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2011-01-19Implement RAGreedy::splitAroundRegion and remove loop splitting.Jakob Stoklund Olesen
Region splitting includes loop splitting as a subset, and it is more generic. The splitting heuristics for variables that are live in more than one block are now: 1. Try to create a region that covers multiple basic blocks. 2. Try to create a new live range for each block with multiple uses. 3. Spill. Steps 2 and 3 are similar to what the standard spiller is doing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123853 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-18Add RAGreedy methods for splitting live ranges around regions.Jakob Stoklund Olesen
Analyze the live range's behavior entering and leaving basic blocks. Compute an interference pattern for each allocation candidate, and use SpillPlacement to find an optimal region where that register can be live. This code is still not enabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123774 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-18Remove unused variables found by gcc-4.6's -Wunused-but-set-variable.Jeffrey Yasskin
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123707 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-18Remove checking that prevented overlapping CALLSEQ_START/CALLSEQ_ENDStuart Hastings
ranges, add legalizer support for nested calls. Necessary for ARM byval support. Radar 7662569. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123704 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-17Fix an off-by-one error in ctpop combining.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123664 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-17Add a DAGCombine to turn (ctpop x) u< 2 into (x & x-1) == 0.Benjamin Kramer
This shaves off 4 popcounts from the hacked 186.crafty source. This is enabled even when a native popcount instruction is available. The combined code is one operation longer but it should be faster nevertheless. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123621 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-16reapply my fix for PR8961 with a tweak to properly handleChris Lattner
multi-instruction sequences like calls. Many thanks to Jakob for finding a testcase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123559 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-15Add an assert so we don't silently miscompile ctpop for bit widths > 128.Benjamin Kramer
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123549 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-15Reimplement CTPOP legalization with the "best" algorithm fromBenjamin Kramer
http://graphics.stanford.edu/~seander/bithacks.html#CountBitsSetParallel In a silly microbenchmark on a 65 nm core2 this is 1.5x faster than the old code in 32 bit mode and about 2x faster in 64 bit mode. It's also a lot shorter, especially when counting 64 bit population on a 32 bit target. I hope this is fast enough to replace Kernighan-style counting loops even when the input is rather sparse. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123547 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-14Update CMake build.Ted Kremenek
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123491 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-14Delete an assignment to ThisBB which isn't needed, and tidy up someDan Gohman
comments. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123479 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-14Add a possibility to switch between CFI directives- and table-based frame ↵Anton Korobeynikov
description emission. Currently all the backends use table-based stuff. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123476 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-14Add CFI directives-based frame information emission. Not hooked yet.Anton Korobeynikov
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123474 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-14Split stuff as a preparation for CFI directives-based frame information emissionAnton Korobeynikov
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123473 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-14Support for precise scheduling of the instruction selection DAG,Andrew Trick
disabled in this checkin. Sorry for the large diffs due to refactoring. New functionality is all guarded by EnableSchedCycles. Scheduling the isel DAG is inherently imprecise, but we give it a best effort: - Added MayReduceRegPressure to allow stalled nodes in the queue only if there is a regpressure need. - Added BUHasStall to allow checking for either dependence stalls due to latency or resource stalls due to pipeline hazards. - Added BUCompareLatency to encapsulate and standardize the heuristics for minimizing stall cycles (vs. reducing register pressure). - Modified the bottom-up heuristic (now in BUCompareLatency) to prioritize nodes by their depth rather than height. As long as it doesn't stall, height is irrelevant. Depth represents the critical path to the DAG root. - Added hybrid_ls_rr_sort::isReady to filter stalled nodes before adding them to the available queue. Related Cleanup: most of the register reduction routines do not need to be templates. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123468 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-14Try for the third time to teach getFirstTerminator() about debug values.Jakob Stoklund Olesen
This time let's rephrase to trick gcc-4.3 into not miscompiling. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123432 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-14Revert r123419. It still breaks llvm-gcc-i386-linux-selfhost.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123423 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-14Set the insertion point correctly for instructions generated by load folding:Chris Lattner
they should go *before* the new instruction not after it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123420 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-14Try again to teach getFirstTerminator() about debug values.Jakob Stoklund Olesen
Fix some callers to better deal with debug values. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123419 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-13Better terminator avoidance.Jakob Stoklund Olesen
This approach also works when the terminator doesn't have a slot index. (Which can happen??) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123413 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-13Temporary workaround for an i386 crash in LiveDebugVariables.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123400 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-13Teach frame lowering to ignore debug values after the terminators.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123399 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-13Speculatively revert r123384 to make llvm-gcc-i386-linux-selfhost buildbot ↵Devang Patel
