Explain Go assembly and performance optimization techniques.

Go Assembly and Optimization: • Plan 9 assembly syntax • go tool compile -S shows assembly • go tool objdump for disassembly • Compiler optimizations • Profile-guided optimization Optimization techniques: • Avoid allocations in hot paths • Use sync.Pool for object reuse • Prefer value types over pointers • Inline small functions • Use build constraints for platform-specific code Profiling: go tool pprof cpu.prof go tool pprof mem.prof Benchmarking: go test -bench=. -benchmem go test -bench=. -cpuprofile=cpu.prof Assembly example: //go:noescape func add(a, b int64) int64 // add_amd64.s TEXT ·add(SB), NOSPLIT, $0-24 MOVQ a+0(FP), AX ADDQ b+8(FP), AX MOVQ AX, ret+16(FP) RET Compiler directives: //go:noinline //go:nosplit //go:noescape //go:linkname