RFR: 8285868: x86_64 intrinsics for floating point methods isNaN, isFinite and isInfinite [v4]

[Srinivas Vamsi Parasa]

On Wed, 18 May 2022 04:26:23 GMT, Srinivas Vamsi Parasa <duke at openjdk.java.net> wrote:

>> src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp line 4785:
>> 
>>> 4783:   kmovbl(dst, tmp);
>>> 4784:   if (opcode == Op_IsFiniteF) {
>>> 4785:     xorl(dst, 0x00000001);
>> 
>> `notl(dst)`?
>
> I can't recall why `notl(dst)` didn't work. Will try it and let you know.

notl(dst) doesn't work. we need to flip only the last bit as the kreg stores the result in the last bit.

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PR: https://git.openjdk.java.net/jdk/pull/8459