[llvm] [llubi] Implement intrinsics for integer arithmetic/bit manipulation (PR #193702)

[Nikita Popov via llvm-commits]

================
@@ -381,6 +472,171 @@ class InstExecutor : public InstVisitor<InstExecutor, void>,
       }
       return AnyValue();
     }
+    case Intrinsic::ssa_copy:
+    case Intrinsic::expect:
+    case Intrinsic::expect_with_probability:
+      return getValue(CB.getArgOperand(0));
+    case Intrinsic::donothing:
+      return AnyValue();
+    case Intrinsic::vscale:
+      return APInt(RetTy->getScalarSizeInBits(), Ctx.getVScale());
----------------
nikic wrote:

> vscale is a positive power-of-two integer that is constant throughout program execution, but is unknown at compile time. If the result value does not fit in the result type, then the result is a [poison value](https://llvm.org/docs/LangRef.html#poisonvalues).

Missing poison handling.

https://github.com/llvm/llvm-project/pull/193702