From: Richard Henderson <rth@twiddle.net>
To: Peter Maydell <peter.maydell@linaro.org>
Cc: qemu-devel@nongnu.org, Aurelien Jarno <aurelien@aurel32.net>
Subject: Re: [Qemu-devel] [PATCH 08/19] target-alpha: use new float64_unordered() function
Date: Thu, 14 Apr 2011 08:14:11 -0700 [thread overview]
Message-ID: <4DA70F43.90701@twiddle.net> (raw)
In-Reply-To: <BANLkTi=Da1ov-kA5evqwZZBkmXn2F6STqw@mail.gmail.com>
On 04/14/2011 02:14 AM, Peter Maydell wrote:
> While we're on the subject of Alpha and flush-to-zero modes,
> do you know what exception bits should get set when Alpha
> flushes a denormal output (not input) to zero?
...
> I think Alpha should set Inexact and not Underflow, but
> I'm not sure -- can you confirm/deny?
Deny.
Page B-8, Add Sub Output Exceptions,
Exponent underflow and disabled:
Supply +0, no exception delivered to user.
Exponent underflow and enabled:
Supply +-MIN denorm, Underflow delivered to user.
Footnote 3, Overflow and Underflow have priority over Inexact.
r~
next prev parent reply other threads:[~2011-04-14 15:14 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-12 21:59 [Qemu-devel] [PATCH 00/19] softfloat and FPU fixes/improvements Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 01/19] softfloat: use GCC builtins to count the leading zeros Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 02/19] cpu-all.h: define CPU_LDoubleU Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 03/19] target-i386: use CPU_LDoubleU instead of a private union Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 04/19] target-i386: use float unions from cpu-all.h Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 05/19] target-i386: add floatx_{add, mul, sub} and use them Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 06/19] softfloat: add float*_unordered_{, quiet}() functions Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 07/19] softfloat-native: add float*_unordered_quiet() functions Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 08/19] target-alpha: use new float64_unordered() function Aurelien Jarno
2011-04-13 14:52 ` Peter Maydell
2011-04-13 15:38 ` Richard Henderson
2011-04-13 15:42 ` Peter Maydell
2011-04-13 15:53 ` Richard Henderson
2011-04-13 18:18 ` Aurelien Jarno
2011-04-14 9:14 ` Peter Maydell
2011-04-14 15:14 ` Richard Henderson [this message]
2011-04-14 15:39 ` Peter Maydell
2011-04-14 16:27 ` Richard Henderson
2011-04-14 16:48 ` Peter Maydell
2011-04-14 17:01 ` Richard Henderson
2011-04-12 21:59 ` [Qemu-devel] [PATCH 09/19] target-mips: use new float*_unordered*() functions Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 10/19] target-i386: fix CMPUNORDPS/D and CMPORDPS/D instructions Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 11/19] softfloat: rename float*_eq() into float*_eq_quiet() Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 12/19] softfloat: rename float*_eq_signaling() into float*_eq() Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 13/19] softfloat: move float*_eq and float*_eq_quiet Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 14/19] softfloat: improve description of comparison functions Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 15/19] target-arm: fix wrong usage of floatx80_eq_quiet() Aurelien Jarno
2011-04-12 22:41 ` Peter Maydell
2011-04-13 18:11 ` Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 16/19] target-alpha: fix wrong usage of float64_eq_quiet() Aurelien Jarno
2011-04-13 15:15 ` Peter Maydell
2011-04-12 21:59 ` [Qemu-devel] [PATCH 17/19] target-ppc: fix SPE comparison functions Aurelien Jarno
2011-04-13 2:40 ` Nathan Froyd
2011-04-13 18:11 ` Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 18/19] target-mips: simplify FP comparisons Aurelien Jarno
2011-04-12 21:59 ` [Qemu-devel] [PATCH 19/19] target-mips: don't hardcode softfloat exception bits Aurelien Jarno
2011-04-13 15:45 ` [Qemu-devel] [PATCH 00/19] softfloat and FPU fixes/improvements Peter Maydell
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