9 years agoAdd move constructors for OwningPtr and OwningArrayPtr.
Jordan Rose [Thu, 18 Oct 2012 22:22:58 +0000 (22:22 +0000)]
Add move constructors for OwningPtr and OwningArrayPtr.

While LLVM itself is still C++03, there's no reason why tools built on
top of it can't use C++11 features.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166242 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoAdd a T&& constructor to llvm::Optional.
Jordan Rose [Thu, 18 Oct 2012 22:22:55 +0000 (22:22 +0000)]
Add a T&& constructor to llvm::Optional.

This allows llvm::Optional to be used with movable-but-not-copyable types.
While LLVM itself is still C++03, there's no reason why tools built on
top of it can't use C++11 features.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166241 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoMark bugpoint tests with XFAIL when building with LTO. <rdar://problem/12473675>
Bob Wilson [Thu, 18 Oct 2012 22:03:31 +0000 (22:03 +0000)]
Mark bugpoint tests with XFAIL when building with LTO. <rdar://problem/12473675>

The LTO Internalize pass is hiding symbols needed by the bugpoint-passes
plug-in.  We need to add a flag to control whether Internalize should be run.
This is a temporary workaround to make these tests pass in the meantime.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166239 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoFix a bug where a 32-bit address with the high bit does not get symbolicated
Kevin Enderby [Thu, 18 Oct 2012 21:49:18 +0000 (21:49 +0000)]
Fix a bug where a 32-bit address with the high bit does not get symbolicated
because the value is incorrectly being signed extended when passed to

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166234 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agofix a naming typo
Nadav Rotem [Thu, 18 Oct 2012 21:45:31 +0000 (21:45 +0000)]
fix a naming typo

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166232 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agotest: Add a lit config variable to check if LTO is enabled.
Daniel Dunbar [Thu, 18 Oct 2012 20:43:11 +0000 (20:43 +0000)]
test: Add a lit config variable to check if LTO is enabled.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166225 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agolit: Allow XFAIL: lines to also refer to "features".
Daniel Dunbar [Thu, 18 Oct 2012 20:43:04 +0000 (20:43 +0000)]
lit: Allow XFAIL: lines to also refer to "features".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166224 91177308-0d34-0410-b5e6-96231b3b80d8

9 years ago[ms-inline asm] Add a size argument to the LookupInlineAsmIdentifier() callback,
Chad Rosier [Thu, 18 Oct 2012 20:27:15 +0000 (20:27 +0000)]
[ms-inline asm] Add a size argument to the LookupInlineAsmIdentifier() callback,
which will be used by the asm matcher in the near future.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166222 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoUse an export list when building JIT unittests. <rdar://problem/12473675>
Bob Wilson [Thu, 18 Oct 2012 20:25:36 +0000 (20:25 +0000)]
Use an export list when building JIT unittests. <rdar://problem/12473675>

When building with LTO, the internalize pass is hiding some global symbols
that are necessary for the JIT unittests. It seems like that may be a bug in
LTO to do that by default, but until that gets fixed, this change makes sure
that we export the necessary symbols for the tests to pass.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166220 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoUse pre-python 2.5 syntax in lit.cfg.
Sebastian Pop [Thu, 18 Oct 2012 19:58:28 +0000 (19:58 +0000)]
Use pre-python 2.5 syntax in lit.cfg.

Author:    Quentin Neill <qneill@codeaurora.org>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166217 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoClear unknown mem ops when merging stack slots (pr14090)
Sebastian Pop [Thu, 18 Oct 2012 19:53:48 +0000 (19:53 +0000)]
Clear unknown mem ops when merging stack slots (pr14090)

When merging stack slots, if StackColoring::remapInstructions gets a
value back from GetUnderlyingObject that it does not know about or is
not itself a stack slot, clear the memory operand in case it aliases
the merged slot. This prevents the introduction of incorrect aliasing

Author:    Matthew Curtis <mcurtis@codeaurora.org>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166216 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoChange MachineFrameInfo::StackObject::Alloca from Value* to AllocaInst*
Sebastian Pop [Thu, 18 Oct 2012 19:53:45 +0000 (19:53 +0000)]
Change MachineFrameInfo::StackObject::Alloca from Value* to AllocaInst*

This more accurately reflects what is actually being stored in the

No functionality change intended.

Author:    Matthew Curtis <mcurtis@codeaurora.org>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166215 91177308-0d34-0410-b5e6-96231b3b80d8

9 years ago[ms-inline asm] Have the LookupInlineAsmIdentifier() callback function return a
Chad Rosier [Thu, 18 Oct 2012 19:39:30 +0000 (19:39 +0000)]
[ms-inline asm] Have the LookupInlineAsmIdentifier() callback function return a
*NamedDecl.  In turn, build the expressions after we're finished parsing the
asm.  This avoids a crasher if the lookup fails.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166212 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoRevert "We need this symbol after an LTO build."
Bob Wilson [Thu, 18 Oct 2012 18:52:54 +0000 (18:52 +0000)]
Revert "We need this symbol after an LTO build."

