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path: root/lib/CodeGen/PreAllocSplitting.cpp
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2009-07-12Fix assert(0) conversion, as suggested by Chris.Torok Edwin
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75423 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-11Convert more assert(0)+abort() -> LLVM_UNREACHABLE,Torok Edwin
and abort()/exit() -> llvm_report_error(). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75363 91177308-0d34-0410-b5e6-96231b3b80d8
2009-07-09Improved tracking of value number kills. VN kills are now representedLang Hames
as an (index,bool) pair. The bool flag records whether the kill is a PHI kill or not. This code will be used to enable splitting of live intervals containing PHI-kills. A slight change to live interval weights introduced an extra spill into lsr-code-insertion (outside the critical sections). The test condition has been updated to reflect this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75097 91177308-0d34-0410-b5e6-96231b3b80d8
2009-06-17VNInfo cleanup.Lang Hames
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73634 91177308-0d34-0410-b5e6-96231b3b80d8
2009-05-03In some rare cases, the register allocator can spill registers but end up ↵Evan Cheng
not utilizing registers at all. The fundamental problem is linearscan's backtracking can end up freeing more than one allocated registers. However, reloads and restores might be folded into uses / defs and freed registers might not be used at all. VirtRegMap keeps track of allocations so it knows what's not used. As a horrible hack, the stack coloring can color spill slots with *free* registers. That is, it replace reload and spills with copies from and to the free register. It unfold instructions that load and store the spill slot and replace them with register using variants. Not yet enabled. This is part 1. More coming. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70787 91177308-0d34-0410-b5e6-96231b3b80d8
2009-04-09Fix pr3954. The register scavenger asserts for inline assembly withBob Wilson
register destinations that are tied to source operands. The TargetInstrDescr::findTiedToSrcOperand method silently fails for inline assembly. The existing MachineInstr::isRegReDefinedByTwoAddr was very close to doing what is needed, so this revision makes a few changes to that method and also renames it to isRegTiedToUseOperand (for consistency with the very similar isRegTiedToDefOperand and because it handles both two-address instructions and inline assembly with tied registers). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68714 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-31Remove the "fast" cases for spill and restore point determination, as these ↵Owen Anderson
were subtlely wrong in obscure cases. Patch the testcase to account for this change. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68093 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-14Give the pre-alloc splitter access to the VirtRegMap. It doesn't do anythingOwen Anderson
useful with it at the moment, but it will in the future. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67012 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-05(Hopefully) silence a warning.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66158 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-05Be more careful about choosing restore points when doing restore folding. ↵Owen Anderson
This fixes some subtle miscompilations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66147 91177308-0d34-0410-b5e6-96231b3b80d8
2009-03-04Add a restore folder, which shaves a dozen or so machineinstrs off oggenc. ↵Owen Anderson
Update a testcase to check this. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66029 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-20Fix a crash in the pre-alloc splitter exposed by recent codegen changes.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@65121 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-06Add TargetInstrInfo::isSafeToMoveRegisterClassDefs. It returns true if it's ↵Evan Cheng
safe to move an instruction which defines a value in the register class. Replace pre-splitting specific IgnoreRegisterClassBarriers with this new hook. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63936 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-05Pre-alloc splitting needs to be more careful to avoid inserting spills/restoresOwen Anderson
between call frame setup/restore points. Unfortunately, this regresses code size a bit, but at least it's correct now! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63837 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-02MergeValueInto is too smart: it might choose to do the merge the opposite ↵Owen Anderson
direction. Live interval reconstruction needs to account for this, and scour its maps to prevent dangling references. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63558 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-02Refactor PerformPHIConstruction, no functionality changes.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63536 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-01Fix test failures causes by my previous commit.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63492 91177308-0d34-0410-b5e6-96231b3b80d8
2009-02-01Fix an issue in PHI construction that was exposed by GCC 4.2 producing a ↵Owen Anderson
different set iteration order for the reg_iterator. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63490 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-29Correct the algorithms for choosing spill and restore points so that we ↵Owen Anderson
don't try to insert loads/stores between call frame setup and the actual call. This fixes the last known failure for the pre-alloc-splitter. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63339 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-29Fix an issue where restores could be inserted after a terminator instruction,Owen Anderson
and an iterator invalidation issue. FreeBench/pifft no longer miscompiles with these fixes! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63293 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-29Comments are good. :-)Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63276 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-29Add support for aggressive load-use-store folding. This takes care of the Owen Anderson
