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410 Commits

Author SHA1 Message Date
Nick Lewycky
295e397220 Teach simplifycfg to recompute branch weights when merging some branches, and 
to discard weights when appropriate. Still more to do (and a new TODO), but
it's a start!

llvm-svn: 147286
 2011-12-27 04:31:52 +00:00
Nick Lewycky
56e04db381 Update the branch weight metadata when reversing the order of a branch. 
llvm-svn: 147280
 2011-12-26 20:54:14 +00:00
Nick Lewycky
80b1ea7ea3 Sort includes, canonicalize whitespace, fix typos. No functionality change. 
llvm-svn: 147279
 2011-12-26 20:37:40 +00:00
Nick Lewycky
9adbd36737 Make some intrinsics safe to speculatively execute. 
llvm-svn: 147036
 2011-12-21 05:52:02 +00:00
Kevin Enderby
42fffe915a Revert r146822 at Pete Cooper's request as it broke clang self hosting. 
Hope I did this correctly :)

llvm-svn: 146834
 2011-12-17 19:48:52 +00:00
Pete Cooper
0ec73f6e98 SimplifyCFG now predicts some conditional branches to true or false depending on previous branch on same comparison operands. 
For example, 

if (a == b) {
    if (a > b) // this is false
    
Fixes some of the issues on <rdar://problem/10554090>

llvm-svn: 146822
 2011-12-17 06:32:38 +00:00
Dan Gohman
1add31cc93 Move Instruction::isSafeToSpeculativelyExecute out of VMCore and 
into Analysis as a standalone function, since there's no need for
it to be in VMCore. Also, update it to use isKnownNonZero and
other goodies available in Analysis, making it more precise,
enabling more aggressive optimization.

llvm-svn: 146610
 2011-12-14 23:49:11 +00:00
Duncan Sands
d883f9f371 Delete trivial landing pads that just continue unwinding the caught 
exception.

llvm-svn: 139117
 2011-09-05 12:57:57 +00:00
Benjamin Kramer
0e1a09f38c Address review comments. 
- Reword comments.
- Allow undefined behavior interfering with undefined behavior.
- Add address space checks.

llvm-svn: 138619
 2011-08-26 02:25:55 +00:00
Benjamin Kramer
dc1c57af91 SimplifyCFG: If we have a PHI node that can evaluate to NULL and do a load or store to the address returned by the PHI node then we can consider this incoming value as dead and remove the edge pointing there, unless there are instructions that can affect control flow executed in between. 
In theory this could be extended to other instructions, eg. division by zero, but it's likely that it will "miscompile" some code because people depend on div by zero not trapping. NULL pointer dereference usually leads to a crash so we should be on the safe side.

This shrinks the size of a Release clang by 16k on x86_64.

llvm-svn: 138618
 2011-08-26 01:22:29 +00:00
Bill Wendling
32612231af I think there was some confusion about what I meant. :-) Replacing the comment. 
llvm-svn: 137743
 2011-08-16 20:41:17 +00:00
Eli Friedman
f969dabf83 After talking with Bill, it seems like the LandingPad handling here is likely 
to be wrong (or at least somewhat suspect).  Leave a FIXME for Bill.

llvm-svn: 137694
 2011-08-16 00:41:37 +00:00
Eli Friedman
eb7e5209e5 Minor comment fixes. 
llvm-svn: 137693
 2011-08-16 00:20:11 +00:00
Eli Friedman
6a475e691d Update SimplifyCFG for atomic operations. 
This commit includes a mention of the landingpad instruction, but it's not
changing the behavior around it.  I think the current behavior is correct,
though.  Bill, can you double-check that?

llvm-svn: 137691
 2011-08-15 23:59:28 +00:00
Chris Lattner
e1fe7061ce land David Blaikie's patch to de-constify Type, with a few tweaks. 
llvm-svn: 135375
 2011-07-18 04:54:35 +00:00
Jay Foad
c826df8fb7 Convert CallInst and InvokeInst APIs to use ArrayRef. 
llvm-svn: 135265
 2011-07-15 08:37:34 +00:00
Rafael Espindola
03cd7c7b76 Add r134057 back, but splice the predecessor after the successors phi 
nodes.

