gcc exception handling: if an exception unwinds through
an invoke, then execution must branch to the invoke's
unwind target.  We previously tried to enforce this by
appending a cleanup action to every selector, however
this does not always work correctly due to an optimization
in the C++ unwinding runtime: if only cleanups would be
run while unwinding an exception, then the program just
terminates without actually executing the cleanups, as
invoke semantics would require.  I was hoping this
wouldn't be a problem, but in fact it turns out to be the
cause of all the remaining failures in the LLVM testsuite
(these also fail with -enable-correct-eh-support, so turning
on -enable-eh didn't make things worse!).  Instead we need
to append a full-blown catch-all to the end of each
selector.  The correct way of doing this depends on the
personality function, i.e. it is language dependent, so
can only be done by gcc.  Thus this patch which generalizes
the eh.selector intrinsic so that it can handle all possible
kinds of action table entries (before it didn't accomodate
cleanups): now 0 indicates a cleanup, and filters have to be
specified using the number of type infos plus one rather than
the number of type infos.  Related gcc patches will cause
Ada to pass a cleanup (0) to force the selector to always
fire, while C++ will use a C++ catch-all (null).

llvm-svn: 41484

llvm-svn: 41482

Coping 100MB array (after a warmup) shows that glibc 2.6.1 implementation on
x86-64 (core 2) is 30% faster (from 0.270917s to 0.188079s)

llvm-svn: 41479

Don't promote volatile loads/stores. This is needed (for example) to handle setjmp/longjmp properly.
This fixes PR1520.

llvm-svn: 41461

llvm-svn: 41456

llvm-svn: 41409

over uses in DAGCombiner.  Fix interfaces to work
with APFloats.

llvm-svn: 41407

Move exit condition and exit branch from exiting block into loop header and dominator info. This avoid execution of dead iteration. Loop is already filter in the beginning such that this change is safe.

llvm-svn: 41394

llvm-svn: 41389

know how to handle them.  This fixes 
test/CodeGen/Generic/asm-large-immediate.ll

llvm-svn: 41388

While calculating upper loop bound for first loop and lower loop bound for second loop, take care of edge cases.

llvm-svn: 41387

llvm-svn: 41386

    .set  Lset0,___gxx_personality_v0-.
    .long Lset0

on some targets. Make it so!

llvm-svn: 41385

changing the interface to allow for future changes.

llvm-svn: 41384

This means backing out the preceding change to Constants.cpp, alas.

llvm-svn: 41378

llvm-svn: 41372

This eliminates a conditional on that path, and ensures ICmpInst/FCmpInst
both have an out-of-line virtual method to home the class.

llvm-svn: 41371

Fix regression that I caused yesterday night while adding logic to select appropriate split condition branch.

llvm-svn: 41365

llvm-svn: 41360

llvm-svn: 41359

condition predicate is GT or GE then execute false branch first.

llvm-svn: 41358

llvm-svn: 41357

llvm-svn: 41356

llvm-svn: 41354

llvm-svn: 41353

llvm-svn: 41352

Interface to rest of the compiler unchanged, as yet.

llvm-svn: 41348

llvm-svn: 41319

llvm-svn: 41318

llvm-svn: 41316

Add an APSInt::toString() method.

llvm-svn: 41309

llvm-svn: 41295

llvm-svn: 41292

"True Loop" and "False Loop" naming terminology to refer two loops
after loop cloning is confusing. Instead just use A_Loop and B_Loop.

llvm-svn: 41287

llvm-svn: 41286

llvm-svn: 41284

llvm-svn: 41282

Starting value of second loop's induction variable can not be lower 
then starting value of original loop's induction variable.

llvm-svn: 41280

llvm-svn: 41250

llvm-svn: 41246