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Guide and override compiler optimizations

AnthropicSoftware Engineer · Onsite
HardSoftware EngineerOnsiteSystem Design

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This question evaluates a candidate's competency in low-level performance engineering and compiler optimization techniques—covering pragmas, intrinsics, manual code transformations, profiling and correctness verification—within the System Design and compiler-aware optimization domain.

A modern compiler sometimes mis-schedules or over-optimizes code for your target VLIW-like backend. Describe how you would guide the compiler using pragmas, intrinsics, restrict/const qualifiers, and flags; when you would apply manual loop unrolling, software pipelining, or inline assembly; and how you would measure the effect safely. Discuss risks around undefined behavior, aliasing, and portability.