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Stop adding <imp-def> operands when expanding REG_SEQUENCE.

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These extra operands are not needed by register allocators using
VirtRegRewriter, and RAFast don't need them any longer.

By omitting the <imp-def> operands, it becomes possible for the new
register coalescer to track which lanes are valid and which are undef.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@164073 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2012-09-17 23:03:21 +00:00
parent e1b5328717
commit 98279e8d65
1 changed files with 0 additions and 4 deletions
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4
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -1758,10 +1758,6 @@ bool TwoAddressInstructionPass::EliminateRegSequences() {
if (MO.isReg() && MO.isDef() && MO.getReg() == DstReg)
MO.setIsUndef();
}
// Make sure there is a full non-subreg imp-def operand on the
// instruction. This shouldn't be necessary, but it seems that at least
// RAFast requires it.
Def->addRegisterDefined(DstReg, TRI);
DEBUG(dbgs() << "First def: " << *Def);
}