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path: root/lib/CodeGen/TwoAddressInstructionPass.cpp
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2006-09-05Fix a long-standing wart in the code generator: two-address instruction loweringChris Lattner
actually *removes* one of the operands, instead of just assigning both operands the same register. This make reasoning about instructions unnecessarily complex, because you need to know if you are before or after register allocation to match up operand #'s with the target description file. Changing this also gets rid of a bunch of hacky code in various places. This patch also includes changes to fold loads into cmp/test instructions in the X86 backend, along with a significant simplification to the X86 spill folding code. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@30108 91177308-0d34-0410-b5e6-96231b3b80d8
2006-08-27s|llvm/Support/Visibility.h|llvm/Support/Compiler.h|Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29911 91177308-0d34-0410-b5e6-96231b3b80d8
2006-07-20Reduce number of exported symbolsAndrew Lenharth
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29220 91177308-0d34-0410-b5e6-96231b3b80d8
2006-06-28Shave another 27K off libllvmgcc.dylib with visibility hiddenChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28973 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-24Patches to make the LLVM sources more -pedantic clean. Patch providedChris Lattner
by Anton Korobeynikov! This is a step towards closing PR786. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28447 91177308-0d34-0410-b5e6-96231b3b80d8
2006-05-04Move some methods out of MachineInstr into MachineOperandChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@28102 91177308-0d34-0410-b5e6-96231b3b80d8
2006-01-22Add explicit #includes of <iostream>Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@25515 91177308-0d34-0410-b5e6-96231b3b80d8
2005-10-26Fix some spello's pointed out by Gabor GreifChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24019 91177308-0d34-0410-b5e6-96231b3b80d8
2005-04-21Remove trailing whitespaceMisha Brukman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@21420 91177308-0d34-0410-b5e6-96231b3b80d8
2005-01-19Use the TargetInstrInfo::commuteInstruction method to commute instructionsChris Lattner
instead of doing it manually. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19685 91177308-0d34-0410-b5e6-96231b3b80d8
2005-01-02Make the 2-address instruction lowering pass smarter in two ways:Chris Lattner
1. If we are two-addressing a commutable instruction and the LHS is not the last use of the variable, see if the instruction is the last use of the RHS. If so, commute the instruction, allowing us to avoid a register-register copy in many cases for common instructions like ADD, OR, AND, etc on X86. 2. If #1 doesn't hold, and if this is an instruction that also existing in 3-address form, promote the instruction to a 3-address instruction to avoid the register-register copy. We can do this for several common instructions in X86, including ADDrr, INC, DEC, etc. This patch implements test/Regression/CodeGen/X86/commute-two-addr.ll, overlap-add.ll, and overlap-shift.ll when I check in the X86 support for it. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@19245 91177308-0d34-0410-b5e6-96231b3b80d8
2004-09-01Changes For Bug 352Reid Spencer
Move include/Config and include/Support into include/llvm/Config, include/llvm/ADT and include/llvm/Support. From here on out, all LLVM public header files must be under include/llvm/. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16137 91177308-0d34-0410-b5e6-96231b3b80d8
2004-08-15The insertion method returns void nowChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15779 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-22Fix indentation and wrap code at 80 colsMisha Brukman
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15107 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-22Remove extraneous punctuationChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15098 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-21Minor cleanupsChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15091 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-21These files don't need to include <iostream> since they include ↵Brian Gaeke
"Support/Debug.h". git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@15089 91177308-0d34-0410-b5e6-96231b3b80d8
2004-07-19Simplify the interface to LiveVariables::addVirtualRegister(Killed|Dead)Chris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14997 91177308-0d34-0410-b5e6-96231b3b80d8
2004-06-25Made a fix so that you can print out MachineInstrs that belong to a ↵Tanya Lattner
MachineBasicBlock that is not yet attached to a MachineFunction. This change includes changing the third operand (TargetMachine) to a pointer for the MachineInstr::print function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@14389 91177308-0d34-0410-b5e6-96231b3b80d8
2004-06-02Adjust to new TargetMachine interfaceChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@13956 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
2004-02-15This pass should not require phi elimination or live variableAlkis Evlogimenos
analysis. It should only preserve them and update LiveVariables if it already ran. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11479 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-14Use newly added next() and prior() utility functions.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11430 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-13Remove getAllocatedRegNum(). Use getReg() instead.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11393 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-12Change MachineBasicBlock's vector of MachineInstr pointers into anAlkis Evlogimenos
ilist of MachineInstr objects. This allows constant time removal and insertion of MachineInstr instances from anywhere in each MachineBasicBlock. It also allows for constant time splicing of MachineInstrs into or out of MachineBasicBlocks. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11340 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-05Added missing include.Tanya Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11129 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-04Modify the two address instruction pass to remove the duplicateAlkis Evlogimenos
operand of the instruction and thus simplify the register allocation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11124 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-02Revert changes. Will implement this using a different set of primitivesAlkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11091 91177308-0d34-0410-b5e6-96231b3b80d8
2004-02-02Correctly update def/use information for modified machine operands.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11087 91177308-0d34-0410-b5e6-96231b3b80d8
2004-01-31Fix, correctly this time, the computation of the return valueChris Lattner
Fix a spello Tighten up the assertion checking No functionality changes. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11036 91177308-0d34-0410-b5e6-96231b3b80d8
2004-01-31* Fix incorrect computation of the runOnMachineFunction return valueChris Lattner
* Turn a bunch of instance variables into automatic variables git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11035 91177308-0d34-0410-b5e6-96231b3b80d8
2004-01-31Remove unneeded #includesChris Lattner
Move Passes.h (which defines the interface to this file) to the top. Move statistics to the top of the file. Add a comment git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11034 91177308-0d34-0410-b5e6-96231b3b80d8
2004-01-11Make LiveVariables::HandlePhysRegUse andAlkis Evlogimenos
LiveVariables::HandlePhysRegDef private they use information that is not in memory when LiveVariables finishes the analysis. Also update the TwoAddressInstructionPass to not use this interface. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10755 91177308-0d34-0410-b5e6-96231b3b80d8
2004-01-05fix warningChris Lattner
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10692 91177308-0d34-0410-b5e6-96231b3b80d8
2004-01-05Currently we cannot handle two-address instructions of the form:Alkis Evlogimenos
A = B op C where A == C, but this cannot really occur in practice because of SSA form. Add an assert to check that just to be safe. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10682 91177308-0d34-0410-b5e6-96231b3b80d8
2004-01-04Update description.Alkis Evlogimenos
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10681 91177308-0d34-0410-b5e6-96231b3b80d8
2003-12-18Remove TwoAddressInstruction from the public headers and add an IDAlkis Evlogimenos
instead, since this pass doesn't expose any state to its users. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10520 91177308-0d34-0410-b5e6-96231b3b80d8
2003-12-18Add TwoAddressInstructionPass to handle instructions that have two orAlkis Evlogimenos
more operands and the two first operands are constrained to be the same. The pass takes an instruction of the form: a = b op c and transforms it into: a = b a = a op c and also preserves live variables. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10512 91177308-0d34-0410-b5e6-96231b3b80d8
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