de46e48420
For PR786:
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Turn on -Wunused and -Wno-unused-parameter. Clean up most of the resulting
fall out by removing unused variables. Remaining warnings have to do with
unused functions (I didn't want to delete code without review) and unused
variables in generated code. Maintainers should clean up the remaining
issues when they see them. All changes pass DejaGnu tests and Olden.
llvm-svn: 31380
2006-11-02 20:25:50 +00:00
6ab03f6a08
Eliminate ConstantBool::True and ConstantBool::False. Instead, provide
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ConstantBool::getTrue() and ConstantBool::getFalse().
llvm-svn: 30665
2006-09-28 23:35:22 +00:00
f489d0f85c
Do not rely on std::sort and std::erase to get list of unique
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exit blocks. The output is dependent on addresses of basic block.
Add and use Loop::getUniqueExitBlocks.
llvm-svn: 29966
2006-08-29 22:29:16 +00:00
c2d3d3112e
eliminate RegisterOpt. It does the same thing as RegisterPass.
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llvm-svn: 29925
2006-08-27 22:42:52 +00:00
00b974cdbc
Fix a error that hadn't yet cause any problems, but I'm sure it would have
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somewhere down the road.
llvm-svn: 29197
2006-07-19 03:51:48 +00:00
18e816f356
Switch to a very conservative heuristic for determining when loop-unswitching
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will be profitable. This is mainly to remove some cases where excessive
unswitching would result in long compile times and/or huge generated code.
Once someone comes up with a better heuristic that avoids these cases, this
should be switched out.
llvm-svn: 28962
2006-06-28 17:47:50 +00:00
0a2e11260e
Don't unswitch really large loops even if they are mostly filled with empty
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blocks.
llvm-svn: 28959
2006-06-28 16:38:55 +00:00
bb3ae5eb8f
Fix for 2006-06-27-DeadSwitchCase.ll
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Be more careful when updating Phi nodes after eliminating dead switch cases. Fix
proposed by Chris.
llvm-svn: 28947
2006-06-27 22:26:09 +00:00
f52351e50f
Make LoopUnswitch able to unswitch loops with live-out values by taking advantage
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of LCSSA. This results several times the number of unswitchings occurring on
tests such and timberwolfmc, unix-tbl, and ldecod.
llvm-svn: 28912
2006-06-26 07:44:36 +00:00
0c4f5a655a
Fix Transforms/LoopUnswitch/2006-06-13-SingleEntryPHI.ll, a loop unswitch
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bug exposed by the recent lcssa work.
llvm-svn: 28779
2006-06-14 04:46:17 +00:00
fd0a3d6e5c
Reapply my 6/9 changes. The bug Evan saw no longer occurs.
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llvm-svn: 28759
2006-06-12 21:49:21 +00:00
1b6e310e6f
Back out Owen's 6/9 changes. They broke MultiSource/Benchmarks/Prolangs-C/bison (and perhaps others).
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llvm-svn: 28747
2006-06-11 09:32:57 +00:00
b1dc1d44f8
Add LCSSA as a requirement for LoopUnswitch, and assert that LoopUnswitch preserves
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LCSSA.
llvm-svn: 28739
2006-06-09 18:40:32 +00:00
5821a6a17a
add the actual cost to the debug info
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llvm-svn: 27051
2006-03-24 07:14:00 +00:00
e5521db5bc
Fix Regression/Transforms/LoopUnswitch/2006-02-22-UnswitchCrash.ll, which
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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
8a5a324dac
Add some comments, simplify some code, and fix a bug that caused rewriting
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to rewrite with the wrong value.
llvm-svn: 26311
2006-02-22 06:37:14 +00:00
c2e3a7a4ce
improved support for branch folding, still not enabled.
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llvm-svn: 26289
2006-02-18 07:57:38 +00:00
19fa8ac938
Implement deletion of dead blocks, currently disabled.
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llvm-svn: 26285
2006-02-18 02:42:34 +00:00
cb853de534
a previous patch completely disabled trivial unswitching, this fixees it.
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Thanks to nate for pointing this out :)
llvm-svn: 26280
2006-02-18 01:32:04 +00:00
29f771ba21
initial trivial support for folding branches that have now-constant destinations.