This reverts commit 165776.  The plug-in uses this symbol; it does not
define it.  It needs to be exported from bugpoint itself, not from the plug-in.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166207 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoAvoid reconstructing the pointer set when searching for duplicated read/write pointers.
Nadav Rotem [Thu, 18 Oct 2012 18:34:50 +0000 (18:34 +0000)]
Avoid reconstructing the pointer set when searching for duplicated read/write pointers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166205 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoUpdate the LangRef documentation for the per pointer address space support.
Micah Villmow [Thu, 18 Oct 2012 18:18:17 +0000 (18:18 +0000)]
Update the LangRef documentation for the per pointer address space support.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166201 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoCosmetic change -- move two simplifiers to the right commented statement group.
Meador Inge [Thu, 18 Oct 2012 18:12:43 +0000 (18:12 +0000)]
Cosmetic change -- move two simplifiers to the right commented statement group.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166199 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoinstcombine: Migrate strcpy optimizations
Meador Inge [Thu, 18 Oct 2012 18:12:40 +0000 (18:12 +0000)]
instcombine: Migrate strcpy optimizations

This patch migrates the strcpy optimizations from the simplify-libcalls pass
into the instcombine library call simplifier.  Note also that StrCpyChkOpt
has been updated with a few simplifications that were being done in the
simplify-libcalls version of StrCpyOpt, but not in the migrated implementation
of StrCpyOpt.  There is no reason to overload StrCpyOpt with fortified and
regular simplifications in the new model since there is already a dedicated
simplifier for __strcpy_chk.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166198 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agotest commit: verifying access from new address
Eli Bendersky [Thu, 18 Oct 2012 18:12:05 +0000 (18:12 +0000)]
test commit: verifying access from new address

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166197 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoIn SimplifySelectOps we pulled two loads through a select node despite the fact that...
Nadav Rotem [Thu, 18 Oct 2012 18:06:48 +0000 (18:06 +0000)]
In SimplifySelectOps we pulled two loads through a select node despite the fact that one was dependent on the other.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166196 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoWhen looking for a vector representation of a scalar, do a single lookup. Also, cache...
Nadav Rotem [Thu, 18 Oct 2012 17:31:49 +0000 (17:31 +0000)]
When looking for a vector representation of a scalar, do a single lookup. Also, cache the result of the broadcast instruction.
No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166191 91177308-0d34-0410-b5e6-96231b3b80d8

9 years ago[ms-inline asm] Move most of the AsmParsing logic in clang back into the MC
Chad Rosier [Thu, 18 Oct 2012 15:49:34 +0000 (15:49 +0000)]
[ms-inline asm] Move most of the AsmParsing logic in clang back into the MC
layer.  Add the ParseMSInlineAsm() function, which is the new interface to
clang.  Also expose the new MCAsmParserSemaCallback interface, which is used
by the back-end to do name lookup in Sema.  Finally, remove the now defunct
APIs introduced in r165946.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166183 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoThis patch fixes failures in the SingleSource/Regression/C/uint64_to_float
Ulrich Weigand [Thu, 18 Oct 2012 13:16:11 +0000 (13:16 +0000)]
This patch fixes failures in the SingleSource/Regression/C/uint64_to_float
test case on PowerPC caused by rounding errors when converting from a 64-bit
integer to a single-precision floating point. The reason for this are
double-rounding effects, since on PowerPC we have to convert to an
intermediate double-precision value first, which gets rounded to the
final single-precision result.

The patch fixes the problem by preparing the 64-bit integer so that the
first conversion step to double-precision will always be exact, and the
final rounding step will result in the correctly-rounded single-precision
result.  The generated code sequence is equivalent to what GCC would generate.

When -enable-unsafe-fp-math is in effect, that extra effort is omitted
and we accept possible rounding errors (just like GCC does as well).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166178 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoRefactor insert and extract of sub-integers into static helpers that
Chandler Carruth [Thu, 18 Oct 2012 09:56:08 +0000 (09:56 +0000)]
Refactor insert and extract of sub-integers into static helpers that
operate purely on values. Sink the alloca loading and storing logic into
the rewrite routines that are specific to alloca-integer-rewrite
driving. This is just a refactoring here, but the subsequent step will
be to reuse the insertion and extraction logic when rewriting integer
loads and stores that have been split and decomposed into narrower loads
and stores.

