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2010-06-26Clean up some problems with extra CFG edges being introduced duringBob Wilson
if-conversion. The RemoveExtraEdges function doesn't work for blocks that end with unanalyzable branches, so in those cases, the "extra" edges must be explicitly removed. The CopyAndPredicateBlock and MergeBlocks methods can also avoid copying successor edges due to branches that have already been removed. The latter case is especially helpful when MergeBlocks is called for handling "diamond" if-conversions, where otherwise you can end up with some weird intermediate states in the CFG. Unfortunately I've been unable to find cases where this cleanup actually makes a significant difference in the code. There is one test where we manage to remove an empty block at the end of a function. Radar 6911268. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106939 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25make sure to handle dbg_value instructions in the middle of the block, notJim Grosbach
just at the head, when doing diamond if-conversion. rdar://7797940 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106907 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25Don't track kills in VNInfo. Use interval ends instead.Jakob Stoklund Olesen
The VNInfo.kills vector was almost unused except for all the code keeping it updated. The few places using it were easily rewritten to check for interval ends instead. The two new methods LiveInterval::killedAt and killedInRange are replacements. This brings us down to 3 independent data structures tracking kills. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106905 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25Change if-conversion block size limit checks to add some flexibility.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106901 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25Collect debug info for optimized variables of inlined functions.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106895 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-2580 column and typo fixJim Grosbach
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106894 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25The hasMemory argument is irrelevant to how the argumentDale Johannesen
for an "i" constraint should get lowered; PR 6309. While this argument was passed around a lot, this is the only place it was used, so it goes away from a lot of other places. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106893 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25- Reapply r106066 now that the bzip2 build regression has been fixed.Bill Wendling
- 2010-06-25-CoalescerSubRegDefDead.ll is the testcase for r106878. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106880 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25We should remove the live range from the destination register only if *all* defsBill Wendling
are dead, not just the def of this register. I.e., a register could be dead, but it's subreg isn't. Testcase to follow with a subsequent patch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106878 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25Cosmetic.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106865 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25Remove variables which are assigned to but for which the valueDuncan Sands
is not used. Spotted by gcc-4.6. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106854 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25use ArgOperand accessorsGabor Greif
and CallInst for getting hold of the intrinsic's arguments simplify along the way (at least for me this is much more legible now) Bill, Baldrick or Anton, please review\! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106838 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25use ArgOperand API (the simple part)Gabor Greif
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106837 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25use ArgOperand APIGabor Greif
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106836 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25use ArgOperand APIGabor Greif
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106835 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25use ArgOperand API and CallSite to access arguments of CallInstGabor Greif
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106833 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25use ArgOperand API and CallSite to access arguments of CallInstGabor Greif
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106829 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25use ArgOperand APIGabor Greif
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106828 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25prune an includeGabor Greif
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106827 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-25Fix a case where an earlyclobber operand of an asmDale Johannesen
is reused as an input. PR 4118. Testcase is too big, as usual with bugs in this area, but there's one in the PR. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106816 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Make sure all eliminated kills are removed from VNInfo lists.Jakob Stoklund Olesen
This fixes PR7479 and PR7485. The test cases from those PRs are big, so not included. However, PR7485 comes from self hosting on FreeBSD, so we will surely hear about any regression. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106811 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Add some comments.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106809 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Teach EmitLiveInCopies to omit copies for unused virtual registers,Dan Gohman
and to clean up unused incoming physregs from the live-in list. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106805 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24It's possible that a flag is added to the SDNode that points back to theBill Wendling
original SDNode. This is badness. Also, this function allows one SDNode to point multiple flags to another SDNode. Badness as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106793 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24DBG_VALUE machine instruction pointing to undefined register for a variable ↵Devang Patel
justify a separate scope if the variable is inlined function's argument. Radar 8122864. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106792 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Don't return a std::vector in the Spiller interface, but take a reference to aJakob Stoklund Olesen
vector instead. This avoids needless copying and allocation. Add documentation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106788 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Remove the now unused LiveIntervals::getVNInfoSourceReg().Jakob Stoklund Olesen
