- 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

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

Add 256-bit memory operand support.

llvm-svn: 74548

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

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

llvm-svn: 74523

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: 74509

llvm-svn: 74508

Add a 256-bit register class and YMM registers.

llvm-svn: 74469

Not sure I understand how the temp register gets used,
but this fixes a bug and introduces no regressions.

llvm-svn: 74446

fence-atomic-fence down to just the atomic op.  This is possible thanks to
X86's relatively strong memory model, which guarantees that locked instructions
(which are used to implement atomics) are implicit fences.

llvm-svn: 74435

Add processor descriptions for Istanbul and Shanghai.

llvm-svn: 74429

Fix a subtarget feature bug.

llvm-svn: 74428

Add more vector ValueTypes for AVX and other extended vector instruction
sets.

llvm-svn: 74427

target-specific operand printing functionality.  Yay.

llvm-svn: 74379

llvm-svn: 74378

llvm-svn: 74377

llvm-svn: 74375

a base register.  We just ignore it for now.

llvm-svn: 74374

globals.  This implements remat-constant.ll even without aggressive-remat.

llvm-svn: 74373

implementation primarily differs from the former in that the asmprinter
doesn't make a zillion decisions about whether or not something will be
RIP relative or not.  Instead, those decisions are made by isel lowering
and propagated through to the asm printer.  To achieve this, we:

1. Represent RIP relative addresses by setting the base of the X86 addr
   mode to X86::RIP.
2. When ISel Lowering decides that it is safe to use RIP, it lowers to
   X86ISD::WrapperRIP.  When it is unsafe to use RIP, it lowers to
   X86ISD::Wrapper as before.
3. This removes isRIPRel from X86ISelAddressMode, representing it with
   a basereg of RIP instead.
4. The addressing mode matching logic in isel is greatly simplified.
5. The asmprinter is greatly simplified, notably the "NotRIPRel" predicate
   passed through various printoperand routines is gone now.
6. The various symbol printing routines in asmprinter now no longer infer
   when to emit (%rip), they just print the symbol.

I think this is a big improvement over the previous situation.  It does have
two small caveats though: 1. I implemented a horrible "no-rip" modifier for
the inline asm "P" constraint modifier.  This is a short term hack, there is
a much better, but more involved, solution.  2. I had to xfail an 
-aggressive-remat testcase because it isn't handling the use of RIP in the
constant-pool reading instruction.  This specific test is easy to fix without
-aggressive-remat, which I intend to do next.

llvm-svn: 74372

llvm-svn: 74366

Add feature flags for AVX and FMA and fix some SSE4A feature flag
initialization problems.

llvm-svn: 74350

Add x86 support for 'n' inline asm modifier. This will be handled target independently as part of MC work.

llvm-svn: 74336

llvm-svn: 74334

llvm-svn: 74328

llvm-svn: 74327

llvm-svn: 74326

llvm-svn: 74316

llvm-svn: 74313

llvm-svn: 74310

llvm-svn: 74275

llvm-svn: 74272

llvm-svn: 74255

llvm-svn: 74246

llvm-svn: 74186

from the asmprinter.

llvm-svn: 74184

llvm-svn: 74183

llvm-svn: 74161

llvm-svn: 74154