Re-commit r192758 - MC: quote tricky symbol names in asm output

The reason this got reverted was that the @feat.00 symbol which was emitted
for every TU became quoted, and on cygwin/mingw we use the gas assembler which
couldn't handle the quotes.

This commit fixes the problem by only emitting @feat.00 for win32, where we use
clang -cc1as to assemble. gas would just drop this symbol anyway, so there is no
loss there.

With @feat.00 gone, there shouldn't be quoted symbols showing up on cygwin since
it uses the Itanium ABI, which doesn't put these funny characters in symbols.

> Because of win32 mangling, we produce symbol and section names with
> funny characters in them, most notably @ characters.
>
> MC would choke on trying to parse its own assembly output. This patch addresses
> that by:
>
> - Making @ trigger quoting of symbol names
> - Also quote section names in the same way
> - Just parse section names like other identifiers (to allow for quotes)
> - Don't assume @ signifies a symbol variant if it is in a string.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192859 91177308-0d34-0410-b5e6-96231b3b80d8
Add the subprogram DIEs to the context they're created with only
if they're a declaration, otherwise they're owned by the compile
unit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192861 91177308-0d34-0410-b5e6-96231b3b80d8
[projects/test-suite] White space and long line fixes.

No functionality changes.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192863 91177308-0d34-0410-b5e6-96231b3b80d8
Expose install_fatal_error_handler() through the C API.

I expose the API with some caveats:

- The C++ API involves a traditional void* opaque pointer for the fatal 
error callback.  The C API doesn’t do this.  I don’t think that the void* 
opaque pointer makes any sense since this is a global callback - there will 
only be one of them.  So if you need to pass some data to your callback, 
just put it in a global variable.

- The bindings will ignore the gen_crash_diag boolean.  I ignore it because 
(1) I don’t know what it does, (2) it’s not documented AFAIK, and (3) I 
couldn’t imagine any use for it.  I made the gut call that it probably 
wasn’t important enough to expose through the C API.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192864 91177308-0d34-0410-b5e6-96231b3b80d8
According to the dwarf standard pubnames and pubtypes for languages
like C++ should be the fully qualified names for the type.

Add a routine that does a language specific context walk to build
up the qualified name and use it when we add types/names to the
tables. Expand the gnu pubnames testcase as it's the most complex
to make sure that qualified types are also being added.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192865 91177308-0d34-0410-b5e6-96231b3b80d8
x86: Move bitcasts outside concat_vector.

Consider the following:

typedef unsigned short ushort4U __attribute__((ext_vector_type(4),
aligned(2)));
typedef unsigned short ushort4 __attribute__((ext_vector_type(4)));
typedef unsigned short ushort8 __attribute__((ext_vector_type(8)));
typedef int int4 __attribute__((ext_vector_type(4)));

int4 __bbase_cvt_int(ushort4 v) {
  ushort8 a;
  a.lo = v;
  return _mm_cvtepu16_epi32(a);
}

This generates the, not unreasonable, IR:
define <4 x i32> @foo0(double %v.coerce) nounwind ssp {
  %tmp = bitcast double %v.coerce to <4 x i16>
  %tmp1 = shufflevector <4 x i16> %tmp, <4 x i16> undef, <8 x i32> <i32
  %0, i32 1, i32 2, i32 3, i32 undef, i32 undef, i32 undef, i32 undef>
  %tmp2 = tail call <4 x i32> @llvm.x86.sse41.pmovzxwd(<8 x i16> %tmp1)
  ret <4 x i32> %tmp2
}

The problem is when type legalization gets hold of the v4i16. It
legalizes that by spilling to the stack, then doing a zero-extending
load. Things go even more silly from there, ending up with something
like:
_foo0:
  movsd %xmm0, -8(%rsp)       <== Spill to the stack.
  movq  -8(%rsp), %xmm0       <== Reload it right back out.
  pmovzxwd  %xmm0, %xmm1      <== Here's what we actually asked for.
  pblendw $1, %xmm1, %xmm0    <== We don't need this at all
  pmovzxwd  %xmm0, %xmm0      <== We already did this
  ret

The v8i8 to v8i16 zext intrinsic gives even worse results, with two
table lookups via pshufb instructions(!!).

