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

RKSimon · RKSimon · commit 0b64400e0b3d · 2020-01-15T12:18:12.000Z
Fixes "pointer is null" clang static analyzer warning.
diff --git 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) -

Original file line number	Diff line number	Diff line change
`@@ -186,6 +186,7 @@ unsigned RegisterClassInfo::computePSetLimit(unsigned Idx) const {`
`186`	`186`	`NumRCUnits = NUnits;`
`187`	`187`	`}`
`188`	`188`	`}`
	`189`	`+ assert(RC && "Failed to find register class");`
`189`	`190`	`compute(RC);`
`190`	`191`	`unsigned NReserved = RC->getNumRegs() - getNumAllocatableRegs(RC);`
`191`	`192`	`return TRI->getRegPressureSetLimit(*MF, Idx) -`