mode dependent constants

[brahmaiah vallabhaneni]

Hi, 

I am working for gcc z80 port.
 In z80 the valid constants range depends on the
 instruction that involves the constants.
  If it is an 8 bit operation, the valid range is
       -128 to 127 and it differs in the  16 bit
operations.
  But in gcc I am not able to figure out how to
 handle this. The macro LEGITIMATE_CONSTANT 
 checks for the valid constant range. But actually if
I say 
   some mode dependent check, it does n't work. 

 May be because constants can pass any mode.
  Could you please tell me how to handle this.
 If I am assuming something wrong please let me
know.thanks and regards
V.Brahmaiah

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