From: Richard Henderson <rth@twiddle.net>
To: Tom Musta <tommusta@gmail.com>, qemu-devel@nongnu.org
Cc: qemu-ppc@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 03/18] target-ppc: Add ISA2.06 divdeu[o] Instructions
Date: Mon, 09 Dec 2013 16:05:44 -0800 [thread overview]
Message-ID: <52A65AD8.6000109@twiddle.net> (raw)
In-Reply-To: <1386604035-2507-4-git-send-email-tommusta@gmail.com>
On 12/09/2013 07:47 AM, Tom Musta wrote:
> This patch adds the Divide Doubleword Extended Unsigned
> instructions. This instruction requires dividing a 128-bit
> value by a 64 bit value. Since 128 bit integer division is
> not supported in TCG, a helper is used, providing a
> repeated difference algorithm.
It's long past time we provided this generically.
There's a (slightly) better algorithm than this in target-i386/int_helper.c.
Extra points for stealing the (much) better algorithm from gcc's libgcc2.c.
This ought to go in "host-utils.h" next to mul[us]64.
r~
next prev parent reply other threads:[~2013-12-10 0:06 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-12-09 15:46 [Qemu-devel] [PATCH 00/18] target-ppc: Base ISA V2.06 for Power7/Power8 Tom Musta
2013-12-09 15:46 ` [Qemu-devel] [PATCH 01/18] target-ppc: Add Flag for Power ISA V2.06 Tom Musta
2013-12-18 22:02 ` Scott Wood
2013-12-18 22:09 ` [Qemu-devel] [Qemu-ppc] " Alexander Graf
2013-12-18 22:11 ` Scott Wood
2013-12-18 22:37 ` Alexander Graf
2013-12-19 15:35 ` Tom Musta
2013-12-19 17:17 ` Scott Wood
2013-12-09 15:46 ` [Qemu-devel] [PATCH 02/18] target-ppc: Add ISA2.06 bpermd Instruction Tom Musta
2013-12-10 0:01 ` Richard Henderson
2013-12-10 17:47 ` Tom Musta
2013-12-09 15:47 ` [Qemu-devel] [PATCH 03/18] target-ppc: Add ISA2.06 divdeu[o] Instructions Tom Musta
2013-12-10 0:05 ` Richard Henderson [this message]
2013-12-09 15:47 ` [Qemu-devel] [PATCH 04/18] target-ppc: Add ISA2.06 divde[o] Instructions Tom Musta
2013-12-09 15:47 ` [Qemu-devel] [PATCH 05/18] target-ppc: Add ISA 2.06 divwe[u][o] Instructions Tom Musta
2013-12-10 0:26 ` Richard Henderson
2013-12-10 17:58 ` Tom Musta
2013-12-10 18:30 ` Richard Henderson
2013-12-09 15:47 ` [Qemu-devel] [PATCH 06/18] target-ppc: Add ISA2.06 lbarx, lharx Instructions Tom Musta
2013-12-10 0:31 ` Richard Henderson
2013-12-09 15:47 ` [Qemu-devel] [PATCH 07/18] target-ppc: Add ISA 2.06 stbcx. and sthcx. Instructions Tom Musta
2013-12-10 0:41 ` Richard Henderson
2013-12-09 15:47 ` [Qemu-devel] [PATCH 08/18] target-ppc: Add ISA2.06 Float to Integer Instructions Tom Musta
2013-12-09 15:47 ` [Qemu-devel] [PATCH 09/18] softfloat: Fix Handling of Small Negatives in float64_to_uint64 Tom Musta
2013-12-13 0:13 ` Peter Maydell
2013-12-16 15:20 ` Tom Musta
2013-12-16 15:24 ` Peter Maydell
2013-12-16 15:26 ` Tom Musta
2013-12-09 15:47 ` [Qemu-devel] [PATCH 10/18] softfloat: Fix float64_to_uint64_round_to_zero Tom Musta
2013-12-09 15:47 ` [Qemu-devel] [PATCH 11/18] softfloat: Fix float64_to_uint32 Tom Musta
2013-12-09 15:47 ` [Qemu-devel] [PATCH 12/18] softfloat: Fix float64_to_uint32_round_to_zero Tom Musta
2013-12-09 15:47 ` [Qemu-devel] [PATCH 13/18] target-ppc: Add ISA 2.06 fcfid[u][s] Instructions Tom Musta
2013-12-09 15:47 ` [Qemu-devel] [PATCH 14/18] target-ppc: Fix and enable fri[mnpz] Tom Musta
2013-12-09 15:47 ` [Qemu-devel] [PATCH 15/18] target-ppc: Add ISA 2.06 ftdiv Instruction Tom Musta
2013-12-09 15:47 ` [Qemu-devel] [PATCH 16/18] target-ppc: Add ISA 2.06 ftsqrt Tom Musta
2013-12-09 15:47 ` [Qemu-devel] [PATCH 17/18] target-ppc: Enable frsqrtes on Power7 and Power8 Tom Musta
2013-12-09 15:47 ` [Qemu-devel] [PATCH 18/18] target-ppc: Add ISA2.06 lfiwzx Instruction Tom Musta
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