No functionality changed other than different names for instructions.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166176 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoThis FIXME was fixed some time ago. =]
Chandler Carruth [Thu, 18 Oct 2012 09:56:06 +0000 (09:56 +0000)]
This FIXME was fixed some time ago. =]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166175 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoIntroduce a BarrierNoop pass, a hack designed to allow *some* control
Chandler Carruth [Thu, 18 Oct 2012 08:05:46 +0000 (08:05 +0000)]
Introduce a BarrierNoop pass, a hack designed to allow *some* control
over the implicitly-formed-and-nesting CGSCC pass manager and function
pass managers, especially when using them on the opt commandline or
using extension points in the module builder. The '-barrier' opt flag
(or the pass itself) will create a no-op module pass in the pipeline,
resetting the pass manager stack, and allowing the creation of a new
pipeline of function passes or CGSCC passes to be created that is
independent from any previous pipelines.

For example, this can be used to test running two CGSCC passes in
independent CGSCC pass managers as opposed to in the same CGSCC pass
manager. It also allows us to introduce a further hack into the
PassManagerBuilder to separate the O0 pipeline extension passes from the
always-inliner's CGSCC pass manager, which they likely do not want to
participate in... At the very least none of the Sanitizer passes want
this behavior.

This fixes a bug with ASan at O0 currently, and I'll commit the ASan
test which covers this pass. I'm happy to add a test case that this pass
exists and works, but not sure how much time folks would like me to
spend adding test cases for the details of its behavior of partition
pass managers.... The whole thing is just vile, and mostly intended to
unblock ASan, so I'm hoping to rip this all out in a brave new pass
manager world.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166172 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoremove unused variable to fix a warning.
Nadav Rotem [Thu, 18 Oct 2012 06:09:21 +0000 (06:09 +0000)]
remove unused variable to fix a warning.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166170 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoAdd a small example which shows a vectorizable loop with a non-pow-of-two count
Nadav Rotem [Thu, 18 Oct 2012 05:46:16 +0000 (05:46 +0000)]
Add a small example which shows a vectorizable loop with a non-pow-of-two count

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166169 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoTemporarily revert the TargetTransform changes.
Bob Wilson [Thu, 18 Oct 2012 05:43:52 +0000 (05:43 +0000)]
Temporarily revert the TargetTransform changes.

The TargetTransform changes are breaking LTO bootstraps of clang.  I am
working with Nadav to figure out the problem, but I am reverting it for now
to get our buildbots working.

This reverts svn commits: 165665 165669 165670 165786 165787 165997
and I have also reverted clang svn 165741

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166168 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoRemove the use of dominators and AA.
Nadav Rotem [Thu, 18 Oct 2012 05:33:02 +0000 (05:33 +0000)]
Remove the use of dominators and AA.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166167 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoVectorizer: Add support for loops with an unknown count. For example:
Nadav Rotem [Thu, 18 Oct 2012 05:29:12 +0000 (05:29 +0000)]
Vectorizer: Add support for loops with an unknown count. For example:

     for (i=0; i<n; i++){
        a[i] = b[i+1] + c[i+3];

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166165 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoRevert r166157 because some tests fail...
Bill Wendling [Wed, 17 Oct 2012 23:56:05 +0000 (23:56 +0000)]
Revert r166157 because some tests fail...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166159 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoCheck that the operand of the GEP is not the GEP itself. This occurred during an...
Bill Wendling [Wed, 17 Oct 2012 23:54:19 +0000 (23:54 +0000)]
Check that the operand of the GEP is not the GEP itself. This occurred during an LTO build of LLVM.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166157 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoRevert part of r166049 back and enable test case in r166125.
Michael Liao [Wed, 17 Oct 2012 23:45:54 +0000 (23:45 +0000)]
Revert part of r166049 back and enable test case in r166125.

- Folding (trunc (concat ... X )) to (concat ... (trunc X) ...) is valid
  when '...' are all 'undef's.
- r166125 relies on this transformation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166155 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoLoopVectorize.cpp: Fix a warning. [-Wunused-variable]
NAKAMURA Takumi [Wed, 17 Oct 2012 23:40:15 +0000 (23:40 +0000)]
LoopVectorize.cpp: Fix a warning. [-Wunused-variable]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166153 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoDisable extract-concat test case temporarily
Michael Liao [Wed, 17 Oct 2012 23:08:19 +0000 (23:08 +0000)]
Disable extract-concat test case temporarily

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166141 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoRemove redundant SetInsertPoint call.
Jakub Staszak [Wed, 17 Oct 2012 23:06:37 +0000 (23:06 +0000)]
Remove redundant SetInsertPoint call.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166138 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoRevert r166049
Michael Liao [Wed, 17 Oct 2012 22:41:15 +0000 (22:41 +0000)]
Revert r166049