Original message:
Let simplify cfg simplify bb with only debug and lifetime intrinsics.

llvm-svn: 134182
 2011-06-30 20:14:24 +00:00
Chad Rosier
fc7dc596a4 Temporarily revert r134057: "Let simplify cfg simplify bb with only debug and 
lifetime intrinsics" due to buildbot failures.

llvm-svn: 134071
 2011-06-29 16:22:11 +00:00
Rafael Espindola
e9e560eb37 Let simplify cfg simplify bb with only debug and lifetime intrinsics. 
llvm-svn: 134057
 2011-06-29 05:25:47 +00:00
Hans Wennborg
e1d53b6e2b Fix PR10103: Less code for enum type translation. 
In cases such as the attached test, where the case value for a switch
destination is used in a phi node that follows the destination, it
might be better to replace that value with the condition value of the
switch, so that more blocks can be folded away with
TryToSimplifyUncondBranchFromEmptyBlock because there are less
conflicts in the phi node.

llvm-svn: 133344
 2011-06-18 10:28:47 +00:00
Bill Wendling
1da5257929 If the block that we're threading through is jumped to by an indirect branch, 
then we don't want to set the destination in the indirect branch to the
destination. This is because the indirect branch needs its destinations to have
had their block addresses taken. This isn't so of the new critical edge that's
split during this process. If it turns out that the destination block has only
one predecessor, and that being a BB with an indirect branch, then it won't be
marked as 'used' and may be removed.
PR10072

llvm-svn: 132638
 2011-06-04 09:42:04 +00:00
Frits van Bommel
df58ece78a Add a parameter to ConstantFoldTerminator() that callers can use to ask it to also clean up the condition of any conditional terminator it folds to be unconditional, if that turns the condition into dead code. This just means it calls RecursivelyDeleteTriviallyDeadInstructions() in strategic spots. It defaults to the old behavior. 
I also changed -simplifycfg, -jump-threading and -codegenprepare to use this to produce slightly better code without any extra cleanup passes (AFAICT this was the only place in -simplifycfg where now-dead conditions of replaced terminators weren't being cleaned up). The only other user of this function is -sccp, but I didn't read that thoroughly enough to figure out whether it might be holding pointers to instructions that could be deleted by this.

llvm-svn: 131855
 2011-05-22 16:24:18 +00:00
Devang Patel
8d9eb3b0f7 Reapply r131605. This time with a fix, which is to use NoFolder. 
llvm-svn: 131673
 2011-05-19 20:52:46 +00:00
Rafael Espindola
4ebe940cd4 revert 131605 to fix PR9946. 
llvm-svn: 131620
 2011-05-19 02:26:30 +00:00
Devang Patel
c5390e2f7f Use IRBuilder. 
llvm-svn: 131609
 2011-05-19 00:13:33 +00:00
Devang Patel
ecb22f0544 Use IRBuilder while simplifying unreachable. 
llvm-svn: 131607
 2011-05-19 00:09:21 +00:00
Devang Patel
fa6d0b4f84 Use IRBuilder while simplifying conditional branch. 
llvm-svn: 131605
 2011-05-18 23:59:51 +00:00
Devang Patel
877a16ea33 Use IRBuilder while simplifying branch. 
llvm-svn: 131598
 2011-05-18 23:18:47 +00:00
Devang Patel
3f94bed4e4 Use IRBuilder while simplifying return instruction. 
llvm-svn: 131580
 2011-05-18 21:33:11 +00:00
Devang Patel
3549e33227 Spread use of IRBuilder even more. 
llvm-svn: 131571
 2011-05-18 20:53:17 +00:00
Devang Patel
fd9b1daf82 Use IRBuilder while simplifying switch instruction. 
llvm-svn: 131566
 2011-05-18 20:35:38 +00:00
Devang Patel
40690a2df4 Use IRBuilder while simplifying unwind. 
llvm-svn: 131561
 2011-05-18 20:01:18 +00:00
Devang Patel
f0b8a243b9 Use IRBuilder while simplifying terminator. 
llvm-svn: 131552
 2011-05-18 18:43:31 +00:00
Devang Patel
faedd704bb Use IRBuilder while simplifying unconditional branch. 
llvm-svn: 131551
 2011-05-18 18:28:48 +00:00
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
Devang Patel
b75e746499 Preseve line numbers while simplifying CFG. 
llvm-svn: 131508
 2011-05-17 23:29:05 +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
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
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
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
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
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