1 ; Duplicate the return into if.end to enable TCE. 2 ; RUN: opt %s -tailcallelim -stats -disable-output |& grep {Number of return duplicated} 3 4 define i32 @fib(i32 %n) nounwind ssp { 5 entry: 6 %cmp = icmp slt i32 %n, 2 7 br i1 %cmp, label %if.then, label %if.end 8 9 if.then: ; preds = %entry 10 br label %return 11 12 if.end: ; preds = %entry 13 %sub = add nsw i32 %n, -2 14 %call = call i32 @fib(i32 %sub) 15 %sub3 = add nsw i32 %n, -1 16 %call4 = call i32 @fib(i32 %sub3) 17 %add = add nsw i32 %call, %call4 18 br label %return 19 20 return: ; preds = %if.end, %if.then 21 %retval.0 = phi i32 [ 1, %if.then ], [ %add, %if.end ] 22 ret i32 %retval.0 23 } 24
