On Tue, 14 May 2024 00:38:30 GMT, Sandhya Viswanathan
<sviswanat...@openjdk.org> wrote:
>> Scott Gibbons has updated the pull request incrementally with one additional
>> commit since the last revision:
>>
>> Rearrange; add lambdas for clarity
>
> src/hotspot/cpu/x86/stubGenerator_x86_64_string.cpp line 1178:
>
>> 1176: __ andq(eq_mask, lastMask);
>> 1177: if (needToSaveRCX) {
>> 1178: __ movdq(rcx, saveRCX);
>
> movdq is an expensive instruction (about 3 cycle). If we have another gpr
> temporary available here for shiftVal, then we dont need to do save/restore
> rcx.
No longer need to use rcx. Refactored.
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PR Review Comment: https://git.openjdk.org/jdk/pull/16753#discussion_r1605619614
