x86 SSE constants

[Richard Henderson]

On Fri, Sep 30, 2005 at 04:31:59PM -0700, Dale Johannesen wrote:
> No, there isn't, but it might be a smaller change to add a new 
> constraint....
> having constraints tied to specific constants is pretty ugly, and so is
> having (if (constant value==0)) in a lot of patterns..,,

That's why you'd centralize this into a few functions.  There
are several things that need changing:

  * Match different forms of constant for C.

  * Update vector_move_operand to use that same routine.

  * A routine to determine which of several instructions
    we want to emit.  E.g. xorps instead of pxor for -Os.
    It should return a ATTR_MODE result so that we can 
    call it from the mode attribute of various instructions.

  * A routine that uses the previous to return a const char*
    template to return from the insn output patterns.

For bonus points, handle MMX too.


r~