RFR: 8279508: Auto-vectorize Math.round API [v6]

[Jatin Bhateja]

On Wed, 23 Feb 2022 01:31:24 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>> Jatin Bhateja has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   8279508: Fixing for windows failure.
>
> src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp line 4146:
> 
>> 4144:   vaddpd(xtmp1, src , xtmp1, vec_enc);
>> 4145:   vrndscalepd(dst, xtmp1, 0x4, vec_enc);
>> 4146:   evcvtpd2qq(dst, dst, vec_enc);
> 
> Why do we need vrndscalepd in between, could we not directly use cvtpd2qq after vaddpd?

Thanks @sviswa7 , when a conversion is inexact, the value returned is rounded according to the rounding control bits in the MXCSR register or the embedded rounding control bits. DONE.

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PR: https://git.openjdk.java.net/jdk/pull/7094