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1951 Commits

Author SHA1 Message Date
Devang Patel
a8992b3e72 There is no need to force DebugLoc on a PHI at this point. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131427 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-05-16 22:05:03 +00:00
Devang Patel
227dfdb3c4 Preserve debug info for unused zero extended boolean argument. 
Radar 9422775.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131422 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-05-16 21:24:05 +00:00
Benjamin Kramer
10fcfb53fd SimplifyCFG: Use ComputeMaskedBits to prune dead cases from switch instructions. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131345 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-05-14 15:57:25 +00:00
Devang Patel
a922ba7edc Set debug location for new PHI nodes created in exit block. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130894 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-05-04 23:58:22 +00:00
Devang Patel
67352b3ce7 Scanning entire basic block may be too expensive in terms of compile time. Instead, just use whatever location info first non-phi instruction has. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130729 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-05-02 21:57:00 +00:00
Devang Patel
40348e8d1f Assing line number info to new PHIs created by SSA updater. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130551 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-29 22:28:59 +00:00
Peter Collingbourne
57808b3da0 SimplifyCFG: Expose phi node folding cost threshold as command line parameter 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130528 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-29 18:47:38 +00:00
Peter Collingbourne
f15907fead SimplifyCFG: Add CostRemaining parameter to DominatesMergePoint 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130527 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-29 18:47:31 +00:00
Peter Collingbourne
8a70192b51 SimplifyCFG: Add Trunc, ZExt and SExt to the list of cheap instructions for phi node folding 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130526 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-29 18:47:25 +00:00
Devang Patel
81ad03c020 Remove DbgDeclare only if all uses are converted. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130431 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-28 20:32:02 +00:00
Jay Foad
ddcdcc8863 Remove unused STL header includes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130068 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-23 19:53:52 +00:00
Jay Foad
ec9186bcf9 PR9214: Convert Metadata API to use ArrayRef. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129932 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-21 19:59:31 +00:00
Jay Foad
1a0390253b Trivial simplification. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129759 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-19 15:23:29 +00:00
Chris Lattner
7a2bdde0a0 Fix a ton of comment typos found by codespell. Patch by 
Luis Felipe Strano Moraes!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129558 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-15 05:18:47 +00:00
Chris Lattner
3c6e746b5f 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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129502 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-14 02:44:53 +00:00
Chris Lattner
c8fbc34869 comment cleanup, use moveBefore instead of removeFromParent+insertBefore. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129319 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-11 23:24:57 +00:00
Jay Foad
562b84b3ae Don't include Operator.h from InstrTypes.h. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129271 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-11 09:35:34 +00:00
Devang Patel
60d490cdc7 Do not let debug info interfer with branch folding. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129114 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-07 23:11:25 +00:00
Devang Patel
949666ea16 While hoisting common code from if/else, hoist debug info intrinsics if they match. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129078 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-07 17:27:36 +00:00
Devang Patel
ae6c95b58e Simplify. isIdenticalToWhenDefined() checks opcode. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129041 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-07 00:30:15 +00:00
Devang Patel
d418194036 While folding branch to a common destination into a predecessor, copy dbg values also. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129035 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-06 22:37:20 +00:00
Eli Friedman
eeb7f4ce2d 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...)



