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Merging r249718:

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Merging r249718:

r249718 | ast | 2015-10-08 11:52:40 -0700 (Thu, 08 Oct 2015) | 16 lines

[bpf] Do not expand UNDEF SDNode during insn selection lowering

o Before this patch, BPF backend will expand UNDEF node
  to i64 constant 0.
o For second pass of dag combiner, legalizer will run through
  each to-be-processed dag node.
o If any new SDNode is generated and has an undef operand,
  dag combiner will put undef node, newly-generated constant-0 node,
  and any node which uses these nodes in the working list.
o During this process, it is possible undef operand is
  generated again, and this will form an infinite loop
  for dag combiner pass2.
o This patch allows UNDEF to be a legal type.

Signed-off-by: Yonghong Song <yhs@plumgrid.com>

Signed-off-by: Alexei Starovoitov <ast@plumgrid.com>

Details

Committed
astOct 23 2015, 7:02 PM
Parents
rL251176: [lldb-mi] Fix expansion of anonymous structures and unions
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