[clang][Interp] Implement __builtin_isfinite

Differential Revision: https://reviews.llvm.org/D155372
llvm · Jul 31, 2023 · f444f39 · f444f39
1 parent 5962942
commit f444f39
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diff --git a/clang/lib/AST/Interp/InterpBuiltin.cpp b/clang/lib/AST/Interp/InterpBuiltin.cpp
@@ -187,6 +187,15 @@ static bool interp__builtin_isinf(InterpState &S, CodePtr OpPC,
   return true;
 }
 
+static bool interp__builtin_isfinite(InterpState &S, CodePtr OpPC,
+                                     const InterpFrame *Frame,
+                                     const Function *F) {
+  const Floating &Arg = S.Stk.peek<Floating>();
+
+  S.Stk.push<Integral<32, true>>(Integral<32, true>::from(Arg.isFinite()));
+  return true;
+}
+
 bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F) {
   InterpFrame *Frame = S.Current;
   APValue Dummy;
@@ -263,6 +272,11 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F) {
       return Ret<PT_Sint32>(S, OpPC, Dummy);
     break;
 
+  case Builtin::BI__builtin_isfinite:
+    if (interp__builtin_isfinite(S, OpPC, Frame, F))
+      return Ret<PT_Sint32>(S, OpPC, Dummy);
+    break;
+
   default:
     return false;
   }

diff --git a/clang/test/AST/Interp/builtin-functions.cpp b/clang/test/AST/Interp/builtin-functions.cpp
@@ -76,4 +76,7 @@ namespace fmin {
 namespace inf {
   static_assert(__builtin_isinf(__builtin_inf()), "");
   static_assert(!__builtin_isinf(1.0), "");
+
+  static_assert(__builtin_isfinite(1.0), "");
+  static_assert(!__builtin_isfinite(__builtin_inf()), "");
 }