- In general, it's unsafe for this transformation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166135 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoAdd conditional branch instructions and their patterns.
Reed Kotler [Wed, 17 Oct 2012 22:29:54 +0000 (22:29 +0000)]
Add conditional branch instructions and their patterns.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166134 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoFix some typos and wrong indenting.
Roman Divacky [Wed, 17 Oct 2012 21:07:35 +0000 (21:07 +0000)]
Fix some typos and wrong indenting.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166128 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoTeach DAG combine to fold (extract_subvec (concat v1, ..) i) to v_i
Michael Liao [Wed, 17 Oct 2012 20:48:33 +0000 (20:48 +0000)]
Teach DAG combine to fold (extract_subvec (concat v1, ..) i) to v_i

- If the extracted vector has the same type of all vectored being concatenated
  together, it should be simplified directly into v_i, where i is the index of
  the element being extracted.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166125 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoSwitch MRI::UsedPhysRegs to a register unit bit vector.
Jakob Stoklund Olesen [Wed, 17 Oct 2012 20:26:33 +0000 (20:26 +0000)]
Switch MRI::UsedPhysRegs to a register unit bit vector.

This is a more compact, less redundant representation, and it avoids
scanning long lists of aliases for ARM D-registers, for example.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166124 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoUpdate the release notes about how to enable the loop vectorizer.
Nadav Rotem [Wed, 17 Oct 2012 19:49:21 +0000 (19:49 +0000)]
Update the release notes about how to enable the loop vectorizer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166123 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoAdd a really faster pre-RA scheduler (-pre-RA-sched=linearize). It doesn't use
Evan Cheng [Wed, 17 Oct 2012 19:39:36 +0000 (19:39 +0000)]
Add a really faster pre-RA scheduler (-pre-RA-sched=linearize). It doesn't use
any scheduling heuristics nor does it build up any scheduling data structure
that other heuristics use. It essentially linearize by doing a DFA walk but
it does handle glues correctly.

IMPORTANT: it probably can't handle all the physical register dependencies so
it's not suitable for x86. It also doesn't deal with dbg_value nodes right now
so it's definitely is still WIP.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166122 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoMerge MRI::isPhysRegOrOverlapUsed() into isPhysRegUsed().
Jakob Stoklund Olesen [Wed, 17 Oct 2012 18:44:18 +0000 (18:44 +0000)]
Merge MRI::isPhysRegOrOverlapUsed() into isPhysRegUsed().

All callers of these functions really want the isPhysRegOrOverlapUsed()
functionality which also checks aliases. For historical reasons, targets
without register aliases were calling isPhysRegUsed() instead.

Change isPhysRegUsed() to also check aliases, and switch all
isPhysRegOrOverlapUsed() callers to isPhysRegUsed().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166117 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoUpdate the release notes about the store-merge dag optimization.
Nadav Rotem [Wed, 17 Oct 2012 18:35:21 +0000 (18:35 +0000)]
Update the release notes about the store-merge dag optimization.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166116 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoUpdate the release notes about the new TargetTransformInfo API changes.
Nadav Rotem [Wed, 17 Oct 2012 18:33:50 +0000 (18:33 +0000)]
Update the release notes about the new TargetTransformInfo API changes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166115 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoUpdate the release notes about the new loop vectorizer.
Nadav Rotem [Wed, 17 Oct 2012 18:30:09 +0000 (18:30 +0000)]
Update the release notes about the new loop vectorizer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166113 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoAdd a loop vectorizer.
Nadav Rotem [Wed, 17 Oct 2012 18:25:06 +0000 (18:25 +0000)]
Add a loop vectorizer.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166112 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoCheck for empty YMM use-def lists in X86VZeroUpper.
Jakob Stoklund Olesen [Wed, 17 Oct 2012 17:52:35 +0000 (17:52 +0000)]
Check for empty YMM use-def lists in X86VZeroUpper.

The previous MRI.isPhysRegUsed(YMM0) would also return true when the
function contains a call to a function that may clobber YMM0. That's
most of them.

