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| author | Chandler Carruth <chandlerc@gmail.com> | 2014-06-28 05:16:40 +0000 |
|---|---|---|
| committer | Chandler Carruth <chandlerc@gmail.com> | 2014-06-28 05:16:40 +0000 |
| commit | fe05f61e5d4325dd354f686bd1a2f4f17527dbfb (patch) | |
| tree | f480285d95df56995a334c689fa51e251f923b7b /tools/llvm-cov | |
| parent | be56f1605298fab52f9e1e63aee7b64c01479172 (diff) | |
| download | llvm-fe05f61e5d4325dd354f686bd1a2f4f17527dbfb.tar.gz llvm-fe05f61e5d4325dd354f686bd1a2f4f17527dbfb.tar.bz2 llvm-fe05f61e5d4325dd354f686bd1a2f4f17527dbfb.tar.xz | |
[x86] Add handling for splat-like widenings of v16i8 shuffles.
These show up really frequently, not the least with actual splats. =] We
lowered these quite badly before. The new code path tries to widen i8
shuffles to i16 shuffles in a splat-like way. There are still some
inefficiencies in our i16 splat logic though, so we aren't really done
here.
Also, for certain patterns (bit of a gather-and-splat) we still
generate pretty silly code, and I've left a fixme for addressing it.
However, I'm not actually worried about this code pattern as much. The
old shuffle lowering generates a 29 instruction monstrosity for it that
should execute much more slowly.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@211974 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'tools/llvm-cov')
0 files changed, 0 insertions, 0 deletions