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| author | Zvi Rackover <zvi.rackover@intel.com> | 2017-07-03 15:47:40 +0000 |
|---|---|---|
| committer | Zvi Rackover <zvi.rackover@intel.com> | 2017-07-03 15:47:40 +0000 |
| commit | d7a1c334ce1f26a056b8b553d2474e895c65c96a (patch) | |
| tree | 8256a5050bbe0e1330dc60633d459da34e864955 /llvm/unittests/Support/MathExtrasTest.cpp | |
| parent | 4eeff394d3db889c3ac60f9cc82cb01e06676336 (diff) | |
| download | llvm-d7a1c334ce1f26a056b8b553d2474e895c65c96a.zip llvm-d7a1c334ce1f26a056b8b553d2474e895c65c96a.tar.gz llvm-d7a1c334ce1f26a056b8b553d2474e895c65c96a.tar.bz2 | |
DAGCombine: Combine BUILD_VECTOR to TRUNCATE
Summary:
Add a combine for creating a truncate to replace a build_vector composed of extracts with
indices that form a stride-2^N series.
Example:
v8i32 V = ...
v4i32 build_vector((extract_elt V, 0), (extract_elt V, 2), (extract_elt V, 4), (extract_elt V, 6))
-->
v4i32 truncate (bitcast V to v4i64)
Related discussion in llvm-dev about canonicalizing shuffles to
truncates in LLVM IR:
http://lists.llvm.org/pipermail/llvm-dev/2017-January/108936.html.
Reviewers: spatel, RKSimon, efriedma, igorb, craig.topper, wolfgangp, delena
Reviewed By: delena
Subscribers: guyblank, delena, javed.absar, llvm-commits
Differential Revision: https://reviews.llvm.org/D34077
llvm-svn: 307036
Diffstat (limited to 'llvm/unittests/Support/MathExtrasTest.cpp')
0 files changed, 0 insertions, 0 deletions