Fix X86's isTruncateFree to not claim that truncate to i1 is free. This fixes Bill's testcase that failed for r48491.

llvm-svn: 48542

struct types.  Patch by David Chisnall, with some tweaks.

llvm-svn: 48531

llvm-svn: 48528

llvm-svn: 48526

Based on Erick Tryzelaar's patch.

llvm-svn: 48523

1. If part of a register is re-defined, an implicit kill and an implicit def are added to denote read / mod / write. However, this should only be necessary if the register is actually read later. This is a performance issue.
2. If a sub-register is being defined, and it doesn't have a previous use, do not add a implicit kill to the last use of a super-register:
   = EAX, AX<imp-use,kill>
...
AX =
In this case, EAX is live but AX is killed, this is wrong and will cause the coalescer to do bad things.

llvm-svn: 48521

llvm-svn: 48520

attribute instead of ".protected".

llvm-svn: 48516

Fix a x86-64 isel lowering bug that's been around forever. A x86-64 varargs function implicitly reads X86::AL, don't clobber it!

llvm-svn: 48515

llvm-svn: 48510

llvm-svn: 48509

llvm-svn: 48493

variables and methods themselves only use unsigned.)

llvm-svn: 48492

Target independent DAG transform to use truncate for field extraction + sign extend on targets where this is profitable. Passes nightly on x86-64.

llvm-svn: 48491

Rewrite code that propagate isDead information after a dead copy is coalesced. This remove some ugly spaghetti code and fixed a number of subtle bugs.

llvm-svn: 48490

Do not run analysis pass again if analysis info is still available.
This fixes PR1441.

llvm-svn: 48476

llvm-svn: 48474

in ppc64 mode.

llvm-svn: 48459

lowering over to SparcCallingConv.td.  We can't make the switch
yet because we can't say to pass f64 registers in 2 x i32 registers
with the td file yet.

llvm-svn: 48449

llvm-svn: 48448

llvm-svn: 48447

the coalescer.  This doesn't really work, but gets us farther than
before.

llvm-svn: 48446

llvm-svn: 48445

other targets.  Use autogenerated calling conv to lower result of
calls.

llvm-svn: 48444

return lowering first.  This fixes a bug where the top and bottom
of i64 values were returned in the wrong registers before.

llvm-svn: 48443

best practices.

llvm-svn: 48442

each lowering, which is 'best practice'.

llvm-svn: 48441

behavior where a callee thinks a param will be
present in memory, even though the ABI doc says
it doesn't have to be.  Handle complex long long
and complex double (4 and 8 return regs).

llvm-svn: 48439

llvm-svn: 48438

llvm-svn: 48430

llvm-svn: 48422

llvm-svn: 48421

Patch originally by Erick Tryzelaar, but has been modified somewhat.

llvm-svn: 48419

llvm-svn: 48413

Make insert_subreg a two-address instruction, vastly simplifying LowerSubregs pass. Add a new TII, subreg_to_reg, which is like insert_subreg except that it takes an immediate implicit value to insert into rather than a register.

llvm-svn: 48412

llvm-svn: 48381

Replace all target specific implicit def instructions with a target independent one: TargetInstrInfo::IMPLICIT_DEF.

llvm-svn: 48380

Patch by Erick Tryzelaar.

llvm-svn: 48379

table for nounwind calls.

llvm-svn: 48373

Fix PR2138. Apparently any modification to a std::multimap (including remove entries for a different key) can invalidate multimap iterators.

llvm-svn: 48371