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1684 Commits

Author SHA1 Message Date
Devang Patel
9249a85cdc Use IRBuilder while folding two entry PHINode. 
llvm-svn: 131548
 2011-05-18 18:16:44 +00:00
Devang Patel
6eb1a7bd09 Set up IRBuilder for use during simplification. 
llvm-svn: 131545
 2011-05-18 18:01:27 +00:00
Matt Beaumont-Gay
7472bb0a7e fix typo 
llvm-svn: 131543
 2011-05-18 17:37:10 +00:00
Devang Patel
a6e4c7a441 Use IRBuiler while constant folding terminator. 
llvm-svn: 131541
 2011-05-18 17:26:46 +00:00
Devang Patel
b75e746499 Preseve line numbers while simplifying CFG. 
llvm-svn: 131508
 2011-05-17 23:29:05 +00:00
Devang Patel
8a2b06e577 Preserve line number information. 
llvm-svn: 131480
 2011-05-17 19:43:06 +00:00
Devang Patel
8cf3c94ae5 There is no need to force DebugLoc on a PHI at this point. 
llvm-svn: 131427
 2011-05-16 22:05:03 +00:00
Devang Patel
9f871794b6 Preserve debug info for unused zero extended boolean argument. 
Radar 9422775.

llvm-svn: 131422
 2011-05-16 21:24:05 +00:00
Benjamin Kramer
5943d0a3ee SimplifyCFG: Use ComputeMaskedBits to prune dead cases from switch instructions. 
llvm-svn: 131345
 2011-05-14 15:57:25 +00:00
Devang Patel
236dc68956 Set debug location for new PHI nodes created in exit block. 
llvm-svn: 130894
 2011-05-04 23:58:22 +00:00
Devang Patel
4127ad57df Scanning entire basic block may be too expensive in terms of compile time. Instead, just use whatever location info first non-phi instruction has. 
llvm-svn: 130729
 2011-05-02 21:57:00 +00:00
Devang Patel
60fb94e8bf Assing line number info to new PHIs created by SSA updater. 
llvm-svn: 130551
 2011-04-29 22:28:59 +00:00
Peter Collingbourne
d78bf257ad SimplifyCFG: Expose phi node folding cost threshold as command line parameter 
llvm-svn: 130528
 2011-04-29 18:47:38 +00:00
Peter Collingbourne
0994e869f9 SimplifyCFG: Add CostRemaining parameter to DominatesMergePoint 
llvm-svn: 130527
 2011-04-29 18:47:31 +00:00
Peter Collingbourne
06646aa091 SimplifyCFG: Add Trunc, ZExt and SExt to the list of cheap instructions for phi node folding 
llvm-svn: 130526
 2011-04-29 18:47:25 +00:00
Devang Patel
5e9ca7876e Remove DbgDeclare only if all uses are converted. 
llvm-svn: 130431
 2011-04-28 20:32:02 +00:00
Jay Foad
c146569beb Remove unused STL header includes. 
llvm-svn: 130068
 2011-04-23 19:53:52 +00:00
Jay Foad
32fce4d563 PR9214: Convert Metadata API to use ArrayRef. 
llvm-svn: 129932
 2011-04-21 19:59:31 +00:00
Jay Foad
0dcd432074 Trivial simplification. 
llvm-svn: 129759
 2011-04-19 15:23:29 +00:00
Chris Lattner
0304b82f80 Fix a ton of comment typos found by codespell. Patch by 
Luis Felipe Strano Moraes!

llvm-svn: 129558
 2011-04-15 05:18:47 +00:00
Chris Lattner
88e2acc24c rework FoldBranchToCommonDest to exit earlier when there is a bonus 
instruction around, reducing work.

Greatly simplify handling of debug instructions.  There is no need to
build up a vector of them and then move them into the one predecessor
if we're processing a block.  Instead just rescan the block and *copy*
them into the pred.  If a block gets merged into multiple preds, this
will retain more debug info.

llvm-svn: 129502
 2011-04-14 02:44:53 +00:00
Chris Lattner
2871dd44cb comment cleanup, use moveBefore instead of removeFromParent+insertBefore. 
llvm-svn: 129319
 2011-04-11 23:24:57 +00:00
Jay Foad
0d5ca4cf44 Don't include Operator.h from InstrTypes.h. 
llvm-svn: 129271
 2011-04-11 09:35:34 +00:00
Devang Patel
47e1db49c9 Do not let debug info interfer with branch folding. 
llvm-svn: 129114
 2011-04-07 23:11:25 +00:00
Devang Patel
17670a995c While hoisting common code from if/else, hoist debug info intrinsics if they match. 
llvm-svn: 129078
 2011-04-07 17:27:36 +00:00
Devang Patel
bb234bb5dd Simplify. isIdenticalToWhenDefined() checks opcode. 
llvm-svn: 129041
 2011-04-07 00:30:15 +00:00
Devang Patel
12a95842b2 While folding branch to a common destination into a predecessor, copy dbg values also. 
llvm-svn: 129035
 2011-04-06 22:37:20 +00:00
Eli Friedman
f739e21880 Attempt to fix breakage from r128782 reported by Francois Pichet on 
llvm-commits.  (Not sure why it only breaks on Windows; maybe it has
something to do with the iterator representation...)

llvm-svn: 128802
 2011-04-04 00:37:38 +00:00
Eli Friedman
8b6d220330 PR9446: RecursivelyDeleteTriviallyDeadInstructions can delete the instruction 
after the given instruction; make sure to handle that case correctly.
(It's difficult to trigger; the included testcase involves a dead 
block, but I don't think that's a requirement.) 

