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70 Commits

Author SHA1 Message Date
Devang Patel
d48bbbf07b Keep track of exit value operand number when operands are swapped. 
llvm-svn: 47082
 2008-02-13 19:48:48 +00:00
Devang Patel
9aba178666 Fix PR 1995. 
llvm-svn: 46898
 2008-02-08 22:49:13 +00:00
Devang Patel
86ff705c22 Filter loops that subtract induction variables. 
These loops are not yet handled.

Fix PR 1912.

llvm-svn: 46484
 2008-01-29 02:20:41 +00:00
Chris Lattner
ad9a6ccb83 Remove attribution from file headers, per discussion on llvmdev. 
llvm-svn: 45418
 2007-12-29 20:36:04 +00:00
Devang Patel
c47f68e747 If ExitValue operand is also defined in Loop header then 
insert new ExitValue after this operand definition.

This fixes PR1828.

llvm-svn: 44539
 2007-12-03 19:17:21 +00:00
Devang Patel
d98abb62ce Handle multiple induction variables. 
This fixes PR714.

llvm-svn: 42309
 2007-09-25 18:24:48 +00:00
Devang Patel
f35e6c1181 doh.. 
llvm-svn: 42300
 2007-09-25 17:43:08 +00:00
Devang Patel
de9d1c3654 Add transformation to update loop interation space. Now, 
for (i=A; i<N; i++) {
  if (i < X && i > Y)
    do_something();
}

is transformed into

U=min(N,X); L=max(A,Y);
for (i=L;i<U;i++)
  do_somethihg();                            

llvm-svn: 42299
 2007-09-25 17:31:19 +00:00
Devang Patel
b741c56cfc Fix PR1692 
llvm-svn: 42209
 2007-09-21 21:18:19 +00:00
Devang Patel
57b0b31257 Don't increment invalid iterator. 
llvm-svn: 42178
 2007-09-20 23:01:50 +00:00
Devang Patel
339bee9291 Relax loop ExitCondition predicate restriction. 
llvm-svn: 42122
 2007-09-19 00:28:47 +00:00
Devang Patel
2883f5cc94 Filter loops where split condition's false branch is not empty. For example 
for (int i = 0; i < N; ++i) {
  if (i == somevalue)
    dosomething();
   else
    dosomethingelse();
}

llvm-svn: 42121
 2007-09-19 00:15:16 +00:00
Devang Patel
03df2adc31 Bail out early, before modifying anything. 
llvm-svn: 42120
 2007-09-19 00:11:01 +00:00
Devang Patel
9806df698b Work is incomplete. Loop is not modified at all right now. 
llvm-svn: 42119
 2007-09-19 00:08:13 +00:00
Devang Patel
578a1ae12a Do not eliminate loop when it is invalid to do so. For example, 
for(int i = 0; i < N; i++) {
	if ( i == XYZ) {
		A;
	else
		B;
	}
	C;
	D;
}

llvm-svn: 42058
 2007-09-17 21:01:05 +00:00
Devang Patel
14b9a01c02 Skeleton for transformations to truncate loop's iteration space. 
llvm-svn: 42054
 2007-09-17 20:39:48 +00:00
Bill Wendling
843ac5aebe Temporary reverting r41817 
(http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20070910/053370.html). It's
causing SPASS to fail.

llvm-svn: 41938
 2007-09-14 01:13:55 +00:00
Devang Patel
8f8fe2f0da Avoid negative logic. 
llvm-svn: 41829
 2007-09-11 01:10:45 +00:00
Devang Patel
9bc265b94a Refactor code into a separate method. 
llvm-svn: 41826
 2007-09-11 00:42:56 +00:00
Devang Patel
49ffe783eb Clear split info object. 
llvm-svn: 41823
 2007-09-11 00:23:56 +00:00
Devang Patel
8394964f1a Split condition does not have to be ICmpInst in all cases. 
llvm-svn: 41822
 2007-09-11 00:12:56 +00:00
Devang Patel
82374f7476 Check all terminators inside loop. 
llvm-svn: 41821
 2007-09-10 23:57:58 +00:00
Devang Patel
ce76c29be0 Swap exit condition operands if it works. 
llvm-svn: 41817
 2007-09-10 23:34:06 +00:00
Devang Patel
76790c1b28 Filter exit conditions which are not yet handled. 
llvm-svn: 41800
 2007-09-10 18:33:42 +00:00
Devang Patel
c649f24384 Use simpler test to filter loops. 
llvm-svn: 41516
 2007-08-27 21:34:31 +00:00
Devang Patel
cbfa564c1c Move exit condition and exit branch from exiting block into loop header and dominator info. This avoid execution of dead iteration. Loop is already filter in the beginning such that this change is safe. 
llvm-svn: 41394
 2007-08-25 02:39:24 +00:00
Devang Patel
d961a55c5a Constant split values needs upper bound and lower bound check, just like any other split value. 
llvm-svn: 41389
 2007-08-25 01:09:14 +00:00
Devang Patel
027410a7aa While calculating upper loop bound for first loop and lower loop bound for second loop, take care of edge cases. 
llvm-svn: 41387
 2007-08-25 00:56:38 +00:00
Devang Patel
c46dc61548 Fix regression that I caused yesterday night while adding logic to select appropriate split condition branch. 
llvm-svn: 41365
 2007-08-24 19:32:26 +00:00
Devang Patel
0b351a64db It is not safe to execute split condition's true branch first all the time. If split 
condition predicate is GT or GE then execute false branch first.

