llvm-svn: 145027

llvm-svn: 145026

llvm-svn: 145025

Make LowerSIGN_EXTEND_INREG split 256-bit vectors when AVX1 is enabled and use AVX2 shifts when AVX2 is enabled.

llvm-svn: 145022

llvm-svn: 145021

llvm-svn: 145020

generate any reasonable depfile if a header is missing.

llvm-svn: 145019

output files that are valid regardless of whether the compilation
succeeded or failed (but not if we crash).  Add depfiles to the
failure result file list.

llvm-svn: 145018

This saves us from re-creating the symlink on every build even if we
didn't rebuild clang.

llvm-svn: 145017

Fixes PR4777.

llvm-svn: 145015

llvm-svn: 145014

Suggested in code review by Eli.

That code in InstCombine looks kinda suspicious.

llvm-svn: 145013

from Jason Haslam!

llvm-svn: 145012

llvm-svn: 145011

properly account for the *global* probability of the edge being taken.
This manifested as a very large number of unconditional branches to
blocks being merged against the CFG even though they weren't
particularly hot within the CFG.

The fix is to check whether the edge being merged is both locally hot
relative to other successors for the source block, and globally hot
compared to other (unmerged) predecessors of the destination block.

This introduces a new crasher on GCC single-source, but it's currently
behind a flag, and Ben has offered to work on the reduction. =]

llvm-svn: 145010

llvm-svn: 145009

llvm-svn: 145008

setFlags doesn't modify its arguments.

llvm-svn: 145007

is actually being tested. Also add some FileCheck goodness to much more
carefully ensure that the result is the desired result. Before this test
would only have failed through an assert failure if the underlying fix
were reverted.

Also, add some weight metadata and a comment explaining exactly what is
going on to a trick section of the test case. Originally, we were
getting very unlucky and trying to form a block chain that isn't
actually profitable. I'm working on a fix to avoid forming these
unprofitable chains, and that would also have masked any failure from
this test case. The easy solution is to add some metadata that makes it
*really* profitable to form the bad chain here.

llvm-svn: 145006

Add code for lowering v32i8 shifts by a splat to AVX2 immediate shift instructions. Remove 256-bit splat handling from LowerShift as it was already handled by PerformShiftCombine.

llvm-svn: 145005

llvm-svn: 145004

Remove some of the special classes that worked around an old tablegen limitation of not being able to remove redundant bitconverts from patterns.

llvm-svn: 145003

llvm-svn: 145002

llvm-svn: 145001

llvm-svn: 145000

llvm-svn: 144999

llvm-svn: 144995

formation phase and into the initial walk of the basic blocks. We
essentially pre-merge all blocks where unanalyzable fallthrough exists,
as we won't be able to update the terminators effectively after any
reorderings. This is quite a bit more principled as there may be CFGs
where the second half of the unanalyzable pair has some analyzable
predecessor that gets placed first. Then it may get placed next,
implicitly breaking the unanalyzable branch even though we never even
looked at the part that isn't analyzable. I've included a test case that
triggers this (thanks Benjamin yet again!), and I'm hoping to synthesize
some more general ones as I dig into related issues.

Also, to make this new scheme work we have to be able to handle branches
into the middle of a chain, so add this check. We always fallback on the
incoming ordering.

Finally, this starts to really underscore a known limitation of the
current implementation -- we don't consider broken predecessors when
merging successors. This can caused major missed opportunities, and is
something I'm planning on looking at next (modulo more bug reports).

llvm-svn: 144994

- With the current implementation of sys::Program this always printed "2".
- The command execution code will output the right number anyway (including the signal name).

llvm-svn: 144993

llvm-svn: 144992

constructors go below public member functions?

llvm-svn: 144991

llvm-svn: 144990

Synthesize SSSE3/AVX 128-bit horizontal integer add/sub instructions from add/sub of appropriate shuffle vectors.

llvm-svn: 144989

llvm-svn: 144988

llvm-svn: 144987

llvm-svn: 144986

llvm-svn: 144985

several patches.  These patches fix a problem
where templated types were not being completed the
first time they were used, and fix a variety of
minor issues I discovered while fixing that problem.

One of the previous local patches was resolved in
the most recent Clang, so I removed it.  The others
will be removed in due course.

llvm-svn: 144984

1 - the DIE collections no longer have the NULL tags which saves up to 25%
    of the memory on typical C++ code
2 - faster parsing by not having to run the SetDIERelations() function anymore
    it is done when parsing the DWARF very efficiently.

llvm-svn: 144983

templates is properly complete (though still
empty).

llvm-svn: 144982