diff options
Diffstat (limited to 'cfrontend/C2Clight.ml')
| -rw-r--r-- | cfrontend/C2Clight.ml | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/cfrontend/C2Clight.ml b/cfrontend/C2Clight.ml index 6fc9b5ca..46242e0f 100644 --- a/cfrontend/C2Clight.ml +++ b/cfrontend/C2Clight.ml @@ -371,7 +371,14 @@ let volatile_write_fun ty = let convertTopExpr env e = match e.edesc with | C.EBinop(C.Oassign, lhs, {edesc = C.ECall(fn, args)}, _) -> - convertFuncall env (Some (convertExpr env lhs)) fn args + (* Recognize __builtin_fabs and turn it into Clight operator *) + begin match fn, args with + | {edesc = C.EVar {name = "__builtin_fabs"}}, [arg1] -> + Sassign(convertExpr env lhs, + Expr(Eunop(Ofabs, convertExpr env arg1), Tfloat F64)) + | _ -> + convertFuncall env (Some (convertExpr env lhs)) fn args + end | C.EBinop(C.Oassign, lhs, rhs, _) -> if Cutil.is_composite_type env lhs.etyp then unsupported "assignment between structs or between unions"; @@ -808,6 +815,9 @@ let builtins_generic = { "__builtin_va_list", C.TPtr(C.TVoid [], []) ]; functions = [ + (* Floating-point absolute value *) + "__builtin_fabs", + (TFloat(FDouble, []), [TFloat(FDouble, [])], false); (* The volatile read/volatile write functions *) "__builtin_volatile_read_int8unsigned", (TInt(IUChar, []), [TPtr(TVoid [], [])], false); |