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llvm-svn: 26279
2006-02-18 01:27:45 +00:00
8e44ff50b0
When unswitching a loop, make sure to update loop info with exit blocks in
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the right loop.
llvm-svn: 26277
2006-02-18 00:55:32 +00:00
baddba41c7
Fix loops where the header has an exit, fixing a loop-unswitch crash on crafty
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llvm-svn: 26258
2006-02-17 06:39:56 +00:00
6fd136239b
start of some new simplification code, not thoroughly tested, use at your own
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risk :)
llvm-svn: 26248
2006-02-17 00:31:07 +00:00
fa335f6083
Change SplitBlock to increment a BasicBlock::iterator, not an Instruction*. Apparently they do different things :)
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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
55f63f1b53
Fix VC++ warning.
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llvm-svn: 26228
2006-02-16 04:07:37 +00:00
ff42e81028
fix a bug where we unswitched the wrong way
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llvm-svn: 26225
2006-02-16 01:24:41 +00:00
fdff0bb43e
Implement trivial unswitching for switch stmts. This allows us to trivial
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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
e5cb76d744
make "trivial" unswitching significantly more general. It can now handle
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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
65152d80ec
Checking the wrong value. This caused us to emit silly code like
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Y = seteq bool X, true
instead of just using X :)
llvm-svn: 26215
2006-02-15 19:05:52 +00:00
01db04efb0
more refactoring, no functionality change.
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llvm-svn: 26194
2006-02-15 01:44:42 +00:00
b0cbe7106e
pull some code out into a function
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llvm-svn: 26191
2006-02-15 00:07:43 +00:00
0b8ec1a132
Use statistics to keep track of what flavors of loops we are unswitching
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llvm-svn: 26157
2006-02-14 01:01:41 +00:00
fbadd7e1ee
implement unswitching of loops with switch stmts and selects in them
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llvm-svn: 26114
2006-02-11 00:43:37 +00:00
f1b151684d
Update PHI nodes in successors of exit blocks.
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llvm-svn: 26113
2006-02-10 23:26:14 +00:00
fe4151efe7
Reform the unswitching code in terms of edge splitting, not block splitting.
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llvm-svn: 26112
2006-02-10 23:16:39 +00:00
ec6b40a093
Fix a case where UnswitchTrivialCondition broke critical edges with
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phi's in the successors
llvm-svn: 26108
2006-02-10 19:08:15 +00:00
6e263155a6
add some notes, move some code around. Implement unswitching of loops
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with branches on partially invariant computations.
llvm-svn: 26104
2006-02-10 02:30:37 +00:00
4935417a84
Move code around to be more logical, no functionality change.
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llvm-svn: 26103
2006-02-10 02:01:22 +00:00
3fc3148b85
When unswitching a trivial loop, do admit we are doing it! :)
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llvm-svn: 26102
2006-02-10 01:36:35 +00:00
ed7a67b0de
Implement unconditional unswitching of 'trivial' loops, those loops that contain
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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
4f0e66df6a
Simplify control flow a bit, note that unswitch preserves canonical loop form
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llvm-svn: 26098
2006-02-09 22:15:42 +00:00
8976219850
Make the threshold a parameter
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llvm-svn: 26093
2006-02-09 20:15:48 +00:00
2826e0511b
Simplify the loop-unswitch pass, by not even trying to unswitch loops with
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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
c597b8a55e
Make iostream #inclusion explicit
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llvm-svn: 25514
2006-01-22 23:32:06 +00:00
b1c9317bb4
Remove trailing whitespace
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llvm-svn: 21427
2005-04-21 23:48:37 +00:00
eca0d0f2da
Put createLoopUnswitchPass() into proper namespace
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llvm-svn: 19306
2005-01-06 05:47:18 +00:00
a5c04ee50f
Fixes to make LLVM compile with vc7.1.
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Patch contributed by Paolo Invernizzi!
llvm-svn: 16152
2004-09-03 18:19:51 +00:00
7c16caa336
Changes For Bug 352
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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
f48f777d4c
Initial checkin of a simple loop unswitching pass. It still needs work,
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but it's a start, and seems to do it's basic job.
llvm-svn: 13068
2004-04-19 18:07:02 +00:00
Reid Spencer