Posts: Add AoCO 2025 Day 10 Study Notes

[gapry]

No description provided.

[amazon-q-developer]

This PR adds educational study notes about loop unrolling in compiler optimizations. The content includes well-structured examples demonstrating standard loops, manual unrolling, and compiler-based unrolling with corresponding assembly code analysis. No blocking issues identified - the code examples are demonstration-only and the documentation is ready for merge.

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[gemini-code-assist]

Code Review

This pull request adds study notes on loop unrolling, demonstrating the differences between manual and compiler-driven optimizations using std::span. Feedback focuses on a technical issue where using forwarding references with std::span could lead to compilation errors for rvalue containers, as well as several improvements to the text's clarity and grammar.

[gemini-code-assist]

This sentence is quite repetitive. A more concise version would improve the flow of the introduction.

Suggested change

	Written by me and assisted by AI, proofread by me and assisted by AI.
	Written and proofread by me, with AI assistance.

[gemini-code-assist]

The sum function template uses a forwarding reference (T&&), but std::span cannot be safely constructed from rvalue containers (like a temporary std::vector) because they are not 'borrowed ranges'. This will cause a compilation error if sum is called with a temporary container. Using const T& is safer for a generic sum function that uses std::span internally.

Suggested change

	auto sum(T&& dataset) {
	auto sum(const T& dataset) {

[gemini-code-assist]

The phrase "To force on loop unrolling" is slightly confusing. If the intention is to isolate the effect of loop unrolling by disabling vectorization, "To focus on loop unrolling" or "To observe loop unrolling" would be clearer. Alternatively, if you meant to force the optimization, "To force loop unrolling" (without "on") is more idiomatic.

Suggested change

	To force on loop unrolling, we will disable the SIMD by `-fno-vectorize -mno-sse -mno-avx` in the following example.
	To focus on loop unrolling, we will disable the SIMD by -fno-vectorize -mno-sse -mno-avx in the following example.

[gemini-code-assist]

There are a couple of grammatical issues in this sentence: "is as same as" should be "is the same as", and "which manually unrolled" should be "which was manually unrolled". Also, "part02" should be capitalized to match the section header.

Suggested change

	For now, we enable it and see the output assembly is as same as the part02, which manually unrolled in C code.
	For now, we enable it and see the output assembly is the same as Part 02, which was manually unrolled in C code.