Checking the use-def chains allows us to skip functions that don't
explicitly mention YMM registers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166110 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoFix fallout from RegInfo => FrameLowering refactoring on MSP430.
Anton Korobeynikov [Wed, 17 Oct 2012 17:37:11 +0000 (17:37 +0000)]
Fix fallout from RegInfo => FrameLowering refactoring on MSP430.
Patch by Job Noorman!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166108 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agomisched: Better handling of invalid latencies in the machine model
Andrew Trick [Wed, 17 Oct 2012 17:27:10 +0000 (17:27 +0000)]
misched: Better handling of invalid latencies in the machine model

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166107 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agodocs: Add link to integrated assembler HowTo
Sean Silva [Wed, 17 Oct 2012 16:36:27 +0000 (16:36 +0000)]
docs: Add link to integrated assembler HowTo

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166106 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoSupport: Don't remove special files on signals.
Daniel Dunbar [Wed, 17 Oct 2012 16:30:54 +0000 (16:30 +0000)]
Support: Don't remove special files on signals.
 - Similar to Path::eraseFromDisk(), we don't want LLVM to remove things like
   /dev/null, even if it has the permission.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166105 91177308-0d34-0410-b5e6-96231b3b80d8

9 years ago[asan] better debug diagnostics in asan compiler module
Kostya Serebryany [Wed, 17 Oct 2012 13:40:06 +0000 (13:40 +0000)]
[asan] better debug diagnostics in asan compiler module

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166102 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoThis just in, it is a *bad idea* to use 'udiv' on an offset of
Chandler Carruth [Wed, 17 Oct 2012 09:23:48 +0000 (09:23 +0000)]
This just in, it is a *bad idea* to use 'udiv' on an offset of
a pointer. A very bad idea. Let's not do that. Fixes PR14105.

Note that this wasn't *that* glaring of an oversight. Originally, these
routines were only called on offsets within an alloca, which are
intrinsically positive. But over the evolution of the pass, they ended
up being called for arbitrary offsets, and things went downhill...

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166095 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoMarked this variable as 'used' so that LTO doesn't get rid of it.
Bill Wendling [Wed, 17 Oct 2012 08:08:06 +0000 (08:08 +0000)]
Marked this variable as 'used' so that LTO doesn't get rid of it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166092 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoFix a really annoying "bug" introduced in r165941. The change from that
Chandler Carruth [Wed, 17 Oct 2012 07:22:16 +0000 (07:22 +0000)]
Fix a really annoying "bug" introduced in r165941. The change from that
revision makes no sense. We cannot use the address space of the *post
indexed* type to conclude anything about a *pre indexed* pointer type's
size. More importantly, this index can never be over a pointer. We are
indexing over arrays and vectors here.

Of course, I have no test case here. Neither did the original patch. =/

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166091 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoRemove LLVM_DELETED_FUNCTION from destructors that override non-deleted base class...
Craig Topper [Wed, 17 Oct 2012 05:15:58 +0000 (05:15 +0000)]
Remove LLVM_DELETED_FUNCTION from destructors that override non-deleted base class destructors. This isn't legal by the C++11 standard and clang now checks for it. Curiously gcc didn't catch this, possibly because of the template usage.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166089 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoCheck SSSE3 instead of SSE4.1
Michael Liao [Wed, 17 Oct 2012 03:59:18 +0000 (03:59 +0000)]
Check SSSE3 instead of SSE4.1

- All shuffle insns required, especially PSHUB, are added in SSSE3.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166086 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoFix setjmp on models with non-Small code model nor non-Static relocation model
Michael Liao [Wed, 17 Oct 2012 02:22:27 +0000 (02:22 +0000)]
Fix setjmp on models with non-Small code model nor non-Static relocation model

- MBB address is only valid as an immediate value in Small & Static
  code/relocation models. On other models, LEA is needed to load IP address of
  the restore MBB.
- A minor fix of MBB in MC lowering is added as well to enable target
  relocation flag being propagated into MC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166084 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoUse a SparseSet instead of a BitVector for UsedInInstr in RAFast.
Jakob Stoklund Olesen [Wed, 17 Oct 2012 01:37:59 +0000 (01:37 +0000)]
Use a SparseSet instead of a BitVector for UsedInInstr in RAFast.

This is just as fast, and it makes it possible to avoid leaking the
UsedPhysRegs BitVector implementation through

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166083 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoUse a typedef to reduce some typing and reformat code accordingly.
Eric Christopher [Tue, 16 Oct 2012 23:46:25 +0000 (23:46 +0000)]
Use a typedef to reduce some typing and reformat code accordingly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166077 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoVariable name cleanup.
Eric Christopher [Tue, 16 Oct 2012 23:46:23 +0000 (23:46 +0000)]
Variable name cleanup.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166076 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoFormatting and 80-col.
Eric Christopher [Tue, 16 Oct 2012 23:46:21 +0000 (23:46 +0000)]
Formatting and 80-col.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166075 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoSpacing.
Eric Christopher [Tue, 16 Oct 2012 23:46:19 +0000 (23:46 +0000)]

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166074 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoAvoid rematerializing a redef immediately after the old def.
Jakob Stoklund Olesen [Tue, 16 Oct 2012 22:51:58 +0000 (22:51 +0000)]
Avoid rematerializing a redef immediately after the old def.

