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path: root/lib/CodeGen/RegAllocLinearScan.cpp
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2011-11-12Delete the linear scan register allocator.Jakob Stoklund Olesen
RegAllocGreedy has been the default for six months now. Deleting RegAllocLinearScan makes it possible to also delete VirtRegRewriter and clean up the spiller code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144475 91177308-0d34-0410-b5e6-96231b3b80d8
2011-08-09Refer to the RegisterCoalescer pass by ID.Jakob Stoklund Olesen
A public interface is no longer needed since RegisterCoalescer is not an analysis any more. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@137082 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-27Remove the experimental (and unused) pre-ra splitting pass. Greedy regalloc ↵Evan Cheng
can split live ranges. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133962 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-26There is only one register coalescer. Merge it into the base class andRafael Espindola
remove the analysis group. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133899 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-26Move RegisterCoalescer.h to lib/CodeGen.Rafael Espindola
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133895 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-17Only call TRI::getRawAllocationOrder to resolve a target-dependent hint.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133313 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-16Rename TRI::getAllocationOrder() to getRawAllocationOrder().Jakob Stoklund Olesen
Also switch the return type to ArrayRef<unsigned> which works out nicely for ARM's implementation of this function because of the clever ArrayRef constructors. The name change indicates that the returned allocation order may contain reserved registers as has been the case for a while. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133216 91177308-0d34-0410-b5e6-96231b3b80d8
2011-06-16Switch linear scan to using RegisterClassInfo.Jakob Stoklund Olesen
This avoids the manual filtering of reserved registers and removes the dependency on allocation_order_begin(). Palliative care... git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@133177 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-23Remove unused STL header includes.Jay Foad
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130068 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-19Avoid write-after-write issue hazards for Cortex-A9.Bob Wilson
Add a avoidWriteAfterWrite() target hook to identify register classes that suffer from write-after-write hazards. For those register classes, try to avoid writing the same register in two consecutive instructions. This is currently disabled by default. We should not spill to avoid hazards! The command line flag -avoid-waw-hazard can be used to enable waw avoidance. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129772 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-15Fix a ton of comment typos found by codespell. Patch byChris Lattner
Luis Felipe Strano Moraes! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129558 91177308-0d34-0410-b5e6-96231b3b80d8
2011-04-04Allow coalescing with reserved physregs in certain cases:Jakob Stoklund Olesen
When a virtual register has a single value that is defined as a copy of a reserved register, permit that copy to be joined. These virtual register are usually copies of the stack pointer: %vreg75<def> = COPY %ESP; GR32:%vreg75 MOV32mr %vreg75, 1, %noreg, 0, %noreg, %vreg74<kill> MOV32mi %vreg75, 1, %noreg, 8, %noreg, 0 MOV32mi %vreg75<kill>, 1, %noreg, 4, %noreg, 0 CALLpcrel32 ... Coalescing these virtual registers early decreases register pressure. Previously, they were coalesced by RALinScan::attemptTrivialCoalescing after register allocation was completed. The lower register pressure causes the mcinst-lowering-cmp0.ll test case to fail because it depends on linear scan spilling a particular register. I am deleting 2008-08-05-SpillerBug.ll because it is counting the number of instructions emitted, and its revision history shows the 'correct' count being edited many times. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128845 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-25No functionality change. Fix up some whitespace and switch out "" for '' whenNick Lewycky
printing a single character. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128256 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-25Ignore special ARM allocation hints for unexpected register classes.Jakob Stoklund Olesen
Add an assertion to linear scan to prevent it from allocating registers outside the register class. <rdar://problem/9183021> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@128254 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-10Change the Spiller interface to take a LiveRangeEdit reference.Jakob Stoklund Olesen
This makes it possible to register delegates and get callbacks when the spiller edits live ranges. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127389 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-10Make SpillIs an optional pointer. Avoid creating a bunch of temporary ↵Jakob Stoklund Olesen
SmallVectors. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@127388 91177308-0d34-0410-b5e6-96231b3b80d8
2011-03-03Avoid comparing invalid slot indexes, and assert that it doesn't happen.Jakob Stoklund Olesen
The SlotIndex created by the default construction does not represent a position in the function, and it doesn't make sense to compare it to other indexes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126924 91177308-0d34-0410-b5e6-96231b3b80d8
2011-01-27Avoid modifying the OneClassForEachPhysReg map while iterating over it.Bob Wilson
Linear scan regalloc is currently assuming that any register aliased with a member of a regclass must also be in at least one regclass. That is not always true. For example, for X86, RIP is in a regclass but IP is not. If you're unlucky, this can cause a crash by invalidating the iterator. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@124365 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
2011-01-06Zap the last two -Wself-assign warnings in llvm.Jakob Stoklund Olesen
Simplify RALinScan::DowngradeRegister with TRI::getOverlaps while we are there. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122940 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-23Change all self assignments X=X to (void)X, so that we can turn on aJeffrey Yasskin
new gcc warning that complains on self-assignments and self-initializations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122458 91177308-0d34-0410-b5e6-96231b3b80d8
2010-12-03Emit DBG_VALUE instructions from LiveDebugVariables.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@120842 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-19Don't attempt trivial coalescing for sub-register copies.Jakob Stoklund Olesen