vast majority of code size regressions introduced by pre-alloc-splitting. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63274 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-27Make the pre-split-limit option more useful by using a per-function counter.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63091 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-26Reapply r63025 and r63026, with fixes for the failing testcases.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63049 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-26Also revert r63206Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63041 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-26Temporarily revert r63025 until the testsuite failures can be fixed.Bill Wendling
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63040 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-26Get rid of a bunch of dead code now that interval reconstruction is enabled.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63026 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-26Fix an issue where LiveIntervals was trying to be smart about removing killOwen Anderson
markers, and ended up foiling the interval reconstruction. This allows us to turn on reconstruction in the pre alloc splitter, which fixes a number of miscompilations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63025 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-26Silence a bogus compiler warning.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@63021 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-24Some cleanups. No functional changes.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62917 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-23Stage two of fixing pre-alloc-splitting's code size issues: filter out ↵Owen Anderson
restores that are just going to be re-spilled again. This also helps performance. Pre-alloc-splitting now seems to be an overall win on SPEC. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62834 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-23Add an initial pass at dead spill/restore removal for pre alloc splitting.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62821 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-21I accidentally removed this check in an earlier commit, which cause breakage ↵Owen Anderson
in the pre alloc splitter. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62678 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-21Be more aggressive about renumbering vregs after splitting them.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62639 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-20Change TargetInstrInfo::isMoveInstr to return source and destination ↵Evan Cheng
sub-register indices as well. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62600 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-12More two-address fixes. This gets lua working with join-creation enabled.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@62073 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-06The phi construction algorithm used for interval reconstruction is ↵Owen Anderson
complicated by two address instructions. We need to keep track of things we've processed AS USES independetly of whether we've processed them as defs. This fixes all known miscompilations when reconstruction is turned on. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61802 91177308-0d34-0410-b5e6-96231b3b80d8
2009-01-05Get rid of sentinel insertion in interval reconstruction. It just masked theOwen Anderson
problem, rather than fixing it. The problem has now been fixed the right way. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61723 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-31Get live interval reconstruction several steps closer to working.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61514 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-29Add braces, as suggested by a gcc warning.Duncan Sands
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61465 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-28Fix up kill/dead marking in the new live interval reconstruction code.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61460 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-28Add prototype code for recomputing a live interval's ranges and valnos ↵Owen Anderson
through recursive phi construction. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61458 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-18Re-apply r61158 in a form that no longer breaks tests.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61182 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-17Revert r61158 for now, as it caused some test failures.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61159 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-17Fix miscompilations caused by renumbering, and enable it as part of prealloc ↵Owen Anderson
splitting. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61158 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-16Add code to renumber split intervals into new vregs. This is disabled for ↵Owen Anderson
now until I finish working out some iterator invalidation issues. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61104 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-07Switch to top-down mode and fix a crasher this exposed caused by an error in theOwen Anderson
live interval updating. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60652 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-04Factor out some common code.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60553 91177308-0d34-0410-b5e6-96231b3b80d8
2008-12-02Add support for folding spills into preceding defs when doing pre-alloc ↵Owen Anderson
splitting. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@60433 91177308-0d34-0410-b5e6-96231b3b80d8
2008-11-19Add support for rematerialization in pre-alloc-splitting.Owen Anderson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59587 91177308-0d34-0410-b5e6-96231b3b80d8
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