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Re: [Qemu-arm] [Qemu-devel] [PATCH] target/arm: Honour FPCR.FZ in FRECPX
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From: |
Richard Henderson |
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Subject: |
Re: [Qemu-arm] [Qemu-devel] [PATCH] target/arm: Honour FPCR.FZ in FRECPX |
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Date: |
Mon, 21 May 2018 12:53:34 -0700 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 |
On 05/21/2018 10:27 AM, Peter Maydell wrote:
> The FRECPX instructions should (like most other floating point operations)
> honour the FPCR.FZ bit which specifies whether input denormals should
> be flushed to zero (or FZ16 for the half-precision version).
> We forgot to implement this, which doesn't affect the results (since
> the calculation doesn't actually care about the mantissa bits) but did
> mean we were failing to set the FPSR.IDC bit.
>
> Signed-off-by: Peter Maydell <address@hidden>
> ---
> target/arm/helper-a64.c | 6 ++++++
> 1 file changed, 6 insertions(+)
Reviewed-by: Richard Henderson <address@hidden>
r~