llvm-svn: 151795

* Add begin_dynamic_table() / end_dynamic_table() private interface to ELFObjectFile.
* Add begin_libraries_needed() / end_libraries_needed() interface to ObjectFile, for grabbing the list of needed libraries for a shared object or dynamic executable.
* Implement this new interface completely for ELF, leave stubs for COFF and MachO.
* Add 'llvm-readobj' tool for dumping ObjectFile information.

llvm-svn: 151785

While we're at it - don't copy vreg implicit operands while rematerializing.
This fixes PR12138.

llvm-svn: 151779

llvm-svn: 151778

LegalizeIntegerTypes: Reorder operations in the "big shift by small amount" optimization, making the lives of later passes easier.

llvm-svn: 151722

a constant.  This fixes PR1768.

llvm-svn: 151713

llvm-svn: 151694

Without this hook, functions w/ a completely empty body (including no
epilogue) will cause an MCEmitter assertion failure.

For example,
define internal fastcc void @empty_function() {
  unreachable
}

rdar://10947471

llvm-svn: 151673

In the ObjectFile interface, replace isInternal(), isAbsolute(), isGlobal(), and isWeak(), with a bitset of flags.

llvm-svn: 151670

debug info for assembly files. We were already doing the right thing when
producing debug info for C/C++.

ELF linkers don't know dwarf, so they depend on these relocations to produce
valid dwarf output.

llvm-svn: 151655

To avoid problems with zero shifts when getting the bits that move between words
we use a trick: first shift the by amount-1, then do another shift by one. When
amount is 0 (and size 32) we first shift by 31, then by one, instead of by 32.

Also fix a latent bug that emitted the low and high words in the wrong order
when shifting right.

Fixes PR12113.

llvm-svn: 151637

Revert r151623 "Some ARM implementaions, e.g. A-series, does return stack prediction. ...", it is breaking the Clang build during the Compiler-RT part.

llvm-svn: 151630

When the GEP index is a vector of pointers, the code that calculated the size
of the element started from the vector type, and not the contained pointer type.
As a result, instead of looking at the data element pointed by the vector, this
code used the size of the vector. This works for 32bit members (on 32bit
systems), but not for other types. Added code to peel the vector type and
added a test.

llvm-svn: 151626

the processor keeps a return addresses stack (RAS) which stores the address
and the instruction execution state of the instruction after a function-call
type branch instruction.

Calling a "noreturn" function with normal call instructions (e.g. bl) can
corrupt RAS and causes 100% return misprediction so LLVM should use a
unconditional branch instead. i.e.
mov lr, pc
b _foo
The "mov lr, pc" is issued in order to get proper backtrace.

rdar://8979299

llvm-svn: 151623

Reverted r152620 - DSE: Shorten memset when a later store overwrites the start of it.  There were all sorts of buildbot issues

llvm-svn: 151621

llvm-svn: 151620

load and store instructions.

llvm-svn: 151611

Don't attempt to extend physreg live ranges across calls.

<rdar://problem/10942095>

llvm-svn: 151610

When an outgoing call takes more than 2k of arguments on the stack, we
don't allocate that call frame in the prolog, but adjust the stack
pointer immediately before the call instead.

This causes problems with the emergency spill slot because PEI can't
track stack pointer adjustments on the second pass, and if the outgoing
arguments are too big, SP can't be used to reach the emergency spill
slot at all.

Work around these problems by ensuring there is a base or frame pointer
that can be used to access the emergency spill slot.

<rdar://problem/10917166>

llvm-svn: 151604

Add -D option to llvm-nm to dump dynamic symbols.

Patch by David Meyer.

llvm-svn: 151600

llvm-svn: 151594

llvm-svn: 151588

Duncan pointed out that if the alignment isn't explicitly specified, it defaults to the ABI alignment.  Given that, make this code a bit more aggressive in such cases.

llvm-svn: 151584

llvm-svn: 151578

We on the linker to resolve calls to the appropriate BL/BLX instruction
to make interworking function correctly. It uses the symbol in the
relocation to do that, so we need to be careful about being too clever.

To enable this for ARM mode, split the BL/BLX fixup kind off from the
unconditional-branch fixups.

rdar://10927209

llvm-svn: 151571

Teach BasicAA about the LLVM IR rules that allow reading past the end of an object given sufficient alignment.  Fixes PR12098.

llvm-svn: 151553

llvm-svn: 151552

MCize function entry label emission on PowerPC64 properly.

llvm-svn: 151547

%cmp (eg: A==B) we already replace %cmp with "true" under the true edge, and
with "false" under the false edge.  This change enhances this to replace the
negated compare (A!=B) with "false" under the true edge and "true" under the
false edge.  Reported to improve perlbench results by 1%.

llvm-svn: 151517

properties (invoke). Just assert that the instruction we return dominates
the insertion point.

llvm-svn: 151511

llvm-svn: 151510

llvm-svn: 151475

verifier does. This correctly handles invoke.
Thanks to Duncan, Andrew and Chris for the comments.
Thanks to Joerg for the early testing.

llvm-svn: 151469

'gep null' when the icmp predicate is unsigned (or is signed without inbounds).

llvm-svn: 151467

MultiSource/Applications/lua.

llvm-svn: 151463

equal if both are null. In the test, scope type %t and global @y by adding a
'gep' prefix to them.

llvm-svn: 151452

by using llvm::isIdentifiedObject. Also teach it to handle GEPs that have
the same base pointer and constant operands. Fixes PR11238!

llvm-svn: 151449

Reverting this because it breaks static linking on ppc64. Specifically, it may be linkonce_odr functions that are the problem.
With this patch, if you link statically, calls to some functions end up calling their descriptor addresses instead
of calling to their entry points. This causes the execution to fail with SIGILL (b/c the descriptor address just
has some pointers, not code).

llvm-svn: 151433

Target/X86: Fix assertion failures and warnings caused by r151382 _ftol2 lowering for i386-*-win32 targets. Patch by Joe Groff.

[Joe Groff] Hi everyone. My previous patch applied as r151382 had a few problems:
Clang raised a warning, and X86 LowerOperation would assert out for
fptoui f64 to i32 because it improperly lowered to an illegal
BUILD_PAIR. Here's a patch that addresses these issues. Let me know if
any other changes are necessary. Thanks.

llvm-svn: 151432

add/sub instructions.

llvm-svn: 151415