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| author | Simon Pilgrim <llvm-dev@redking.me.uk> | 2020-01-13 11:07:53 +0000 |
|---|---|---|
| committer | Simon Pilgrim <llvm-dev@redking.me.uk> | 2020-01-13 11:08:12 +0000 |
| commit | 8f49204f26ea8856b870d4c2344b98f4b706bea0 (patch) | |
| tree | 70fb38f062d77cd099787b5d02a25f7e5fb1b920 /lldb/packages/Python/lldbsuite/test/python_api/value/TestValueAPI.py | |
| parent | 7f1cf7d5f658b15abb8bd6840fc01e6d44487a23 (diff) | |
| download | bcm5719-llvm-8f49204f26ea8856b870d4c2344b98f4b706bea0.tar.gz bcm5719-llvm-8f49204f26ea8856b870d4c2344b98f4b706bea0.zip | |
[SelectionDAG] ComputeKnownBits - minimum leading/trailing zero bits in LSHR/SHL (PR44526)
As detailed in https://blog.regehr.org/archives/1709 we don't make use of the known leading/trailing zeros for shifted values in cases where we don't know the shift amount value.
This patch adds support to SelectionDAG::ComputeKnownBits to use KnownBits::countMinTrailingZeros and countMinLeadingZeros to set the minimum guaranteed leading/trailing known zero bits.
Differential Revision: https://reviews.llvm.org/D72573
Diffstat (limited to 'lldb/packages/Python/lldbsuite/test/python_api/value/TestValueAPI.py')
0 files changed, 0 insertions, 0 deletions
