Scan the MachineFunction for DBG_VALUE instructions, and replace them with a
data structure similar to LiveIntervals. The live range of a DBG_VALUE is
determined by propagating it down the dominator tree until a new DBG_VALUE is
found. When a DBG_VALUE lives in a register, its live range is confined to the
live range of the register's value.

LiveDebugVariables runs before coalescing, so DBG_VALUEs are not artificially
extended when registers are joined.

The missing half will recreate DBG_VALUE instructions from the intervals when
register allocation is complete.

The pass is disabled by default. It can be enabled with the temporary command
line option -live-debug-variables.

llvm-svn: 120636

pool entries (LEApcrel pseudo). Ongoing saga of rdar://8542291.

llvm-svn: 120635

llvm-svn: 120632

llvm-svn: 120631

llvm-svn: 120630

llvm-svn: 120622

llvm-svn: 120621

llvm-svn: 120619

llvm-svn: 120616

encoding if we're in that mode.

llvm-svn: 120608

llvm-svn: 120604

by the assembler. This was blocking parsing any large .s produced by clang for
example.

Fixes PR8596.

llvm-svn: 120603

instead of toStringRef. The file system APIs need c strings.

llvm-svn: 120601

llvm-svn: 120600

This avoids warnings with -Wvector-conversions.  Radar 8228022.

llvm-svn: 120597

llvm-svn: 120596

llvm-svn: 120595

instruction at MC lowering. Add binary encoding information for the ADR,
including fixup data for the label operand.

llvm-svn: 120594

file creation APIs aren't implemented.

llvm-svn: 120593

llvm-svn: 120592

llvm-svn: 120590

Add correct encodings for STRD and LDRD, including fixup support.  Additionally, update these to unified syntax.

llvm-svn: 120589

llvm-svn: 120586

llvm-svn: 120585

llvm-svn: 120584

llvm-svn: 120580

llvm-svn: 120575

The user (i.e. whoever generated a call to the intrinsic in the first place) is
essentially asking for a particular instruction to be placed in the assembler.
If that instruction won't execute on the target machine, that's their problem
not ours.  Two buildbots with processors that don't support SSE3 were barfing
on the apm.ll test in CodeGen/X86 because of this assertion.

llvm-svn: 120574

llvm-svn: 120571

setAllBits(), setBit(unsigned), etc.

llvm-svn: 120564

llvm-svn: 120560

Support/PathV2: Add has_{root_path,root_name,root_directory,parent_path,filename,stem,extension} implementation.

llvm-svn: 120559

I'm going to replace this all anyway with a proper table and separated tests
when done.

llvm-svn: 120558

llvm-svn: 120552

llvm-svn: 120551

llvm-svn: 120550

llvm-svn: 120549

llvm-svn: 120547

llvm-svn: 120546

variable unsigned.

llvm-svn: 120541