fix simplemath build, trigger ci on benchmark changes

[nihui]

No description provided.

[tencent-adm]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.97%. Comparing base (421de78) to head (b962377).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6722      +/-   ##
==========================================
+ Coverage   93.90%   93.97%   +0.06%     
==========================================
  Files         933      933              
  Lines      310041   310139      +98     
==========================================
+ Hits       291140   291440     +300     
+ Misses      18901    18699     -202     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[nihui]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. More of your lovely PRs please.

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[Copilot]

Pull request overview

This PR aims to fix build issues around the simplemath implementation (notably INFINITY) and to ensure CI workflows run when benchmark sources change.

Changes:

• Define INFINITY in simplemath.h (guarded) and remove the local INFINITY macro from simplemath.cpp.
• Adjust the LLM benchmark source includes.
• Update multiple GitHub Actions workflows to trigger on benchmark/** changes (excluding benchmark/README.md), and tweak the linux-aarch64 simplestl+simplemath CMake invocation.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
src/simplemath.h	Adds a guarded INFINITY macro for simplemath builds.
src/simplemath.cpp	Removes the local INFINITY macro definition.
benchmark/benchncnn_llm.cpp	Removes <math.h> include (but file uses INFINITY).
.github/workflows/windows.yml	Trigger CI on benchmark path changes (excluding README).
.github/workflows/macos.yml	Trigger CI on benchmark path changes (excluding README).
.github/workflows/linux-x64-sde.yml	Trigger CI on benchmark path changes (excluding README).
.github/workflows/linux-x64-gpu-gcc.yml	Trigger CI on benchmark path changes (excluding README).
.github/workflows/linux-x64-gpu-clang.yml	Trigger CI on benchmark path changes (excluding README).
.github/workflows/linux-x64-cpu-gcc.yml	Trigger CI on benchmark path changes (excluding README).
.github/workflows/linux-x64-cpu-gcc-musl.yml	Trigger CI on benchmark path changes (excluding README).
.github/workflows/linux-x64-cpu-clang.yml	Trigger CI on benchmark path changes (excluding README).
.github/workflows/linux-riscv64.yml	Trigger CI on benchmark path changes (excluding README).
.github/workflows/linux-aarch64.yml	Trigger CI on benchmark path changes and removes explicit benchmark-disable for simplestl+simplemath job.

Comments suppressed due to low confidence (1)

benchmark/benchncnn_llm.cpp:8

• This file uses INFINITY (e.g., for -INFINITY in attention_mask), but <math.h> was removed and none of the included ncnn headers define INFINITY. This will fail to compile on toolchains that don’t predefine INFINITY. Re-add <math.h>/<cmath> or switch to a local definition (e.g., std::numeric_limits<float>::infinity() if available).

#include <float.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[nihui]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Bravo.

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
• Mark a draft as ready
• Comment "@codex review".

If Codex has suggestions, it will comment; otherwise it will react with 👍.

Codex can also answer questions or update the PR. Try commenting "@codex address that feedback".

[Copilot]

Pull request overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated 1 comment.