to get important constant branch probabilities and use them for finding
the best branch out of a set of possibilities.

llvm-svn: 142762

llvm-svn: 142761

llvm-svn: 142760

llvm-svn: 142759

in-class member initialisers).

llvm-svn: 142758

llvm-svn: 142757

llvm-svn: 142756

instead of silently discarding them.

As a side effect, this improves diagnostics for constexpr class
templates slightly.

llvm-svn: 142755

Python.h includes a ton of macros that can cause weird behavior down the road.

llvm-svn: 142754

llvm-svn: 142753

50% is much more readable than 5.000000e-01.

llvm-svn: 142752

llvm-svn: 142751

-polly-detect-only=<functionname> allows to limit the scop detection to
a single function.

llvm-svn: 142750

llvm-svn: 142749

llvm-svn: 142748

llvm-svn: 142747

llvm-svn: 142746

llvm-svn: 142745

llvm-svn: 142744

discussions with Andy. Fundamentally, the previous algorithm is both
counter productive on several fronts and prioritizing things which
aren't necessarily the most important: static branch prediction.

The new algorithm uses the existing loop CFG structure information to
walk through the CFG itself to layout blocks. It coalesces adjacent
blocks within the loop where the CFG allows based on the most likely
path taken. Finally, it topologically orders the block chains that have
been formed. This allows it to choose a (mostly) topologically valid
ordering which still priorizes fallthrough within the structural
constraints.

As a final twist in the algorithm, it does violate the CFG when it
discovers a "hot" edge, that is an edge that is more than 4x hotter than
the competing edges in the CFG. These are forcibly merged into
a fallthrough chain.

Future transformations that need te be added are rotation of loop exit
conditions to be fallthrough, and better isolation of cold block chains.
I'm also planning on adding statistics to model how well the algorithm
does at laying out blocks based on the probabilities it receives.

The old tests mostly still pass, and I have some new tests to add, but
the nested loops are still behaving very strangely. This almost seems
like working-as-intended as it rotated the exit branch to be
fallthrough, but I'm not convinced this is actually the best layout. It
is well supported by the probabilities for loops we currently get, but
those are pretty broken for nested loops, so this may change later.

llvm-svn: 142743

llvm-svn: 142742

llvm-svn: 142741

element types, even though the element extraction code does. It is surprising
that this bug has been here for so long. Fixes <rdar://problem/10318778>.

llvm-svn: 142740

[analyzer] Remove LocationContext creation methods from AnalysisManager, and change clients to use AnalysisContext instead.

WIP to remove/reduce ExprEngine's usage of AnalysisManager.

llvm-svn: 142739

llvm-svn: 142738

llvm-svn: 142737

llvm-svn: 142736

elimination on them too.

llvm-svn: 142735

llvm-svn: 142734

const expression evaluation subclasses, and remove some APValue copying and
malloc traffic in the process.

llvm-svn: 142733

llvm-svn: 142732

able to constant fold load instructions where the argument is a constant.
Second, we should be able to watch multiple PHI nodes through the loop; this
patch only supports PHIs in loop headers, more can be done here.

With this patch, we now constant evaluate:
  static const int arr[] = {1, 2, 3, 4, 5};
  int test() {
    int sum = 0;
    for (int i = 0; i < 5; ++i) sum += arr[i];
    return sum;
  }

llvm-svn: 142731

llvm-svn: 142730

llvm-svn: 142729

llvm-svn: 142728

llvm-svn: 142727

llvm-svn: 142726

llvm-svn: 142725

SHL inserts zeros from the right, thus even when the original
sign_extend_inreg value was of 1-bit, we need to sra.

llvm-svn: 142724

Former RUN line does not make sense on Win32 hosts.
Win32 hosts would not be expected to set appropriate $PWD.

Latter RUN line might be made valid if PathV2::is_absolute("/foo") would be true. Unfortunately, "/foo" should not be treated as absolute path on Win32.

FYI, on mingw32 with MSYS bash (it has 'shell' feature);
Former) $PWD is set as "X:/hogehoge/test/Driver"
Latter) PWD=/foo sets "X:/root/to/msys/foo" to $PWD.

llvm-svn: 142721