teach libanalysis to simplify vector loads with bitcast sources.  This
implements something out of Target/README.txt producing:

_foo:                                                       ## @foo
movl 4(%esp), %eax
movapd LCPI1_0, %xmm0
movapd %xmm0, (%eax)
ret $4

instead of:

_foo:                                                       ## @foo
movl 4(%esp), %eax
movapd _b, %xmm0
mulpd LCPI1_0, %xmm0
addpd _a, %xmm0
movapd %xmm0, (%eax)
ret $4

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84942 91177308-0d34-0410-b5e6-96231b3b80d8

enhance FoldReinterpretLoadFromConstPtr to handle loads of up to 32
bytes (i256).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84941 91177308-0d34-0410-b5e6-96231b3b80d8

teach libanalysis to fold int and fp loads from almost arbitrary
non-type-safe constant initializers.  This sort of thing happens
quite a bit for 4-byte loads out of string constants, unions,
bitfields, and an interesting endianness check from sqlite, which
is something like this:

const int sqlite3one = 1;
# define SQLITE_BIGENDIAN    (*(char *)(&sqlite3one)==0)
# define SQLITE_LITTLEENDIAN (*(char *)(&sqlite3one)==1)
# define SQLITE_UTF16NATIVE (SQLITE_BIGENDIAN?SQLITE_UTF16BE:SQLITE_UTF16LE)

all of these macros now constant fold away.

This implements PR3152 and is based on a patch started by Eli, but heavily
modified and extended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84936 91177308-0d34-0410-b5e6-96231b3b80d8

Add 2.6 release note.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84934 91177308-0d34-0410-b5e6-96231b3b80d8

Update tests for 84931.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84932 91177308-0d34-0410-b5e6-96231b3b80d8

X86 needs critical path anti-dependency breaking.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84931 91177308-0d34-0410-b5e6-96231b3b80d8

Commit fixes for half precision I noted in review, so
they don't get lost; I don't think the originator has
write access.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84928 91177308-0d34-0410-b5e6-96231b3b80d8

This is passing on Darwin PPC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84921 91177308-0d34-0410-b5e6-96231b3b80d8

Minor code cleanup.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84919 91177308-0d34-0410-b5e6-96231b3b80d8

Neuter stack protectors by only checking character arrays. This is what GCC
does.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84916 91177308-0d34-0410-b5e6-96231b3b80d8

Allow the target to select the level of anti-dependence breaking that should be performed by the post-RA scheduler. The default is none.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84911 91177308-0d34-0410-b5e6-96231b3b80d8

Use 'waitpid' instead of 'wait'.  Basing Program::Wait() on 'wait()' prevents it being correct within a multithreaded context.

This address: PR 5277 (Program::Wait is unsafe to call from multiple threads).

Note: If waitpid() turns out to be non-portable, we can add more autoconf magic, or look into
another solution.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84903 91177308-0d34-0410-b5e6-96231b3b80d8

Try r84890 again (adding ValueMap<>), now that I've tested the compile on
gcc-4.4.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84902 91177308-0d34-0410-b5e6-96231b3b80d8

size_t, not unsigned here to silence a warning.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84900 91177308-0d34-0410-b5e6-96231b3b80d8

Random include cleanup.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84898 91177308-0d34-0410-b5e6-96231b3b80d8

Fix OProfileJITEventListener after r84054 renamed CompileUnit to Scope.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84895 91177308-0d34-0410-b5e6-96231b3b80d8

Tidying up some code and comments. No functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84894 91177308-0d34-0410-b5e6-96231b3b80d8

Revert r84890, which broke the linux build.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84892 91177308-0d34-0410-b5e6-96231b3b80d8

Add a ValueMap<ValueOrSubclass*, T> type.  ValueMap<Value*, T> is safe to use
even when keys get RAUWed and deleted during its lifetime. By default the keys
act like WeakVHs, but users can pass a third template parameter to configure
how updates work and whether to do anything beyond updating the map on each
action.