llvm-svn: 41358
 2007-08-24 06:17:19 +00:00
Devang Patel
59af13f0cf Reject ICMP_NE as index split condition. 
llvm-svn: 41357
 2007-08-24 06:02:25 +00:00
Devang Patel
4b52632179 Tightenup loop filter. 
llvm-svn: 41356
 2007-08-24 05:36:56 +00:00
Devang Patel
8b1d0a1ad2 Remove incomplete cost analysis. 
llvm-svn: 41354
 2007-08-24 05:21:13 +00:00
Devang Patel
4ad7c57729 Remove dead code. 
llvm-svn: 41295
 2007-08-22 21:07:41 +00:00
Devang Patel
798ba45c39 Fix typo. 
llvm-svn: 41292
 2007-08-22 20:55:18 +00:00
Devang Patel
59b8967a74 Cosmetic change 
"True Loop" and "False Loop" naming terminology to refer two loops
after loop cloning is confusing. Instead just use A_Loop and B_Loop.

llvm-svn: 41287
 2007-08-22 19:33:29 +00:00
Devang Patel
797fbef078 Refactor loop condition check in a separate function. 
llvm-svn: 41282
 2007-08-22 18:27:01 +00:00
Devang Patel
7e6f9f4779 Fix thinko. 
Starting value of second loop's induction variable can not be lower 
then starting value of original loop's induction variable.

llvm-svn: 41280
 2007-08-22 18:07:47 +00:00
Devang Patel
60f5256cd1 Rename bunch of variables. 
llvm-svn: 41250
 2007-08-21 21:12:02 +00:00
Devang Patel
4fe5509c7d Preserve LCSSA. 
llvm-svn: 41246
 2007-08-21 19:47:46 +00:00
Devang Patel
b64f73f8f0 s/ExitBlock/ExitingBlock/g 
llvm-svn: 41204
 2007-08-20 23:51:18 +00:00
Devang Patel
b6ebf8cbf3 Replace indunction variable with split value in loop body. 
This fixes art miscompile.

llvm-svn: 41195
 2007-08-20 20:49:01 +00:00
Devang Patel
6c91023dad Do not split loops rejected by processOneIterationLoop(). 
llvm-svn: 41194
 2007-08-20 20:24:15 +00:00
Devang Patel
17cd20c077 Avoid spliting loops where two split condition branches are not independent. 
llvm-svn: 41148
 2007-08-18 00:00:32 +00:00
Devang Patel
fded73828f When one branch of condition is eliminated then head of the other 
branch is not necessary immediate dominators of merge blcok in all cases.

llvm-svn: 41144
 2007-08-17 21:59:16 +00:00
Devang Patel
423d18e306 Dominance frontier is now required. 
llvm-svn: 41096
 2007-08-15 03:34:53 +00:00
Devang Patel
315ea9c519 Cleanup removeBlocks. 
Use dominance frontier to fixup incoming edges of successor blocks not domianted by DeadBB.
Use df_iterator to walk and delete basic blocks dominated by DeadBB.

llvm-svn: 41095
 2007-08-15 03:31:47 +00:00
Reid Spencer
2cfe29fc0b Remove unneeded header file. 
llvm-svn: 41094
 2007-08-15 03:01:04 +00:00
Devang Patel
b0924a406a Avoid triangle loops. 
llvm-svn: 41093
 2007-08-15 02:14:55 +00:00
Devang Patel
d39b9d41bb Avoid nested loops at the moment. 
llvm-svn: 41090
 2007-08-14 23:53:57 +00:00