http://llvm.org/bugs/show_bug.cgi?id=7620
Summary: MachineLICM should hoist ImplicitDefs.
Product: libraries
Version: 1.0
Platform: PC
OS/Version: All
Status: NEW
Severity: normal
Priority: P
Component: Common Code Generator Code
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
MachineLICM::IsLICMCandidate makes it not hoist implicit defs, however, as the
fixme I added indicates, hoisting an IMPLICIT_DEF may allow hoisting other
instructions that use the impdef as an operand.
Hoisting it should not affect register pressure at all (assuming the RA is
doing the right thing with implicitdef), so just removing that check should be
fine.
However, doing this causes other RA fallout, e.g. test/CodeGen/ARM/spill-q.ll
crashes in the two-address pass.
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