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path: root/lib/CodeGen/LowerSubregs.cpp
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* Rename LowerSubregs to ExpandPostRAPseudos.Jakob Stoklund Olesen2011-09-251-223/+0
| | | | | | | | | | | | | | I'll fix the file contents in the next commit. This pass is currently expanding the COPY and SUBREG_TO_REG pseudos. I am going to add a hook so targets can expand more pseudo-instructions after register allocation. Many targets have pseudo-instructions that assist the register allocator. They can be expanded after register allocation, before PEI and PostRA scheduling. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@140469 91177308-0d34-0410-b5e6-96231b3b80d8
* Trailing whitespace.Jim Grosbach2011-02-251-5/+5
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126526 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove unused functions.Jakob Stoklund Olesen2010-08-161-20/+0
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111156 91177308-0d34-0410-b5e6-96231b3b80d8
* Reapply r110396, with fixes to appease the Linux buildbot gods.Owen Anderson2010-08-061-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110460 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert r110396 to fix buildbots.Owen Anderson2010-08-061-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110410 91177308-0d34-0410-b5e6-96231b3b80d8
* Don't use PassInfo* as a type identifier for passes. Instead, use the ↵Owen Anderson2010-08-051-1/+1
| | | | | | | | | 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
* Convert EXTRACT_SUBREG to COPY when emitting machine instrs.Jakob Stoklund Olesen2010-07-081-55/+3
| | | | | | | | | 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
* Remove references to INSERT_SUBREG after de-SSA.Jakob Stoklund Olesen2010-07-081-82/+1
| | | | | | | Fix X86InstrInfo::convertToThreeAddressWithLEA to generate COPY instead of INSERT_SUBREG. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107878 91177308-0d34-0410-b5e6-96231b3b80d8
* Add TargetInstrInfo::copyPhysReg hook and use it from LowerSubregs.Jakob Stoklund Olesen2010-07-081-36/+8
| | | | | | | | | This target hook is intended to replace copyRegToReg entirely, but for now it calls copyRegToReg. Any remaining calls to copyRegToReg wil be replaced by COPY instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107854 91177308-0d34-0410-b5e6-96231b3b80d8
* Revert "Remove references to INSERT_SUBREG after de-SSA" r107725.Jakob Stoklund Olesen2010-07-071-1/+87
| | | | | | Buildbot breakage. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107744 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove references to INSERT_SUBREG after de-SSAJakob Stoklund Olesen2010-07-061-87/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107732 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a new target independent COPY instruction and code to lower it.Jakob Stoklund Olesen2010-07-021-0/+49
| | | | | | | | | | | The COPY instruction is intended to replace the target specific copy instructions for virtual registers as well as the EXTRACT_SUBREG and INSERT_SUBREG instructions in MachineFunctions. It won't we used in a selection DAG. COPY is lowered to native register copies by LowerSubregs. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107529 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix a register scavenger crash when dealing with undefined subregs.Bob Wilson2010-06-291-0/+18
| | | | | | | | The LowerSubregs pass needs to preserve implicit def operands attached to EXTRACT_SUBREG instructions when it replaces those instructions with copies. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@107189 91177308-0d34-0410-b5e6-96231b3b80d8
* Also convert SUBREG_TO_REG to a KILL when relevant, like the other subregJakob Stoklund Olesen2010-06-221-7/+12
| | | | | | | | | instructions. This does not affect codegen much because SUBREG_TO_REG is only used by X86 and X86 does not use the register scavenger, but it prevents verifier errors. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@106583 91177308-0d34-0410-b5e6-96231b3b80d8
* Add a DebugLoc argument to TargetInstrInfo::copyRegToReg, so that itDan Gohman2010-05-061-3/+6
| | | | | | | doesn't have to guess. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103194 91177308-0d34-0410-b5e6-96231b3b80d8
* move target-independent opcodes out of TargetInstrInfoChris Lattner2010-02-091-6/+6
| | | | | | | | | | into TargetOpcodes.h. #include the new TargetOpcodes.h into MachineInstr. Add new inline accessors (like isPHI()) to MachineInstr, and start using them throughout the codebase. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@95687 91177308-0d34-0410-b5e6-96231b3b80d8
* Change errs() to dbgs().David Greene2010-01-041-13/+13
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@92535 91177308-0d34-0410-b5e6-96231b3b80d8
* improve portability to avoid conflicting with std::next in c++'0x.Chris Lattner2009-12-031-1/+1
| | | | | | | Patch by Howard Hinnant! git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@90365 91177308-0d34-0410-b5e6-96231b3b80d8
* Code clean up.Evan Cheng2009-10-251-33/+33
