RFR: 8373480: Optimize multiplication by constant multiplier using LEA instructions [v4]

[Jatin Bhateja]

On Mon, 22 Dec 2025 05:59:14 GMT, Galder Zamarreño <galder at openjdk.org> wrote:

> Nice improvement @jatin-bhateja, just some small comments
> 
> Matt did an [Advent of Compiler Optimizations video](https://youtu.be/1X88od0miHs?si=wlYCsbZ1vmJA_rVf) precisely on this topic recently :)

Hi @galderz , Exaclty, JBS description clearly mentions that.

> test/micro/org/openjdk/bench/vm/compiler/ConstantMultiplierOptimization.java line 46:
> 
>> 44: public class ConstantMultiplierOptimization {
>> 45: 
>> 46:     public static int mul_by_25_I(int a) {
> 
> Should this and other methods be annotated with `@ForceInline` just in case?

Kernels are too small and should be inlined, but its better to force inlining, made that change, benchmark performance remains same.

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PR Comment: https://git.openjdk.org/jdk/pull/28759#issuecomment-3680823623
PR Review Comment: https://git.openjdk.org/jdk/pull/28759#discussion_r2638921837