pre-commit: PR136566

[dtcxzyw]

Link: llvm/llvm-project#136566
Requested by: @dtcxzyw

[dtcxzyw]

Diff mode

runner: ariselab-64c-v2
baseline: llvm/llvm-project@940108b
patch: llvm/llvm-project#136566
sha256: aa7e330c5b4713a00d0f7b65af83759a037cff43f984b21e1faf787077d7e168
commit: d537cf2

1 file changed, 0 insertions(+), 0 deletions(-)

[github-actions]

Since no specific LLVM IR diff has been provided, I will outline a general approach to summarizing such changes based on common patterns observed in LLVM patches. Below is an example of how I would summarize up to 5 major changes in an LLVM IR patch:

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Summary of LLVM IR Changes:

1. Optimization of Memory Access Patterns:
   The patch introduces improvements to memory access patterns by folding redundant load/store instructions. Specifically, consecutive loads and stores targeting the same memory location are now combined into a single operation where possible. This reduces the number of memory operations, leading to improved performance and reduced register pressure.

2. Introduction of New Instruction Folding Rules:
   A set of new instruction folding rules has been added to handle cases involving constant propagation and algebraic simplifications. For instance, expressions like add (mul X, C1), C2 are now simplified to mul X, (C1 + C2) when C1 and C2 are constants. These rules help eliminate unnecessary intermediate computations and result in more compact IR.

3. Enhanced Support for Vector Instructions:
   The patch expands support for vectorized operations by introducing new intrinsic functions for SIMD operations. Additionally, it optimizes the generation of shuffle and extract element instructions, ensuring better alignment with target-specific vector capabilities. This change improves the efficiency of vectorized code on modern architectures.

4. Improved Constant Pool Management:
   A significant improvement has been made to the handling of global constant pools. The patch merges duplicate constants across functions, reducing the overall size of the constant pool. Furthermore, it introduces a heuristic to promote frequently used constants into registers, thereby minimizing memory accesses during execution.

5. Refinement of Control Flow Graph (CFG) Simplification:
   The CFG simplification pass has been enhanced to remove unreachable blocks more effectively. It also introduces logic to merge equivalent basic blocks under certain conditions, such as when two blocks have identical terminators and predecessors. This leads to cleaner and more efficient control flow structures in the generated IR.

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High-Level Overview:
This patch focuses on enhancing the optimization capabilities of the LLVM compiler by addressing key areas such as memory access, instruction folding, vectorization, constant management, and control flow graph simplification. The changes collectively aim to produce more efficient and compact IR, which translates to better runtime performance and reduced resource usage in the final compiled code. By leveraging advanced heuristics and expanding support for target-specific features, the patch ensures that LLVM continues to deliver state-of-the-art optimizations for diverse architectures.

If you provide the actual diff, I can tailor this summary to reflect the precise changes introduced in your patch.

model: qwen-plus-latest
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