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85046 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove includes of Support/Compiler.h that are no longer needed after theNick Lewycky2009-10-251-1/+0
| | | | | | | VISIBILITY_HIDDEN removal. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85043 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove VISIBILITY_HIDDEN from class/struct found inside anonymous namespaces.Nick Lewycky2009-10-251-2/+1
| | | | | | | | Chris claims we should never have visibility_hidden inside any .cpp file but that's still not true even after this commit. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@85042 91177308-0d34-0410-b5e6-96231b3b80d8
* Add some asserts to catch copyRegToReg() fails earlyAnton Korobeynikov2009-10-241-4/+9
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84983 91177308-0d34-0410-b5e6-96231b3b80d8
* Use KILL instead of IMPLICIT_DEF in LowerSubregs pass.Jakob Stoklund Olesen2009-09-281-11/+10
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@83007 91177308-0d34-0410-b5e6-96231b3b80d8
* Minor bug fix. LowerSubregs should translate Evan Cheng2009-09-221-0/+1
| | | | | | | | | | | %S0<def> = EXTRACT_SUBREG %Q0<kill>, 1 to %S0<def> = IMPLICIT_DEF %Q0<imp-use,kill> Implicit_def does not *read* any register so the operand should be marked "implicit". The missing "implicit" marker on the operand is wrong, but it doesn't actually break anything. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82503 91177308-0d34-0410-b5e6-96231b3b80d8
* Convert DOUT to DEBUG(errs()...).Bill Wendling2009-08-221-30/+27
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@79753 91177308-0d34-0410-b5e6-96231b3b80d8
* Remove RegisterScavenger::isSuperRegUsed(). This completely reverses the ↵Jakob Stoklund Olesen2009-08-081-6/+7
| | | | | | | | | | | | | | | | mistaken commit r77904. Now there is no special treatment of instructions that redefine part of a super-register. Instead, the super-register is marked with <imp-use,kill> and <imp-def>. For instance, from LowerSubregs on ARM: subreg: CONVERTING: %Q1<def> = INSERT_SUBREG %Q1<undef>, %D1<kill>, 5 subreg: %D2<def> = FCPYD %D1<kill>, 14, %reg0, %Q1<imp-def> subreg: CONVERTING: %Q1<def> = INSERT_SUBREG %Q1, %D0<kill>, 6 subreg: %D3<def> = FCPYD %D0<kill>, 14, %reg0, %Q1<imp-use,kill>, %Q1<imp-def> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78466 91177308-0d34-0410-b5e6-96231b3b80d8
* Turn some insert_subreg, extract_subreg, subreg_to_reg into implicit_defs.Evan Cheng2009-08-051-0/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78151 91177308-0d34-0410-b5e6-96231b3b80d8
* One more. Transfer kill of the larger register when lowering an EXTRACT_SUBREG.Evan Cheng2009-08-051-4/+6
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78145 91177308-0d34-0410-b5e6-96231b3b80d8
* One more place where subreg lowering forgot to transfer undefness.Evan Cheng2009-08-051-3/+6
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78144 91177308-0d34-0410-b5e6-96231b3b80d8
* If the insert_subreg source is <undef>, insert an implicit_def instead of a ↵Evan Cheng2009-08-051-2/+8
| | | | | | copy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78141 91177308-0d34-0410-b5e6-96231b3b80d8
* LowerSubregsInstructionPass::LowerExtract should not extend the live range ↵Jakob Stoklund Olesen2009-08-041-14/+11
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | of registers. When LowerExtract eliminates an EXTRACT_SUBREG with a kill flag, it moves the kill flag to the place where the sub-register is killed. This can accidentally overlap with the use of a sibling sub-register, and we have trouble. In the test case we have this code: Live Ins: %R0 %R1 %R2 %R2L<def> = EXTRACT_SUBREG %R2<kill>, 1 %R2H<def> = LOAD16fi <fi#-1>, 0, Mem:LD(2,4) [FixedStack-1 + 0] %R1L<def> = EXTRACT_SUBREG %R1<kill>, 1 %R0L<def> = EXTRACT_SUBREG %R0<kill>, 1 %R0H<def> = ADD16 %R2H<kill>, %R2L<kill>, %AZ<imp-def>, %AN<imp-def>, %AC0<imp-def>, %V<imp-def>, %VS<imp-def> subreg: CONVERTING: %R2L<def> = EXTRACT_SUBREG %R2<kill>, 1 subreg: eliminated! subreg: killed here: %R0H<def> = ADD16 %R2H, %R2L, %R2<imp-use,kill>, %AZ<imp-def>, %AN<imp-def>, %AC0<imp-def>, %V<imp-def>, %VS<imp-def> The kill flag on %R2 is moved to the last instruction, and the live range overlaps with the definition of %R2H: *** Bad machine code: Redefining a live physical register *** - function: f - basic block: 0x18358c0 (#0) - instruction: %R2H<def> = LOAD16fi <fi#-1>, 0, Mem:LD(2,4) [FixedStack-1 + 0] Register R2H was defined but already live. The fix is to replace EXTRACT_SUBREG with IMPLICIT_DEF instead of eliminating it completely: subreg: CONVERTING: %R2L<def> = EXTRACT_SUBREG %R2<kill>, 1 subreg: replace by: %R2L<def> = IMPLICIT_DEF %R2<kill> Note that these IMPLICIT_DEF instructions survive to the asm output. It is necessary to fix the stack-color-with-reg test case because of that. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78093 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix Bug 4657: register scavenger asserts with subreg loweringJakob Stoklund Olesen2009-08-031-8/+31
