and extern_weak_odr.  These are the same as the non-odr versions,
except that they indicate that the global will only be overridden
by an *equivalent* global.  In C, a function with weak linkage can
be overridden by a function which behaves completely differently.
This means that IP passes have to skip weak functions, since any
deductions made from the function definition might be wrong, since
the definition could be replaced by something completely different
at link time.   This is not allowed in C++, thanks to the ODR
(One-Definition-Rule): if a function is replaced by another at
link-time, then the new function must be the same as the original
function.  If a language knows that a function or other global can
only be overridden by an equivalent global, it can give it the
weak_odr linkage type, and the optimizers will understand that it
is alright to make deductions based on the function body.  The
code generators on the other hand map weak and weak_odr linkage
to the same thing.

llvm-svn: 66339

suggested by Chris.

llvm-svn: 62099

adding a TargetMachine member to the base TargetAsmInfo class instead.

llvm-svn: 58624

instead of hasWeakLinkage in a bunch of optimization
passes.

llvm-svn: 56782

llvm-svn: 56582

llvm-svn: 56580

llvm-svn: 54534

It's not legal to output a GV in a coalesced section if it's used in an ARM PIC relative constantpool.

llvm-svn: 54519

llvm-svn: 54451

llvm-svn: 54350

llvm-svn: 54214

Fixed COMM asm directive usage.
ConstantPool using custom FourByteConstantSection.

llvm-svn: 54139

Added ConstantPool support.

llvm-svn: 53951

llvm-svn: 53912

Fixed small bug.

llvm-svn: 53908

Added gp_rel relocations to support addressing small section contents.
Added command line to specify small section threshold in bytes.

llvm-svn: 53869

llvm-svn: 53790

llvm-svn: 53585

Added HasABICall and HasAbsoluteCall (equivalent to gcc -mabicall and 
-mno-shared). HasAbsoluteCall is not implemented but HasABICall is the 
default for o32 ABI. Now, both should help into a more accurate 
relocation types implementation. 
Added IsLinux is needed to choose between asm directives.
Instruction name strings cleanup.
AsmPrinter improved.

llvm-svn: 53551

llvm-svn: 45418

providing a misleading facility. It's used once in the MIPS backend
and hardcoded as "\t.globl\t" everywhere else.

llvm-svn: 45338

Fixed some AsmPrinter issues
Added GLOBAL_OFFSET_TABLE Node handle.

llvm-svn: 44024

- Modifications from the last patch included
  (issues pointed by Evan Cheng are now fixed).
- Added more MipsI instructions.
- Added more patterns to match branch instructions.

llvm-svn: 37461