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2011-01-24Resolve DanglingDbgValue of PHI nodes where the use follows dbg.value ↵Devang Patel
intrinisic. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124138 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-24Temporarily workaround JM/lencod miscompile (SIGSEGV).Andrew Trick
rdar://problem/8893967 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124137 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-23Add support for the --noexecstack option.Rafael Espindola
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124077 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-23Null initialize a few variables flagged byTed Kremenek
clang's -Wuninitialized-experimental warning. While these don't look like real bugs, clang's -Wuninitialized-experimental analysis is stricter than GCC's, and these fixes have the benefit of being general nice cleanups. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124073 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-23Delay the creation of eh_frame so that the user can change the defaults.Rafael Espindola
Add support for SHT_X86_64_UNWIND. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124059 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-23Remove more duplicated code.Rafael Espindola
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124056 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-23Remove duplicated code.Rafael Espindola
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124054 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-21Enable support for precise scheduling of the instruction selectionAndrew Trick
DAG. Disable using "-disable-sched-cycles". For ARM, this enables a framework for modeling the cpu pipeline and counting stalls. It also activates several heuristics to drive scheduling based on the model. Scheduling is inherently imprecise at this stage, and until spilling is improved it may defeat attempts to schedule. However, this framework provides greater control over tuning codegen. Although the flag is not target-specific, it should have very little affect on the default scheduler used by x86. The only two changes that affect x86 are: - scheduling a high-latency operation bumps the current cycle so independent operations can have their latency covered. i.e. two independent 4 cycle operations can produce results in 4 cycles, not 8 cycles. - Two operations with equal register pressure impact and no latency-based stalls on their uses will be prioritized by depth before height (height is irrelevant if no stalls occur in the schedule below this point). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123971 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-21Convert -enable-sched-cycles and -enable-sched-hazard to -disableAndrew Trick
flags. They are still not enable in this revision. Added TargetInstrInfo::isZeroCost() to fix a fundamental problem with the scheduler's model of operand latency in the selection DAG. Generalized unit tests to work with sched-cycles. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123969 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-20SplitKit requires that all defs are in place before calling useIntv().Jakob Stoklund Olesen
The value mapping gets confused about which original values have multiple new definitions so they may need phi insertions. This could probably be simplified by letting enterIntvBefore() take a live range to be added following the instruction. As long as the range stays inside the same basic block, value mapping shouldn't be a problem. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123926 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-20Add LiveIntervalMap::dumpCache() to print out the cache used by the ssa ↵Jakob Stoklund Olesen
update algorithm. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123925 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-20My editor's indent went crazy. Fix.Eric Christopher
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123909 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-20Expand invalid return values for umulo and smulo. Handle these similarlyEric Christopher
to add/sub by doing the normal operation and then checking for overflow afterwards. This generally relies on the DAG handling the later invalid operations as well. Fixes the 64-bit part of rdar://8622122 and rdar://8774702. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123908 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-20Sorry, several patches in one.Evan Cheng
TargetInstrInfo: Change produceSameValue() to take MachineRegisterInfo as an optional argument. When in SSA form, targets can use it to make more aggressive equality analysis. Machine LICM: 1. Eliminate isLoadFromConstantMemory, use MI.isInvariantLoad instead. 2. Fix a bug which prevent CSE of instructions which are not re-materializable. 3. Use improved form of produceSameValue. ARM: 1. Teach ARM produceSameValue to look pass some PIC labels. 2. Look for operands from different loads of different constant pool entries which have same values. 3. Re-implement PIC GA materialization using movw + movt. Combine the pair with a "add pc" or "ldr [pc]" to form pseudo instructions. This makes it possible to re-materialize the instruction, allow machine LICM to hoist the set of instructions out of the loop and make it possible to CSE them. It's a bit hacky, but it significantly improve code quality. 4. Some minor bug fixes as well. With the fixes, using movw + movt to materialize GAs significantly outperform the load from constantpool method. 186.crafty and 255.vortex improved > 20%, 254.gap and 176.gcc ~10%. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123905 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-20Selection DAG scheduler register pressure heuristic fixes.Andrew Trick
Added a check for already live regs before claiming HighRegPressure. Fixed a few cases of checking the wrong number of successors. Added some tracing until these heuristics are better understood. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123892 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-20Check that a live range exists before shortening it. This fixes PR8989.Jakob Stoklund Olesen
The live range may have been deleted earlier because of rematerialization. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123891 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-20Add hidden -verify-coalescing to run the machine code verifier before and afterJakob Stoklund Olesen
register coalescing. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123890 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-20Fix bug found by new clang warning.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123872 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-20Use only one API at a time.Eric Christopher
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123866 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-20If we can, lower the multiply part of a umulo/smulo call to a libcallEric Christopher
with an invalid type then split the result and perform the overflow check normally. Fixes the 32-bit parts of rdar://8622122 and rdar://8774702. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123864 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-20Fix debug info for merged global.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123862 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-19Divert Hopfield network debug output. It is very noisy.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123859 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-19Don't accidentally leave small gaps in the live ranges when leaving the activeJakob Stoklund Olesen
interval after an instruction. The leaveIntvAfter() method only adds liveness from the instruction's boundary index to the inserted copy. Ideally, SplitKit should be smarter about this, perhaps by combining useIntv() and leaveIntvAfter() into one method that guarantees continuity. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123858 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-19Fix register address expression. Patch by Ken Dyck.Devang Patel
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@123856 91177308-0d34-0410-b5e6-96231b3b80d8
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
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