While I'm here, get rid of the unnecessary warning about
SimplifyInstructionsInBlock, since it should work correctly as far as I know.

llvm-svn: 128782
 2011-04-02 22:45:17 +00:00
Jay Foad
53632b7c03 Remove PHINode::reserveOperandSpace(). Instead, add a parameter to 
PHINode::Create() giving the (known or expected) number of operands.

llvm-svn: 128537
 2011-03-30 11:28:46 +00:00
Jay Foad
dc5a008237 (Almost) always call reserveOperandSpace() on newly created PHINodes. 
llvm-svn: 128535
 2011-03-30 11:19:20 +00:00
Devang Patel
05641a9b85 Simplify. 
llvm-svn: 128030
 2011-03-21 22:04:45 +00:00
Devang Patel
c8b77563dc If an AllocaInst referred by DbgDeclareInst is used by a LoadInst then the LoadInst should also get a corresponding llvm.dbg.value intrinsic. 
llvm-svn: 127924
 2011-03-18 23:45:43 +00:00
Devang Patel
a5de669faa Remove dead code. 
llvm-svn: 127923
 2011-03-18 23:33:58 +00:00
Devang Patel
bafc4fec54 Consider debug info intrinsics pointing to null value as dead instructions. 
llvm-svn: 127922
 2011-03-18 23:28:02 +00:00
Devang Patel
f8c3eb7368 Try to not lose variable's debug info during instcombine. 
This is done by lowering dbg.declare intrinsic into dbg.value intrinsic.
Radar 9143931.

llvm-svn: 127834
 2011-03-17 22:18:16 +00:00
Devang Patel
3506f02e33 Refactor into a separate utility function. 
llvm-svn: 127832
 2011-03-17 21:58:19 +00:00
Cameron Zwarich
333ed540e7 Clean up something noticed by Fritz. 
llvm-svn: 127684
 2011-03-15 18:42:33 +00:00
Cameron Zwarich
7947e73536 Do not add PHIs with no users when creating LCSSA form. Patch by Andrew Clinton. 
llvm-svn: 127674
 2011-03-15 07:41:25 +00:00
Eli Friedman
c0bfbd0610 PR9450: Make switch optimization in SimplifyCFG not dependent on the ordering 
of pointers in an std::map.

llvm-svn: 127650
 2011-03-15 02:23:35 +00:00
Eli Friedman
d1e9ff0d6c PR9420; an instruction before an unreachable is guaranteed not to have any 
reachable uses, but there still might be uses in dead blocks.  Use the
standard solution of replacing all the uses with undef.  This is
a rare case because it's very sensitive to phase ordering in SimplifyCFG.

llvm-svn: 127299
 2011-03-09 00:48:33 +00:00
Jakob Stoklund Olesen
c7bf5eaafb DenseMap<uintptr_t,...> doesn't allow all values as keys. 
Avoid colliding with the sentinels, hopefully unbreaking
llvm-gcc-x86_64-linux-selfhost.

llvm-svn: 126982
 2011-03-04 02:48:56 +00:00
Frits van Bommel
4a2b658705 Teach SimplifyCFG that (switch (select cond, X, Y)) is better expressed as a branch. 
Based on a patch by Alistair Lynn.

llvm-svn: 126647
 2011-02-28 09:44:07 +00:00
Benjamin Kramer
39a5d8596c Revert "SimplifyCFG: GEPs with just one non-constant index are also cheap." 
Yes, there are other types than i8* and GEPs on them can produce an add+multiply.
We don't consider that cheap enough to be speculatively executed.

llvm-svn: 126481
 2011-02-25 10:33:33 +00:00
Benjamin Kramer
44b43a85db SimplifyCFG: GEPs with just one non-constant index are also cheap. 
llvm-svn: 126452
 2011-02-24 23:26:09 +00:00
Benjamin Kramer
b5996b08b7 SimplifyCFG: GEPs with constant indices are cheap enough to be executed unconditionally. 
llvm-svn: 126445
 2011-02-24 22:46:11 +00:00
Devang Patel
29b946c0bd Do not use DIFactory. Use DIBuilder. 
llvm-svn: 126398
 2011-02-24 18:49:55 +00:00
Duncan Sands
17a277da6d If the phi node was used by an unreachable instruction that ends up using 
itself without going via a phi node then we could return false here in
spite of making a change.  Also, tweak the comment because this method
can (and always could) return true without deleting the original phi node.
For example, if the phi node was used by a read-only invoke instruction
which is used by another phi node phi2 which is only used by and only uses
the invoke, then phi2 would be deleted but not the invoke instruction and
not the original phi node.

llvm-svn: 126129
 2011-02-21 17:32:05 +00:00
Duncan Sands
702e8b136e Simplify RecursivelyDeleteDeadPHINode. The only functionality change 
should be that if the phi is used by a side-effect free instruction with
no uses then the phi and the instruction now get zapped (checked by the
unittest).

llvm-svn: 126124
 2011-02-21 16:27:36 +00:00
Nick Lewycky
ecae3aec02 Make RecursivelyDeleteDeadPHINode delete a phi node that has no users and add a 
test for that. With this change, test/CodeGen/X86/codegen-dce.ll no longer finds
any instructions to DCE, so delete the test.

Also renamed J and JP to I and IP in RecursivelyDeleteDeadPHINode.

llvm-svn: 126088
 2011-02-20 18:05:56 +00:00