On Mon, Jul 18, 2016 at 10:35:13PM +0530, Nikunj A Dadhania wrote: > From: Swapnil Bokade <bokadeswap...@gmail.com> > > Search a byte in the stream of 8bytes provided in the register > > Signed-off-by: Sandipan Das <sandipandas1...@gmail.com> > [ Modified the logic to use lesser temporaries ] > Signed-off-by: Nikunj A Dadhania <nik...@linux.vnet.ibm.com>
rth's reference may obsolete the suggestions below.
> ---
> target-ppc/translate.c | 27 +++++++++++++++++++++++++++
> 1 file changed, 27 insertions(+)
>
> diff --git a/target-ppc/translate.c b/target-ppc/translate.c
> index a57f7dd..8f7ff49 100644
> --- a/target-ppc/translate.c
> +++ b/target-ppc/translate.c
> @@ -856,6 +856,32 @@ static void gen_cmprb(DisasContext *ctx)
> tcg_temp_free(src2hi);
> }
>
> +/* cmpeqb */
> +static void gen_cmpeqb(DisasContext *ctx)
> +{
> + TCGLabel *l1 = gen_new_label();
> + TCGLabel *l2 = gen_new_label();
> + TCGv src1 = tcg_temp_local_new();
> + TCGv t0 = tcg_temp_local_new();
> + TCGv arg1 = cpu_gpr[rB(ctx->opcode)];
> + int i;
> +
> + tcg_gen_andi_tl(src1, cpu_gpr[rA(ctx->opcode)], 0xFF);
> + for (i = 0; i < 64; i += 8) {
> + tcg_gen_shri_tl(t0, arg1, i);
> + tcg_gen_andi_tl(t0, t0, 0xFF);
Shifting direct from the original arg each time seems awkward when you
can just shift a working reg by 8 bits each loop. I suspect that
could save you a temporary.
> + tcg_gen_brcond_tl(TCG_COND_EQ, src1, t0, l1);
> + }
> + tcg_gen_movi_i32(cpu_crf[crfD(ctx->opcode)], 0);
> + tcg_gen_br(l2);
> + gen_set_label(l1);
> + /* Set match bit, i.e. CRF_GT */
> + tcg_gen_movi_i32(cpu_crf[crfD(ctx->opcode)], 1 << CRF_GT);
> + gen_set_label(l2);
You should only need one branch at most, either by initializing the
CRF first, or by moving a variable to it.
> + tcg_temp_free(src1);
> + tcg_temp_free(t0);
> +}
> +
> /* isel (PowerPC 2.03 specification) */
> static void gen_isel(DisasContext *ctx)
> {
> @@ -10040,6 +10066,7 @@ GEN_HANDLER(cmp, 0x1F, 0x00, 0x00, 0x00400000,
> PPC_INTEGER),
> GEN_HANDLER(cmpi, 0x0B, 0xFF, 0xFF, 0x00400000, PPC_INTEGER),
> GEN_HANDLER(cmpl, 0x1F, 0x00, 0x01, 0x00400000, PPC_INTEGER),
> GEN_HANDLER(cmpli, 0x0A, 0xFF, 0xFF, 0x00400000, PPC_INTEGER),
> +GEN_HANDLER_E(cmpeqb, 0x1F, 0x00, 0x07, 0x00600000, PPC_NONE, PPC2_ISA300),
> GEN_HANDLER_E(cmpb, 0x1F, 0x1C, 0x0F, 0x00000001, PPC_NONE, PPC2_ISA205),
> GEN_HANDLER_E(cmprb, 0x1F, 0x00, 0x06, 0x00400001, PPC_NONE, PPC2_ISA300),
> GEN_HANDLER(isel, 0x1F, 0x0F, 0xFF, 0x00000001, PPC_ISEL),
--
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
signature.asc
Description: PGP signature
