Re: [Qemu-devel] [PATCH v3 03/10] target/ppc: support for 32-bit carry and overflow

[David Gibson <david@gibson.dropbear.id.au>]

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On Thu, Feb 23, 2017 at 12:32:44PM +0530, Nikunj A Dadhania wrote:
> David Gibson <david@gibson.dropbear.id.au> writes:
> 
> > -static void gen_read_xer(TCGv dst)
> >> +static void gen_read_xer(DisasContext *ctx, TCGv dst)
> >>  {
> >>      TCGv t0 = tcg_temp_new();
> >>      TCGv t1 = tcg_temp_new();
> >> @@ -3715,15 +3719,30 @@ static void gen_read_xer(TCGv dst)
> >>      tcg_gen_or_tl(t0, t0, t1);
> >>      tcg_gen_or_tl(dst, dst, t2);
> >>      tcg_gen_or_tl(dst, dst, t0);
> >> +    if (is_isa300(ctx)) {
> >> +        tcg_gen_shli_tl(t0, cpu_ov32, XER_OV32);
> >> +        tcg_gen_or_tl(dst, dst, t0);
> >> +        tcg_gen_shli_tl(t0, cpu_ca32, XER_CA32);
> >> +        tcg_gen_or_tl(dst, dst, t0);
> >
> > Could you use 2 deposits here, instead of 2 shifts and 2 ors?
> 
> I checked the implementation of tcg_gen_deposit_i64, resultant will have much
> more than 2 shifts + 2 ors.

Ok, fair enough.

-- 
David Gibson			| I'll have my music baroque, and my code
david AT gibson.dropbear.id.au	| minimalist, thank you.  NOT _the_ _other_
				| _way_ _around_!
http://www.ozlabs.org/~dgibson

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