Patch by Krister Wombell! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119791 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-16Print out the register class of the current interval.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@119374 91177308-0d34-0410-b5e6-96231b3b80d8
2010-11-10Hook up AliasAnalysis in InlineSpiller. This is used for rematerializingJakob Stoklund Olesen
constant loads. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@118741 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-28Make MachineDominators available for SplitEditor. We are going to need it forJakob Stoklund Olesen
proper SSA updating. This doesn't cause MachineDominators to be recomputed since we are already requiring MachineLoopInfo which uses dominators as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117598 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-26Make the spiller responsible for updating the LiveStacks analysis.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@117337 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-19Get rid of static constructors for pass registration. Instead, every pass ↵Owen Anderson
exposes an initializeMyPassFunction(), which must be called in the pass's constructor. This function uses static dependency declarations to recursively initialize the pass's dependencies. Clients that only create passes through the createFooPass() APIs will require no changes. Clients that want to use the CommandLine options for passes will need to manually call the appropriate initialization functions in PassInitialization.h before parsing commandline arguments. I have tested this with all standard configurations of clang and llvm-gcc on Darwin. It is possible that there are problems with the static dependencies that will only be visible with non-standard options. If you encounter any crash in pass registration/creation, please send the testcase to me directly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116820 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-12Begin adding static dependence information to passes, which will allow us toOwen Anderson
perform initialization without static constructors AND without explicit initialization by the client. For the moment, passes are required to initialize both their (potential) dependencies and any passes they preserve. I hope to be able to relax the latter requirement in the future. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116334 91177308-0d34-0410-b5e6-96231b3b80d8
2010-10-07Now with fewer extraneous semicolons!Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@115996 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-25Removed VNInfo::isDefAccurate(). Def "accuracy" can be checked by testing ↵Lang Hames
whether LiveIntervals::getInstructionFromIndex(def) returns NULL. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@114791 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-01Tweak to ignoring reserved regs. The allocator was occasionally still lookingJim Grosbach
at them since they'd end up in the register weights list. Tell it to stop doing that. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112756 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-01tidy up trailing whitespace and an 80 column violation.Jim Grosbach
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112746 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-01cleanup per feedback. use a helper function for getting the first non-reservedJim Grosbach
physical register in a register class. Make sure to assert if the register class is empty. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112743 91177308-0d34-0410-b5e6-96231b3b80d8
2010-09-01The register allocator shouldn't consider allocating reserved registers.Jim Grosbach
r112728 did this for fast regalloc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@112741 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-13Clean up the Spiller.h interface.Jakob Stoklund Olesen
The earliestStart argument is entirely specific to linear scan allocation, and can be easily calculated by RegAllocLinearScan. Replace std::vector with SmallVector. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111055 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-06Reapply r110396, with fixes to appease the Linux buildbot gods.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110460 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-06Revert r110396 to fix buildbots.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110410 91177308-0d34-0410-b5e6-96231b3b80d8
2010-08-05Don't use PassInfo* as a type identifier for passes. Instead, use the ↵Owen Anderson
address of the static ID member as the sole unique type identifier. Clean up APIs related to this change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110396 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-27GrammarJim Grosbach
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109525 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-21Fix batch of converting RegisterPass<> to INTIALIZE_PASS().Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109045 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-20Change the createSpiller interface to take a MachineFunctionPass argument.Jakob Stoklund Olesen
The spillers can pluck the analyses they need from the pass reference. Switch some never-null pointers to references. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108969 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-19Spillers may alter MachineLoopInfo when breaking critical edges, so make itJakob Stoklund Olesen
non-const. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108734 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-16Remove many calls to TII::isMoveInstr. Targets should be producing COPY anyway.Jakob Stoklund Olesen
TII::isMoveInstr is going tobe completely removed. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108507 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-08Convert EXTRACT_SUBREG to COPY when emitting machine instrs.Jakob Stoklund Olesen
EXTRACT_SUBREG no longer appears as a machine instruction. Use COPY instead. Add isCopy() checks in many places using isMoveInstr() and isExtractSubreg(). The isMoveInstr hook will be removed later. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107879 91177308-0d34-0410-b5e6-96231b3b80d8
2010-07-0280-col fixup.Eric Christopher
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107537 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
2010-05-15improve portability to systems that don't have powf/modf (e.g. solaris 9)Chris Lattner
patch by Evzen Muller! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103876 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-07rename llvm::llvm_report_error -> llvm::report_fatal_errorChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100709 91177308-0d34-0410-b5e6-96231b3b80d8
2010-02-26Remove dead codeJakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97261 91177308-0d34-0410-b5e6-96231b3b80d8
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