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https://issues.apache.org/jira/browse/GROOVY-12065?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18086601#comment-18086601
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ASF GitHub Bot commented on GROOVY-12065:
-----------------------------------------
github-actions[bot] commented on PR #2591:
URL: https://github.com/apache/groovy/pull/2591#issuecomment-4639259214
### JMH summary — classic (commit `94f84ea`)
Speedup vs trailing 90-day baseline on gh-pages. Higher = faster.
`1.00` = in line with history. Per-benchmark ratio, geomean within group.
Time-per-op units inverted so direction is consistent.
| Group | Speedup | n |
|--------|---------|---|
| bench | 0.998 × | 26 |
| core | 1.000 × | 77 |
| grails | 0.982 × | 80 |
<sub>Baseline: <code>dev/bench/jmh/<part>/classic/data.js</code> on
gh-pages, trailing 90 days. <a
href="https://apache.github.io/groovy/dev/bench/jmh/summary.html";>Daily
dashboard</a> · <a
href="https://apache.github.io/groovy/dev/bench/jmh/";>Per-suite raw
data</a></sub>
<!
> Implement peephole optimization for constant loading in bytecode generation
> ---------------------------------------------------------------------------
>
> Key: GROOVY-12065
> URL: https://issues.apache.org/jira/browse/GROOVY-12065
> Project: Groovy
> Issue Type: Improvement
> Reporter: Daniel Sun
> Priority: Major
>
> h3. Background
> Groovy's bytecode generator relied on ad-hoc, per-type conditional branches
> scattered across {{OperandStack}} and {{BytecodeHelper}} to select compact
> constant-loading instructions ({{{}ICONST_x{}}}, {{{}LCONST_x{}}},
> {{{}FCONST_x{}}}, {{{}DCONST_x{}}}, {{{}BIPUSH{}}}, {{{}SIPUSH{}}}) over the
> generic {{LDC}} instruction. This logic was fragile, inconsistent, and
> incomplete — for instance, {{BytecodeHelper.pushConstant()}} was missing the
> {{ICONST_M1}} case for the integer constant {{{}-1{}}}.
> h3. Change
> A new {{PeepholeOptimizingMethodVisitor}} — a {{MethodVisitor}} decorator —
> is introduced and inserted into the per-method visitor chain in
> {{{}AsmClassGenerator{}}}. It intercepts every {{visitLdcInsn}} and
> {{visitIntInsn(BIPUSH/SIPUSH, ...)}} call and rewrites each to the shortest
> valid equivalent opcode:
> ||Value||Emitted instruction||
> |{{int}} −1|{{ICONST_M1}}|
> |{{int}} 0–5|{{ICONST_0}} – {{ICONST_5}}|
> |{{int}} in [−128, 127]|{{BIPUSH}}|
> |{{int}} in [−32768, 32767]|{{SIPUSH}}|
> |{{long}} 0 / 1|{{LCONST_0}} / {{LCONST_1}}|
> |{{float}} 0 / 1 / 2|{{FCONST_0}} / {{FCONST_1}} / {{FCONST_2}}|
> |{{double}} 0 / 1|{{DCONST_0}} / {{DCONST_1}}|
> Signed-zero {{float}} and {{double}} values are handled correctly by
> comparing raw bit patterns (via {{Float.floatToRawIntBits}} /
> {{{}Double.doubleToRawLongBits{}}}) rather than {{{}=={}}}, preserving the
> {{-0.0}} / {{+0.0}} distinction that a straight equality check would collapse.
> All per-type branches previously inlined in {{OperandStack}} are replaced
> with plain {{visitLdcInsn(value)}} calls; the peephole visitor centralizes
> the selection uniformly for every generated method.
> {{BytecodeHelper.pushConstant()}} also gains the previously missing
> {{ICONST_M1}} branch.
>
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