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RegisterCoalescer: Do not look for regclass of IMPLICIT_DEF.

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IMPLICIT_DEF is a generic instruction and has no (fixed) output register
class defined. The rematerialization code of the register coalescer
should not scan the instruction description for a register class.

This fixes a problem showing up in
test/CodeGen/R600/subreg-coalescer-crash.ll with subregister liveness
enabled.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@229443 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun 2015-02-16 22:05:12 +00:00
parent 0638f4e115
commit 1f67650f77
1 changed files with 7 additions and 6 deletions
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13
lib/CodeGen/RegisterCoalescer.cpp
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@ -913,12 +913,13 @@ bool RegisterCoalescer::reMaterializeTrivialDef(CoalescerPair &CP,
const TargetRegisterClass *NewRC = CP.getNewRC();
unsigned NewIdx = NewMI->getOperand(0).getSubReg();
if (NewIdx)
NewRC = TRI->getMatchingSuperRegClass(NewRC, DefRC, NewIdx);
else
NewRC = TRI->getCommonSubClass(NewRC, DefRC);
assert(NewRC && "subreg chosen for remat incompatible with instruction");
if (DefRC != nullptr) {
if (NewIdx)
NewRC = TRI->getMatchingSuperRegClass(NewRC, DefRC, NewIdx);
else
NewRC = TRI->getCommonSubClass(NewRC, DefRC);
assert(NewRC && "subreg chosen for remat incompatible with instruction");
}
MRI->setRegClass(DstReg, NewRC);
updateRegDefsUses(DstReg, DstReg, DstIdx);