Code short circuit

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#4707

From: Bruce Salzman
Date: Tue, 06 Dec 2005 23:11

26 lines
1609 bytes

The following constants are defined in winuser.h:
#define SC_SIZE         0xF000
#define SC_MOVE         0xF010
#define SC_MINIMIZE     0xF020
#define SC_MAXIMIZE     0xF030
#define SC_CLOSE        0xF060

When I compile this code, all the case statments are optimized away 
(cmd is a uint passed to a windows message handler):

        switch (cmd & 0xFFF0)
        {
            case SC_MAXIMIZE:
            case SC_RESTORE:
            case SC_MINIMIZE:
            case SC_MOVE:
            case SC_SIZE:
                 return;
            default:
                 break;
        }

Does anyone see why? Even removing the '& 0xFFF0' doesn't matter.

-- 
Bruce

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