Tested that MinGW/MSYS builds fine without that.

llvm-svn: 128033

Move the dynamic linking functionality of the llvm-rtdyld program into an
ExecutionEngine support library. Update llvm-rtdyld to just load an object
file into memory, use the library to process it, then run the _main()
function, if one is found.

llvm-svn: 128031

llvm-svn: 128030

llvm-svn: 128028

llvm-svn: 128027

llvm-svn: 128020

llvm-svn: 128017

Provide a means for CrashRecovery clients to determine if code is currently running while crash recovery cleanups are being processed.

llvm-svn: 128008

llvm-svn: 128007

llvm-svn: 128005

llvm-svn: 128004

llvm-svn: 128002

llvm-svn: 127997

code below it. Even though it looks very similar, it will match more precisely
and geneate better functions in the long run.

llvm-svn: 127991

This is a helper class that will make it easier to say which InstAliases can be
printed and which cannot (because of ambiguity).

llvm-svn: 127990

* Move the code that emits the reg in reg class matching into its own function.

llvm-svn: 127988

the alias of an InstAlias instead of the thing being aliased. Because we need to
know the features that are valid for an InstAlias.

This is part of a work-in-progress.

llvm-svn: 127986

As suggested by Nick Lewycky, ignore debugging intrinsics when trying to decide whether a destructor is empty or not.

llvm-svn: 127985

llvm-svn: 127984

llvm-svn: 127982

Re-apply r127953 with fixes: eliminate empty return block if it has no predecessors; update dominator tree if cfg is modified.

llvm-svn: 127981

llvm-svn: 127976

llvm-svn: 127975

llvm-svn: 127974

llvm-svn: 127973

gun as does. This makes it a lot easier to compare the output of both
as the addresses are now a lot closer.

llvm-svn: 127972

Add an optimization to GlobalOpt that eliminates calls to __cxa_atexit, if the function passed is empty.

llvm-svn: 127970

- glibc falls back to fork+exec if a file actions object is present.
- On BSDs this saves a malloc.

llvm-svn: 127969

If a class inherits from RefCountedBaseVPTR allow all its subclasses to be used with IntrusiveRefCntPtr.

llvm-svn: 127966

This can happen when multiple sibling registers are spilled after live range
splitting.

llvm-svn: 127965

llvm-svn: 127964

llvm-svn: 127962

llvm-svn: 127960

llvm-svn: 127959

Some of those POSIX <-> Windows command line conversions ended on
failure.

llvm-svn: 127958

llvm-svn: 127957

llvm-svn: 127956

to canonicalize IR", it broke a lot of things.

llvm-svn: 127954

to have single return block (at least getting there) for optimizations. This
is general goodness but it would prevent some tailcall optimizations.
One specific case is code like this:
int f1(void);
int f2(void);
int f3(void);
int f4(void);
int f5(void);
int f6(void);
int foo(int x) {
  switch(x) {
  case 1: return f1();
  case 2: return f2();
  case 3: return f3();
  case 4: return f4();
  case 5: return f5();
  case 6: return f6();
  }
}

=>
LBB0_2:                                 ## %sw.bb
  callq   _f1
  popq    %rbp
  ret
LBB0_3:                                 ## %sw.bb1
  callq   _f2
  popq    %rbp
  ret
LBB0_4:                                 ## %sw.bb3
  callq   _f3
  popq    %rbp
  ret

This patch teaches codegenprep to duplicate returns when the return value
is a phi and where the phi operands are produced by tail calls followed by
an unconditional branch:

sw.bb7:                                           ; preds = %entry
  %call8 = tail call i32 @f5() nounwind
  br label %return
sw.bb9:                                           ; preds = %entry
  %call10 = tail call i32 @f6() nounwind
  br label %return
return:
  %retval.0 = phi i32 [ %call10, %sw.bb9 ], [ %call8, %sw.bb7 ], ... [ 0, %entry ]
  ret i32 %retval.0

This allows codegen to generate better code like this:

LBB0_2:                                 ## %sw.bb
        jmp     _f1                     ## TAILCALL
LBB0_3:                                 ## %sw.bb1
        jmp     _f2                     ## TAILCALL
LBB0_4:                                 ## %sw.bb3
        jmp     _f3                     ## TAILCALL

rdar://9147433

llvm-svn: 127953

llvm-svn: 127952