PR14098 contains an example where we would rematerialize a MOV8ri
immediately after the original instruction:

  %vreg7:sub_8bit<def> = MOV8ri 9; GR32_ABCD:%vreg7
  %vreg22:sub_8bit<def> = MOV8ri 9; GR32_ABCD:%vreg7

Besides being pointless, it is also wrong since the original instruction
only redefines part of the register, and the value read by the new
instruction is wrong.

The problem was the LiveRangeEdit::allUsesAvailableAt() didn't
special-case OrigIdx == UseIdx and found the wrong SSA value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166068 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoRevert r166046 "Switch back to the old coalescer for now to fix the 32 bit bit"
Jakob Stoklund Olesen [Tue, 16 Oct 2012 22:51:55 +0000 (22:51 +0000)]
Revert r166046 "Switch back to the old coalescer for now to fix the 32 bit bit"

A fix for PR14098, including the test case is in the next commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166067 91177308-0d34-0410-b5e6-96231b3b80d8

9 years ago[InstCombine] Teach InstCombine how to handle an obfuscated splat.
Michael Gottesman [Tue, 16 Oct 2012 21:29:38 +0000 (21:29 +0000)]
[InstCombine] Teach InstCombine how to handle an obfuscated splat.

An obfuscated splat is where the frontend poorly generates code for a splat
using several different shuffles to create the splat, i.e.,

  %A = load <4 x float>* %in_ptr, align 16
  %B = shufflevector <4 x float> %A, <4 x float> undef, <4 x i32> <i32 0, i32 0, i32 undef, i32 undef>
  %C = shufflevector <4 x float> %B, <4 x float> %A, <4 x i32> <i32 0, i32 1, i32 4, i32 undef>
  %D = shufflevector <4 x float> %C, <4 x float> %A, <4 x i32> <i32 0, i32 1, i32 2, i32 4>

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166061 91177308-0d34-0410-b5e6-96231b3b80d8

9 years ago[ms-inline asm] Add the helper function, isParseringInlineAsm(). To be used in a...
Chad Rosier [Tue, 16 Oct 2012 20:16:20 +0000 (20:16 +0000)]
[ms-inline asm] Add the helper function, isParseringInlineAsm(). To be used in a future commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166054 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoSimplify code. No functionality change.
Jakub Staszak [Tue, 16 Oct 2012 19:52:32 +0000 (19:52 +0000)]
Simplify code. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166053 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoCheck .rela instead of ELF64 for the compensation vaue resetting
Michael Liao [Tue, 16 Oct 2012 19:49:51 +0000 (19:49 +0000)]
Check .rela instead of ELF64 for the compensation vaue resetting

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166051 91177308-0d34-0410-b5e6-96231b3b80d8

9 years ago80-col fixup.
Jakub Staszak [Tue, 16 Oct 2012 19:39:40 +0000 (19:39 +0000)]
80-col fixup.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166050 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoTeach DAG combine to fold (trunc (fptoXi x)) to (fptoXi x)
Michael Liao [Tue, 16 Oct 2012 19:38:35 +0000 (19:38 +0000)]
Teach DAG combine to fold (trunc (fptoXi x)) to (fptoXi x)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166049 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoSwitch back to the old coalescer for now to fix the 32 bit bit
Rafael Espindola [Tue, 16 Oct 2012 19:34:06 +0000 (19:34 +0000)]
Switch back to the old coalescer for now to fix the 32 bit bit
llvm+clang+compiler-rt bootstrap.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166046 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoSimplify potentially quadratic behavior while erasing elements from std::vector.
Jakub Staszak [Tue, 16 Oct 2012 19:32:31 +0000 (19:32 +0000)]
Simplify potentially quadratic behavior while erasing elements from std::vector.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166045 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoAnd now we can call the other 'get' method from this one and not duplicate the code.
Bill Wendling [Tue, 16 Oct 2012 18:20:09 +0000 (18:20 +0000)]
And now we can call the other 'get' method from this one and not duplicate the code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166037 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoSupport v8f32 to v8i8/vi816 conversion through custom lowering
Michael Liao [Tue, 16 Oct 2012 18:14:11 +0000 (18:14 +0000)]
Support v8f32 to v8i8/vi816 conversion through custom lowering

