From: Richard Henderson <richard.henderson@linaro.org>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: QEMU Developers <qemu-devel@nongnu.org>,
David Hildenbrand <david@redhat.com>
Subject: Re: [Qemu-devel] [PATCH 2/9] tcg: Add INDEX_op_extract2_{i32,i64}
Date: Wed, 3 Apr 2019 18:37:00 +0700 [thread overview]
Message-ID: <a17fffd5-6242-8efc-a8a6-2ca5a8ae9c3d@linaro.org> (raw)
In-Reply-To: <CAFEAcA8JwtiBSgUg_8kg52GETGd3vbX86nvziXa6ZyvqDPLt5g@mail.gmail.com>
On 3/26/19 8:35 PM, Peter Maydell wrote:
> On Thu, 7 Mar 2019 at 14:47, Richard Henderson
> <richard.henderson@linaro.org> wrote:
>>
>> This will let backends implement the double-word shift operation.
>>
>> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
>> diff --git a/tcg/README b/tcg/README
>> index 603f4df659..ddabf33017 100644
>> --- a/tcg/README
>> +++ b/tcg/README
>> @@ -343,6 +343,11 @@ at bit 8. This operation would be equivalent to
>>
>> (using an arithmetic right shift).
>>
>> +* extract2_i64 dest, t1, t2, pos
>> +
>> +Extract a 64-bit quantity from the concatenation of t2:t1,
>> +beginning at pos.
>> +
>
> I think we should document the valid values of 'pos'.
> My guess is "0 <= pos <= 63".
How about
----
* extract2_i32/i64 dest, t1, t2, pos
For N = {32,64}, extract an N-bit quantity from the concatenation
of t2:t1, beginning at pos. The tcg_gen_extract2_* expander allows
values 0 <= pos <= N, but will expand 0 and N with mov, so only
1 <= pos <= N-1 will be seen by the host tcg_out_op.
----
?
r~
next prev parent reply other threads:[~2019-04-03 11:37 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-07 14:41 [Qemu-devel] [PATCH 0/9] tcg: Add tcg_gen_extract2_{i32,i64} Richard Henderson
2019-03-07 14:41 ` [Qemu-devel] [PATCH 1/9] tcg: Implement tcg_gen_extract2_{i32, i64} Richard Henderson
2019-03-08 23:19 ` Philippe Mathieu-Daudé
2019-03-07 14:41 ` [Qemu-devel] [PATCH 2/9] tcg: Add INDEX_op_extract2_{i32,i64} Richard Henderson
2019-03-07 15:19 ` David Hildenbrand
2019-03-08 23:28 ` Philippe Mathieu-Daudé
2019-03-09 16:37 ` Richard Henderson
[not found] ` <CAFEAcA8JwtiBSgUg_8kg52GETGd3vbX86nvziXa6ZyvqDPLt5g@mail.gmail.com>
2019-04-03 11:37 ` Richard Henderson [this message]
2019-04-03 11:56 ` Peter Maydell
2019-04-13 8:31 ` Richard Henderson
2019-03-07 14:41 ` [Qemu-devel] [PATCH 3/9] tcg: Use extract2 in tcg_gen_shifti_i64 Richard Henderson
2019-03-09 1:00 ` Philippe Mathieu-Daudé
2019-03-09 20:30 ` Aleksandar Markovic
2019-03-10 6:43 ` Richard Henderson
2019-03-07 14:41 ` [Qemu-devel] [PATCH 4/9] tcg: Use extract2 in tcg_gen_deposit_{i32, i64} Richard Henderson
2019-03-09 0:36 ` Philippe Mathieu-Daudé
2019-03-07 14:41 ` [Qemu-devel] [PATCH 5/9] tcg/i386: Support INDEX_op_extract2_{i32, i64} Richard Henderson
2019-03-07 14:41 ` [Qemu-devel] [PATCH 6/9] tcg/arm: Support INDEX_op_extract2_i32 Richard Henderson
2019-03-09 0:11 ` Philippe Mathieu-Daudé
2019-03-07 14:41 ` [Qemu-devel] [PATCH 7/9] tcg/aarch64: Support INDEX_op_extract2_{i32, i64} Richard Henderson
2019-03-08 23:41 ` Philippe Mathieu-Daudé
2019-03-07 14:41 ` [Qemu-devel] [PATCH 8/9] target/arm: Use extract2 for EXTR Richard Henderson
2019-03-07 14:41 ` [Qemu-devel] [PATCH 9/9] target/arm: Simplify BFXIL expansion Richard Henderson
2019-03-09 0:45 ` [Qemu-devel] [Qemu-arm] " Philippe Mathieu-Daudé
2019-03-07 15:23 ` [Qemu-devel] [PATCH 0/9] tcg: Add tcg_gen_extract2_{i32,i64} no-reply
2019-03-07 15:47 ` no-reply
2019-03-08 23:23 ` no-reply
2019-03-08 23:45 ` no-reply
2019-03-09 0:16 ` no-reply
2019-03-09 0:49 ` no-reply
2019-04-09 18:53 ` David Hildenbrand
2019-04-09 19:02 ` Richard Henderson
2019-04-09 19:05 ` David Hildenbrand
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