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| author | Tim Northover <tnorthover@apple.com> | 2013-06-14 20:22:21 +0000 |
|---|---|---|
| committer | Tim Northover <tnorthover@apple.com> | 2013-06-14 20:22:21 +0000 |
| commit | 059cead5ed7aa11ce1eae0bcc751ea0d1e23ea75 (patch) | |
| tree | 00c9abb7f59d7ff0ec2c0e35f87153243d20b22a /llvm/lib | |
| parent | 8ca899c781666cabcbbd3f2ef2ae30983bc3219c (diff) | |
| download | bcm5719-llvm-059cead5ed7aa11ce1eae0bcc751ea0d1e23ea75.tar.gz bcm5719-llvm-059cead5ed7aa11ce1eae0bcc751ea0d1e23ea75.zip | |
Mark rematerialized super/sub registers as dead.
When we're rematerializing into a not-quite-right register we already add the
real definition as an imp-def, but we should also be marking the "official"
register as dead, since nothing else is going to use it as a result of this
remat.
Not doing this can affect pressure tracking.
rdar://problem/14158833
llvm-svn: 184002
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/CodeGen/RegisterCoalescer.cpp | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/llvm/lib/CodeGen/RegisterCoalescer.cpp b/llvm/lib/CodeGen/RegisterCoalescer.cpp index 82043c2bf7d..7467bb595aa 100644 --- a/llvm/lib/CodeGen/RegisterCoalescer.cpp +++ b/llvm/lib/CodeGen/RegisterCoalescer.cpp @@ -843,6 +843,7 @@ bool RegisterCoalescer::reMaterializeTrivialDef(CoalescerPair &CP, // been asked for. If so it must implicitly define the whole thing. assert(TargetRegisterInfo::isPhysicalRegister(DstReg) && "Only expect virtual or physical registers in remat"); + NewMI->getOperand(0).setIsDead(true); NewMI->addOperand(MachineOperand::CreateReg(CopyDstReg, true /*IsDef*/, true /*IsImp*/, |
