https://llvm.org/bugs/show_bug.cgi?id=31360
Bug ID: 31360
Summary: [X86][SSE] reduceVMULWidth doesn't correctly handle
illegal types
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, llvm-bugs@lists.llvm.org,
mku...@google.com, w...@google.com
Classification: Unclassified
Split off from PR31323 (https://llvm.org/bugs/show_bug.cgi?id=31323#c1).
reduceVMULWidth doesn't handle illegal types, specifically types that don't fit
into a 128-bit xmm register a whole number of times, preventing the use of
CONCAT_VECTORS.
A temporary bail out was added in rL289232 to fix PR31323 but this cause
scalarization when legalization fails to do a good job.
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