llvm-svn: 68176

llvm-svn: 68175

llvm-svn: 68174

llvm-svn: 68173

llvm-svn: 68172

llvm-svn: 68171

llvm-svn: 68170

rdar://6740292

llvm-svn: 68169

Fix a bug (that I thought I had fixed already) where mangling a prefix could get us into an infinite loop

llvm-svn: 68168

llvm-svn: 68167

specifiers that terminate in a simple-template-id, e.g.,

  typename MetaFun::template apply<T1, T2>

Also, implement template instantiation for dependent
nested-name-specifiers that involve unresolved identifiers, e.g.,

  typename T::type::type

llvm-svn: 68166

llvm-svn: 68165

to generate PTH files. Soon we will remove from clang-cc the GCC-style '-x
c-header' interface for generating PTH files and push this logic to 'clang'.

llvm-svn: 68164

* Simplified if statement

llvm-svn: 68163

llvm-svn: 68162

 - Notably, set section on cfstring literal string data (for now, this
   is done everywhere because it matches what we were already doing
   for the CFString data itself)

 - <rdar://problem/6599098> [irgen] linker requires objc string data
   to go into cstring

llvm-svn: 68160

llvm-svn: 68159

llvm-svn: 68158

llvm-svn: 68157

it be an LLVM IR User object.

llvm-svn: 68156

attribute(used) and asm renaming are used together.

llvm-svn: 68155

llvm-svn: 68151

if it dangles.

llvm-svn: 68150

which are effectively smart pointers to Value*'s.  They are both very light
weight and simple, and react to values being destroyed or being RAUW'd.

WeakVN does a best effort to follow a value around, including through RAUW 
operations and will get nulled out of the value is destroyed.  This is useful
for the eventual "metadata that references a value" work, because it is a
reference to a value that does not show up on its use_* list.

AssertingVH is a pointer that compiles down to a dumb raw pointer when 
assertions are disabled.  When enabled, it emits an assertion if the 
pointed-to value is destroyed while it is still being referenced.  This
is very useful for Maps and other things, and should have caught the recent
bugs in CallGraph and Reassociate, for example.

llvm-svn: 68149

 - PR3875.
 - <rdar://problem/6615249> [driver] ccc should support some form of
   --help

llvm-svn: 68148

llvm-svn: 68147

Also, removed default value for getOptionMetaVar.

llvm-svn: 68146

llvm-svn: 68145

the preprocessor.
 - PR3602.

 - As is inherent in the blanket forwarding options, this will only
   work if clang-cc happens to accept what the user passed. Users by
   and large should use driver options to interact with the
   preprocessor, if at all possible.

llvm-svn: 68144

Throttle back "fold select into operand" transformation. InstCombine should not generate selects of two constants unless they are selects of 0 and 1.

e.g.
define i32 @t1(i32 %c, i32 %x) nounwind {
       %t1 = icmp eq i32 %c, 0
       %t2 = lshr i32 %x, 18
       %t3 = select i1 %t1, i32 %t2, i32 %x
       ret i32 %t3
}

was turned into

define i32 @t2(i32 %c, i32 %x) nounwind {
       %t1 = icmp eq i32 %c, 0
       %t2 = select i1 %t1, i32 18, i32 0
       %t3 = lshr i32 %x, %t2
       ret i32 %t3
}

For most targets, that means materializing two constants and then a select. e.g. On x86-64

movl    %esi, %eax
shrl    $18, %eax
testl   %edi, %edi
cmovne  %esi, %eax
ret

=>

xorl    %eax, %eax
testl   %edi, %edi
movl    $18, %ecx
cmovne  %eax, %ecx
movl    %esi, %eax
shrl    %cl, %eax
ret

Also, the optimizer and codegen can reason about shl / and / add, etc. by a constant. This optimization will hinder optimizations using ComputeMaskedBits.

llvm-svn: 68142

refactoring to make this possible (no functionality change).

llvm-svn: 68141

llvm-svn: 68140

 - Currently unused.

And yes, now may be about the time I want a TableGen backend.

llvm-svn: 68139

llvm-svn: 68138

llvm-svn: 68136

llvm-svn: 68134

llvm-svn: 68133

 - Current return-arguments-32 status: 15/1000 failures

llvm-svn: 68132

low-level frontend driver.

llvm-svn: 68131

llvm-svn: 68130