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Re: [Qemu-devel] [PATCH 08/12] ARM: Return correct result for single<->d
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From: |
Richard Henderson |
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Subject: |
Re: [Qemu-devel] [PATCH 08/12] ARM: Return correct result for single<->double conversion of NaN |
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Date: |
Wed, 01 Dec 2010 09:52:13 -0800 |
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User-agent: |
Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.12) Gecko/20101103 Fedora/1.0-0.33.b2pre.fc14 Thunderbird/3.1.6 |
On 12/01/2010 07:39 AM, Nathan Froyd wrote:
> RTH (CC'd) is the expert on the Alpha bits.
The Alpha cmptun is supposed to return true for both Q+SNaN.
Although, Invalid Operand is supposed to be raised for SNaN,
which is not happening here in helper_cmptun. Or, indeed,
any of the comparison helper functions.
I think I've lost the thread a bit -- is the proposal to
replace the existing float*_is_nan with _is_quiet_nan and
invent a new function that returns true for both Q+S? That
at least would be monotonic improvement for Alpha, although
as noted above not 100% correct.
r~