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From: Andi Kleen <andi@firstfloor.org>
To: Stefan Weil <weil@mail.berlios.de>
Cc: QEMU Developers <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] [PATCH 5/8] tcg: Add interpreter for bytecode
Date: Sat, 17 Sep 2011 21:03:05 -0700	[thread overview]
Message-ID: <m2pqiyebuu.fsf@firstfloor.org> (raw)
In-Reply-To: <1316289634-18786-5-git-send-email-weil@mail.berlios.de> (Stefan Weil's message of "Sat, 17 Sep 2011 22:00:31 +0200")

Stefan Weil <weil@mail.berlios.de> writes:
> +
> +        switch (opc) {
> +        case INDEX_op_end:
> +        case INDEX_op_nop:
> +            break;

You could probably get some more speed out of this by using a threaded
interpreter with gcc's computed goto extension. That's typically
significantly faster than a plain switch in a loop.

static void *ops[] = {
       &&op1,
       &&op2,
       ...
};

#define NEXT() goto *ops[*tb_ptr++];

        op1:
                ...
                NEXT();

-Andi

-- 
ak@linux.intel.com -- Speaking for myself only

  reply	other threads:[~2011-09-18  4:03 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-09-17 19:59 [Qemu-devel] [PATCH 0/8] tcg/interpreter: Add TCG + interpreter for bytecode (virtual machine) Stefan Weil
2011-09-17 20:00 ` [Qemu-devel] [PATCH 1/8] tcg: Declare TCG_TARGET_REG_BITS in tcg.h Stefan Weil
2011-09-17 20:00 ` [Qemu-devel] [PATCH 2/8] tcg: Don't declare TCG_TARGET_REG_BITS in tcg-target.h Stefan Weil
2011-09-17 20:00 ` [Qemu-devel] [PATCH 3/8] tcg: Add forward declarations for local functions Stefan Weil
2011-09-17 21:40   ` Peter Maydell
2011-09-17 20:00 ` [Qemu-devel] [PATCH 4/8] tcg: Add some assertions Stefan Weil
2011-09-17 20:00 ` [Qemu-devel] [PATCH 5/8] tcg: Add interpreter for bytecode Stefan Weil
2011-09-18  4:03   ` Andi Kleen [this message]
2011-09-18  5:49     ` Stefan Weil
2011-09-18  7:22       ` Paolo Bonzini
2011-09-18 17:54         ` Avi Kivity
2011-09-19  6:52           ` Andi Kleen
2011-09-19 11:56             ` Avi Kivity
2011-09-19 14:48               ` Andi Kleen
2011-09-18 10:18   ` Blue Swirl
2011-09-19 16:43   ` Richard Henderson
2011-09-19 20:24   ` Stuart Brady
2011-10-16 21:54     ` Stuart Brady
2011-09-17 20:00 ` [Qemu-devel] [PATCH 6/8] tcg: Add bytecode generator for tcg interpreter Stefan Weil
2011-09-18 10:03   ` Blue Swirl
2011-09-19 22:28     ` Stuart Brady
2011-10-01 16:54   ` Andreas Färber
2011-10-01 21:25     ` Stefan Weil
2011-10-09 16:19       ` Andreas Färber
2011-09-17 20:00 ` [Qemu-devel] [PATCH 7/8] tcg: Add tcg interpreter to configure / make Stefan Weil
2011-09-18  9:37   ` Blue Swirl
2011-09-18 10:14     ` Stefan Weil
2011-09-17 20:00 ` [Qemu-devel] [PATCH 8/8] ppc: Support tcg interpreter on ppc hosts Stefan Weil
2011-09-17 21:31   ` Peter Maydell
2011-09-17 21:33     ` Stefan Weil
2011-09-18 10:26 ` [Qemu-devel] [PATCH 0/8] tcg/interpreter: Add TCG + interpreter for bytecode (virtual machine) Blue Swirl
2011-09-18 10:49   ` malc
2011-09-18 12:12     ` Blue Swirl
2011-09-18 12:46       ` malc
2011-09-18 13:00         ` Blue Swirl
2011-09-18 13:13           ` malc
2011-09-18 13:26             ` Blue Swirl
2011-09-25 20:37           ` Stefan Weil
2011-10-01 12:02             ` Blue Swirl
2011-09-18 15:02 ` Mulyadi Santosa
2011-09-18 15:13   ` Stefan Weil
2011-09-18 16:39     ` Mulyadi Santosa
2011-09-18 20:15       ` Stefan Weil
2011-09-19 15:14         ` Mulyadi Santosa
2011-09-19  8:40     ` David Gilbert
2011-09-19 10:20       ` Stefan Hajnoczi
2011-09-19 10:27         ` David Gilbert
2011-09-18 18:02 ` Avi Kivity

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