How a Line of C# Runs on the CPU: From Source to IL, Assembly and Instructions
A line of C# reaches the CPU through two translations: Roslyn turns it into IL, and at run time the JIT turns that into machine code for the machine's ISA, which the CPU runs in a fetch-decode-execute cycle. We read the 30-byte x64 Tier-1 code of TotalQuantity line by line, compare it with its ARM64 version, the 789-byte decimal version and an unoptimized Tier-0 measurement, and explain the x86-64-v2 baseline in .NET 11.
14 Nov 2026
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15 min
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7