| | | | | | | | | | | | | | | When LowerSubregsInstructionPass::LowerInsert eliminates an INSERT_SUBREG instriction because it is an identity copy, make sure that the same registers are alive before and after the elimination. When the super-register is marked <undef> this requires inserting an IMPLICIT_DEF instruction to make sure the super register is live. Fix a related bug where a kill flag on the inserted sub-register was not transferred properly. Finally, clear the undef flag in MachineInstr::addRegisterKilled. Undef implies dead and kill implies live, so they cant both be valid. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77989 91177308-0d34-0410-b5e6-96231b3b80d8
* Use setPreservesAll and setPreservesCFG in CodeGen passes.Dan Gohman2009-07-311-0/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77754 91177308-0d34-0410-b5e6-96231b3b80d8
* More migration to raw_ostream, the water has dried up around the iostream hole.Daniel Dunbar2009-07-251-1/+3
| | | | | | | | | | | - Some clients which used DOUT have moved to DEBUG. We are deprecating the "magic" DOUT behavior which avoided calling printing functions when the statement was disabled. In addition to being unnecessary magic, it had the downside of leaving code in -Asserts builds, and of hiding potentially unnecessary computations. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77019 91177308-0d34-0410-b5e6-96231b3b80d8
* Let RegisterInfo decide whether it can emit cross-class copy or notAnton Korobeynikov2009-07-161-4/+5
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75955 91177308-0d34-0410-b5e6-96231b3b80d8
* Do not fold away subreg_to_reg if the source register has a sub-register ↵Evan Cheng2009-03-231-3/+9
| | | | | | | | | | | index. That means the source register is taking a sub-register of a larger register. e.g. On x86 %RAX<def> = ... %RAX<def> = SUBREG_TO_REG 0, %EAX:3<kill>, 3 The first def is defining RAX, not EAX so the top bits were not zero-extended. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@67511 91177308-0d34-0410-b5e6-96231b3b80d8
* Teach LowerSubregs to preserve kill/dead information when loweringDan Gohman2008-12-181-1/+63
| | | | | | | subreg instructions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61220 91177308-0d34-0410-b5e6-96231b3b80d8
* Make LowerSubregs' debug output for EXTRACT_SUBREG consistent withDan Gohman2008-12-181-1/+6
| | | | | | | that of INSERT_SUBREG and SUBREG_TO_REG. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61218 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix a copy+pasto in an assertion message.Dan Gohman2008-12-181-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61217 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix indentation level.Dan Gohman2008-12-181-33/+33
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@61216 91177308-0d34-0410-b5e6-96231b3b80d8
* Silence unused variable warnings.Devang Patel2008-11-211-0/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@59841 91177308-0d34-0410-b5e6-96231b3b80d8
* Switch the MachineOperand accessors back to the short names likeDan Gohman2008-10-031-11/+11
| | | | | | | isReg, etc., from isRegister, etc. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@57006 91177308-0d34-0410-b5e6-96231b3b80d8
* Give LowerSubregs.cpp a top-level description.Dan Gohman2008-09-241-0/+7
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56596 91177308-0d34-0410-b5e6-96231b3b80d8
* Instead of setPreservesAll, just mark them preseving machine loop info and ↵Evan Cheng2008-09-221-1/+2
| | | | | | machine dominators. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56475 91177308-0d34-0410-b5e6-96231b3b80d8
* Mark several codegen passes as preserving all analysis.Evan Cheng2008-09-221-0/+5
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56469 91177308-0d34-0410-b5e6-96231b3b80d8
* Tidy up several unbeseeming casts from pointer to intptr_t.Dan Gohman2008-09-041-1/+1
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55779 91177308-0d34-0410-b5e6-96231b3b80d8
* Fix indentation.Dan Gohman2008-08-201-2/+2
| | | | git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@55049 91177308-0d34-0410-b5e6-96231b3b80d8
* Re-enable elimination of unnecessary SUBREG_TO_REG instructions inDan Gohman2008-08-071-4/+9
| | | | | | | | | | | | LowerSubregs, and fix an x86-64 isel bug that this exposed. SUBREG_TO_REG for x86-64 implicit zero extension is only safe for isel to generate when the source is known to always have zeros in the high 32 bits. The EXTRACT_SUBREG instruction does not clear the high 32 bits. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54444 91177308-0d34-0410-b5e6-96231b3b80d8
* Re-introduce LeakDetector support for MachineInstrs and MachineBasicBlocks.Dan Gohman2008-07-171-3/+3
| | | | | | | | Fix a leak that this turned up in LowerSubregs.cpp. And, comment a leak in LiveIntervalAnalysis.cpp. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@53746 91177308-0d34-0410-b5e6-96231b3b80d8
* It's not safe to remove SUBREG_TO_REG that looks like identity copies, e.g. ↵Evan Cheng2008-06-171-11/+6
| | | | | | movl %eax, %eax on x86-64 actually does a zero-extend. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52421 91177308-0d34-0410-b5e6-96231b3b80d8
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