Re: [Sdcc-user] Optimizations 2

[Fiorenzo D. R. <fd....@ti...>]

  ----- Original Message -----=20
  From: Alex Karahalios=20
  To: sdc...@li...=20
  Sent: Saturday, January 11, 2003 7:33 PM
  Subject: Re: [Sdcc-user] Optimizations 2


  Hi Fiorenzo,

  The peephole optimizing you suggest will probably work in most cases. =
But you have to remember that AR0 is not always the same as R0. If you =
switch register banks then AR0 might still be at location 0, but R0 may =
be at location 8.

  Alex Karahalios

  Hello,

  Usually register bank selected with psw.3,4 is the same as defined by =
ar0..ar7.
  The scope of the optimization is to obviate to sdcc's simplified =
registers management.
  Compiler always generates the memory address, for registers r0..r7 =
too, to avoid wrong instructions like push r0.
  The only way to optimize resultant code is by peephole optimizer.
  However, last word to the developers...
  Fiorenzo Ramaglia
  Italy
  fd....@ti...