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Slightly change the meaning of the reMaterialize target hook when the original

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instruction defines subregisters.

Any existing subreg indices on the original instruction are preserved or
composed with the new subreg index.

Also substitute multiple operands mentioning the original register by using the
new MachineInstr::substituteRegister() function. This is necessary because there
will soon be <imp-def> operands added to non read-modify-write partial
definitions. This instruction:

  %reg1234:foo = FLAP %reg1234<imp-def>

will reMaterialize(%reg3333, bar) like this:

  %reg3333:bar-foo = FLAP %reg333:bar<imp-def>

Finally, replace the TargetRegisterInfo pointer argument with a reference to
indicate that it cannot be NULL.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@105358 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-06-02 22:47:25 +00:00
parent 4839d872fc
commit 9edf7deb37
14 changed files with 48 additions and 40 deletions
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3
lib/CodeGen/VirtRegRewriter.cpp
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@@ -667,8 +667,7 @@ static void ReMaterialize(MachineBasicBlock &MBB,
assert(TID.getNumDefs() == 1 &&
"Don't know how to remat instructions that define > 1 values!");
#endif
TII->reMaterialize(MBB, MII, DestReg,
ReMatDefMI->getOperand(0).getSubReg(), ReMatDefMI, TRI);
TII->reMaterialize(MBB, MII, DestReg, 0, ReMatDefMI, *TRI);
MachineInstr *NewMI = prior(MII);
for (unsigned i = 0, e = NewMI->getNumOperands(); i != e; ++i) {
MachineOperand &MO = NewMI->getOperand(i);