… copies

The ARM backend can use a loop to implement copying byval parameters before
a call. In non-thumb2 mode it uses a constant pool load to materialize the
trip count. Since constpools go into rodata in NaCl instead of text, they
can sometimes be placed too far away to reach with a load instruction.
Instead, use movw/movt as in thumb mode to materialize the trip count.

R=jfb@chromium.org
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4115

Review URL: https://codereview.chromium.org/1019483003

The goal is to replace nacl tests' use of a hand-crafted filecheck
tool, with LLVM's FileCheck. To do so, we need to first ensure
FileCheck is copied to the install directory.

To that end, this CL introduces a build flag, LLVM_INSTALL_UTILS.

A separate CL enables this switch in toolchain_build_pnacl.py, see https://codereview.chromium.org/1018123002/

BUG=NONE
R=dschuff@chromium.org

Review URL: https://codereview.chromium.org/1019043002

This only adds support for the arch/OS and doesn't allow anything else in LLVM
for now. There's a corresponding clang patch to allow IR generation.

clang patch:
  https://codereview.chromium.org/1022123003

R=jvoung@chromium.org, azakai@mozilla.com, sunfish@mozilla.com
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4102
TEST= make check-all

Review URL: https://codereview.chromium.org/1024073002

The new phase, NormalizeStructRegSignatures, converts signatures having parameters, or returning struct registers; or using structs that transitively reference such function types.

The phase relies on a subsequent phase to clean up the redundant alloca/load/store instructions, however, I'm still investigating which such phase should be.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=3857
R=dschuff@chromium.org, jfb@chromium.org, mseaborn@chromium.org

Review URL: https://codereview.chromium.org/992493002

Globals marked as "used" (e.g. __attribute((used))__) are correctly
ignored by the internalize pass. PNaCl ABI compliance requires all
globals be marked internal. In such scenarios - whole, single program -
marking all globals as internal would be correct. The new pass does so.

4049: globals marked as "used" & pnacl abi compliance

Using IRBuilder

patch from issue 992493002 at patchset 140001 (http://crrev.com/992493002#ps140001)

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4049
R=jfb@chromium.org

Review URL: https://codereview.chromium.org/1015553002

Changes the API to function NaClObjDump to expect a MemoryBufferRef
instead of a MemoryBuffer*, to be consistent with other functions
in NaClReaderWriter.h

Also cleans up class NaClBitcodeMunge.cpp to reuse the low-level
implementation of the memory buffer. This was done after discovering
that getMemBufferCopy allocates (and leaks) an internal low-level
implementation of the memory buffer. The code now reuses a single
buffer over all tests for that class, stopping the leak to memory.

BUG= https://code.google.com/p/nativeclient/issues/detail?id=4103
R=dschuff@chromium.org, jvoung@chromium.org

Review URL: https://codereview.chromium.org/1013823002

The previous version of pnacl-bccompress never removed abbreviations
as new abbreviations were added. This resulted in many unused
abbreviations being left in the compressed file. This has two costs.
The first is that the unnecessary abbreviation is saved to the
file. The other is that it may cause the bitcode to use more bits for
each abbreviation, increasing the size of each record.

This CL removes such abbreviations by adding another bitcode scan to
find the best abbreviation to use for each record, and then remove
unused abbreviations before writing out the compressed bitcode file.

This change (for large bitcode files) results in
pnacl-compress running about a 10% slower and
produces a bitcode file that is about 1.2% smaller.

BUG=None
R=jvoung@chromium.org

Review URL: https://codereview.chromium.org/1003303002

LLVM was generating register-register loads on ARM (rejected by the sandbox)
when doing bswap16 because the pattern that combines the load wasn't predicated
on NaCl. This patch adds this predication so that NaCl doesn't generate that
pattern.

The LLVM pattern was added in the following patch:
  https://llvm.org/svn/llvm-project/llvm/trunk@208620

BUG= https://code.google.com/p/chromium/issues/detail?id=460432
R=jvoung@chromium.org
TEST= make check

Review URL: https://codereview.chromium.org/1008233005

@llvm.assume calls can safely be removed.

R=jfb@chromium.org
TEST= (make -C toolchain_build/out/llvm_x86_64_linux_work -j `nproc` check)
BUG=

Review URL: https://codereview.chromium.org/1029273002

R=jfb@chromium.org
TEST= (make -C toolchain_build/out/llvm_x86_64_linux_work -j `nproc` check)
BUG=

Review URL: https://codereview.chromium.org/1042643002

…sume intrinsics

See:
  7216560
  daf116d
  59962e9

R=dschuff@chromium.org, azakai@mozilla.com
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4102
TEST= make check

Review URL: https://codereview.chromium.org/1042043002

We upstreamed our Triple localmod for ARM in r233321. Remove the LOCALMODs
and update to the upstream version.

R=jvoung@chromium.org
BUG=None

Review URL: https://codereview.chromium.org/1048993002

Emscripten relies on llvm.used to figure out what's exported:
  91288b6#diff-a7c3065843b374b0a91b623f66f6eb0a

This patch also fixes the initialization of the globalcleanup.ll test: llvm.used
can't use zeroinitializer (see test/Verifier/llvm.used-invalid-init.ll).

R=dschuff@chromium.org, azakai@mozilla.com
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4102
TEST= make check

Review URL: https://codereview.chromium.org/1048983003

Post-opt passes were running dead inst elimination as well as dead code
elimination, which is strictly superior to dead inst elimination.

R=dschuff@chromium.org
BUG= none
TEST= make check

Review URL: https://codereview.chromium.org/1045043003

TCrets use a reduced subset of registers because they cannot use
callee-saves. When using sandbox base hiding (with r11 reserved) there are not
enough registers because all of the available registers are used for arguments.

R=jvoung@chromium.org
BUG= https://code.google.com/p/nativeclient/issues/detail?id=4123

Review URL: https://codereview.chromium.org/1040233005

Conflicts:
	include/llvm/ADT/Triple.h
	lib/Transforms/NaCl/ExpandVarArgs.cpp
	lib/Transforms/NaCl/GlobalCleanup.cpp
	lib/Transforms/NaCl/PNaClABISimplify.cpp