It's also possible to automatically acquire a lock around ValueMap updates
triggered by RAUWs and deletes, to support the ExecutionEngine.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84890 91177308-0d34-0410-b5e6-96231b3b80d8

Hide MetadataContext implementation details.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84886 91177308-0d34-0410-b5e6-96231b3b80d8

Fix getMDs() interface such that it does not expose implementation details.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84885 91177308-0d34-0410-b5e6-96231b3b80d8

Using TrackingVH instead of WeakVH or WeakMetadataVH.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84884 91177308-0d34-0410-b5e6-96231b3b80d8

Sort handler names to ensure deterministic behavior.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84878 91177308-0d34-0410-b5e6-96231b3b80d8

Trying again to tweak the top-level Makefile to facilitate an Apple-style build.
Now with Clang-compatibility.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84872 91177308-0d34-0410-b5e6-96231b3b80d8

Revert 84843.  Evan, this was breaking some of the if-conversion tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84868 91177308-0d34-0410-b5e6-96231b3b80d8

Include config.h in order to have HAVE_STDINT_H be defined.
In the latest binutils the plugin-api.h needs this - without
it the LLVM gold plugin fails to compile.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84861 91177308-0d34-0410-b5e6-96231b3b80d8

Verify that the function and exception table have been allocated
before freeing them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84859 91177308-0d34-0410-b5e6-96231b3b80d8

Check that accessing a struct field that occurs before the start
of the struct (!) works correctly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84853 91177308-0d34-0410-b5e6-96231b3b80d8

Test handling of record fields with negative offsets.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84851 91177308-0d34-0410-b5e6-96231b3b80d8

Shift art to the right to keep GCC from complaining about multi-line comments.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84849 91177308-0d34-0410-b5e6-96231b3b80d8

Move if-conversion before post-regalloc scheduling so the predicated instruction get scheduled properly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84843 91177308-0d34-0410-b5e6-96231b3b80d8

Load / store multiple was missing opportunites when the load / store bundles are at the end of the bb. Test case is already in, the bug is exposed by subsequent commit.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84842 91177308-0d34-0410-b5e6-96231b3b80d8

move another load optimization from instcombine -> libanalysis.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84841 91177308-0d34-0410-b5e6-96231b3b80d8

move 'loading i32 from string' optimization from instcombine
to libanalysis.  Instcombine shrinking... does this even
make sense???

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84840 91177308-0d34-0410-b5e6-96231b3b80d8

Move some constant folding logic for loads out of instcombine into
Analysis/ConstantFolding.cpp.  This doesn't change the behavior of
instcombine but makes other clients of ConstantFoldInstruction
able to handle loads.  This was partially extracted from Eli's patch
in PR3152.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84836 91177308-0d34-0410-b5e6-96231b3b80d8

Trim more includes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84832 91177308-0d34-0410-b5e6-96231b3b80d8

Trim include.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84831 91177308-0d34-0410-b5e6-96231b3b80d8

testcase for PR4678 & rdar://7309675

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84830 91177308-0d34-0410-b5e6-96231b3b80d8

Forgot a declaration.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84828 91177308-0d34-0410-b5e6-96231b3b80d8

Make 'unset_option' work on list options.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84827 91177308-0d34-0410-b5e6-96231b3b80d8

fix warning.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84826 91177308-0d34-0410-b5e6-96231b3b80d8

Fix getHandlerNames() interface. Now it populate clinet supplied small vector with handler names.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84820 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-ld doesn't throw.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84819 91177308-0d34-0410-b5e6-96231b3b80d8

this doesn't use EH either.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84818 91177308-0d34-0410-b5e6-96231b3b80d8

nothing opt uses can throw, remove the try block and -fexceptions when
building opt.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84816 91177308-0d34-0410-b5e6-96231b3b80d8

Add some command line options for twiddling the default data layout
used by opt when a module doesn't specify one.  Patch from Kenneth Uildriks!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84814 91177308-0d34-0410-b5e6-96231b3b80d8

Don't generate sbfx / ubfx with negative lsb field. Patch by David Conrad.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84813 91177308-0d34-0410-b5e6-96231b3b80d8

