in SSAUpdaterImpl.h

Verifying live intervals revealed that the old method was completely wrong, and
we need an iterative approach to calculating PHI placemant. Fortunately, we have
MachineDominators available, so we don't have to compute that over and over
like SSAUpdaterImpl.h must.

Live-out values are cached between calls to mapValue() and computed in a greedy
way, so most calls will be working with very small block sets.

Thanks to Bob for explaining how this should work.

llvm-svn: 117599

proper SSA updating.

This doesn't cause MachineDominators to be recomputed since we are already
requiring MachineLoopInfo which uses dominators as well.

llvm-svn: 117598

split.

llvm-svn: 117597

which contains slashes is inconsistent with the meaning of PATH on
Unix-type platforms, and pretty surprising.

If the user has given a specific path to execute and we can't
execute it, we should fail and say why.  (Apparently the new
posix_spawn code doesn't always say why, but that's a separate
issue.)

llvm-svn: 117596

llvm-svn: 117595

llvm-svn: 117592

llvm-svn: 117588

llvm-svn: 117586

llvm-svn: 117585

llvm-svn: 117584

llvm-svn: 117583

Original commit message:

    On "Unix", if Program::FindProgramByName is given a name containing
    slashes, just go with it, regardless of whether it looks like it will
    be executable. This follows the behavior of sh(1) more closely.

It's better when behaviour is consistent between platforms. This change also
makes FindExecutable() behave as expected on unix-likes (before this commit, it
used to always succeed).

llvm-svn: 117582

llvm-svn: 117581

llvm-svn: 117580

llvm-svn: 117577

llvm-svn: 117575

llvm-svn: 117572

llvm-svn: 117571

Move the existing patching for undefined symbols so that all the patching
is done in the same function.

llvm-svn: 117570

llvm-svn: 117563

llvm-svn: 117560

llvm-svn: 117559

Also do some minor refactoring to reduce indentation.

llvm-svn: 117558

Pointed out by Chris!

llvm-svn: 117557

llvm-svn: 117553

llvm-svn: 117552

a null pointer.

llvm-svn: 117551

llvm-svn: 117548

llvm-svn: 117547

llvm-svn: 117546

UnitTests for building all the unit tests.

llvm-svn: 117545

llvm-svn: 117544

llvm-svn: 117543

llvm-svn: 117538

llvm-svn: 117531

I'll work with Jim, Owen, and Bill on an alternative testing strategy until
the assembly parser is available.

llvm-svn: 117530

test/Transforms/SimplifyLibCalls/floor.ll: Mark as XFAIL:win32 due to lack of nearbyintf on MSVC. [PR8466]

llvm-svn: 117529

Thanks to Yuri Gribov and Vladimir Kirillov!
*BSD(s) have environ(7) in CRT startup and cannot resolve "environ" at linking llvm.so.
environ(7) is used inlib/System/Unix/Program.inc.

llvm-svn: 117528

doesn't mean that you can't get a .o file.  Apparently
this is confusing :)

llvm-svn: 117523

llvm-svn: 117520