This is still a hack until we can teach tblgen to generate the
optional CPSR operand rather than an implicit CPSR def. But the
strangeness is now limited to the selection DAG. ADD/SUB MI's no
longer have implicit CPSR defs, nor do we allow flag setting variants
of these opcodes in machine code. There are several corner cases to
consider, and getting one wrong would previously lead to nasty
miscompilation. It's not the first time I've debugged one, so this
time I added enough verification to ensure it won't happen again.

llvm-svn: 140228

There is only one legitimate use remaining, in addIntervalsForSpills().
All other calls to hasPHIKill() are only used to update PHIKill flags.

The addIntervalsForSpills() function is part of the old spilling
framework, only used by linearscan.

llvm-svn: 139783

The ARM target depends on CPSR liveness being tracked after register
allocation.

llvm-svn: 136548

This includes registers like EFLAGS and ST0-ST7. We don't check for
liveness issues in the verifier and scavenger because registers will
never be allocated from these classes.

While in SSA form, we do care about the liveness of unallocatable
unreserved registers. Liveness of EFLAGS and ST0 neds to be correct for
MachineDCE and MachineSinking.

llvm-svn: 136541

llvm-svn: 136535

sink them into MC layer.
- Added MCInstrInfo, which captures the tablegen generated static data. Chang
TargetInstrInfo so it's based off MCInstrInfo.

llvm-svn: 134021

llvm-svn: 133944

No functional change.

llvm-svn: 132455

on CodeGen/X86/2007-05-07-InvokeSRet.ll. There is probably a bug here that was
fixed by r128961, but since there is no test or reference to a source file I have
to revert it.

llvm-svn: 131618

landing pad as its successor.

SjLj exception handling jumps to the correct landing pad via a switch statement
that's generated right before code-gen. Loosen the constraint in the machine
instruction verifier to allow for this. Note, this isn't the most rigorous check
since we cannot determine where that switch statement came from. But it's
marginally better than turning this check off when SjLj exceptions are used.
<rdar://problem/9187612>

llvm-svn: 130881

Treat the landing pad as a normal successor when that happens.

llvm-svn: 128961

llvm-svn: 128643

This way, shrinkToUses() will ignore the instruction that is about to be
deleted, and we avoid leaving invalid live ranges that SplitKit doesn't like.

Fix a misunderstanding in MachineVerifier about <def,undef> operands. The
<undef> flag is valid on def operands where it has the same meaning as <undef>
on a use operand. It only applies to sub-register defines which also read the
full register.

llvm-svn: 128642

Allow a live range to end with a kill flag, but don't allow a kill flag that
doesn't end the live range.

This makes the machine code verifier more useful during register allocation when
kill flag computation is deferred.

llvm-svn: 124838

The slot indexes must be monotonically increasing through the function.

llvm-svn: 123324

llvm-svn: 123322

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

virtual registers.

llvm-svn: 123100

in the most obvious way.

llvm-svn: 122610

valno verification. The "Different value live out of predecessor" check is
incorrect in the case of phi-def valnos, so just skip that check for phi-def
valnos and instead check that all of the valnos for predecessors have phi-kill.
Fixes PR8863.

llvm-svn: 122581

out-edges. Fixes PR8824.

llvm-svn: 122228

begin at DEF slots. Fixes the second half of PR8813.

llvm-svn: 122225

llvm-svn: 122224

the register; it may be a dead def instead. Fixes PR8820.

llvm-svn: 122218

PR8822.

llvm-svn: 122207

half of PR8813.

llvm-svn: 122205

llvm-svn: 122199

createMachineVerifierPass and MachineFunction::verify.

The banner is printed before the machine code dump, just like the printer pass.

llvm-svn: 122113

the operand uses the same register as a tied operand:

  %r1 = add %r1, %r1

If add were a three-address instruction, kill flags would be required on at
least one of the uses. Since it is a two-address instruction, the tied use
operand must not have a kill flag.

This change makes the kill flag on the untied use operand optional.

llvm-svn: 122082

operands in a variadic instruction.

llvm-svn: 119446

(and likely) wrong about anyhow.

llvm-svn: 119320

It is legal for an instruction to have two operands using the same register,
only one a kill. This is interpreted as a kill.

llvm-svn: 117981

At least X86FloatingPoint requires correct kill flags after register allocation,
and targets using register scavenging benefit. Conservative kill flags are not
enough.

llvm-svn: 117960

When an instruction refers to a spill slot with a LiveStacks entry, check that
the spill slot is live at the instruction.

llvm-svn: 117944

llvm-svn: 117762

multiplicity.

llvm-svn: 117630

llvm-svn: 117602

Only virtuals should be requires to be connected.

llvm-svn: 117422

components, each should get its own virtual register.

llvm-svn: 117407

SlotIndexes when available.

llvm-svn: 117392