The analysis will be needed by both the greedy register allocator and the
X86FloatingPoint pass. It only needs to be computed once when the CFG doesn't
change.

This pass is very fast, usually showing up as 0.0% wall time.

llvm-svn: 122832

// rdar://8818375

llvm-svn: 122831

Reverting an old optimization that conflicts with the new allocator model, and causes some test casees to compile that shouldn't.

llvm-svn: 122830

warning is overzealous but gcc is what it is.)

llvm-svn: 122829

llvm-svn: 122828

llvm-svn: 122827

llvm-svn: 122826

llvm-svn: 122825

llvm-svn: 122824

Clarify terminology, settling on referring to what was the "number table" as the "leader table", and
rename methods to make it much more clear what they're doing.

llvm-svn: 122823

llvm-svn: 122822

case where a static caller is itself inlined everywhere else, and
thus may go away if it doesn't get too big due to inlining other
things into it.  If there are references to the caller other than
calls, it will not be removed; account for this.
This results in same-day completion of the case in PR8853.

llvm-svn: 122821

the switch-enum warnings. Test is forthcoming, once I've dealt with
some template argument deduction issues.

llvm-svn: 122820

Branch instructions don't produce values, so there's no need to generate a value number for them.  This
avoids adding them to the various value numbering tables, resulting in a minor (~3%) speedup for GVN
on 40.gcc.

llvm-svn: 122819

llvm-svn: 122818

llvm-svn: 122817

llvm-svn: 122816

llvm-svn: 122815

ashr's with huge shift amounts, PR8896

llvm-svn: 122814

parameter pack.

Note that we're missing proper libclang support for the new
SizeOfPackExpr expression node.

llvm-svn: 122813

llvm-svn: 122812

makes getLeader() nonrecursive.

llvm-svn: 122811

This ensures that always the recently compiled tools are picked for testing.

llvm-svn: 122810

llvm-svn: 122809

llvm-svn: 122808

Prefer getAs<ComplexType> rather than cast<ComplexType> on canonical type. Suggestion by Douglas Gregor!

llvm-svn: 122807

when safe.

The testcase is basically this nested loop:
void foo(char *X) {
  for (int i = 0; i != 100; ++i) 
    for (int j = 0; j != 100; ++j)
      X[j+i*100] = 0;
}

which gets turned into a single memset now.  clang -O3 doesn't optimize
this yet though due to a phase ordering issue I haven't analyzed yet.

llvm-svn: 122806

instruction *after* the store.  The store will always be deleted
if the transformation kicks in, so we'd do an N^2 scan of every
loop block.  Whoops.

llvm-svn: 122805

  int x = 42;
  x = x;  // Warns here.

The warning avoids macro expansions, templates, user-defined assignment
operators, and volatile types, so false positives are expected to be low.

The common (mis-)use of this code pattern is to silence unused variable
warnings, but a more idiomatic way of doing that is '(void)x;'.
A follow-up to this will add a note and fix-it hint suggesting this
replacement in cases where the StmtExpr consists precisely of the self
assignment.

llvm-svn: 122804

spent in StrongPHIElimination on 403.gcc.

llvm-svn: 122803

declaration name of the array when present. This ensures that
a poor-man's C++03 static_assert will include the user error message
often embedded in the name.

Update all the tests to reflect the new wording, and add a test for the
name behavior.

llvm-svn: 122802

CodeGenPrepare (which is the default behavior).

llvm-svn: 122801

were not being created in the proper way, meaning
results were getting lost.

llvm-svn: 122800

non-type template parameter pack, make sure to create a pack expansion
for the corresponding template argument.

llvm-svn: 122799

 

llvm-svn: 122797

Don't pattern match "/clang" so we don't mangle directory names.  Some
tests use absolute paths to clang.

llvm-svn: 122796

llvm-svn: 122795

llvm-svn: 122794

initialize those lovely mixins that come from pack expansions of base
specifiers.

llvm-svn: 122793

Rename MaybeSkipFunctionBodyForCodeCompletion -> trySkippingFunctionBodyForCodeCompletion and check isCodeCompletionEnabled() before doing the call.
Suggestions by Chris.

llvm-svn: 122792