Vaibhav Shrimali <vaibhav.shrimali@xxxxxxxxx> writes:
> now I have stored the memory location, where I need to insert my
> value, in the EDX register. I am not using force_reg() now.
> I have stored the value to be inserted in a rtx type register.
> But how do I set the value of memory location in EDX with the value
> stored in a rtx type register?
> Is there any library function which will allow me to do so?
>
> Here is my code:
>
> if (frame_pointer_needed)
> { rtx r, set1,m1,edx,insn,temp;
> //Here hard frame pointer is pushed onto the stack
> insn = emit_insn (gen_push (hard_frame_pointer_rtx));
> RTX_FRAME_RELATED_P (insn) = 1;
> //Here hard frame pointer is updated
> insn = emit_move_insn (hard_frame_pointer_rtx, stack_pointer_rtx);
> RTX_FRAME_RELATED_P (insn) = 1;
>
> //my code starts from here.
> r = cfun->machine->force_align_arg_pointer;
> r = gen_rtx_PLUS (Pmode, r, -8);
> r = gen_rtx_MEM (Pmode, r);
> edx = gen_rtx_REG (Pmode, DX_REG);
> emit_move_insn(edx,r);
> //EDX now contains the memory location
>
> //Here I have stored the return address pushed on the stack in ret_addr
> //So the following code generates a rtx variable
> //which has the value ret_addr XOR hard_frame_pointer
>
> m1 = simplify_binary_operation(XOR, Pmode, ret_addr,
> hard_frame_pointer_rtx);
> //now how to set memory location in edx with value m1??? Is there
> any function
> //to do so.If not, please suggest me some other way of doing so.
>
> }
You need to put the result of m1 somewhere. There isn't really any
need to call simplify_binary_operation here. To make this work, you
should know precisely which instructions you are doing to generate.
You can just generate them. E.g.,
emit_insn (gen_xorsi3 (DESTREG, SRC1, SRC2));
Ian