This method was always a bit too simplistic for the real world. It didn't really deal with subregisters and such. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106781 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Teach AdjustCopiesBackFrom to also use CoalescerPair to identify compatible ↵Jakob Stoklund Olesen
copies. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106780 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Remove the -fast-spill option.Jakob Stoklund Olesen
This code path has never really been used, and we are going to be handling spilling through the Spiller interface in the future. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106777 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Loosen up the requirements in the Horrible Hack(tm) to include all selectorsBill Wendling
which don't have a catch-all associated with them not just clean-ups. This fixes the SingleSource/Benchmarks/Shootout-C++/except.cpp testcase that broke because of my change r105902. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106772 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Replace a big gob of old coalescer logic with the new CoalescerPair class.Jakob Stoklund Olesen
CoalescerPair can determine if a copy can be coalesced, and which register gets merged away. The old logic in SimpleRegisterCoalescing had evolved into something a bit too convoluted. This second attempt fixes some crashes that only occurred Linux. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106769 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Print the LSBs of a SlotIndex symbolically using letters referring to theJakob Stoklund Olesen
[L]oad, [u]se, [d]ef, or [S]tore slots. This makes it easier to see if two indices refer to the same instruction, avoiding mental mod 4 calculations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106766 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Simplify this code; switch lowering shouldn't produce casesDan Gohman
which trivially fold away. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106765 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Be more strict about subreg-to-subreg copies in CoalescerPair.Jakob Stoklund Olesen
Also keep track of the original DstREg before subregister adjustments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106753 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Verify that VNI kills are pointing to existing instructions.Jakob Stoklund Olesen
In this case it is essential that the kill is real because the spiller will decide to omit a spill if it thinks there is a later kill. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106751 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Eliminate the other half of the BRCOND optimization, and updateDan Gohman
as many tests as possible. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106749 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Eliminate the first have of the optimization which eliminates BRCONDDan Gohman
when the condition is constant. This optimization shouldn't be necessary, because codegen shouldn't be able to find dead control paths that the IR-level optimizer can't find. And it's undesirable, because it encourages bugpoint to leave "br i1 false" branches in its output. And it wasn't updating the CFG. I updated all the tests I could, but some tests are too reduced and I wasn't able to meaningfully preserve them. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106748 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Reapply r106634, now that the bug it exposed is fixed.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106746 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Optimize the "bit test" code path for switch lowering in theDan Gohman
case where the bit mask has exactly one bit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106716 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Revert "Replace a big gob of old coalescer logic with the new CoalescerPair ↵Jakob Stoklund Olesen
class." Whiny buildbots. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106710 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-24Replace a big gob of old coalescer logic with the new CoalescerPair class.Jakob Stoklund Olesen
CoalescerPair can determine if a copy can be coalesced, and which register gets merged away. The old logic in SimpleRegisterCoalescing had evolved into something a bit too convoluted. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106701 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-23MorphNodeTo doesn't preserve the memory operands. Because we're morphing a nodeBill Wendling
into the same node, but with different non-memory operands, we need to replace the memory operands after it's finished morphing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106643 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-23Revert r106263, "Fold the ShrinkDemandedOps pass into the regular ↵Daniel Dunbar
DAGCombiner pass,"... it was causing both 'file' (with clang) and 176.gcc (with llvm-gcc) to be miscompiled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106634 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-23Some targets don't require the fencing MEMBARRIER instructions surroundingJim Grosbach
atomic intrinsics, either because the use locking instructions for the atomics, or because they perform the locking directly. Add support in the DAG combiner to fold away the fences. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106630 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-23Add a few VNInfo data structure checks.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106627 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-23Revert r106066, "Create a more targeted fix for not sinking instructions ↵Daniel Dunbar
into a range where it"... it causes bzip2 to be miscompiled by Clang. Conflicts: lib/CodeGen/MachineSink.cpp git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106614 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-22Also convert SUBREG_TO_REG to a KILL when relevant, like the other subregJakob Stoklund Olesen
instructions. This does not affect codegen much because SUBREG_TO_REG is only used by X86 and X86 does not use the register scavenger, but it prevents verifier errors. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106583 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-22Move PHIElimination's SplitCriticalEdge for MachineBasicBlocks outDan Gohman
into a utility routine, teach it how to update MachineLoopInfo, and make use of it in MachineLICM to split critical edges on demand. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106555 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-22Remove the SimpleJoin optimization from SimpleRegisterCoalescing.Jakob Stoklund Olesen
Measurements show that it does not speed up coalescing, so there is no reason the keep the added complexity around. Also clean out some unused methods and static functions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106548 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-22Use pre-increment instead of post-increment when the result is not used.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106542 91177308-0d34-0410-b5e6-96231b3b80d8
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