* target.h (targetm.address_cost): New.

[pf3gnuchains/gcc-fork.git] / gcc / config / mips / mips.h

diff --git a/gcc/config/mips/mips.h b/gcc/config/mips/mips.h
index 696aff2..24b668b 100644 (file)
--- a/gcc/config/mips/mips.h
+++ b/gcc/config/mips/mips.h
@@ -3385,50 +3385,6 @@ typedef struct mips_args {
 #define FUNCTION_MODE (Pmode == DImode ? DImode : SImode)
 
 \f
-/* An expression giving the cost of an addressing mode that
-   contains ADDRESS.  If not defined, the cost is computed from the
-   form of the ADDRESS expression and the `CONST_COSTS' values.
-
-   For most CISC machines, the default cost is a good approximation
-   of the true cost of the addressing mode.  However, on RISC
-   machines, all instructions normally have the same length and
-   execution time.  Hence all addresses will have equal costs.
-
-   In cases where more than one form of an address is known, the
-   form with the lowest cost will be used.  If multiple forms have
-   the same, lowest, cost, the one that is the most complex will be
-   used.
-
-   For example, suppose an address that is equal to the sum of a
-   register and a constant is used twice in the same basic block.
-   When this macro is not defined, the address will be computed in
-   a register and memory references will be indirect through that
-   register.  On machines where the cost of the addressing mode
-   containing the sum is no higher than that of a simple indirect
-   reference, this will produce an additional instruction and
-   possibly require an additional register.  Proper specification
-   of this macro eliminates this overhead for such machines.
-
-   Similar use of this macro is made in strength reduction of loops.
-
-   ADDRESS need not be valid as an address.  In such a case, the
-   cost is not relevant and can be any value; invalid addresses
-   need not be assigned a different cost.
-
-   On machines where an address involving more than one register is
-   as cheap as an address computation involving only one register,
-   defining `ADDRESS_COST' to reflect this can cause two registers
-   to be live over a region of code where only one would have been
-   if `ADDRESS_COST' were not defined in that manner.  This effect
-   should be considered in the definition of this macro.
-   Equivalent costs should probably only be given to addresses with
-   different numbers of registers on machines with lots of registers.
-
-   This macro will normally either not be defined or be defined as
-   a constant.  */
-
-#define ADDRESS_COST(ADDR) (REG_P (ADDR) ? 1 : mips_address_cost (ADDR))
-
 /* A C expression for the cost of moving data from a register in
    class FROM to one in class TO.  The classes are expressed using
    the enumeration values such as `GENERAL_REGS'.  A value of 2 is