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* I think there was some confusion about what I meant. :-) Replacing the comment.Bill Wendling2011-08-161-1/+4
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* After talking with Bill, it seems like the LandingPad handling here is likelyEli Friedman2011-08-161-4/+1
| | | | | | | | | to be wrong (or at least somewhat suspect). Leave a FIXME for Bill. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137694 91177308-0d34-0410-b5e6-96231b3b80d8
* Minor comment fixes.Eli Friedman2011-08-161-1/+1
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* Update SimplifyCFG for atomic operations.Eli Friedman2011-08-151-10/+26
| | | | | | | | | | 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? git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137691 91177308-0d34-0410-b5e6-96231b3b80d8
* land David Blaikie's patch to de-constify Type, with a few tweaks.Chris Lattner2011-07-181-1/+1
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* Convert CallInst and InvokeInst APIs to use ArrayRef.Jay Foad2011-07-151-4/+2
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* Add r134057 back, but splice the predecessor after the successors phiRafael Espindola2011-06-301-1/+1
| | | | | | | | | nodes. Original message: Let simplify cfg simplify bb with only debug and lifetime intrinsics. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134182 91177308-0d34-0410-b5e6-96231b3b80d8
* Temporarily revert r134057: "Let simplify cfg simplify bb with only debug and Chad Rosier2011-06-291-1/+1
| | | | | | | lifetime intrinsics" due to buildbot failures. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134071 91177308-0d34-0410-b5e6-96231b3b80d8
* Let simplify cfg simplify bb with only debug and lifetime intrinsics.Rafael Espindola2011-06-291-1/+1
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* Fix PR10103: Less code for enum type translation.Hans Wennborg2011-06-181-0/+74
| | | | | | | | | | | 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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133344 91177308-0d34-0410-b5e6-96231b3b80d8
* If the block that we're threading through is jumped to by an indirect branch,Bill Wendling2011-06-041-1/+3
| | | | | | | | | | | | | 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 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@132638 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a parameter to ConstantFoldTerminator() that callers can use to ask it ↵Frits van Bommel2011-05-221-1/+1
| | | | | | | | | | 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. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131855 91177308-0d34-0410-b5e6-96231b3b80d8
* Reapply r131605. This time with a fix, which is to use NoFolder.Devang Patel2011-05-191-30/+34
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* revert 131605 to fix PR9946.Rafael Espindola2011-05-191-36/+31
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* Use IRBuilder.Devang Patel2011-05-191-2/+2
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* Use IRBuilder while simplifying unreachable.Devang Patel2011-05-191-7/+8
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* Use IRBuilder while simplifying conditional branch.Devang Patel2011-05-181-31/+36
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* Use IRBuilder while simplifying branch.Devang Patel2011-05-181-12/+13
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* Use IRBuilder while simplifying return instruction.Devang Patel2011-05-181-11/+13
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* Spread use of IRBuilder even more.Devang Patel2011-05-181-10/+12
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* Use IRBuilder while simplifying switch instruction.Devang Patel2011-05-181-15/+18
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* Use IRBuilder while simplifying unwind.Devang Patel2011-05-181-7/+9
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* Use IRBuilder while simplifying terminator.Devang Patel2011-05-181-4/+7
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* Use IRBuilder while simplifying unconditional branch.Devang Patel2011-05-181-6/+11
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* Use IRBuilder while folding two entry PHINode.Devang Patel2011-05-181-6/+8
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* Set up IRBuilder for use during simplification.Devang Patel2011-05-181-0/+3
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* Preseve line numbers while simplifying CFG.Devang Patel2011-05-171-6/+16
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* SimplifyCFG: Use ComputeMaskedBits to prune dead cases from switch instructions.Benjamin Kramer2011-05-141-1/+36
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* SimplifyCFG: Expose phi node folding cost threshold as command line parameterPeter Collingbourne2011-04-291-1/+6
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* SimplifyCFG: Add CostRemaining parameter to DominatesMergePointPeter Collingbourne2011-04-291-9/+38
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* SimplifyCFG: Add Trunc, ZExt and SExt to the list of cheap instructions for ↵Peter Collingbourne2011-04-291-0/+3
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* rework FoldBranchToCommonDest to exit earlier when there is a bonusChris Lattner2011-04-141-39/+30
| | | | | | | | | | | | | | 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
* comment cleanup, use moveBefore instead of removeFromParent+insertBefore.Chris Lattner2011-04-111-9/+5
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* Do not let debug info interfer with branch folding.Devang Patel2011-04-071-0/+6
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* While hoisting common code from if/else, hoist debug info intrinsics if they ↵Devang Patel2011-04-071-8/+18
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* Simplify. isIdenticalToWhenDefined() checks opcode.Devang Patel2011-04-071-4/+2
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* While folding branch to a common destination into a predecessor, copy dbg ↵Devang Patel2011-04-061-4/+17
| | | | | | values also. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129035 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove PHINode::reserveOperandSpace(). Instead, add a parameter toJay Foad2011-03-301-1/+1
| | | | | | 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
* (Almost) always call reserveOperandSpace() on newly created PHINodes.Jay Foad2011-03-301-1/+3
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* PR9450: Make switch optimization in SimplifyCFG not dependent on the orderingEli Friedman2011-03-151-7/+18
| | | | | | | | of pointers in an std::map. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127650 91177308-0d34-0410-b5e6-96231b3b80d8
* PR9420; an instruction before an unreachable is guaranteed not to have anyEli Friedman2011-03-091-1/+3
| | | | | | | | | | 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
* Teach SimplifyCFG that (switch (select cond, X, Y)) is better expressed as a ↵Frits van Bommel2011-02-281-1/+26
| | | | | | | | | 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
* Revert "SimplifyCFG: GEPs with just one non-constant index are also cheap."Benjamin Kramer2011-02-251-5/+3
| | | | | | | 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
* SimplifyCFG: GEPs with just one non-constant index are also cheap.Benjamin Kramer2011-02-241-3/+5
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* SimplifyCFG: GEPs with constant indices are cheap enough to be executed ↵Benjamin Kramer2011-02-241-0/+5
| | | | | | unconditionally. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126445 91177308-0d34-0410-b5e6-96231b3b80d8
* SimplifyCFG: Track the number of used icmps when turning a icmp chain into a ↵Benjamin Kramer2011-02-071-7/+22
| | | | | | | | 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
* SimplifyCFG: Also transform switches that represent a range comparison but ↵Benjamin Kramer2011-02-031-6/+17
| | | | | | | | 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
* SimplifyCFG: Turn switches into sub+icmp+branch if possible.Benjamin Kramer2011-02-021-0/+32
| | | | | | | | | | | | | | | | | 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
* Re-apply r124518 with fix. Watch out for invalidated iterator.Evan Cheng2011-01-291-18/+7
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* Revert r124518. It broke Linux self-host.Evan Cheng2011-01-291-7/+18
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