Patch by arrowdodger!

llvm-svn: 123376

the comment I added): an extern weak global may have a null address.

llvm-svn: 123373

is "X != 0 -> X" when X is a boolean.  This occurs a lot because of the way
llvm-gcc converts gcc's conditional expressions.  Add this, and a few other
similar transforms for completeness.

llvm-svn: 123372

in the right direction. It eliminated some hacks and will unblock codegen
work. But it's far from being done. It doesn't reject illegal expressions,
e.g. (FOO - :lower16:BAR). It also doesn't work in Thumb2 mode at all.

llvm-svn: 123369

16 bytes for PR8969. Update all testcases accordingly.

llvm-svn: 123367

llvm-svn: 123364

llvm-svn: 123358

.code 32 if the TargetMachine's isThumb() boolean does not match.  The correct
fix is to switch ARM subtargets at that point and is tracked by rdar://8856789
which is bigger task.

llvm-svn: 123353

llvm-svn: 123352

llvm-svn: 123351

llvm-svn: 123350

llvm-svn: 123347

further on the associated testcase before aborting.

llvm-svn: 123346

llvm-svn: 123345

llvm-svn: 123342

llvm-svn: 123341

that way, unfortunately. If you want to change them to work additively instead
of a one-variant-kind-per-symbolref, that's great and I completely agree it's
worth doing, but it really should be a separate patch. Until then, this isn't
correct."

So I am reverting this bit until a more opportune time.

llvm-svn: 123340

llvm-svn: 123339

llvm-svn: 123338

Make sure we don't crash in that case, but simply turn them into %noreg instead.

llvm-svn: 123335

It was leaving dangling pointers in the slot index maps.

llvm-svn: 123334

llvm-svn: 123333

The slot indexes must be monotonically increasing through the function.

llvm-svn: 123324

llvm-svn: 123323

llvm-svn: 123322

enum values we give to them. <rdar://problem/8823730>

llvm-svn: 123321

llvm-svn: 123318

of the switch block to appease GCC.

llvm-svn: 123317

llvm-svn: 123315

llvm-svn: 123310

ensure %o7 is not assigned as the destination of getpcx instruction.

llvm-svn: 123304

llvm-svn: 123302

are correctly marked as used instead of passing all possible argument registers
as used.  

llvm-svn: 123301

of the bootstrap miscompare issue.

llvm-svn: 123299

the source of the bootstrap problem.

llvm-svn: 123298

llvm-svn: 123297

  R_ARM_MOVT_PREL and R_ARM_MOVW_PREL_NC.
2. Fix minor bug in ARMAsmPrinter - treat bitfield flag as a bitfield, not an enum.
3. Add support for 3 new elf section types (no-ops)

llvm-svn: 123294

.s Test added.

llvm-svn: 123292

llvm-svn: 123290

llvm-svn: 123288