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misched: Fix the DAG builder to handle an undef operand at ExitSU.

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Assertion failed: (VNI && "No value to read by operand")
rdar://12790267.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@169071 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Andrew Trick
2012-12-01 01:22:44 +00:00
parent 30fe61aa35
commit 177d87ac8d
2 changed files with 28 additions and 1 deletions
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lib/CodeGen/ScheduleDAGInstrs.cpp
+2 -1
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@@ -210,7 +210,8 @@ void ScheduleDAGInstrs::addSchedBarrierDeps() {
Uses[Reg].push_back(PhysRegSUOper(&ExitSU, -1));
else {
assert(!IsPostRA && "Virtual register encountered after regalloc.");
addVRegUseDeps(&ExitSU, i);
if (MO.readsReg()) // ignore undef operands
addVRegUseDeps(&ExitSU, i);
}
}
} else {