emit incomplete types, because they crash llc, and always use the 
logical location as the current location so we don't crash doing invalid 
queries on CurLoc.

llvm-svn: 51675

This change makes clang generate the same thing as llvm-gcc.

llvm-svn: 51674

nothing fundamentally wrong with it. Emitting unpacked structs where 
possible is more work for almost no practical benefit.  We'll probably 
want to fix it at some point anyway, but it's low priority.

The issue with long double in particular is that LLVM thinks an X86 long
double is 10 bytes, while clang considers it for all purposes to be
either 12 or 16 bytes, depending on the platform, even in a packed
struct.

llvm-svn: 51673

llvm-svn: 51672

Dhrystone introduced by its removal.

llvm-svn: 51669

the one case that ADCE catches that normal DCE doesn't: non-induction variable
loop computations.

This implementation handles this problem without using postdominators.

llvm-svn: 51668

llvm-svn: 51667

llvm-svn: 51666

llvm-svn: 51665

llvm-svn: 51664

llvm-svn: 51663

like.

llvm-svn: 51662

llvm-svn: 51661

instruction to execute. This can be used for transformations (like two-address
conversion) to remat an instruction instead of generating a "move"
instruction. The idea is to decrease the live ranges and register pressure and
all that jazz.

llvm-svn: 51660

that it's safe to remat an instruction.

llvm-svn: 51659

llvm-svn: 51658

Factor the numbering computation into a separate method, and add the slightest attempt at some renumbering logic, which is currently unused.

llvm-svn: 51652

from the rope.  rdar://5952468

llvm-svn: 51651

llvm-svn: 51648

llvm-svn: 51647

llvm-svn: 51646

llvm-svn: 51645

llvm-svn: 51644

their release.

llvm-svn: 51638

llvm-svn: 51636

llvm-svn: 51635

llvm-svn: 51634

on ia64.

llvm-svn: 51633

llvm-svn: 51632

llvm-svn: 51631

llvm-svn: 51630

is a memory location

llvm-svn: 51626

code generator would do something like this:

f64 = load f32 <anyext>, f32mem
v2f64 = insertelt undef, %0, 0
v2f64 = insertelt %1, 0.0, 1

into 

v2f64 = vzext_load f32mem

which on x86 is movsd, when you really wanted a cvtss2sd/movsd pair.

llvm-svn: 51624

llvm-svn: 51623

llvm-svn: 51622

When the build command is xcodebuild, set the magical environment variable LDPLUSPLUS to g++ to ensure that C++ object files are linked with g++ instead of gcc.

llvm-svn: 51621

llvm-svn: 51620

llvm-svn: 51619

llvm-svn: 51618

llvm-svn: 51617