This code defines **LLVM attributes** typically found in an LLVM...

This code defines LLVM attributes typically found in an LLVM Intermediate Representation (LLVM IR) file. These attributes are used to specify target-specific compilation settings for functions or code generation. Here's what each part does:

1. attributes #0 and attributes #1:

   • These define groups or sets of attributes that can later be applied to specific functions or parts of the code in LLVM IR.

2. target-cpu="x86-64":

   • This specifies the target CPU architecture for which the code is being compiled. In this case, it targets the 64-bit x86 architecture.

3. target-features="+sse,+sse2" (in attributes #0):

   • This indicates that the generated code should use specific processor features (in this case, SSE and SSE2 SIMD instructions). These features are useful for optimizing performance on CPUs that support these extensions.

4. tune-cpu="sandybridge" (in attributes #1):

   • This sets the specific CPU microarchitecture (in this case, "sandybridge") for which the generated code should be optimized. It ensures that code is tuned to perform better on Intel's Sandy Bridge processors.

Summary:

• attributes #0: Compiles for the x86-64 target with support for SSE and SSE2 instruction sets.
• attributes #1: Specifies the x86-64 target but tunes the code to perform optimally on the Sandy Bridge CPU architecture.

These attributes allow LLVM to generate code optimized for specific hardware capabilities.