- This more or less amounts to a revert of r65379. I'm curious to know what
   happened that caused this variable to become unused.

llvm-svn: 74579

llvm-svn: 74577

llvm-svn: 74574

llvm-svn: 74573

llvm-svn: 74572

immediates.

llvm-svn: 74568

llvm-svn: 74566

allowed to be undefined when the expression is seen, we cannot enforce the
same-section requirement until the entire assembly file has been seen.

llvm-svn: 74565

have the alignment be calculated up front, and have the back-ends obey whatever
alignment is decided upon.

This allows for future work that would allow for precise no-op placement and the
like.

llvm-svn: 74564

llvm-svn: 74555

llvm-svn: 74553

llvm-svn: 74551

in APIntTest.cpp.

llvm-svn: 74550

llvm-svn: 74549

Add 256-bit memory operand support.

llvm-svn: 74548

llvm-svn: 74543

llvm-svn: 74542

llvm-svn: 74538

llvm-svn: 74537

Avoid unnecessary duplication of operand 0 of X86::FpSET_ST0_80. This duplication would
cause one register to remain on the stack at the function return.

llvm-svn: 74534

llvm-svn: 74531

 - Apologies in advance for the noise.

llvm-svn: 74530

llvm-svn: 74529

llvm-svn: 74527

See http://msdn.microsoft.com/en-us/library/ms686818(VS.85).aspx

Patch by Olaf Krzikalla!

llvm-svn: 74526

This was caused by me confounding FP0 and ST(0).

llvm-svn: 74523

Temporarily restore the scavenger implicit_def checking code. MachineOperand isUndef mark is not being put on implicit_def of physical registers (created for parameter passing, etc.).

llvm-svn: 74519

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