RFR: 8308850: Change JVM options with small ranges that get -Wconversion warnings to 32 bits [v7]

[Coleen Phillimore]

On Thu, 10 Aug 2023 16:07:14 GMT, Ioi Lam <iklam at openjdk.org> wrote:

>> Afshin Zafari has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Fixed a missed option.
>
> src/hotspot/share/jvmci/jvmciCompilerToVMInit.cpp line 261:
> 
>> 259:   do_int_flag(AllocatePrefetchLines)                                       \
>> 260:   do_int_flag(AllocatePrefetchStepSize)                                    \
>> 261:   do_int_flag(AllocatePrefetchStyle)                                       \
> 
> Why is AllocatePrefetchInstr not changed? It seems to use 0-3 only.

Looks like from the constraints, it's allowed to be max_intx on some platforms, so changing this would be a functional change.

JVMFlag::Error AllocatePrefetchInstrConstraintFunc(intx value, bool verbose) {
  intx max_value = max_intx;
#if defined(X86)
  max_value = 3;
#endif

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PR Review Comment: https://git.openjdk.org/jdk/pull/15164#discussion_r1290427987