Support: add llvm::unique_lock

Based on the STL class of the same name, it guards a mutex
while also allowing it to be unlocked conditionally before
destruction.

This eliminates the last naked usages of mutexes in LLVM and
clang.

It also uncovered and fixed a bug in callExternalFunction()
when compiled without USE_LIBFFI, where the mutex would never
be unlocked if the end of the function was reached.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216338 91177308-0d34-0410-b5e6-96231b3b80d8
[PowerPC] Add support for dcbtst and icbt (prefetch)

Adds code generation support for dcbtst (data cache prefetch for write) and
icbt (instruction cache prefetch for read - Book E cores only).

We still end up with a 'cannot select' error for the non-supported prefetch
intrinsic forms. This will be fixed in a later commit.

Fixes PR20692.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216339 91177308-0d34-0410-b5e6-96231b3b80d8
InstCombine: Properly optimize or'ing bittests together

CFE, with -03, would turn:
bool f(unsigned x) {
  bool a = x & 1;
  bool b = x & 2;
  return a | b;
}

into:
  %1 = lshr i32 %x, 1
  %2 = or i32 %1, %x
  %3 = and i32 %2, 1
  %4 = icmp ne i32 %3, 0

This sort of thing exposes a nasty pathology in GCC, ICC and LLVM.

Instead, we would rather want:
  %1 = and i32 %x, 3
  %2 = icmp ne i32 %1, 0

Things get a bit more interesting in the following case:
  %1 = lshr i32 %x, %y
  %2 = or i32 %1, %x
  %3 = and i32 %2, 1
  %4 = icmp ne i32 %3, 0

Replacing it with the following sequence is better:
  %1 = shl nuw i32 1, %y
  %2 = or i32 %1, 1
  %3 = and i32 %2, %x
  %4 = icmp ne i32 %3, 0

This sequence is preferable because %1 doesn't involve %x and could
potentially be hoisted out of loops if it is invariant; only perform
this transform in the non-constant case if we know we won't increase
register pressure.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216343 91177308-0d34-0410-b5e6-96231b3b80d8
Silence gcc -Wpedantic.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216344 91177308-0d34-0410-b5e6-96231b3b80d8
X86 intrinsics table - simplifies intrinsics lowering.
The tables are initialized when X86TargetLowering object is created.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216345 91177308-0d34-0410-b5e6-96231b3b80d8
This code is from r216285, which did not go out to the mailing list for some reason.

The switch statement would never fire due to the preceding break statement. Also, the switch statement has a default label with no case labels. Simplified the code, and allow it to execute.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216346 91177308-0d34-0410-b5e6-96231b3b80d8
TableGen: use auto and for-range

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216348 91177308-0d34-0410-b5e6-96231b3b80d8
TableGen: delete no-op code

This does nothing but remove the Record from the map, and
then re-add it, without actually changing it in between.

The Record's Name used to be changed before re-adding it
when the code was first committed in r137232, but the
name-changing lines were removed in r142510, and since
then this code seems to do nothing.

This was also the only caller of removeClass or removeDef,
so now RecordKeeper owns its Records unconditionally,
and could be unique_ptr-ified.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216349 91177308-0d34-0410-b5e6-96231b3b80d8
TableGen: unique_ptr-ify RecordKeeper

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216350 91177308-0d34-0410-b5e6-96231b3b80d8
Use range based for loops to avoid needing to re-mention SmallPtrSet size.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216351 91177308-0d34-0410-b5e6-96231b3b80d8
IR: remove dead code

This was added in r134994, to fix a memory leak;
three days later, r135248 switched
ContainedTys from being new-allocated to being allocated
via BumpPtrAllocator, and the earlier fix was never
reverted.

The destructor doesn't seem to ever actually be called
on Types anyway, so it's harmless, but if it were,
this'd be an invalid pointer.

This reverts r134994.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216354 91177308-0d34-0410-b5e6-96231b3b80d8
CodeGen: switch raw array to std::vector

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216355 91177308-0d34-0410-b5e6-96231b3b80d8
Analysis: take a reference instead of pointer

This parameter is never null.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216356 91177308-0d34-0410-b5e6-96231b3b80d8
Analysis: unique_ptr-ify DependenceAnalysis::depends

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216357 91177308-0d34-0410-b5e6-96231b3b80d8
Analysis: unique_ptr-ify DependenceAnalysis::collectCoeffInfo

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216358 91177308-0d34-0410-b5e6-96231b3b80d8
Support/APFloat: unique_ptr-ify temp arrays

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216359 91177308-0d34-0410-b5e6-96231b3b80d8
Support/Path: remove raw delete

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216360 91177308-0d34-0410-b5e6-96231b3b80d8
EE/JIT: unique_ptr-ify

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216361 91177308-0d34-0410-b5e6-96231b3b80d8
ExecutionEngine: unique_ptr-ify

NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216362 91177308-0d34-0410-b5e6-96231b3b80d8
NVPTX: remove raw delete call

Also make members that are never accessed outside the class
private.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216363 91177308-0d34-0410-b5e6-96231b3b80d8