- Add custom FP_TO_SINT on v8i16 (and v8i8 which is legalized as v8i16 due to
  vector element-wise widening) to reduce DAG combiner and its overhead added
  in X86 backend.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166036 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoUse the appropriate Attributes::get method to create an Attributes object.
Bill Wendling [Tue, 16 Oct 2012 18:06:06 +0000 (18:06 +0000)]
Use the appropriate Attributes::get method to create an Attributes object.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166035 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoSpeculative fix the mask constants to be of type uintptr_t. I don't know of any...
Owen Anderson [Tue, 16 Oct 2012 17:10:33 +0000 (17:10 +0000)]
Speculative fix the mask constants to be of type uintptr_t.  I don't know of any case where the old form was incorrect, but I'm more confident that such cases don't exist in this version.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166031 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoFix function parameter spelling in comments. Caught by -Wdocumentation.
Dmitri Gribenko [Tue, 16 Oct 2012 15:37:50 +0000 (15:37 +0000)]
Fix function parameter spelling in comments.  Caught by -Wdocumentation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166024 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoThis patch addresses PR13949.
Bill Schmidt [Tue, 16 Oct 2012 13:30:53 +0000 (13:30 +0000)]
This patch addresses PR13949.

For the PowerPC 64-bit ELF Linux ABI, aggregates of size less than 8
bytes are to be passed in the low-order bits ("right-adjusted") of the
doubleword register or memory slot assigned to them.  A previous patch
addressed this for aggregates passed in registers.  However, small
aggregates passed in the overflow portion of the parameter save area are
still being passed left-adjusted.

The fix is made in PPCTargetLowering::LowerCall_Darwin_Or_64SVR4 on the
caller side, and in PPCTargetLowering::LowerFormalArguments_64SVR4 on
the callee side.  The main fix on the callee side simply extends
existing logic for 1- and 2-byte objects to 1- through 7-byte objects,
and correcting a constant left over from 32-bit code.  There is also a
fix to a bogus calculation of the offset to the following argument in
the parameter save area.

On the caller side, again a constant left over from 32-bit code is
fixed.  Additionally, some code for 1, 2, and 4-byte objects is
duplicated to handle the 3, 5, 6, and 7-byte objects for SVR4 only.  The
LowerCall_Darwin_Or_64SVR4 logic is getting fairly convoluted trying to
handle both ABIs, and I propose to separate this into two functions in a
future patch, at which time the duplication can be removed.

The patch adds a new test (structsinmem.ll) to demonstrate correct
passing of structures of all seven sizes.  Eight dummy parameters are
used to force these structures to be in the overflow portion of the
parameter save area.

As a side effect, this corrects the case when aggregates passed in
registers are saved into the first eight doublewords of the parameter
save area:  Previously they were stored left-justified, and now are
properly stored right-justified.  This requires changing the expected
output of existing test case structsinregs.ll.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166022 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoIssue:
Stepan Dyatkovskiy [Tue, 16 Oct 2012 07:16:47 +0000 (07:16 +0000)]
Stack is formed improperly for long structures passed as byval arguments for
EABI mode.

If we took AAPCS reference, we can found the next statements:

A: "If the argument requires double-word alignment (8-byte), the NCRN (Next
Core Register Number) is rounded up to the next even register number." (5.5
Parameter Passing, Stage C, C.3).

B: "The alignment of an aggregate shall be the alignment of its most-aligned
component." (4.3 Composite Types, 4.3.1 Aggregates).

So if we have structure with doubles (9 double fields) and 3 Core unused
registers (r1, r2, r3): caller should use r2 and r3 registers only.
Currently r1,r2,r3 set is used, but it is invalid.

Callee VA routine should also use r2 and r3 regs only. All is ok here. This
behaviour is guessed by rounding up SP address with ADD+BFC operations.

Main fix is in ARMTargetLowering::HandleByVal. If we detected AAPCS mode and
8 byte alignment, we waste odd registers then.

I also improved LDRB_POST_IMM regression test. Since ldrb instruction will
not generated by current regression test after this patch.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166018 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoReapply r165661, Patch by Shuxin Yang <shuxin.llvm@gmail.com>.
NAKAMURA Takumi [Tue, 16 Oct 2012 06:28:34 +0000 (06:28 +0000)]
Reapply r165661, Patch by Shuxin Yang <shuxin.llvm@gmail.com>.

Original message:

The attached is the fix to radar://11663049. The optimization can be outlined by following rules:

   (select (x != c), e, c) -> select (x != c), e, x),
   (select (x == c), c, e) -> select (x == c), x, e)
where the <c> is an integer constant.

 The reason for this change is that : on x86, conditional-move-from-constant needs two instructions;
however, conditional-move-from-register need only one instruction.

  While the LowerSELECT() sounds to be the most convenient place for this optimization, it turns out to be a bad place. The reason is that by replacing the constant <c> with a symbolic value, it obscure some instruction-combining opportunities which would otherwise be very easy to spot. For that reason, I have to postpone the change to last instruction-combining phase.

