Instead of doing a RPO traversal of the whole function remember the blocks
containing gathers (typically <= 2) and scan them in dominator-first order.

The actual CSE is still quadratic, but I'm not confident that adding a
scoped hash table here is worth it as we're only looking at the generated
instructions and not arbitrary code.

llvm-svn: 193956

This reverts commit r193356, it caused PR17781.

A reduced test case covering this regression has been added to the test suite.

llvm-svn: 193955

llvm-svn: 193954

llvm-svn: 193953

OCaml's type unit is not compatible with C's type void.

llvm-svn: 193952

llvm-svn: 193951

llvm-svn: 193950

Llvm_target tests did not check for return values. This actually
caused them to miss a bug.

llvm-svn: 193949

llvm-svn: 193948

llvm-svn: 193947

llvm-svn: 193946

llvm-svn: 193945

This adds an SimplifyLibCalls case which converts the special __sinpi and
__cospi (float & double variants) into a __sincospi_stret where appropriate to
remove duplicated work.

Patch by Tim Northover

llvm-svn: 193943

rdar://12856873
Patch by Evan Cheng, with a fix for rdar://13209539 by Tilmann Scheller

llvm-svn: 193942

llvm-svn: 193941

Patch by Pete Cooper.

llvm-svn: 193940

llvm-svn: 193939

When LLVM is embedded in a larger application, it's not OK for LLVM to intercept crashes.  LLVM already has 
the ability to disable this functionality.  This patch exposes it via the C API.

llvm-svn: 193937

llvm-svn: 193933

llvm-svn: 193932

This is a fixed version of 193928 which keeps these uses in sync.

llvm-svn: 193931

Investigating a bot failure.

This reverts commit r193928.

llvm-svn: 193929

llvm-svn: 193928

llvm-svn: 193927

Doing this with a hash map doesn't change behavior and avoids calling
isIdenticalTo O(n^2) times. This should probably eventually move into a utility
class shared with EarlyCSE and the limited CSE in the SLPVectorizer.

llvm-svn: 193926

llvm-svn: 193915

llvm-svn: 193914

There is still a long way to go for llvm-nm, but at least we now match
nm's letter output in the cases we test for.

llvm-svn: 193912

- When selecting BLEND from vselect, the operands need swapping as due to the
  difference between vselect and SSE/AVX's BLEND insn

llvm-svn: 193900

Added -o option to llvm-cov. If no output file is specified, it defaults
to STDOUT.

llvm-svn: 193899

llvm-svn: 193895

llvm-svn: 193894

I hit some problems with future work due to the member subprogram of
'a_b's type having a subprogram (an implicit default ctor, !52 in the
pre-commit source) with no name. Clang now generates a name for such a
function but in this case doesn't even emit debug info for it as it is
unused (Clang never emits the body of the ctor, instead just emitting
memset if needed).

llvm-svn: 193892

When the loop vectorizer was part of the SCC inliner pass manager gvn would
run after the loop vectorizer followed by instcombine. This way redundancy
(multiple uses) were removed and instcombine could perform scalarization on the
induction variables. Having moved the loop vectorizer to later we no longer run
any form of redundancy elimination before we perform instcombine. This caused
vectorized induction variables to survive that did not before.

On a recent iMac this helps linpack back from 6000Mflops to 7000Mflops.

This should also help lpbench and paq8p.

I ran a Release (without Asserts) build over the test-suite and did not see any
negative impact on compile time.

radar://15339680

llvm-svn: 193891

The point is to ensure that the attribute in question
(DW_AT_data_member_location) is associated with the prior tag, so ensure
that we don't see another tag starting between the intended tag and the
desired attribute.

llvm-svn: 193884

llvm-svn: 193878

llvm-svn: 193876

llvm-svn: 193874

In a failed attempt to allow the gnu-public-names.ll test case to not
hardcode the size of the unit that the pubnames section referred to I've
at least managed to have unit headers and pubnames headers print out in
a similar style.

This failed to achieve the desired goal because the header in a unit
specifies the length of the unit without the length element of the
header whereas the length in the pubnames includes this element, so the
numbers are off by 4 bytes. I don't know of any arithmetic powers in
FileCheck so the test case can't simply say "CU_LENGTH + 4".

llvm-svn: 193872

llvm-svn: 193871