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path: root/lib/CodeGen/MachineCSE.cpp
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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
2010-07-03Detect and handle COPY in many places.Jakob Stoklund Olesen
This code is transitional, it will soon be possible to eliminate isExtractSubreg, isInsertSubreg, and isMoveInstr in most places. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107547 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-04Re-apply 105308 with fix.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105502 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-03Revert 105308.Bob Wilson
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105399 91177308-0d34-0410-b5e6-96231b3b80d8
2010-06-02Enable machine cse of instructions which define physical registers.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105308 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-21Make this LookAheadLimit, not the uninitialized LookAheadLeft.Eric Christopher
Evan please verify! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104408 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-21Allow machine cse to cse instructions which define physical registers. ↵Evan Cheng
Controlled by option -machine-cse-phys-defs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104385 91177308-0d34-0410-b5e6-96231b3b80d8
2010-05-13Add a utility function for conservatively clearing kill flags, and makeDan Gohman
use of it in MachineCSE. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103726 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-21Rewrite machine cse to avoid recursion.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101964 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-20Typo.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@101914 91177308-0d34-0410-b5e6-96231b3b80d8
2010-04-02After trivial coalescing, the MI being visited may have become a copy. Avoid ↵Evan Cheng
adding it to CSE hash table since copies aren't being considered for CSE and they may be deleted. rdar://7819990 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@100170 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-24dbg_value may end a block.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99378 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-23Code clean up.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@99319 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-11Fix debug_value handling.Dale Johannesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98224 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-10Add a couple more heuristics to neuter machine cse some more.Evan Cheng
1. Be careful with cse "cheap" expressions. e.g. constant materialization. Only cse them when the common expression is local or in a direct predecessor. We don't want cse of cheap instruction causing other expressions to be spilled. 2. Watch out for the case where the expression doesn't itself uses a virtual register. e.g. lea of frame object. If the common expression itself is used by copies (common for passing addresses to function calls), don't perform the cse. Since these expressions do not use a register, it creates a live range but doesn't close any, we want to be very careful with increasing register pressure. Note these are heuristics so machine cse doesn't make register allocator unhappy. Once we have proper live range splitting and re-materialization support in place, these should be evaluated again. Now machine cse is almost always a win on llvm nightly tests on x86 and x86_64. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98121 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-09Allow more cross-rc coalescing.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98048 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-09Don't do illegal cross-class coalescing.Jakob Stoklund Olesen
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98044 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-09- Make the machine cse dumb coalescer (as opposed to the more awesome simpleEvan Cheng
coalescer) handle sub-register classes. - Add heuristics to avoid non-profitable cse. Given the current lack of live range splitting, avoid cse when an expression has PHI use and the would be new use is in a BB where the expression wasn't already being used. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98043 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-08Don't waste time trying to CSE labels, phis, inline asm. Definitely avoid ↵Evan Cheng
cse implicit-def for obvious performance reason. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98009 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-08Restrict machine cse to really trivial coalescing. Leave the heavy lifting ↵Evan Cheng
to a real coalescer. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@98007 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-06Don't update physical register def.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97861 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-04Avoid cse load instructions unless they are known to be invariant loads.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97747 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-04Look ahead a bit to determine if a physical register def that is not marked ↵Evan Cheng
dead is really alive. This is necessary to catch a lot of common cse opportunities for targets like x86. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97706 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-03Fix a logic error. An instruction that has a live physical register def ↵Evan Cheng
cannot be CSE'ed, but it *can* be used to replace a common subexpression. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97688 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-03Re-apply r97667 but with a little bit of thought put into the patch. This ↵Evan Cheng
implements a special DenseMapInfo trait for DenseMap<MachineInstr*> that compare the value of the MachineInstr rather than the pointer value. Since the hashing and equality test functions ignore defs it's useful for doing CSE kind optimization. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97678 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-03Revert 97667. It broke a bunch of tests.Dan Gohman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97673 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-03Move DenseMapInfo for MachineInstr* to MachineInstr.hEvan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97667 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-03Machine CSE work in progress. It's doing some CSE now. But implicit def of ↵Evan Cheng
physical registers are getting in the way. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97664 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-03Work in progress. Finding some cse now.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97635 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-02Fix typo.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97577 91177308-0d34-0410-b5e6-96231b3b80d8
2010-03-02Add skeleton of a machine level cse pass.Evan Cheng
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97543 91177308-0d34-0410-b5e6-96231b3b80d8
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