Speculatively revert r123384 to make llvm-gcc-i386-linux-selfhost buildbot happy.

llvm-svn: 123389

Teach MachineBasicBlock::getFirstTerminator to ignore debug values.

It will still return an iterator that points to the first terminator or end(),
but there may be DBG_VALUE instructions following t

Teach MachineBasicBlock::getFirstTerminator to ignore debug values.

It will still return an iterator that points to the first terminator or end(),
but there may be DBG_VALUE instructions following the first terminator.

llvm-svn: 123384

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Add missing space in debug output

llvm-svn: 123351

Replace TargetRegisterInfo::printReg with a PrintReg class that also works without a TRI instance.

Print virtual registers numbered from 0 instead of the arbitrary
FirstVirtualRegister. The first vi

Replace TargetRegisterInfo::printReg with a PrintReg class that also works without a TRI instance.

Print virtual registers numbered from 0 instead of the arbitrary
FirstVirtualRegister. The first virtual register is printed as %vreg0.
TRI::NoRegister is printed as %noreg.

llvm-svn: 123107

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Don't try to split weird critical edges that really aren't:

BB#1: derived from LLVM BB %bb.nph28
Live Ins: %AL
Predecessors according to CFG: BB#0
TEST8rr %reg16384<kill>, %reg16384, %EFLAG

Don't try to split weird critical edges that really aren't:

BB#1: derived from LLVM BB %bb.nph28
Live Ins: %AL
Predecessors according to CFG: BB#0
TEST8rr %reg16384<kill>, %reg16384, %EFLAGS<imp-def>; GR8:%reg16384
JNE_4 <BB#2>, %EFLAGS<imp-use,kill>
JMP_4 <BB#2>
Successors according to CFG: BB#2 BB#2

These double CFG edges only ever occur in bugpoint-generated code, so there is
no need to attempt something clever.

llvm-svn: 117992

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Add SkipPHIsAndLabels from PHIElimination to MachineBasicBlock. It is needed
elsewhere.

llvm-svn: 117763

Teach MachineBasicBlock::print() to annotate instructions and blocks with
SlotIndexes when available.

llvm-svn: 117392

Properly update MachineDominators when splitting critical edge.

llvm-svn: 111574

Move the decision logic whether it's a good idea to split a critical edge to clients. Also fixed an erroneous check. An edge is only a back edge when the from and to blocks are in the same loop.

llv

Move the decision logic whether it's a good idea to split a critical edge to clients. Also fixed an erroneous check. An edge is only a back edge when the from and to blocks are in the same loop.

llvm-svn: 111256

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Fix debug message.

llvm-svn: 111250

PHI elimination should not break back edge. It can cause some significant code placement issues. rdar://8263994

good:
LBB0_2:
mov r2, r0
. . .
mov r1, r2
bne LBB0_2

bad:
LBB0_2:

PHI elimination should not break back edge. It can cause some significant code placement issues. rdar://8263994

good:
LBB0_2:
mov r2, r0
. . .
mov r1, r2
bne LBB0_2

bad:
LBB0_2:
mov r2, r0
. . .
@ BB#3:
mov r1, r2
b LBB0_2

llvm-svn: 111221

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Add a getFirstNonPHI utility function.

llvm-svn: 107778

Reapply r107655 with fixes; insert the pseudo instruction into
the block before calling the expansion hook. And don't
put EFLAGS in a mbb's live-in list twice.

llvm-svn: 107691

Revert r107655.

llvm-svn: 107668

Fix a bunch of custom-inserter functions to handle the case where
the pseudo instruction is not at the end of the block.

llvm-svn: 107655

Move PHIElimination's SplitCriticalEdge for MachineBasicBlocks out
into a utility routine, teach it how to update MachineLoopInfo, and
make use of it in MachineLICM to split critical edges on demand.

Move PHIElimination's SplitCriticalEdge for MachineBasicBlocks out
into a utility routine, teach it how to update MachineLoopInfo, and
make use of it in MachineLICM to split critical edges on demand.

llvm-svn: 106555

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Add a DebugLoc parameter to TargetInstrInfo::InsertBranch(). This
addresses a longstanding deficiency noted in many FIXMEs scattered
across all the targets.

This effectively moves the problem up on

Add a DebugLoc parameter to TargetInstrInfo::InsertBranch(). This
addresses a longstanding deficiency noted in many FIXMEs scattered
across all the targets.

This effectively moves the problem up one level, replacing eleven
FIXMEs in the targets with eight FIXMEs in CodeGen, plus one path
through FastISel where we actually supply a DebugLoc, fixing Radar
7421831.

llvm-svn: 106243

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Eliminate MachineBasicBlock::const_livein_iterator and make
MachineBasicBlock::livein_iterator a const_iterator, because
clients shouldn't ever be using the iterator interface to
mutate the livein se

Eliminate MachineBasicBlock::const_livein_iterator and make
MachineBasicBlock::livein_iterator a const_iterator, because
clients shouldn't ever be using the iterator interface to
mutate the livein set.

llvm-svn: 101147

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Reapply r100056. It doesn't look like it's the one that's causing a failure.

llvm-svn: 100065

Revert r100056. It was causing a failure on MSVC.

llvm-svn: 100062

Rewrite CorrectExtraCFGEdges() to make it more understandable.

* Set the "DestA" and "DestB" according to how they're understood by the
method. I.e., if one or both of them should point to the "fa

Rewrite CorrectExtraCFGEdges() to make it more understandable.

* Set the "DestA" and "DestB" according to how they're understood by the
method. I.e., if one or both of them should point to the "fall through" block,
then point to the fall through block.

* Improve the loop that removes superfluous edges to be more understandable.

llvm-svn: 100056

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Rip out the 'is temporary' nonsense from the MCContext interface to
create symbols. It is extremely error prone and a source of a lot
of the remaining integrated assembler bugs on x86-64.

This fixe

Rip out the 'is temporary' nonsense from the MCContext interface to
create symbols. It is extremely error prone and a source of a lot
of the remaining integrated assembler bugs on x86-64.

This fixes rdar://7807601.

llvm-svn: 99902

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eliminate the now-unneeded context argument of MBB::getSymbol()

llvm-svn: 98451

set the temporary bit on MCSymbols correctly.

llvm-svn: 98124

move isOnlyReachableByFallthrough out of MachineBasicBlock into AsmPrinter,
and add a sparc implementation that knows about delay slots. Patch by
Nathan Keynes!

llvm-svn: 96492