RFR: 8287169: compiler/arguments/TestCompileThresholdScaling.java fails on x86_32 after JDK-8287052

[Aleksey Shipilev]

On Mon, 23 May 2022 18:12:23 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> See the bug report, recent regression. I believe the code makes the unwarranted assumption that we run on 64-bit platform, and thus caps at > 2^63 only. It should also cap at > 2^31 for 32-bit platforms.
>> 
>> Attn @dean-long.
>> 
>> Testing:
>>  - [x] Affected test on Linux x86_64 fastdebug (still passes)
>>  - [x] Affected test on Linux x86_32 fastdebug (now passes)
>
> src/hotspot/share/compiler/compilerDefinitions.cpp line 139:
> 
>> 137:     int exp;
>> 138:     (void) frexp(v, &exp);
>> 139:     if (exp > LP64_ONLY(63) NOT_LP64(31)) {
> 
> How about `(exp > (sizeof(intx)*BitsPerByte-1))`?

`(exp > BitsPerWord-1)` then?

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PR: https://git.openjdk.java.net/jdk/pull/8851