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| author | Sanjay Patel <spatel@rotateright.com> | 2018-09-30 14:34:01 +0000 |
|---|---|---|
| committer | Sanjay Patel <spatel@rotateright.com> | 2018-09-30 14:34:01 +0000 |
| commit | 1e0f1f645a649a5a453742c4ca10aa0816d3fc0a (patch) | |
| tree | 63b371c09696dab00e8a879f0958ee5183cfece1 /lldb/packages/Python/lldbsuite/test/python_api/thread/main.cpp | |
| parent | 26c119a9c2f1d6866fe5996ef5a039b4fc3749ca (diff) | |
| download | bcm5719-llvm-1e0f1f645a649a5a453742c4ca10aa0816d3fc0a.tar.gz bcm5719-llvm-1e0f1f645a649a5a453742c4ca10aa0816d3fc0a.zip | |
[InstCombine] try to convert vector insert+extract to trunc
This transform is requested for the backend in:
https://bugs.llvm.org/show_bug.cgi?id=39016
...but I figured it was worth doing in IR too, and it's probably
easier to implement here, so that's this patch.
In the simplest case, we are just truncating a scalar value. If the
extract index doesn't correspond to the LSBs of the scalar, then we
have to shift-right before the truncate. Endian-ness makes this tricky,
but hopefully the ASCII-art helps visualize the transform.
Differential Revision: https://reviews.llvm.org/D52439
llvm-svn: 343407
Diffstat (limited to 'lldb/packages/Python/lldbsuite/test/python_api/thread/main.cpp')
0 files changed, 0 insertions, 0 deletions