To avoid all that, we can move the bitcasting until after we've formed
the wider (legal) vector type. Then our normal codegen flows along
nicely and we get the expected:
_foo0:
  pmovzxwd  %xmm0, %xmm0
  ret

rdar://15245794

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192866 91177308-0d34-0410-b5e6-96231b3b80d8
tsan: implement no_sanitize_thread attribute
If a function has no_sanitize_thread attribute,
do not instrument memory accesses in it.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192871 91177308-0d34-0410-b5e6-96231b3b80d8
llvm-c: Return NULL from LLVMGetFirstTarget instead of asserting

If no targets are registered, LLVMGetFirstTarget currently fails with
an assertion. This patch makes it return NULL instead, similarly to
how LLVMGetNextTarget would.

Patch by Peter Zotov

Differential Revision: http://llvm-reviews.chandlerc.com/D1908



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192878 91177308-0d34-0410-b5e6-96231b3b80d8
Changing DebugInfoFinder to iterate over all the compile units.
Solves http://llvm.org/bugs/show_bug.cgi?id=17507

Committed on behalf of alon.mishne@intel.com

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192879 91177308-0d34-0410-b5e6-96231b3b80d8
[mips][msa] Correct definition order of ftrunc_[su], ftint_[su], and ftq.

Define these three instructions in alphabetical order (like the rest of the
file).
No functional change.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192880 91177308-0d34-0410-b5e6-96231b3b80d8
llvm-c: Don't assert in LLVMTargetMachineEmitToFile on nonexistent file

Error handling code for raw_fd_ostream constructor is present, but
never used, because formatted_raw_ostream will always assert on closed
fd's before.

Patch by Peter Zotov

Differential Revision: http://llvm-reviews.chandlerc.com/D1909



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192881 91177308-0d34-0410-b5e6-96231b3b80d8
[msan] Use zero-extension in shadow cast by default.

Switch to sign-extension in r192575 caused 7% perf loss on 482.sphinx3.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192882 91177308-0d34-0410-b5e6-96231b3b80d8
Fix edge condition in DAGCombiner to improve codegen of shift sequences.

When canonicalizing dags according to the rule
(shl (zext (shr X, c1) ), c1) ==> (zext (shl (shr X, c1), c1))

remember to add the new shl dag to the DAGCombiner worklist of nodes.
If we don't explicitly add it to the worklist of nodes to visit, we
may not trigger later on the rule that folds the shift left + logical
shift right into a AND instruction with bitmask.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192883 91177308-0d34-0410-b5e6-96231b3b80d8
Replace sra with srl if a single sign bit is required

E.g. (and (sra (i32 x) 31) 2) -> (and (srl (i32 x) 30) 2).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192884 91177308-0d34-0410-b5e6-96231b3b80d8
Lit: Introduce an environment variable, $LIT_PRESERVES_TMP, to preserve TMP (and TEMP).

This is intended to check how many temporary files would be generated in automated builders.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192887 91177308-0d34-0410-b5e6-96231b3b80d8
[mips][msa] Removed ldx.[bhwd] and stx.[bhwd].

These were present in a previous version of the MSA spec but are not
present in the published version. There is no hardware that uses these
instructions.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192888 91177308-0d34-0410-b5e6-96231b3b80d8
Fix r192888: test/CodeGen/Mips/msa/3r_ld_st.ll should have been deleted


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192889 91177308-0d34-0410-b5e6-96231b3b80d8
Fix tests not to depend on specific regalloc or instruction order.

They were failing with -mcpu=atom.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192890 91177308-0d34-0410-b5e6-96231b3b80d8
Lit: LIT_PRESERVES_TMP should be aware of TMPDIR, too.

TMPDIR is preferred in Unix.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192891 91177308-0d34-0410-b5e6-96231b3b80d8
[DebugInfo] Delete dead code, simplify and fix code style for some existing code. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@192894 91177308-0d34-0410-b5e6-96231b3b80d8