  The change passes the test of "make check-all -C <build-root/test" and "make -C project/test-suite/SingleSource".

Original message since r165661:

My previous change has a bug: I negated the condition code of a CMOV, and go ahead creating a new CMOV using the *ORIGINAL* condition code.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166017 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoCleanup whitespace.
Bill Wendling [Tue, 16 Oct 2012 06:10:45 +0000 (06:10 +0000)]
Cleanup whitespace.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166016 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoFix a bug in the set(I,E)/reset(I,E) methods that I recently added. The boundary...
Owen Anderson [Tue, 16 Oct 2012 06:04:27 +0000 (06:04 +0000)]
Fix a bug in the set(I,E)/reset(I,E) methods that I recently added.  The boundary condition for checking if I and E were in the same word were incorrect, and, beyond that, the mask computation was not using a wide enough constant.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166015 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoMove X86MCInstLower class definition into implementation file. It's not needed outside.
Craig Topper [Tue, 16 Oct 2012 06:01:50 +0000 (06:01 +0000)]
Move X86MCInstLower class definition into implementation file. It's not needed outside.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166014 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoCleanup whitespace.
Bill Wendling [Tue, 16 Oct 2012 06:01:44 +0000 (06:01 +0000)]
Cleanup whitespace.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166013 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoHave AttributesImpl defriend the Attributes class.
Bill Wendling [Tue, 16 Oct 2012 05:57:28 +0000 (05:57 +0000)]
Have AttributesImpl defriend the Attributes class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166012 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoHave AttrBuilder defriend the Attributes class.
Bill Wendling [Tue, 16 Oct 2012 05:55:09 +0000 (05:55 +0000)]
Have AttrBuilder defriend the Attributes class.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166011 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoUse the Attributes::get method which takes an AttrVal value directly to simplify...
Bill Wendling [Tue, 16 Oct 2012 05:23:31 +0000 (05:23 +0000)]
Use the Attributes::get method which takes an AttrVal value directly to simplify the code a bit. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166009 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoPut simple c'tors inline.
Bill Wendling [Tue, 16 Oct 2012 05:22:28 +0000 (05:22 +0000)]
Put simple c'tors inline.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166008 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoPass in the context to the Attributes::get method.
Bill Wendling [Tue, 16 Oct 2012 05:20:51 +0000 (05:20 +0000)]
Pass in the context to the Attributes::get method.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166007 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoFix filename in file header.
Craig Topper [Tue, 16 Oct 2012 02:21:30 +0000 (02:21 +0000)]
Fix filename in file header.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166004 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoFix the cpu name and add -verify-machineinstrs.
Rafael Espindola [Tue, 16 Oct 2012 01:13:06 +0000 (01:13 +0000)]
Fix the cpu name and add -verify-machineinstrs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166003 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agomisched: Added handleMove support for updating all kill flags, not just for allocatab...
Andrew Trick [Tue, 16 Oct 2012 00:22:51 +0000 (00:22 +0000)]
misched: Added handleMove support for updating all kill flags, not just for allocatable regs.

This is a medium term workaround until we have a more robust solution
in the form of a register liveness utility for postRA passes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@166001 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoRemove unused BitVectors from getAllocatableSet().
Jakob Stoklund Olesen [Tue, 16 Oct 2012 00:05:06 +0000 (00:05 +0000)]
Remove unused BitVectors from getAllocatableSet().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165999 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoLTO also needs to initialize the TargetTransform infrastructure.
Nadav Rotem [Mon, 15 Oct 2012 22:50:02 +0000 (22:50 +0000)]
LTO also needs to initialize the TargetTransform infrastructure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165997 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoRemove RegisterClassInfo::isReserved() and isAllocatable().
Jakob Stoklund Olesen [Mon, 15 Oct 2012 22:41:03 +0000 (22:41 +0000)]
Remove RegisterClassInfo::isReserved() and isAllocatable().

Clients can use the equivalent functions in MRI.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165990 91177308-0d34-0410-b5e6-96231b3b80d8

9 years agoAdd __builtin_setjmp/_longjmp supprt in X86 backend
Michael Liao [Mon, 15 Oct 2012 22:39:43 +0000 (22:39 +0000)]
Add __builtin_setjmp/_longjmp supprt in X86 backend

- Besides used in SjLj exception handling, __builtin_setjmp/__longjmp is also
  used as a light-weight replacement of setjmp/longjmp which are used to
  implementation continuation, user-level threading, and etc. The support added
  in this patch ONLY addresses this usage and is NOT intended to support SjLj
  exception handling as zero-cost DWARF exception handling is used by default
  in X86.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165989 91177308-0d34-0410-b5e6-96231b3b80d8