https://bugs.llvm.org/show_bug.cgi?id=43605
Bug ID: 43605
Summary: [X86][SSE] X86TTIImpl::getVectorInstrCost - improve
extract/insert element costs
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]
The costs for vector element extraction/insertion are underestimated:
- Non/Unknown immediate index cases should be considered high cost
- Vectors before SSE41 only <8 x i16> has PINSR/PEXTR support (+MOVD/MOVQ from
index=0) - the others must be shuffled+extracted or inserted+shuffled.
- Account for the subvector handling for immediates from vector elements above
the bottom xmm.
- GPR<->XMM can be pretty nasty, assuming throughput cost = 1 is an
underestimate in most cases
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