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2004-02-24Move machine code rewriter and spiller outside the registerAlkis Evlogimenos
allocator. The implementation is completely rewritten and now employs several optimizations not exercised before. For example for 164.gzip we have 997 loads and 699 stores vs the 1221 loads and 880 stores we have before. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11798 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-24Add predicates for checking if a virtual register has a physicalAlkis Evlogimenos
register mapping or a stack slot mapping. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11795 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Make enum private as it is an implementation detail.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11782 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Remove '4Virt' from member function names as it is obvious.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11781 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Refactor VirtRegMap out of RegAllocLinearScan as the first part of bugAlkis Evlogimenos
251 (providing a generic machine code rewriter/spiller). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11780 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Add number of spilled registers statistic.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11759 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Fix bugs in finegrainificationChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11758 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Finegrainify namespacificationChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11757 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Use MachineBasicBlock::getParent().Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11756 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Remove implementation of default constructor as it is useless now.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11755 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Refactor rewinding code for finding the first terminator of a basicAlkis Evlogimenos
block into MachineBasicBlock::getFirstTerminator(). This also fixes a bug in the implementation of the above in both RegAllocLocal and InstrSched, where instructions where added after the terminator if the basic block's only instruction was a terminator (it shouldn't matter for RegAllocLocal since this case never occurs in practice). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11748 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Improved PhysRegTracker interface. RegAlloc lazily allocates the register ↵Alkis Evlogimenos
tracker using a std::auto_ptr git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11738 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Simplify iterator usage now that we have next(). Also don't pass iterators ↵Alkis Evlogimenos
by reference now that MachineInstr* are in an ilist git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11732 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Some code cleanups from ChrisAlkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11724 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Fix comments in PhysRegTracker and rename isPhysRegAvail to isRegAvail to be ↵Alkis Evlogimenos
consistent with the other two git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11723 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Move LiveIntervals.h up to be the first included headerAlkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11721 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Pull PhysRegTracker out of RegAllocLinearScan as it can be used by other ↵Alkis Evlogimenos
allocators as well git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11720 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-23Move LiveIntervals.h to lib/CodeGen since it shouldn't be exposed to other ↵Alkis Evlogimenos
parts of the compiler git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11719 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-22Another bug fix for empty MBB'sChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11716 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-22Fix a bug where we were implicitly assuming that there would be at leastChris Lattner
one terminator instruction in each basic block. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11714 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-22Print basic block boundaries in machine instruction debug output.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11704 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-22Abstract merging of ranges away from number of slots per instruction.Alkis Evlogimenos
Also make it less aggressive as the current implementation breaks in some cases. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11696 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-21Make 'fold' statistic's description the same in both allocators.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11687 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-20Some more statistics improvements.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11676 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-20Disambiguate statistic descriptions.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11675 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-20Rename statistic and add another one.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11674 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-20Fix crash in debug output.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11659 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-20Fix instruction numbering in debug output.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11655 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-20Too many changes in one commit:Alkis Evlogimenos
1. LiveIntervals now implement a 4 slot per instruction model. Load, Use, Def and a Store slot. This is required in order to correctly represent caller saved register clobbering on function calls, register reuse in the same instruction (def resues last use) and also spill code added later by the allocator. The previous representation (2 slots per instruction) was insufficient and as a result was causing subtle bugs. 2. Fixes in spill code generation. This was the major cause of failures in the test suite. 3. Linear scan now has core support for folding memory operands. This is untested and not enabled (the live interval update function does not attempt to fold loads/stores in instructions). 4. Lots of improvements in the debugging output of both live intervals and linear scan. Give it a try... it is beautiful :-) In summary the above fixes all the issues with the recent reserved register elimination changes and get the allocator very close to the next big step: folding memory operands. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11654 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-19Fix RA::verifyAssignment()Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11629 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-19Fix problem fusing spill code into instructions: we didn't update the liveChris Lattner
variable information to take into account the change of instruction address. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11628 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-19Fix an iterator invalidation problem. :(Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11627 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-19Add method to update livevar when an instruction movesChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11625 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-19Fix a __LONG__ term annoyance of mine: symbolic registers weren't being printedChris Lattner
by operator<< on MachineInstr's, and looking up what register "24" is all of the time was greatly annoying. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11623 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-19Add a MachineBasicBlock::getParent() methodChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11622 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-19Rename reloads/spills to loads/stores.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11619 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-18Implement assignment correctness verification.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11609 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-18Move unused typedefs in private section. Add method to return intervalAlkis Evlogimenos
given a register. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11608 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-18Eliminate operator[] is deprecated warningsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11578 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-18Fix deprecated operator[] warningsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11577 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-18Be more agressive when joining ranges.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11575 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-18Fix overly conservative spill interval computation.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11574 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-18Beautify debug output.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11573 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-17Remove the -disable-kill option. The register allocator is buggy with it,Chris Lattner
and it was only for debugging in the first place. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11557 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-17Add support to the local allocator for fusing spill code into the instructionsChris Lattner
that need them. This is very useful on CISCy targets like the X86 because it reduces the total spill pressure, and makes better use of it's (large) instruction set. Though the X86 backend doesn't know how to rewrite many instructions yet, this already makes a substantial difference on 176.gcc for example: Before: Time: 8.0099 ( 31.2%) 0.0100 ( 12.5%) 8.0199 ( 31.2%) 7.7186 ( 30.0%) Local Register Allocator Code quality: 734559 asm-printer - Number of machine instrs printed 111395 ra-local - Number of registers reloaded 79902 ra-local - Number of registers spilled 231554 x86-peephole - Number of peephole optimization performed After: Time: 7.8700 ( 30.6%) 0.0099 ( 19.9%) 7.8800 ( 30.6%) 7.7892 ( 30.2%) Local Register Allocator Code quality: 733083 asm-printer - Number of machine instrs printed 2379 ra-local - Number of reloads fused into instructions 109046 ra-local - Number of registers reloaded 79881 ra-local - Number of registers spilled 230658 x86-peephole - Number of peephole optimization performed So by fusing 2300 instructions, we reduced the static number of instructions by 1500, and reduces the number of peepholes (and thus the work) by about 900. This also clearly reduces the number of reload/spill instructions that are emitted. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11542 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-17Fix a bug in my previous refactoring change... arg!Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11535 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-17Add LiveIntervals::Interval::empty() member function.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11520 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-17Once we have a way to fold spill code reloads into instructions, we have a ↵Chris Lattner
way to use it. :) git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11517 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-17Fix spilled interval update. It was too conservative.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11516 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-17Refactor code a bit. No functionality changes, though the comment hints at ↵Chris Lattner
things to come. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11515 91177308-0d34-0410-b5e6-96231b3b80d8
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