This reapplies the fix for PR13303 now with more justification. Based on my
execution of the GDB 7.5 test suite this results in:

expected passes: 16101 -> 20890 (+30%)
unexpected failures: 4826 -> 637 (-77%)

There are 23 checks that used to pass and now fail. They are all in
gdb.reverse. Investigating a few looks like they were accidentally passing
due to extra breakpoints being set by this bug. They're generally due to the
difference in end location between gcc and clang, the test suite is trying to
set breakpoints on the closing '}' that clang doesn't associate with any
instructions.

llvm-svn: 169304

textually as NativeClient. Also added a link to the native client project for
readers unfamiliar with it.

A Clang patch will follow shortly.

llvm-svn: 169291

llvm-svn: 169288

instructions.

llvm-svn: 169287

llvm-svn: 169284

on 64-bit PowerPC ELF.

The patch includes code to handle external assembly and MC output with the
integrated assembler.  It intentionally does not support the "old" JIT.

For the initial-exec TLS model, the ABI requires the following to calculate
the address of external thread-local variable x:

 Code sequence            Relocation                  Symbol
  ld 9,x@got@tprel(2)      R_PPC64_GOT_TPREL16_DS      x
  add 9,9,x@tls            R_PPC64_TLS                 x

The register 9 is arbitrary here.  The linker will replace x@got@tprel
with the offset relative to the thread pointer to the generated GOT
entry for symbol x.  It will replace x@tls with the thread-pointer
register (13).

The two test cases verify correct assembly output and relocation output
as just described.

PowerPC-specific selection node variants are added for the two
instructions above:  LD_GOT_TPREL and ADD_TLS.  These are inserted
when an initial-exec global variable is encountered by
PPCTargetLowering::LowerGlobalTLSAddress(), and later lowered to
machine instructions LDgotTPREL and ADD8TLS.  LDgotTPREL is a pseudo
that uses the same LDrs support added for medium code model's LDtocL,
with a different relocation type.

The rest of the processing is straightforward.

llvm-svn: 169281

missed in the first pass because the script didn't yet handle include
guards.

Note that the script is now able to handle all of these headers without
manual edits. =]

llvm-svn: 169224

llvm-svn: 169223

This comment has the dual effect of blocking reorderings with the
sort_include script.

llvm-svn: 169221

The count field is necessary because there isn't a difference between the 'lo'
and 'hi' attributes for a one-element array and a zero-element array. When the
count is '0', we know that this is a zero-element array. When it's >=1, then
it's a normal constant sized array. When it's -1, then the array is unbounded.

llvm-svn: 169218

Add the last part that is needed for vectorization of if-converted code.
Added the code that actually performs the if-conversion during vectorization.

We can now vectorize this code:

for (int i=0; i<n; ++i) {
  unsigned k = 0;

  if (a[i] > b[i])   <------ IF inside the loop.
    k = k * 5 + 3;

  a[i] = k;          <---- K is a phi node that becomes vector-select.
}

llvm-svn: 169217

[asan] add experimental -asan-realign-stack option (true by default, which does not change the current behavior) 

llvm-svn: 169216

llvm-svn: 169214

llvm-svn: 169213

llvm-svn: 169212

The type of shirt-right (logical or arithemetic) should remain unchanged 
when transforming  "X << C1 >> C2" into "X << (C1-C2)"

llvm-svn: 169209

ASan: add initial support for handling llvm.lifetime intrinsics in ASan - emit calls into runtime library that poison memory for local variables when their lifetime is over and unpoison memory when their lifetime begins.

llvm-svn: 169200

llvm-svn: 169198

the alignment is clamped to TargetFrameLowering.getStackAlignment if the target
does not support stack realignment or the option "realign-stack" is off.

This will cause miscompile if the address is treated as aligned and add is
replaced with or in DAGCombine.

Added a bool StackRealignable to TargetFrameLowering to check whether stack
realignment is implemented for the target. Also added a bool RealignOption
to MachineFrameInfo to check whether the option "realign-stack" is on.

rdar://12713765

llvm-svn: 169197

llvm-svn: 169196

llvm-svn: 169195

llvm-svn: 169194

These functions have been replaced by TRI::getRegAllocationHints() which
provides the same capabilities.

llvm-svn: 169192

Now that there can be multiple hint registers from targets, it doesn't
make sense to have a function that returns 'the' preferred register.

llvm-svn: 169190

Targets can provide multiple hints now, so getRegAllocPref() doesn't
make sense any longer because it only returns one preferred register.
Replace it with getSimpleHint() in the remaining heuristics. This
function only

llvm-svn: 169188

No functional change for this commit. The follow-up patch will add more stuff to
these functions.

rdar://12713765

llvm-svn: 169186

llvm-svn: 169183

 This change tries to simmplify E1 = " X >> C1 << C2" into :
  - E2 = "X << (C2 - C1)" if C2 > C1, or
  - E2 = "X >> (C1 - C2)" if C1 > C2, or
  - E2 = X if C1 == C2.

 Reviewed by Nadav. Thanks!

llvm-svn: 169182

Virtual registers with a known preferred register are prioritized by
RAGreedy. This function makes the condition explicit without depending
on getRegAllocPref().

llvm-svn: 169179

This small change adds support for that. It will make all MCJIT tests pass
in make-check on BigEndian platforms.

Patch by Petar Jovanovic.

llvm-svn: 169178

This change adds endian-awareness to MipsJITInfo and emitWordLE in
MipsCodeEmitter has become emitWord now to support both endianness.

Patch by Petar Jovanovic.

llvm-svn: 169177

llvm-svn: 169176

llvm-svn: 169175

code. Removing it.

Patch by Petar Jovanovic.

llvm-svn: 169174

This simplifies the hinting code quite a bit while making the targets
easier to write at the same time.

llvm-svn: 169173

llvm-svn: 169172

llvm-svn: 169171

This provides the same functionality as getRawAllocationOrder() for the
even/odd hints, but without the many constant register arrays.

llvm-svn: 169169

using multiclass.

llvm-svn: 169168

llvm-svn: 169167