[OCaml] Documentation improvements.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212048 91177308-0d34-0410-b5e6-96231b3b80d8
[X86] Add support for builtin to read performance monitoring counters.

This patch adds support for a new builtin instruction called
__builtin_ia32_rdpmc.

Builtin '__builtin_ia32_rdpmc' is defined as a 'GCC builtin'; on X86, it can
be used to read performance monitoring counters. It takes as input the index
of the performance counter to read, and returns the value of the specified
performance counter as a 64-bit number.

Calls to this new builtin will map to instruction RDPMC.
The index in input to the builtin call is moved to register %ECX. The result
of the builtin call is the value of the specified performance counter (RDPMC
would return that quantity in registers RDX:RAX).

This patch:
 - Adds builtin int_x86_rdpmc as a GCCBuiltin;
 - Adds a new x86 DAG node called 'RDPMC_DAG';
 - Teaches how to lower this new builtin;
 - Adds an ISel pattern to select instruction RDPMC;
 - Fixes the definition of instruction RDPMC adding %RAX and %RDX as
   implicit definitions, and adding %ECX as implicit use;
 - Adds a LLVM test to verify that the new builtin is correctly selected.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212049 91177308-0d34-0410-b5e6-96231b3b80d8
Debug info: split out complex DIVariable address expressions into a
separate MDNode so they can be uniqued via folding set magic. To conserve
space, DIVariable nodes are still variable-length, with the last two
fields being optional.

No functional change.
http://reviews.llvm.org/D3526

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212050 91177308-0d34-0410-b5e6-96231b3b80d8
R600: Remove unused declarations leftover from AMDIL

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212051 91177308-0d34-0410-b5e6-96231b3b80d8
R600: Move mul combine to separate function

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212052 91177308-0d34-0410-b5e6-96231b3b80d8
Add the -arch flag support to llvm-nm to select the slice out of a Mach-O
universal file.  This also includes support for -arch all, selecting the host
architecture by default from a universal file and checking if -arch is used
with a standard Mach-O it matches that architecture.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212054 91177308-0d34-0410-b5e6-96231b3b80d8
Build fix for systems without futimes/futimens

Some versions of Android don't have futimes/futimens and this code wasn't
updated during the recent errc refactoring.

Patch by Luqman Aden!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212055 91177308-0d34-0410-b5e6-96231b3b80d8
Fix 'platform-specific' hyphenations

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212056 91177308-0d34-0410-b5e6-96231b3b80d8
Refactor the code in clang to find a file in a PATH like environment variable into a helper function

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212057 91177308-0d34-0410-b5e6-96231b3b80d8
objdump: Add test for ELF file with no section table

This is a test for the fix in r211904.

Differential Revision: http://reviews.llvm.org/D4349


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212059 91177308-0d34-0410-b5e6-96231b3b80d8
msan: Stop stripping the 'tail' modifier off of calls

This probably isn't necessary since msan started to unpoison the return
value shadow memory before all calls.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212061 91177308-0d34-0410-b5e6-96231b3b80d8
Speculatively fix some code handling Power64 MachO files

MSVC was warning on a switch containing only default labels.  In this
instance, it looks like it uncovered a real bug.  :)

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212062 91177308-0d34-0410-b5e6-96231b3b80d8
Remove unnecessary datalayout string from a test case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212063 91177308-0d34-0410-b5e6-96231b3b80d8
DebugInfo: Preserve debug location information when transforming a call into an invoke during inlining.

This both improves basic debug info quality, but also fixes a larger
hole whenever we inline a call/invoke without a location (debug info for
the entire inlining is lost and other badness that the debug info
emission code is currently working around but shouldn't have to).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212065 91177308-0d34-0410-b5e6-96231b3b80d8
Convert some byval argpromotion grep tests to FileCheck

Surprisingly, the i32* byval parameter is not transformed by
argpromotion.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212067 91177308-0d34-0410-b5e6-96231b3b80d8
AArch64: Actually do address type promotion

AArch64AddressTypePromotion was doing nothing because it was using the
old semantics of `Use` and `uses()`, when it really wanted to get at the
`users()`.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212073 91177308-0d34-0410-b5e6-96231b3b80d8
AArch64: Follow-up to r212073

In r212073 I missed a call of `use_begin()` that assumed the wrong
semantics.  It's not clear to me at all what this code does without the
fix, so I'm not sure how to write a testcase.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212075 91177308-0d34-0410-b5e6-96231b3b80d8
Suppress inlining when the block address is taken

Inlining functions with block addresses can cause many problem and requires a
rich infrastructure to support including escape analysis.  At this point the
safest approach to address these problems is by blocking inlining from
happening.

Background:
There have been reports on Ruby segmentation faults triggered by inlining
functions with block addresses like

//Ruby code snippet
vm_exec_core() {
    finish_insn_seq_0 = &&INSN_LABEL_finish;
    INSN_LABEL_finish:
      ;
}

This kind of scenario can also happen when LLVM picks a subset of blocks for
inlining, which is the case with the actual code in the Ruby environment.

LLVM suppresses inlining for such functions when there is an indirect branch.
The attached patch does so even when there is no indirect branch.  Note that
user code like above would not make much sense: using the global for jumping
across function boundaries would be illegal.

Why was there a segfault:

In the snipped above the block with the label is recognized as dead So it is
eliminated. Instead of a block address the cloner stores a constant (sic!) into
the global resulting in the segfault (when the global is used in a goto).

Why had it worked in the past then:

By luck. In older versions vm_exec_core was also inlined but the label address
used was the block label address in vm_exec_core.  So the global jump ended up
in the original function rather than in the caller which accidentally happened
to work.

Test case ./tools/clang/test/CodeGen/indirect-goto.c will fail as a result
of this commit.

rdar://17245966



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212077 91177308-0d34-0410-b5e6-96231b3b80d8
IR: Add a helper to check for LinkOnceODRLinkage

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212078 91177308-0d34-0410-b5e6-96231b3b80d8
GlobalOpt: Handle non-zero offsets for aliases

An alias with an aliasee of a non-zero GEP is not trivially replacable
with it's aliasee.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@212079 91177308-0d34-0410-b5e6-96231b3b80d8