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235 Commits

Author SHA1 Message Date
Chris Lattner
fafc1f9c51 Fix Regression/Transforms/LoopUnswitch/2006-02-22-UnswitchCrash.ll, which 
caused SPASS to fail building last night.

We can't trivially unswitch a loop if the exit block has phi nodes in it,
because we don't know which predecessor to use.

llvm-svn: 26320
 2006-02-22 23:55:00 +00:00
Chris Lattner
b539c70e07 Add some comments, simplify some code, and fix a bug that caused rewriting 
to rewrite with the wrong value.

llvm-svn: 26311
 2006-02-22 06:37:14 +00:00
Chris Lattner
4121b502d3 improved support for branch folding, still not enabled. 
llvm-svn: 26289
 2006-02-18 07:57:38 +00:00
Chris Lattner
71d62c944d Implement deletion of dead blocks, currently disabled. 
llvm-svn: 26285
 2006-02-18 02:42:34 +00:00
Chris Lattner
5f12d7c418 a previous patch completely disabled trivial unswitching, this fixees it. 
Thanks to nate for pointing this out :)

llvm-svn: 26280
 2006-02-18 01:32:04 +00:00
Chris Lattner
359476b89f initial trivial support for folding branches that have now-constant destinations. 
llvm-svn: 26279
 2006-02-18 01:27:45 +00:00
Chris Lattner
39356756ac When unswitching a loop, make sure to update loop info with exit blocks in 
the right loop.

llvm-svn: 26277
 2006-02-18 00:55:32 +00:00
Chris Lattner
d5a4da466a Fix loops where the header has an exit, fixing a loop-unswitch crash on crafty 
llvm-svn: 26258
 2006-02-17 06:39:56 +00:00
Chris Lattner
e2286db8d8 start of some new simplification code, not thoroughly tested, use at your own 
risk :)

llvm-svn: 26248
 2006-02-17 00:31:07 +00:00
Chris Lattner
847c7ca438 Change SplitBlock to increment a BasicBlock::iterator, not an Instruction*. Apparently they do different things :) 
This fixes a testcase that nate reduced from spass.

Also included are a couple minor code changes that don't affect the generated
code at all.

llvm-svn: 26235
 2006-02-16 19:36:22 +00:00
Jeff Cohen
381e19a745 Fix VC++ warning. 
llvm-svn: 26228
 2006-02-16 04:07:37 +00:00
Chris Lattner
57142c7e12 fix a bug where we unswitched the wrong way 
llvm-svn: 26225
 2006-02-16 01:24:41 +00:00
Chris Lattner
0a6283e1c2 Implement trivial unswitching for switch stmts. This allows us to trivial 
unswitch this loop on 2 before sweating to unswitch on 1/3.

void test4(int N, int i, int C, int*P, int*Q) {
  int j;
  for (j = 0; j < N; ++j) {
    switch (C) {                // general unswitching.
    default: P[i+j] = 0; break;
    case 1: Q[i+j] = 0; break;
    case 3: P[i+j] = Q[i+j]; break;
    case 2: break;              //  TRIVIAL UNSWITCH on C==2
    }
  }
}

llvm-svn: 26223
 2006-02-15 22:52:05 +00:00
Chris Lattner
4b996ebd5e make "trivial" unswitching significantly more general. It can now handle 
this for example:

  for (j = 0; j < N; ++j) {     // trivial unswitch
    if (C)
      P[i+j] = 0;
  }

turning it into the obvious code without bothering to duplicate an empty loop.

llvm-svn: 26220
 2006-02-15 22:03:36 +00:00
Chris Lattner
9268890212 Checking the wrong value. This caused us to emit silly code like 
Y = seteq bool X, true
instead of just using X :)

llvm-svn: 26215
 2006-02-15 19:05:52 +00:00
Chris Lattner
a71a9897e0 more refactoring, no functionality change. 
llvm-svn: 26194
 2006-02-15 01:44:42 +00:00
Chris Lattner
456e164ccb pull some code out into a function 
llvm-svn: 26191
 2006-02-15 00:07:43 +00:00
Chris Lattner
33fd4611f5 Use statistics to keep track of what flavors of loops we are unswitching 
llvm-svn: 26157
 2006-02-14 01:01:41 +00:00
Chris Lattner
f7cf05d3a2 implement unswitching of loops with switch stmts and selects in them 
llvm-svn: 26114
 2006-02-11 00:43:37 +00:00
Chris Lattner
ec24272c6f Update PHI nodes in successors of exit blocks. 
llvm-svn: 26113
 2006-02-10 23:26:14 +00:00
Chris Lattner
672c45a3c0 Reform the unswitching code in terms of edge splitting, not block splitting. 
llvm-svn: 26112
 2006-02-10 23:16:39 +00:00
Chris Lattner
ada27b9dba Fix a case where UnswitchTrivialCondition broke critical edges with 
phi's in the successors

llvm-svn: 26108
 2006-02-10 19:08:15 +00:00
Chris Lattner
8d28872523 add some notes, move some code around. Implement unswitching of loops 
with branches on partially invariant computations.

llvm-svn: 26104
 2006-02-10 02:30:37 +00:00
Chris Lattner
e51f996026 Move code around to be more logical, no functionality change. 
llvm-svn: 26103
 2006-02-10 02:01:22 +00:00
Chris Lattner
4432cd73f2 When unswitching a trivial loop, do admit we are doing it! :) 
llvm-svn: 26102
 2006-02-10 01:36:35 +00:00
Chris Lattner
eef362d63e Implement unconditional unswitching of 'trivial' loops, those loops that contain 
branches in their entry block that control whether or not the loop is a noop or not.

llvm-svn: 26101
 2006-02-10 01:24:09 +00:00
Chris Lattner
602fc20596 Simplify control flow a bit, note that unswitch preserves canonical loop form 
llvm-svn: 26098
 2006-02-09 22:15:42 +00:00
Chris Lattner
19acace8c0 Make the threshold a parameter 
llvm-svn: 26093
 2006-02-09 20:15:48 +00:00
Chris Lattner
4ae405113a Simplify the loop-unswitch pass, by not even trying to unswitch loops with 
uses of loop values outside the loop.  We need loop-closed SSA form to do
this right, or to use SSA rewriting if we really care.

llvm-svn: 26089
 2006-02-09 19:14:52 +00:00
Chris Lattner
2588f0eb8f Make iostream #inclusion explicit 
llvm-svn: 25514
 2006-01-22 23:32:06 +00:00
Misha Brukman
53e199440e Remove trailing whitespace 
llvm-svn: 21427
 2005-04-21 23:48:37 +00:00
Jeff Cohen
67f737e5d1 Put createLoopUnswitchPass() into proper namespace 
llvm-svn: 19306
 2005-01-06 05:47:18 +00:00
Alkis Evlogimenos
0c50e0f211 Fixes to make LLVM compile with vc7.1. 
Patch contributed by Paolo Invernizzi!

llvm-svn: 16152
 2004-09-03 18:19:51 +00:00
Reid Spencer
c4abcbefb1 Changes For Bug 352 
Move include/Config and include/Support into include/llvm/Config,
include/llvm/ADT and include/llvm/Support. From here on out, all LLVM
public header files must be under include/llvm/.

llvm-svn: 16137
 2004-09-01 22:55:40 +00:00
Chris Lattner
29f69938e7 Initial checkin of a simple loop unswitching pass. It still needs work, 
but it's a start, and seems to do it's basic job.

llvm-svn: 13068
 2004-04-19 18:07:02 +00:00