Use StringRef to construct MDString.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84811 91177308-0d34-0410-b5e6-96231b3b80d8

fix PR5262.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84810 91177308-0d34-0410-b5e6-96231b3b80d8

Use special DAG-to-DAG preprocessing to allow mem-mem instructions to be selected.
Yay for ASCII graphics!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84808 91177308-0d34-0410-b5e6-96231b3b80d8

Fix null pointer dereference.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84806 91177308-0d34-0410-b5e6-96231b3b80d8

Remove meaningless const.
Pass StringRef by value.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84804 91177308-0d34-0410-b5e6-96231b3b80d8

Revert the main portion of r31856. It was causing BranchFolding
to break up CFG diamonds by banishing one of the blocks to the end of
the function, which is bad for code density and branch size.

This does pessimize MultiSource/Benchmarks/Ptrdist/yacr2, the
benchmark cited as the reason for the change, however I've examined
the code and it looks more like a case of gaming a particular
branch than of being generally applicable.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84803 91177308-0d34-0410-b5e6-96231b3b80d8

Derive metadata hierarchy from Value instead of User.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84801 91177308-0d34-0410-b5e6-96231b3b80d8

revert r84754, it isn't the right approach.  Edwin, please propose
patches for fixes like this instead of committing them directly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84799 91177308-0d34-0410-b5e6-96231b3b80d8

Missing piece of the ARM frame index post-scavenging conditionalization

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84798 91177308-0d34-0410-b5e6-96231b3b80d8

Fix thinko noticed by Chris.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84797 91177308-0d34-0410-b5e6-96231b3b80d8

Adjust testcases for msasm -> alignstack.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84796 91177308-0d34-0410-b5e6-96231b3b80d8

Rename msasm to alignstack per review.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84795 91177308-0d34-0410-b5e6-96231b3b80d8

Remove pointless return; at end of function.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84794 91177308-0d34-0410-b5e6-96231b3b80d8

The spill restore needs to be resolved to the SP/FP just like the spill

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84792 91177308-0d34-0410-b5e6-96231b3b80d8

Conditionalize ARM/T2 frame index post-scavenging while working out fixes
for a few bugs.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84791 91177308-0d34-0410-b5e6-96231b3b80d8

Simplify code. No intended functionality change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84790 91177308-0d34-0410-b5e6-96231b3b80d8

Use StringRef.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84786 91177308-0d34-0410-b5e6-96231b3b80d8

Most of the NEON shuffle instructions do not support 64-bit element types.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84785 91177308-0d34-0410-b5e6-96231b3b80d8

Do not use SmallVector to store MDNode elements.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84784 91177308-0d34-0410-b5e6-96231b3b80d8

Revert r84764, it breaks mingw build

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84783 91177308-0d34-0410-b5e6-96231b3b80d8

XFAIL this test for PPC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84782 91177308-0d34-0410-b5e6-96231b3b80d8

Improve handling of immediates by splitting 32-bit immediates into two 16-bit
immediate operands when they will fit into the using instruction.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84778 91177308-0d34-0410-b5e6-96231b3b80d8

Add DAG printing for RMW stuff debugging

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84776 91177308-0d34-0410-b5e6-96231b3b80d8

RMW preprocessing stuff was incorrect. Grab the stuff from x86 backend and disable some tests until it will be clever enough to handle them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84775 91177308-0d34-0410-b5e6-96231b3b80d8

Implement branch folding

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84774 91177308-0d34-0410-b5e6-96231b3b80d8

Cosmetic changes, no functionality changes

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84773 91177308-0d34-0410-b5e6-96231b3b80d8

Make changes to rev 84292 as requested by Chris Lattner.

Most changes are cleanup, but there is 1 correctness fix:
I fixed InstCombine so that the icmp is removed only if the malloc call is removed (which requires explicit removal because the Worklist won't DCE any calls since they can have side-effects).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84772 91177308-0d34-0410-b5e6-96231b3b80d8

Fix NEON VST2LN instruction encoding.
Patch by Johnny Chen.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84767 91177308-0d34-0410-b5e6-96231b3b80d8

Revert 84732.  It was the wrong fix.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84766 91177308-0d34-0410-b5e6-96231b3b80d8

Incorporate various suggestions Chris gave during metadata review.

