On Tue, 23 Jan 2024 17:21:47 GMT, Quan Anh Mai <qa...@openjdk.org> wrote:
>> Hi,
>>
>> This patch introduces `JitCompiler::isConstantExpression` which can be used
>> to statically determine whether an expression has been constant-folded by
>> the Jit compiler, leading to more constant-folding opportunities. For
>> example, it can be used in `MemorySessionImpl::checkValidStateRaw` to
>> eliminate the lifetime check on global sessions without imposing additional
>> branches on other non-global sessions. This is similar to
>> `__builtin_constant_p` in GCC and clang.
>>
>> Please kindly give your opinion as well as your reviews, thanks very much.
>
> Quan Anh Mai has updated the pull request incrementally with one additional
> commit since the last revision:
>
> ident
src/java.base/share/classes/jdk/internal/misc/JitCompiler.java line 32:
> 30: * Just-in-time-compiler-related queries
> 31: */
> 32: public class JitCompiler {
An alternative name and location is `jdk.internal.vm.ConstantSupport` with
initial class doc:
Defines methods to test if a value has been evaluated to a compile-time
constant value by the HotSpot VM.
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PR Review Comment: https://git.openjdk.org/jdk/pull/17527#discussion_r1463926393
