[clang] 57ca62d - [clang][Interp] Implement __builtin_copysign

[Timm Bäder via cfe-commits]

Author: Timm Bäder
Date: 2023-07-28T10:55:34+02:00
New Revision: 57ca62d5d35a424722059f42da4a6c75fbba2eb0

URL: https://github.com/llvm/llvm-project/commit/57ca62d5d35a424722059f42da4a6c75fbba2eb0
DIFF: https://github.com/llvm/llvm-project/commit/57ca62d5d35a424722059f42da4a6c75fbba2eb0.diff

LOG: [clang][Interp] Implement __builtin_copysign

Differential Revision: https://reviews.llvm.org/D155368

Added: 
    

Modified: 
    clang/lib/AST/Interp/InterpBuiltin.cpp

Removed: 
    


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diff  --git a/clang/lib/AST/Interp/InterpBuiltin.cpp b/clang/lib/AST/Interp/InterpBuiltin.cpp
index 7d8ca716cc8025..e4c0091452e399 100644
--- a/clang/lib/AST/Interp/InterpBuiltin.cpp
+++ b/clang/lib/AST/Interp/InterpBuiltin.cpp
@@ -130,6 +130,19 @@ static bool interp__builtin_inf(InterpState &S, CodePtr OpPC,
   return true;
 }
 
+static bool interp__builtin_copysign(InterpState &S, CodePtr OpPC,
+                                     const InterpFrame *Frame,
+                                     const Function *F) {
+  const Floating &Arg1 = getParam<Floating>(Frame, 0);
+  const Floating &Arg2 = getParam<Floating>(Frame, 1);
+
+  APFloat Copy = Arg1.getAPFloat();
+  Copy.copySign(Arg2.getAPFloat());
+  S.Stk.push<Floating>(Floating(Copy));
+
+  return true;
+}
+
 bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F) {
   InterpFrame *Frame = S.Current;
   APValue Dummy;
@@ -174,6 +187,13 @@ bool InterpretBuiltin(InterpState &S, CodePtr OpPC, const Function *F) {
     if (interp__builtin_inf(S, OpPC, Frame, F))
       return Ret<PT_Float>(S, OpPC, Dummy);
     break;
+  case Builtin::BI__builtin_copysign:
+  case Builtin::BI__builtin_copysignf:
+  case Builtin::BI__builtin_copysignl:
+  case Builtin::BI__builtin_copysignf128:
+    if (interp__builtin_copysign(S, OpPC, Frame, F))
+      return Ret<PT_Float>(S, OpPC, Dummy);
+    break;
 
   default:
     return false;