ALTERA DOES NOT WARRANT THAT THE FUNCTIONS CONTAINED IN THIS PATCH
WILL MEET YOUR REQUIREMENTS, OR THAT THE OPERATION OF THIS PATCH
WILL BE UNINTERRUPTED OR ERROR-FREE.

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quartus-11.0-1.40-readme.txt
Readme file for Quartus II 11.0 SP1 Patch 1.40
Copyright (C) Altera Corporation 2011 All right reserved.
Patch created on December 16 2011
Patch SPR#: ######
SPRs fixed: 
//****************************************************************

Problem: This applies to error about index value out of range of 
         object, when issued under a loop and the loop index is 
         part of the index expression. Sometimes Quartus does not 
         figure out that a branch under an if statement in VHDL 
         will not happen for certain values of the loop variable 
         and issues and error if it appears that the 'if' part is 
         accessing object out of bounds, while only the 'else' 
         part will be taken for that value of the loop varaible. 
         This happens when some of the variables have a limited 
         range, e.g. NATURAL range of 0 to 5, so that would 
         guarantee the expression is limited in scope.


Solution: This patch fixes the above problem. The patch is only 
          active under INI varaible vrfx_optimize_if_dead_code=on. 
          The patch will only apply if all of the floowing apply:
          
            1. An if statement under a for loop.
            2. The if is a compare of two integer expressions using <, <=, >, >= or =.
            3. The loop variable occurs in the if expressions.
            4. The expression in the if is limited to +, -, and *


Caution - You must either have previously installed the
          Quartus II 11.0 SP1 software or must
          install the Quartus II 11.0 SP1 software
          before installing this patch. Otherwise, the patch will
          not be installed correctly and the Quartus II
          software will not run properly.