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Re: [PATCH v2 04/12] Hexagon (target/hexagon) properly handle SNaN in df


From: Richard Henderson
Subject: Re: [PATCH v2 04/12] Hexagon (target/hexagon) properly handle SNaN in dfmin/dfmax/sfmin/sfmax
Date: Fri, 11 Feb 2022 11:51:04 +1100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.5.0

On 2/10/22 13:15, Taylor Simpson wrote:
The float??_minnum implementation differs from Hexagon for SNaN,
it returns NaN, but Hexagon returns the other input.  So, we add
checks for NaN before calling it.

test cases added in a subsequent patch to more extensively test USR bits

Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>

This appears to be the same as the IEEE 754-2019 minimumNumber (as opposed to the earlier 754-2008 minNum), which a recent RISC-V revision adopted. We added support for that directly in softfloat: float32_minimum_number et al.


r~



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