https://bugs.llvm.org/show_bug.cgi?id=41454
Bug ID: 41454
Summary: [X86] Support X86ISD::VPTERNLOG ternary logic on all
SSE/AVX targets
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: enhancement
Priority: P
Component: Backend: X86
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected],
[email protected]
AVX512 has the VPTERNLOG instructions which can be used to describe all truth
table lookups for a 3bit index created from the same bit from 3 registers and a
i8 immediate control word.
It'd be very useful to use this to combine ternary logic patterns using this
DAG node and lower to optimized bitops patterns on all SSE/AVX targets, not
just AVX512.
This is a big generalization of the canonicalizeBitSelect function that we
already have.
Examples can be found at:
http://www.0x80.pl/articles/avx512-ternary-functions.html
https://github.com/WojciechMula/ternary-logic
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