Revert r215343.

This was contentious and needs invesigation.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218971 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Remove a couple of fairly pointless tests. These were merely
testing that we generated divps and divss but not in a very systematic
way. There are other tests for widening binary operations already that
make these unnecessary.

The second one seems mostly about testing Atom as well as normal X86,
but despite the comment claiming it is testing a different instruction
sequence, it then tests for exactly the same div instruction sequence!
(The sequence of instructions is actually quite different on Atom, but
not the sequence of div instructions....)

And then it has an "execution" test that simply isn't run? Very strange.
Anyways, none of this is really needed so clean this up.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218972 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Add two more triples to stabilize the precise assembly syntax
across platforms.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218973 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Unbreak SSE1 with the new vector shuffle lowering. We can't widen
element types to form illegal vector types.

I've added a special SSE1 test case here that makes sure we don't break
this going forward.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218974 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Add some important, missing test coverage for blending from one
vector to a zero vector for the v2 cases and fix the v4 integer cases to
actually blend from a vector.

There are already seprate tests for the case of inserting from a scalar.

These cases cover a lot of the regressions I've seen in the regression
test suite for the new vector shuffle lowering and specifically cover
the reported lack of using various zext-ing instruction patterns. My
next patch should fix a big chunk of this, but wanted to get a nice
baseline for these patterns in the test cases first.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218976 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Significantly improve the ability of the new vector shuffle
lowering to match VZEXT_MOVL patterns.

I hadn't realized that these had sufficient pattern smarts in the
backend to lower zext-ing from the low element of a vector without it
being a scalar_to_vector node. They do, and this is how to match a bunch
of patterns for movq, movss, etc.

There is a weird propensity to end up using pshufd to place the element
afterward even though it means domain crossing (or rather, to use
xorps+movss to zext the element rather than movq) but that's an
orthogonal problem with VZEXT_MOVL that someone should probably look at.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218977 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Fix the RUN-lines of this test to make sense.

I got them quite wrong when updating it and had the SSE4.1 run checked
for SSE2 and the SSE2 run checked for SSE4.1. I think everything was
actually generic SSE, but this still seems good to fix. While here,
hoist the triple into the IR and make the flag set a bit more direct in
what it is trying to test.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218978 91177308-0d34-0410-b5e6-96231b3b80d8
Fix typo in comment

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218979 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Refactor the element insertion logic in the new vector shuffle
lowering to handle the potential mirroring of 2-element vectors (because
we can't reliably sort them one way) in the caller rather than in the
insertion logic.

This will simplify things considerably as more ways to fail to match the
insertion are added because now we have a nice try and retry point.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218980 91177308-0d34-0410-b5e6-96231b3b80d8
Revert 202433 - Provide a target override for the latest regalloc heuristic

That commit was introduced in order to help investigate a problem in ARM
codegen breaking from commit 202304 (Add a limit to the heuristic that register
allocates instructions in local order). Recent analisys indicated that the
problem no longer exists, so I'm reverting this change.

See PR18996.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218981 91177308-0d34-0410-b5e6-96231b3b80d8
[sphinx cleanup] Fix unexpected indentation warning introduced by r218937

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218982 91177308-0d34-0410-b5e6-96231b3b80d8
[x86] Teach the new vector shuffle lowering to aggressively form MOVSS
and MOVSD nodes for single element vector inserts.

This is particularly important because a number of patterns in the
backend detect these patterns and leverage them to simplify things. It
also fixes quite a few of the insertion bad code examples. However, it
regresses a specific area: when available, blendps and blendpd are
*dramatically* faster than movss and movsd respectively. But it doesn't
really work to form the blend logic first because the blends *aren't* as
crazy efficient when the data is coming from memory anyways, and thus
will have a movss or movsd regardless. Also, doing that would block
a bunch of the patterns that this is designed to hit.

So my plan is to go into the patterns for lowering MOVSS and MOVSD and
lower them via blends when available. However that's a pretty invasive
restructuring so it will need to be a follow-up patch.

I have already gone into the patterns to lower MOVSS and MOVSD from
memory using MOVLPD, etc. Without that, several of the test cases
I already have regress.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218985 91177308-0d34-0410-b5e6-96231b3b80d8
Adding skeleton for unit testing Hexagon Code Emission

Adding and modifying CMakeLists.txt files to run unit tests under
unittests/Target/* if the directory exists.  Adding basic unit test to check
that code emitter object can be retrieved.

Differential Revision: http://reviews.llvm.org/D5523
Change by: Colin LeMahieu

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218986 91177308-0d34-0410-b5e6-96231b3b80d8
Fix build break on Hexagon

Differential Revision: http://reviews.llvm.org/D5600

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218987 91177308-0d34-0410-b5e6-96231b3b80d8
[mips] Print warning when using register names not available in N32/64

Summary:
The register names t4-t7 are not available in the N32 and N64 ABIs.
This patch prints a warning, when those names are used in N32/64,
along with a fix-it with the correct register names.

Patch by Vasileios Kalintiris

Reviewers: dsanders

Reviewed By: dsanders

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5272


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218989 91177308-0d34-0410-b5e6-96231b3b80d8
HexagonMCCodeEmitter.h: deleted member functions are not supported in VS2012

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218990 91177308-0d34-0410-b5e6-96231b3b80d8
MipsAsmParser.cpp: fix VS2012 build

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218991 91177308-0d34-0410-b5e6-96231b3b80d8
[Power] Use lwsync for non-seq_cst fences

Summary:
hwsync is only required for seq_cst fences, acquire and release one can use
the cheaper lwsync.

Test Plan: Added some cases to atomics.ll + make check-all

Reviewers: jfb, wschmidt

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D5317

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218995 91177308-0d34-0410-b5e6-96231b3b80d8
llvm-readobj: print out the fields of the COFF delay-import table


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218996 91177308-0d34-0410-b5e6-96231b3b80d8
[Power] Delete redundant test Atomics-32.ll

The test Atomics-32.ll was both redundant (all operations are also checked by
atomics.ll at least) and not actually checking correctness (it was not using
FileCheck, just verifying that the compiler does not crash).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@218997 91177308-0d34-0410-b5e6-96231b3b80d8