A temporary flag -arm-tail-calls defaults to off,
so there is no functional change by default.
Intrepid users may try this; simple cases work
but there are bugs.

llvm-svn: 105413

operand of a throw expression.  Fixes PR7281.

llvm-svn: 105408

needs to demand the high bits because it's asserting that they're zero.

llvm-svn: 105406

actually care about it. Fixes PR7291.

llvm-svn: 105404

llvm-svn: 105402

This is required in order to test:

The ASTImporter should set base classes after formally entering the definition.

llvm-svn: 105401

llvm-svn: 105399

llvm-svn: 105397

llvm-svn: 105396

llvm-svn: 105395

llvm-svn: 105394

llvm-svn: 105393

Return a proper null CXSourceLocation from clang_getLocation() when the SourceLocation is invalid.  Fixes <rdar://problem/8056640>.

llvm-svn: 105392

llvm-svn: 105391

llvm-svn: 105390

needed. The result is that now we are able to drop unnecessary symbol from
shared libraries.

llvm-svn: 105389

registers it defines then interfere with an existing preg live range.

For instance, if we had something like these machine instructions:

BB#0
  ... = imul ... EFLAGS<imp-def,dead>
  test ..., EFLAGS<imp-def>
  jcc BB#2 EFLAGS<imp-use>

BB#1
  ... ; fallthrough to BB#2

BB#2
  ... ; No code that defines EFLAGS
  jcc ... EFLAGS<imp-use>

Machine sink will come along, see that imul implicitly defines EFLAGS, but
because it's "dead", it assumes that it can move imul into BB#2. But when it
does, imul's "dead" imp-def of EFLAGS is raised from the dead (a zombie) and
messes up the condition code for the jump (and pretty much anything else which
relies upon it being correct).

The solution is to know which pregs are live going into a basic block. However,
that information isn't calculated at this point. Nor does the LiveVariables pass
take into account non-allocatable physical registers. In lieu of this, we do a
*very* conservative pass through the basic block to determine if a preg is live
coming out of it.

llvm-svn: 105387

implementation. Force the internal one to unbreak clang selfhost on linux.

llvm-svn: 105386

llvm-svn: 105385

llvm-svn: 105384

llvm-svn: 105383

llvm-svn: 105382

llvm-svn: 105381

arm_neon.h now makes it through clang and generates appropriate code for those functions which can use
generic vector operators rather than __builtin_neon_*

llvm-svn: 105380

llvm-svn: 105379

expansion is the same as that used by LegalizeDAG.

The resulting code sucks in terms of performance/codesize on x86-32 for a
64-bit operation; I haven't looked into whether different expansions might be
better in general.

llvm-svn: 105378

llvm-svn: 105377

llvm-svn: 105376

llvm-svn: 105375

llvm-svn: 105374

This affects both llvm-gcc and clang.

llvm-svn: 105372

spills and reloads.

This means that a partial define of a register causes a reload so the other
parts of the register are preserved.

The reload can be prevented by adding an <imp-def> operand for the full
register. This is already done by the coalescer and live interval analysis where
relevant.

llvm-svn: 105369

register updates.

These operands tell the spiller that the other parts of the partially defined
register are don't-care, and a reload is not necessary.

llvm-svn: 105361

Speedup bitcode writer. Do not walk all values for all functions to emit function local metadata. In one testcase, probably worst case scenario, the 70x speed up is seen.

llvm-svn: 105360

llvm-svn: 105359

instruction defines subregisters.

Any existing subreg indices on the original instruction are preserved or
composed with the new subreg index.

Also substitute multiple operands mentioning the original register by using the
new MachineInstr::substituteRegister() function. This is necessary because there
will soon be <imp-def> operands added to non read-modify-write partial
definitions. This instruction:

  %reg1234:foo = FLAP %reg1234<imp-def>

will reMaterialize(%reg3333, bar) like this:

  %reg3333:bar-foo = FLAP %reg333:bar<imp-def>

Finally, replace the TargetRegisterInfo pointer argument with a reference to
indicate that it cannot be NULL.

llvm-svn: 105358

llvm-svn: 105355

llvm-svn: 105354

llvm-svn: 105353

OSX users: make sure that CrashReporter is disabled when running unit tests.
Death tests are enabled now so you'll get a ton of message boxes.

llvm-svn: 105352