happy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123389 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-13Teach MachineBasicBlock::getFirstTerminator to ignore debug values.Jakob Stoklund Olesen
It will still return an iterator that points to the first terminator or end(), but there may be DBG_VALUE instructions following the first terminator. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123384 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-13Fix r123346 to handle scalar types too.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123352 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-13Add missing space in debug outputJakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123351 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-12Apply the patch from PR8958, which allows llc to get slightlyDan Gohman
further on the associated testcase before aborting. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123346 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-12Try again enabling LiveDebugVariables.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123342 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-12Don't emit a DBG_VALUE for a spill slot that the rewriter decided not to use ↵Jakob Stoklund Olesen
after all. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123339 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-12Fix braino in dominator tree walk.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123338 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-12Sometimes, old virtual registers can linger on DBG_VALUE instructions.Jakob Stoklund Olesen
Make sure we don't crash in that case, but simply turn them into %noreg instead. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123335 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-12Teach VirtRegRewriter to update slot indexes when erasing instructions.Jakob Stoklund Olesen
It was leaving dangling pointers in the slot index maps. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123334 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-12Annotate VirtRegRewriter debug output with slot indexes.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123333 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-12Verify slot index ordering.Jakob Stoklund Olesen
The slot indexes must be monotonically increasing through the function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123324 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-12Verify that machine instruction parent pointers are consistent.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123322 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-11The world is not ready for LiveDebugVariables yet.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123290 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-11Enable LiveDebugVariables by default.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123282 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-11Don't insert DBG_VALUE instructions after the first terminator.Jakob Stoklund Olesen
For one, MachineBasicBlock::getFirstTerminator() doesn't understand what is happening, and it also makes sense to have all control flow run through the DBG_VALUE. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123277 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-11Appropriately truncate debug info range in dwarf output.Devang Patel
This is not yet completely enabled. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123274 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-11Move ExpandAtomic into the integer expansion routines - it's only used there.Eric Christopher
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123202 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-10Fix PR 8916 (qv for analysis), at least the immediate problem.Dale Johannesen
There's an inherent tension in DAGCombine between assuming that things will be put in canonical form, and the Depth mechanism that disables transformations when recursion gets too deep. It would not surprise me if there's a lot of little bugs like this one waiting to be discovered. The mechanism seems fragile and I'd suggest looking at it from a design viewpoint. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123191 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-10Rename TargetFrameInfo into TargetFrameLowering. Also, put couple of FIXMEs ↵Anton Korobeynikov
and fixes here and there. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123170 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-10fit in 80 cols and use MBB::isSuccessor instead of a handChris Lattner
rolled std::find. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123164 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-10Simplify a bunch of isVirtualRegister() and isPhysicalRegister() logic.Jakob Stoklund Olesen
These functions not longer assert when passed 0, but simply return false instead. No functional change intended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123155 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-09Remove MachineRegisterInfo::getLastVirtReg(), it was giving wrong resultsJakob Stoklund Olesen
when no virtual registers have been allocated. It was only used to resize IndexedMaps, so provide an IndexedMap::resize() method such that Map.grow(MRI.getLastVirtReg()); can be replaced with the simpler Map.resize(MRI.getNumVirtRegs()); This works correctly when no virtuals are allocated, and it bypasses the to/from index conversions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123130 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-09sort this.Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123129 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-09Teach TargetRegisterInfo how to cram stack slot indexes in with the virtual andJakob Stoklund Olesen
physical register numbers. This makes the hack used in LiveInterval official, and lets LiveInterval be oblivious of stack slots. The isPhysicalRegister() and isVirtualRegister() predicates don't know about this, so when a variable may contain a stack slot, isStackSlot() should always be tested first. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123128 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-09Add a forgotten VireReg2IndexFunctor.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123123 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-09Eliminate some extra hash table lookups.Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123115 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-09Add an informative comment.Cameron Zwarich
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123114 91177308-0d34-0410-b5e6-96231b3b80d8
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