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| author | Roman Lebedev <lebedev.ri@gmail.com> | 2019-10-07 20:53:00 +0000 |
|---|---|---|
| committer | Roman Lebedev <lebedev.ri@gmail.com> | 2019-10-07 20:53:00 +0000 |
| commit | cb6d851bb65dbba3e4fc6a82226e9b308b11f89c (patch) | |
| tree | d3d9b7d2f163dc4b29e208b2a91e6107094e1611 /lldb/packages/Python/lldbsuite/test/python_api/interpreter/main.c | |
| parent | c3b394ffba583a53e5c1cc45360f18a3e5c023fd (diff) | |
| download | bcm5719-llvm-cb6d851bb65dbba3e4fc6a82226e9b308b11f89c.tar.gz bcm5719-llvm-cb6d851bb65dbba3e4fc6a82226e9b308b11f89c.zip | |
[InstCombine][NFC] dropRedundantMaskingOfLeftShiftInput(): change how we deal with mask
Summary:
Currently, we pre-check whether we need to produce a mask or not.
This involves some rather magical constants.
I'd like to extend this fold to also handle the situation
when there's also a `trunc` before outer shift.
That will require another set of magical constants.
It's ugly.
Instead, we can just compute the mask, and check
whether mask is a pass-through (all-ones) or not.
This way we don't need to have any magical numbers.
This change is NFC other than the fact that we now compute
the mask and then check if we need (and can!) apply it.
Reviewers: spatel
Reviewed By: spatel
Subscribers: hiraditya, llvm-commits
Tags: #llvm
Differential Revision: https://reviews.llvm.org/D68470
llvm-svn: 373961
Diffstat (limited to 'lldb/packages/Python/lldbsuite/test/python_api/interpreter/main.c')
0 files changed, 0 insertions, 0 deletions
