On 19 December 2013 21:04, Richard Henderson <rth@xxxxxxxxxxx> wrote:
> On 12/17/2013 07:12 AM, Peter Maydell wrote:
>
>> + tcg_tmp = tcg_temp_new_i64();
>> +
>> + if (cond < 0x0e) { /* not always */
>> + int label_match = gen_new_label();
>> + label_continue = gen_new_label();
>> + arm_gen_test_cc(cond, label_match);
>> + /* nomatch: */
>> + tcg_gen_movi_i64(tcg_tmp, nzcv << 28);
>> + gen_set_nzcv(tcg_tmp);
>> + tcg_gen_br(label_continue);
>> + gen_set_label(label_match);
>> + }
>
> You can't re-use tcg_tmp across basic blocks like this.
Hmm. I clearly don't entirely understand the rules here.
The TCG README says "temporaries are only live
in a basic block" and "After the end of a basic block, the
content of temporaries is destroyed", which I took to
mean that the value in the temp was dead after the
branch, but that I could freely reuse it for something
else afterwards as long as I wrote a new value to
it (as we're doing here). I guess that's wrong?
thanks
-- PMM
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