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Re: [Qemu-devel] [PATCH v2 16/24] softfloat: Add support for ties-away r
From: |
Richard Henderson |
Subject: |
Re: [Qemu-devel] [PATCH v2 16/24] softfloat: Add support for ties-away rounding |
Date: |
Mon, 06 Jan 2014 10:36:22 -0800 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 |
On 01/06/2014 05:11 AM, Peter Maydell wrote:
> IEEE754-2008 specifies a new rounding mode:
>
> "roundTiesToAway: the floating-point number nearest to the infinitely
> precise result shall be delivered; if the two nearest floating-point
> numbers bracketing an unrepresentable infinitely precise result are
> equally near, the one with larger magnitude shall be delivered."
>
> Implement this new mode (it is needed for ARM). The general principle
> is that the required code is exactly like the ties-to-even code,
> except that we do not need to do the "in case of exact tie clear LSB
> to round-to-even", because the rounding operation naturally causes
> the exact tie to round up in magnitude.
>
> Signed-off-by: Peter Maydell <address@hidden>
> ---
> fpu/softfloat.c | 54
> +++++++++++++++++++++++++++++++++++++++++++++++++
> include/fpu/softfloat.h | 3 ++-
> 2 files changed, 56 insertions(+), 1 deletion(-)
Reviewed-by: Richard Henderson <address@hidden>
r~
- Re: [Qemu-devel] [PATCH v2 06/24] softfloat: Only raise Invalid when conversions to int are out of range, (continued)
- [Qemu-devel] [PATCH v2 22/24] target-arm: A64: Add floating-point<->integer conversion instructions, Peter Maydell, 2014/01/06
- [Qemu-devel] [PATCH v2 23/24] target-arm: A64: Add 1-source 32-to-32 and 64-to-64 FP instructions, Peter Maydell, 2014/01/06
- [Qemu-devel] [PATCH v2 17/24] target-arm: Prepare VFP_CONV_FIX helpers for A64 uses, Peter Maydell, 2014/01/06
- [Qemu-devel] [PATCH v2 07/24] softfloat: Fix factor 2 error for scalbn on denormal inputs, Peter Maydell, 2014/01/06
- [Qemu-devel] [PATCH v2 20/24] target-arm: A64: Add extra VFP fixed point conversion helpers, Peter Maydell, 2014/01/06
- [Qemu-devel] [PATCH v2 16/24] softfloat: Add support for ties-away rounding, Peter Maydell, 2014/01/06
- Re: [Qemu-devel] [PATCH v2 16/24] softfloat: Add support for ties-away rounding,
Richard Henderson <=
- [Qemu-devel] [PATCH v2 10/24] softfloat: Fix float64_to_uint32, Peter Maydell, 2014/01/06
- [Qemu-devel] [PATCH v2 12/24] softfloat: Provide complete set of accessors for fp state, Peter Maydell, 2014/01/06
- [Qemu-devel] [PATCH v2 03/24] softfloat: Add 16 bit integer to float conversions, Peter Maydell, 2014/01/06
- [Qemu-devel] [PATCH v2 09/24] softfloat: Fix float64_to_uint64_round_to_zero, Peter Maydell, 2014/01/06
- [Qemu-devel] [PATCH v2 11/24] softfloat: Fix float64_to_uint32_round_to_zero, Peter Maydell, 2014/01/06
- [Qemu-devel] [PATCH v2 18/24] target-arm: Rename A32 VFP conversion helpers, Peter Maydell, 2014/01/06
- [Qemu-devel] [PATCH v2 05/24] softfloat: Fix float64_to_uint64, Peter Maydell, 2014/01/06
- [Qemu-devel] [PATCH v2 08/24] softfloat: Add float32_to_uint64(), Peter Maydell, 2014/01/06