easier to debug, and to avoid complications when the CFG changes
in the middle of the instruction selection process.

llvm-svn: 119382

Always spill the full representative register at any point where any subregister
is live.

This fixes PR8620 which caused the old logic to get confused and not spill
anything at all.

The fundamental problem here is that the coalescer is too aggressive about
physical register coalescing. It sometimes makes it impossible to allocate
registers without these emergency spills.

llvm-svn: 119375

llvm-svn: 119374

llvm-svn: 119362

The system API's will be shifted over to returning an error_code, and returning
other return values as out parameters to the function.

Code that needs to check error conditions will use the errc enum values which
are the same as the posix_errno defines (EBADF, E2BIG, etc...), and are
compatable with the error codes in WinError.h due to some magic in system_error.

An example would be:

if (error_code ec = KillEvil("Java")) { // error_code can be converted to bool.
  handle_error(ec);
}

llvm-svn: 119360

llvm-svn: 119354

rather than calling hasConstantValue.  No intended functionality change.

llvm-svn: 119352

over a phi node by applying it to each operand may be wrong if the
operation and the phi node are mutually interdependent (the testcase
has a simple example of this).  So only do this transform if it would
be correct to perform the operation in each predecessor of the block
containing the phi, i.e. if the other operands all dominate the phi.
This should fix the FFMPEG snow.c regression reported by İsmail Dönmez.

llvm-svn: 119347

llvm-svn: 119328

llvm-svn: 119325

- Add encodings to the *LDMIA_RET instrs. Probably not needed...

llvm-svn: 119323

llvm-svn: 119321

(and likely) wrong about anyhow.

llvm-svn: 119320

branches to be emitted as:

 	bne cr0, 2
instead of:
 	bne cr0, $+8

llvm-svn: 119317

'db', 'ib', 'da') instead of having that mode as a separate field in the
instruction. It's more convenient for the asm parser and much more readable for
humans.
<rdar://problem/8654088>

llvm-svn: 119310

llvm-svn: 119309

llvm-svn: 119308

these instructions to be encoded with getMachineOpValue.
This unbreaks ExecutionEngine/2003-01-04-ArgumentBug.ll 
when running on a G5

llvm-svn: 119307

Use amazing new function call technology instead of writing identical code in
multiple places.

This fixes PR8604.

llvm-svn: 119306

The live range of a register defined by an early clobber starts at the use slot,
not the def slot.

Except when it is an early clobber tied to a use operand. Then it starts at the
def slot like a standard def.

llvm-svn: 119305

llvm-svn: 119295

llvm-svn: 119286

to be broken for other reasons

llvm-svn: 119283

This reverts r119183 which borke the buildbots.

llvm-svn: 119270

llvm-svn: 119187

iterator, not TII->OptimizeCompareInstr.

llvm-svn: 119186

llvm-svn: 119185

pass in the first place and was masked by earlier failures not warning
and aborting the block.

llvm-svn: 119184

The live range of a register defined by an early clobber starts at the use slot,
not the def slot.

llvm-svn: 119183

live ranges for the spill register are also defined at the use slot instead of
the normal def slot.

This fixes PR8612 for the inline spiller. A use was being allocated to the same
register as a spilled early clobber def.

This problem exists in all the spillers. A fix for the standard spiller is
forthcoming.

llvm-svn: 119182

llvm-svn: 119180

llvm-svn: 119176

llvm-svn: 119175

llvm-svn: 119170

llvm-svn: 119167

llvm-svn: 119164

values that are equal to the phi itself.

llvm-svn: 119161

variable if recursing fails to simplify it.

Factor AliasedSymbol to be a method of MCSymbol.

Update MCAssembler::EvaluateFixup to match the change in
EvaluateAsRelocatableImpl.

Remove the WeakRefExpr hack, as the object writer now sees the weakref with
no extra effort needed.

Nothing else is using MCTargetExpr, but keep it for now.

Now that the ELF writer sees relocations with aliases, handle

    .weak    foo2
foo2:
    .weak    bar2
    .set    bar2,foo2
    .quad    bar2

the same way gas does and produce a relocation with bar2.

llvm-svn: 119152

Added 2 new subclasses - X86ELFObjectWriter and ARMELFObectWriter.
ARM and X86 require different code for RecordRelocation(), possibly others.

llvm-svn: 119149

This moves most of the isUsed logic to the MCSymbol itself. With this we
get a bit more relaxed about allowing definitions after uses: uses that
don't evaluate their argument immediately (jmp foo) are accepted.

ddunbar, this was the smallest compromise I could think of that lets us
accept gcc (and clang!) assembly.

llvm-svn: 119144