[Issue 3147] Incorrect value range propagation for addition

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http://d.puremagic.com/issues/show_bug.cgi?id=3147


Rob Jacques <sandford at jhu.edu> changed:

           What    |Removed                     |Added
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                 CC|                            |sandford at jhu.edu




--- Comment #1 from Rob Jacques <sandford at jhu.edu>  2009-07-07 08:07:25 PDT ---
Additionally, propagation doesn't work for
byte, ubyte, bool and char.
for operations + * - / % >>

Also
    byte x,y;
    short z;
    z = x<<1; // Error: cannot implicitly convert expression (cast(int)x << 1)
of type int to byte
    z = x << y; // compiles


    // Repeat for >>>

Also
    ubyte x,y=10;
    ubyte z;
    z = -y;  // compiles

Inconsistancies:
    byte x,y;
    short z;
    z += x; //compiles, z = z + x doesn't
    x += y; //compiles, x = x + y doesn't
    x++;    //compiles, x = x+1, doesn't
    ++x;    //compiles, x = x+1, doesn't
    x = x + 1; // Error: cannot implicitly convert expression (cast(int)x + 1)
of type int to byte

    // Again repeat for the other operations/type combos

also
   byte[] x, y, z;
   z[] = x[] * z[]; //compiles
   // repeat for other array operation and type combos

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