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128802 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-04 00:37:38 +00:00
Eli Friedman
71ad2c9eda 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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128782 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-04-02 22:45:17 +00:00
Jay Foad
3ecfc861b4 Remove PHINode::reserveOperandSpace(). Instead, add a parameter to 
PHINode::Create() giving the (known or expected) number of operands.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128537 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-30 11:28:46 +00:00
Jay Foad
d8b4fb4aab (Almost) always call reserveOperandSpace() on newly created PHINodes. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128535 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-30 11:19:20 +00:00
Devang Patel
b99462117e Simplify. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128030 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-21 22:04:45 +00:00
Devang Patel
36fae67831 If an AllocaInst referred by DbgDeclareInst is used by a LoadInst then the LoadInst should also get a corresponding llvm.dbg.value intrinsic. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127924 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-18 23:45:43 +00:00
Devang Patel
79fcad85a4 Remove dead code. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127923 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-18 23:33:58 +00:00
Devang Patel
9c5822a966 Consider debug info intrinsics pointing to null value as dead instructions. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127922 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-18 23:28:02 +00:00
Devang Patel
813c9a0f19 Try to not lose variable's debug info during instcombine. 
This is done by lowering dbg.declare intrinsic into dbg.value intrinsic.
Radar 9143931.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127834 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-17 22:18:16 +00:00
Devang Patel
5ee20680c7 Refactor into a separate utility function. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127832 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-17 21:58:19 +00:00
Cameron Zwarich
6e51c6ad9d Clean up something noticed by Fritz. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127684 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-15 18:42:33 +00:00
Cameron Zwarich
838b97edfa Do not add PHIs with no users when creating LCSSA form. Patch by Andrew Clinton. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127674 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-15 07:41:25 +00:00
Eli Friedman
b1a6eab655 PR9450: Make switch optimization in SimplifyCFG not dependent on the ordering 
of pointers in an std::map.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127650 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-15 02:23:35 +00:00
Eli Friedman
2adc5b6a17 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.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127299 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-09 00:48:33 +00:00
Jakob Stoklund Olesen
2bc2a08b1b DenseMap<uintptr_t,...> doesn't allow all values as keys. 
Avoid colliding with the sentinels, hopefully unbreaking
llvm-gcc-x86_64-linux-selfhost.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126982 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-03-04 02:48:56 +00:00
Frits van Bommel
f7b2a9d7df Teach SimplifyCFG that (switch (select cond, X, Y)) is better expressed as a branch. 
Based on a patch by Alistair Lynn.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126647 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-28 09:44:07 +00:00
Benjamin Kramer
278be783b5 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126481 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-25 10:33:33 +00:00
Benjamin Kramer
9ae59e3444 SimplifyCFG: GEPs with just one non-constant index are also cheap. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126452 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-24 23:26:09 +00:00
Benjamin Kramer
9b61c550c2 SimplifyCFG: GEPs with constant indices are cheap enough to be executed unconditionally. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126445 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-24 22:46:11 +00:00
Devang Patel
afd0d0e8a7 Do not use DIFactory. Use DIBuilder. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126398 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-24 18:49:55 +00:00
Duncan Sands
2cfbf018a9 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126129 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-21 17:32:05 +00:00
Duncan Sands
b4098ba03d 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).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126124 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-21 16:27:36 +00:00
Nick Lewycky
eff5e69c82 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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126088 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-20 18:05:56 +00:00
Nick Lewycky
1a4021a2be Teach RecursivelyDeleteDeadPHINodes to handle multiple self-references. Patch 
by Andrew Clinton!


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126077 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-20 08:38:20 +00:00
Chris Lattner
f5ebfb0d28 Don't unroll loops whose header block's address is taken. 
This is part of a futile attempt to not "break" bizzaro
code like this:

 l1:
  printf("l1: %p\n", &&l1);
  ++x;

  if( x < 3 ) goto l1;


Previously we'd fold &&l1 to 1, which is fine per our semantics
but not helpful to the user.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125827 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-18 04:25:21 +00:00
Cameron Zwarich
4a60b932a2 Rename 'loopsimplify' to 'loop-simplify'. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125317 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-10 23:38:10 +00:00
Benjamin Kramer
33828bcb24 SimplifyCFG: Track the number of used icmps when turning a icmp chain into a switch. If we used only one icmp, don't turn it into a switch. 
Also prevent the switch-to-icmp transform from creating identity adds, noticed by Marius Wachtler.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125056 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-07 22:37:28 +00:00
Benjamin Kramer
042b27f40e SimplifyCFG: Also transform switches that represent a range comparison but are not sorted into sub+icmp. 
This transforms another 1000 switches in gcc.c.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124826 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-03 22:51:41 +00:00
Benjamin Kramer
56442dfdcf SimplifyCFG: Turn switches into sub+icmp+branch if possible. 
This makes the job of the later optzn passes easier, allowing the vast amount of
icmp transforms to chew on it.

We transform 840 switches in gcc.c, leading to a 16k byte shrink of the resulting
binary on i386-linux.

The testcase from README.txt now compiles into
  decl  %edi
  cmpl  $3, %edi
  sbbl  %eax, %eax
  andl  $1, %eax
  ret

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124724 91177308-0d34-0410-b5e6-96231b3b80d8
 2011-02-02 15:56:22 +00:00