some functions that do Unsigned Comparison using Signed Ints for SourcePawn.

UCMP.java

public class UCMP {
	public static void main(String[] args) {
		System.out.println("Hello World " + UInt32LT(1, -1));
	}
	
	/// x < y
    public static boolean UInt32LT(int x, int y) {
    	boolean sign_x = (x & 0x80000000) != 0;
    	boolean sign_y = (y & 0x80000000) != 0;
    	if( sign_x==sign_y ) {
    		/// lower negative = higher positive.
    		return x < y;
    	}
    	return !sign_x && sign_y;
    }
    
    /// x > y
    public static boolean UInt32GT(int x, int y) {
    	return UInt32LT(y, x);
    }
    
    /// x >= y
    public static boolean UInt32GE(int x, int y) {
    	boolean sign_x = (x & 0x80000000) != 0;
    	boolean sign_y = (y & 0x80000000) != 0;
    	if( sign_x==sign_y ) {
    		/// lower negative = higher positive.
    		return x >= y;
    	}
    	return sign_x && !sign_y;
    }
    
    /// x <= y
    public static boolean UInt32LE(int x, int y) {
    	return UInt32GE(y, x);
    }
}

unsigned_compare.inc

#if defined _unsigned_compare_included
	#endinput
#endif
#define _unsigned_compare_included

/// x < y
stock bool UInt32LT(int x, int y) {
	int sign_x = x & 0x80000000;
	int sign_y = y & 0x80000000;
	if( sign_x==sign_y ) {
		/// lower negative = higher positive.
		return x < y;
	}
	return ~sign_x && sign_y;
}

/// x > y
stock bool UInt32GT(int x, int y) {
	return UInt32LT(y, x);
}

/// x >= y
stock bool UInt32GE(int x, int y) {
	int sign_x = x & 0x80000000;
	int sign_y = y & 0x80000000;
	if( sign_x==sign_y ) {
		/// lower negative = higher positive.
		return x >= y;
	}
	return sign_x && ~sign_y;
}

/// x <= y
stock bool UInt32LE(int x, int y) {
	return UInt32GE(y, x);
}