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Add a FIXME.

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TwoAddressInstructionPass should annotate instructions with <undef>
flags when it lower REG_SEQUENCE instructions.  LiveIntervals should not
be in the business of modifying code (except for kill flags, perhaps).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@141187 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-10-05 16:51:21 +00:00
parent 62c607b741
commit b0e1bc7b99
1 changed files with 4 additions and 0 deletions
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4
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -304,6 +304,10 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// Make sure the first definition is not a partial redefinition. Add an
// <imp-def> of the full register.
// FIXME: LiveIntervals shouldn't modify the code like this. Whoever
// created the machine instruction should annotate it with <undef> flags
// as needed. Then we can simply assert here. The REG_SEQUENCE lowering
// is the main suspect.
if (MO.getSubReg()) {
mi->addRegisterDefined(interval.reg);
// Mark all defs of interval.reg on this instruction as reading <undef>.