[clang][bytecode] Reject float-to-int casts on non-numbers (#193968)

clang/lib/AST/ByteCode/Interp.h

@@ -2785,6 +2785,12 @@ template <PrimType Name, class T = typename PrimConv<Name>::T>
 bool CastIntegralFloating(InterpState &S, CodePtr OpPC,
                           const llvm::fltSemantics *Sem, uint32_t FPOI) {
   const T &From = S.Stk.pop<T>();
+
+  if constexpr (isIntegralOrPointer<T>()) {
+    if (!From.isNumber())
+      return false;
+  }
+
   APSInt FromAP = From.toAPSInt();
 
   FPOptions FPO = FPOptions::getFromOpaqueInt(FPOI);

clang/test/AST/ByteCode/c.c

@@ -449,3 +449,5 @@ void strcpyDouble(void) {
 
 int *iptr;
 void ignoredConditional(void) { *iptr = (((_Complex double)1.0 ? 2 : 3), a); } // all-warning {{left operand of comma operator has no effect}}
+
+float r  = (float) (intptr_t) &r; // all-error {{initializer element is not a compile-time constant}}