[llvm] 0b64400 - RegisterClassInfo::computePSetLimit - assert that we actually find a register.

[Simon Pilgrim via llvm-commits]

Author: Simon Pilgrim
Date: 2020-01-15T12:18:12Z
New Revision: 0b64400e0b3de18c99f77380e98da8e5e1a49832

URL: https://github.com/llvm/llvm-project/commit/0b64400e0b3de18c99f77380e98da8e5e1a49832
DIFF: https://github.com/llvm/llvm-project/commit/0b64400e0b3de18c99f77380e98da8e5e1a49832.diff

LOG: RegisterClassInfo::computePSetLimit - assert that we actually find a register.

Fixes "pointer is null" clang static analyzer warning.

Added: 
    

Modified: 
    llvm/lib/CodeGen/RegisterClassInfo.cpp

Removed: 
    


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diff  --git a/llvm/lib/CodeGen/RegisterClassInfo.cpp b/llvm/lib/CodeGen/RegisterClassInfo.cpp
index bdfb2baa716e..1523bd4d1649 100644
--- a/llvm/lib/CodeGen/RegisterClassInfo.cpp
+++ b/llvm/lib/CodeGen/RegisterClassInfo.cpp
@@ -186,6 +186,7 @@ unsigned RegisterClassInfo::computePSetLimit(unsigned Idx) const {
       NumRCUnits = NUnits;
     }
   }
+  assert(RC && "Failed to find register class");
   compute(RC);
   unsigned NReserved = RC->getNumRegs() - getNumAllocatableRegs(RC);
   return TRI->getRegPressureSetLimit(*MF, Idx) -