[llvm] r251885 - RegisterPressure: Improve assert message

[Matthias Braun via llvm-commits]

Author: matze
Date: Mon Nov  2 19:53:36 2015
New Revision: 251885

URL: http://llvm.org/viewvc/llvm-project?rev=251885&view=rev
Log:
RegisterPressure: Improve assert message

Modified:
    llvm/trunk/lib/CodeGen/RegisterPressure.cpp

Modified: llvm/trunk/lib/CodeGen/RegisterPressure.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/RegisterPressure.cpp?rev=251885&r1=251884&r2=251885&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/RegisterPressure.cpp (original)
+++ llvm/trunk/lib/CodeGen/RegisterPressure.cpp Mon Nov  2 19:53:36 2015
@@ -862,7 +862,8 @@ getUpwardPressureDelta(const MachineInst
     unsigned MNew = MOld;
     // Ignore DeadDefs here because they aren't captured by PressureChange.
     unsigned PNew = POld + PDiffI->getUnitInc();
-    assert((PDiffI->getUnitInc() >= 0) == (PNew >= POld) && "PSet overflow");
+    assert((PDiffI->getUnitInc() >= 0) == (PNew >= POld)
+           && "PSet overflow/underflow");
     if (PNew > MOld)
       MNew = PNew;
     // Check if current pressure has exceeded the limit.