- i < getNumElements()  instead of getNumElements() > i
- Make setParent() private
- Fix use of resizeOperands
- Reset HasMetadata bit after removing all metadata attached to an instruction
- Efficient use of iterators

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84765 91177308-0d34-0410-b5e6-96231b3b80d8

Build shared lib instead of an archive.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84764 91177308-0d34-0410-b5e6-96231b3b80d8

Cleanup of frame index scavenging. Better code flow and more accurately
handles T2 and ARM use cases.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84761 91177308-0d34-0410-b5e6-96231b3b80d8

Two corrections for docs/CMake.html.

Patch by Victor Zverovich!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84759 91177308-0d34-0410-b5e6-96231b3b80d8

Fix PR5262: when folding select into PHI, make sure all operands are available
in the PHI's Basic Block. This uses a conservative approach, because we don't
have dominator info in instcombine.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84754 91177308-0d34-0410-b5e6-96231b3b80d8

Add a pass to overlay pic16 data sections for function frame and automatic
variables. This pass can be invoked by llvm-ld or opt to traverse over the call graph
to detect what function frames and their automatic variables can be overlaid.
Currently this builds an archive , but needs to be changed to a loadable module.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84753 91177308-0d34-0410-b5e6-96231b3b80d8

Added more options to mcc16 driver.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84752 91177308-0d34-0410-b5e6-96231b3b80d8

Match more patterns to movt.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84751 91177308-0d34-0410-b5e6-96231b3b80d8

Need a comma after imp-use.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84749 91177308-0d34-0410-b5e6-96231b3b80d8

De-bork CMake build

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84744 91177308-0d34-0410-b5e6-96231b3b80d8

Set comment string, patch by Johnny Chen!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84743 91177308-0d34-0410-b5e6-96231b3b80d8

make GVN work better when TD is not around:

"In the existing code, if the load and the value to replace it with are
of different types *and* target data is available, it tries to use the
target data to coerce the replacement value to the type of the load.
Otherwise, it skips all effort to handle the type mismatch and just
feeds the wrongly-typed replacement value to replaceAllUsesWith, which
triggers an assertion.

The patch replaces it with an outer if checking for type mismatch, and
an inner if-else that checks whether target data is available and, if
not, returns false rather than trying to replace the load."

Patch by Kenneth Uildriks!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84739 91177308-0d34-0410-b5e6-96231b3b80d8

tidy

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84738 91177308-0d34-0410-b5e6-96231b3b80d8

Fix some more NEON instruction encoding problems.
Thanks to Johnny Chen for discovering the problem.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84732 91177308-0d34-0410-b5e6-96231b3b80d8

Do not remove dead metadata for now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84731 91177308-0d34-0410-b5e6-96231b3b80d8

Leave some NEON instruction encoding bits unspecified instead of setting
a default value of zero.  This is important for decoding the instructions.
Patch by Johnny Chen, with some changes from me, too.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84730 91177308-0d34-0410-b5e6-96231b3b80d8

Clarify documentation on multi_val options.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84729 91177308-0d34-0410-b5e6-96231b3b80d8

Implement any_[not_]empty and list versions of switch_on and [not_]empty.

Useful for OptionPreprocessor.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84728 91177308-0d34-0410-b5e6-96231b3b80d8

Revert r84658 and r84691. They were causing llvm-gcc bootstrap to fail.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84727 91177308-0d34-0410-b5e6-96231b3b80d8

IPSCCP is missing stuff.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84725 91177308-0d34-0410-b5e6-96231b3b80d8

This is passing on Darwin PPC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84723 91177308-0d34-0410-b5e6-96231b3b80d8

Delete the MacOSJITEventListener per echristo's request. It was disabled by
default and didn't work anyway.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84720 91177308-0d34-0410-b5e6-96231b3b80d8

Add note

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84713 91177308-0d34-0410-b5e6-96231b3b80d8

Be crazy and assert in case of unsupported modifier passed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@84712 91177308-0d34-0410-b5e6-96231b3b80d8