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target/ppc: update ca32 in arithmetic substract 

Signed-off-by: Nikunj A Dadhania <nikunj@linux.vnet.ibm.com>
Reviewed-by: Richard Henderson <rth@twiddle.net>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Nikunj A Dadhania 2017-02-27 10:27:56 +05:30 committed by David Gibson
parent 6b10d008a0
commit 33903d0aa4
1 changed files with 10 additions and 1 deletions
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11
target/ppc/translate.c
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@ -827,7 +827,11 @@ static inline void gen_op_arith_compute_ca32(DisasContext *ctx,
}
t0 = tcg_temp_new();
tcg_gen_xor_tl(t0, arg0, arg1);
if (sub) {
tcg_gen_eqv_tl(t0, arg0, arg1);
} else {
tcg_gen_xor_tl(t0, arg0, arg1);
}
tcg_gen_xor_tl(t0, t0, res);
tcg_gen_extract_tl(cpu_ca32, t0, 32, 1);
tcg_temp_free(t0);
@ -1378,17 +1382,22 @@ static inline void gen_op_arith_subf(DisasContext *ctx, TCGv ret, TCGv arg1,
tcg_temp_free(t1);
tcg_gen_shri_tl(cpu_ca, cpu_ca, 32); /* extract bit 32 */
tcg_gen_andi_tl(cpu_ca, cpu_ca, 1);
if (is_isa300(ctx)) {
tcg_gen_mov_tl(cpu_ca32, cpu_ca);
}
} else if (add_ca) {
TCGv zero, inv1 = tcg_temp_new();
tcg_gen_not_tl(inv1, arg1);
zero = tcg_const_tl(0);
tcg_gen_add2_tl(t0, cpu_ca, arg2, zero, cpu_ca, zero);
tcg_gen_add2_tl(t0, cpu_ca, t0, cpu_ca, inv1, zero);
gen_op_arith_compute_ca32(ctx, t0, inv1, arg2, 0);
tcg_temp_free(zero);
tcg_temp_free(inv1);
} else {
tcg_gen_setcond_tl(TCG_COND_GEU, cpu_ca, arg2, arg1);
tcg_gen_sub_tl(t0, arg2, arg1);
gen_op_arith_compute_ca32(ctx, t0, arg1, arg2, 1);
}
} else if (add_ca) {
/* Since we're ignoring carry-out, we can simplify the