[PATCH, CHKP, i386] Fix retval generated for instrumented calls returning values on multiple registers

[Jan Hubicka]

> On Thu, Apr 2, 2015 at 10:17 PM, Jan Hubicka <hubicka@ucw.cz> wrote:
> 
> >>         rtx b0 = gen_rtx_REG (BND64mode, FIRST_BND_REG);
> >>         rtx b1 = gen_rtx_REG (BND64mode, FIRST_BND_REG + 1);
> >> -       retval = gen_rtx_PARALLEL (VOIDmode, gen_rtvec (3, retval, b0, b1));
> >> -       chkp_put_regs_to_expr_list (retval);
> >> +       if (GET_CODE (retval) == PARALLEL)
> >> +         {
> >> +           b0 = gen_rtx_EXPR_LIST (VOIDmode, b0, const0_rtx);
> >> +           b1 = gen_rtx_EXPR_LIST (VOIDmode, b1, const0_rtx);
> >> +           rtx par = gen_rtx_PARALLEL (VOIDmode, gen_rtvec (2, b0, b1));
> >> +           retval = chkp_join_splitted_slot (retval, par);
> >
> > I do not understand this code. Isn't it just droping the original return value
> > constructing prallelcontaining only the BND_REGs?
> 
> Please see chkp_join_splitted_slot that merges two parallels.

I see, OK then :)

Honza
> 
> Uros.