[Sablevm-bugs] [ sablevm-Bugs-753040 ] f2i with large integers

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Bugs item #753040, was opened at 2003-06-11 22:58
Message generated for change (Comment added) made by davidbelanger
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105523&aid=753040&group_id=5523

Category: None
Group: None
>Status: Closed
Resolution: None
Priority: 5
Submitted By: David Bélanger (davidbelanger)
Assigned to: Nobody/Anonymous (nobody)
Summary: f2i with large integers

Initial Comment:

Converting a float that has a value larger than the
largest int to an int does not always give the largest
int as specified in the specification.

public class BugF2I {

  public static int f2i(float v) {
    return (int) v;
  }

  public static void main(String[] args) {
    System.out.println(Integer.MAX_VALUE);
    System.out.println(f2i(Integer.MAX_VALUE + 1.0f));
    System.out.println((int) 7777779123.32f);
    System.out.println(f2i(7777779123.32f));
  }

}

Note: Compiled with jikes on ppc and with javac on x86.

jikes / sablevm / ppc
2147483647
2147483647
-812155392
2147483647

jikes / sablevm / x86
2147483647
-2147483648
-812155392
-2147483648

jikes / java / x86
2147483647
2147483647
-812155392
2147483647

javac / java / x86
2147483647
2147483647
2147483647
2147483647

javac / sablevm / x86
2147483647
-2147483648
2147483647
-2147483648

javac / sablevm / ppc
2147483647
2147483647
2147483647
2147483647


David

----------------------------------------------------------------------

>Comment By: David Bélanger (davidbelanger)
Date: 2003-06-12 18:12

Message:
Logged In: YES 
user_id=694080


Hi,

I upgrade jikes to 1.18 (there was some other bug in 1.15)
and it fixed also this problem on jikes / sablevm / ppc.  It
may be a jikes 1.15 bug, I tried again with javac / sablevm
/ x86 (though on a different machine) and I got the right
result this time.

To summarize, jikes 1.15 appears to have problems evaluating
constant expression with floating points at compile time
(constant folding) that were fixed in later versions.

David


----------------------------------------------------------------------

You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105523&aid=753040&group_id=5523