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[ARM] ARMLoadStoreOpt::UpdateBaseRegUses should stop on def

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When UpdateBaseRegUses sees an instruction that defines the base
register it must stop, as the base register value it is updating is no
longer live. Ideally we would already have seen the register be killed
(which is already checked for), but the kill flags may be inaccurate
and we have to account for this.

Differential Revision: http://reviews.llvm.org/D10566


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240424 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
John Brawn 2015-06-23 16:02:11 +00:00
parent bd1e605b5c
commit a99d1c85a8
1 changed files with 1 additions and 1 deletions
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2
lib/Target/ARM/ARMLoadStoreOptimizer.cpp
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@ -444,7 +444,7 @@ ARMLoadStoreOpt::UpdateBaseRegUses(MachineBasicBlock &MBB,
return;
}
if (MBBI->killsRegister(Base))
if (MBBI->killsRegister(Base) || MBBI->definesRegister(Base))
// Register got killed. Stop updating.
return;
}