RFR: 8301838: PPC: continuation yield intrinsic: exception check not needed if yield succeeded [v2]

[Richard Reingruber]

On Wed, 8 Feb 2023 09:17:07 GMT, Richard Reingruber <rrich at openjdk.org> wrote:

>> This small enhancement let's the continuation yield intrinsic return if the yield succeeded.
>> Doing so is ok because there will never be a pending exception if the yield succeeded.
>> 
>> All continuation tests succeeded.
>> 
>> GHA: some cross compiles failed because packages could not be downloaded. I tried to restart these but that didn't work.
>
> Richard Reingruber has updated the pull request incrementally with two additional commits since the last revision:
> 
>  - freeze(JavaThread* current, intptr_t* sp) returns int, so use 32bit compare
>  - Remove duplicated return sequence as Lutz suggested

src/hotspot/cpu/ppc/sharedRuntime_ppc.cpp line 1983:

> 1981:   Label L_pinned;
> 1982: 
> 1983:   __ cmpwi(CCR0, R3_RET, 0);

Since I'm at it: the call above returns `int` so it is better to use a 32bit compare.

-------------

PR: https://git.openjdk.org/jdk/pull/12450