00