Add a bit IsUndef to MachineOperand. This indicates the def / use register operand is defined by an implicit_def. That means it can def / use any register and passes (e.g. register scavenger) can feel free to ignore them.

The register allocator, when it allocates a register to a virtual register defined by an implicit_def, can allocate any physical register without worrying about overlapping live ranges. It should mark all of operands of the said virtual register so later passes will do the right thing.

This is not the best solution. But it should be a lot less fragile to having the scavenger try to track what is defined by implicit_def.

llvm-svn: 74518

llvm-svn: 74515

llvm-svn: 74514

llvm-svn: 74512

llvm-svn: 74511

llvm-svn: 74510

llvm-svn: 74509

llvm-svn: 74508

llvm-svn: 74507

llvm-svn: 74500

llvm-svn: 74499

llvm-svn: 74498

legally negate an MCValue.

llvm-svn: 74497

llvm-svn: 74496

llvm-svn: 74495

This will allow it to be used in unittests that use gtest's
EXPECT_EQ.

llvm-svn: 74494

llvm-svn: 74492

llvm-svn: 74491

llvm-svn: 74490

 - Don't print "Parsing" in front of every message.

 - Take additional "type" argument which is prepended to the message (with ": ")
   if given.

 - Update clients to print errors (warnings) as:
<filename>:<line number>: error(warning): ...

llvm-svn: 74489

Add LLVMContext, which will eventually be used as a container for privatizing a lot of (currently) global state, including the
constant and type uniquing tables.  For now, just make it a wrapper around the existing APIs.

llvm-svn: 74488

llvm-svn: 74487

llvm-svn: 74485

llvm-svn: 74484

llvm-svn: 74483

llvm-svn: 74482

llvm-svn: 74478

llvm-svn: 74477

 - For example, we diagnose errors on:
--
a:
a = 10
--

 - For now we reject code like:
--
.long a
a = 10
--
   which "as" accepts (on Darwin).

llvm-svn: 74476

 - To support using SMLoc as a sentinel.

llvm-svn: 74474

llvm-svn: 74473

Remove commented code.

llvm-svn: 74471

Add a 256-bit register class and YMM registers.

llvm-svn: 74469

llvm-svn: 74468

llvm-svn: 74464

llvm-svn: 74463

llvm-svn: 74462

Constant. This lets ConstantInts be handled as SCEVConstant instead
of SCEVUnknown, as getUnknown no longer has special-case code for
ConstantInt and friends. This usually doesn't affect the final
output, since the constants end up getting folded later, but it
does make intermediate expressions more obvious in many cases.

llvm-svn: 74459

llvm-svn: 74457

module support to build).

llvm-svn: 74456