RFR: JDK-8301205: Port fdlibm log10 to Java [v2]

[Joe Darcy]

On Fri, 27 Jan 2023 13:47:07 GMT, Raffaello Giulietti <rgiulietti at openjdk.org> wrote:

>> src/java.base/share/classes/java/lang/FdLibm.java line 820:
>> 
>>> 818:             hx = (hx & 0x000f_ffff) | ((0x3ff - i) << 20);
>>> 819:             y  = (double)(k + i);
>>> 820:             x = __HI(x, hx);
>> 
>> `            x = __HI(x, hx);  // replace high word of x with hx`
>
> Otherwise LGTM

Okay; comment added back.

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PR: https://git.openjdk.org/jdk/pull/12242