https://llvm.org/bugs/show_bug.cgi?id=31223
Bug ID: 31223
Summary: [X86][AVX512] Should KSHIFT map to X86ISD::VSHLI and
VSRLI ?
Product: libraries
Version: trunk
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P
Component: Backend: X86
Assignee: unassignedb...@nondot.org
Reporter: llvm-...@redking.me.uk
CC: craig.top...@gmail.com, elena.demikhov...@intel.com,
llvm-bugs@lists.llvm.org
Classification: Unclassified
X86ISD::VSHLI and VSRLI are for vector shifts within elements but kshift (<X x
i1> mask register types) uses it as a vector element shift (which is closer to
X86ISD::VSHLDQ and VSRLDQ).
So we see shifts such as X86ISD::VSHLI/VSRLI <16 x i1>, #8
This was encountered when I began looking at better VSHLI/VSRLI combining.
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