diff options
Diffstat (limited to 'target-microblaze/translate.c')
| -rw-r--r-- | target-microblaze/translate.c | 49 |
1 files changed, 40 insertions, 9 deletions
diff --git a/target-microblaze/translate.c b/target-microblaze/translate.c index dd2865c..d983c8b 100644 --- a/target-microblaze/translate.c +++ b/target-microblaze/translate.c @@ -193,6 +193,7 @@ static inline TCGv *dec_alu_op_b(DisasContext *dc) static void dec_add(DisasContext *dc) { unsigned int k, c; + TCGv cf; k = dc->opcode & 4; c = dc->opcode & 2; @@ -201,17 +202,47 @@ static void dec_add(DisasContext *dc) dc->type_b ? "i" : "", k ? "k" : "", c ? "c" : "", dc->rd, dc->ra, dc->rb); - if (k && !c && dc->rd) + /* Take care of the easy cases first. */ + if (k) { + /* k - keep carry, no need to update MSR. */ + /* If rd == r0, it's a nop. */ + if (dc->rd) { + tcg_gen_add_tl(cpu_R[dc->rd], cpu_R[dc->ra], *(dec_alu_op_b(dc))); + + if (c) { + /* c - Add carry into the result. */ + cf = tcg_temp_new(); + + read_carry(dc, cf); + tcg_gen_add_tl(cpu_R[dc->rd], cpu_R[dc->rd], cf); + tcg_temp_free(cf); + } + } + return; + } + + /* From now on, we can assume k is zero. So we need to update MSR. */ + /* Extract carry. */ + cf = tcg_temp_new(); + if (c) { + read_carry(dc, cf); + } else { + tcg_gen_movi_tl(cf, 0); + } + + if (dc->rd) { + TCGv ncf = tcg_temp_new(); + gen_helper_addkc(ncf, cpu_R[dc->ra], *(dec_alu_op_b(dc)), cf); tcg_gen_add_tl(cpu_R[dc->rd], cpu_R[dc->ra], *(dec_alu_op_b(dc))); - else if (dc->rd) - gen_helper_addkc(cpu_R[dc->rd], cpu_R[dc->ra], *(dec_alu_op_b(dc)), - tcg_const_tl(k), tcg_const_tl(c)); - else { - TCGv d = tcg_temp_new(); - gen_helper_addkc(d, cpu_R[dc->ra], *(dec_alu_op_b(dc)), - tcg_const_tl(k), tcg_const_tl(c)); - tcg_temp_free(d); + tcg_gen_add_tl(cpu_R[dc->rd], cpu_R[dc->rd], cf); + write_carry(dc, ncf); + tcg_temp_free(ncf); + } else { + gen_helper_addkc(cf, cpu_R[dc->ra], *(dec_alu_op_b(dc)), + tcg_const_tl(cf)); + write_carry(dc, cf); } + tcg_temp_free(cf); } static void dec_sub(DisasContext *dc) |
