"Mohamed Shafi" <[EMAIL PROTECTED]> writes: > I have read in the internals that indirect_jump and jump pattern are > necessary in any back-end for the compiler to be build and work > successfully. For any back-end there will be some limitation as to how > big the offset used in the jump instructions can be. If the offset is > too big then the indirect_jump pattern has to utilized. Now my > question is how will i be able to specify the limit of the offset so > the gcc generates indirect_jump pattern instead of the jump pattern? I > hope i am clear.
>From the perspective of insn names, it's not quite accurate to say that jump turns into indirect_jump. It would be more correct to say that when there is a limit to the offset for jump, it needs to use a register. The way to handle this is to set the "length" attribute correctly for each insn, and to change code generation based on the length. See, e.g., the mips.md "jump" insn for an example. Ian
