How Go Allocates Registers: The SSA Backend's Linear Scan Pass
Go’s SSA backend uses a greedy linear-scan register allocator that treats the function as one long basic block, moves values into registers just before their use, and spills …
Go
How Go Copies Strings: slicebytetostring, concatstrings and the Builder Pattern
string(b) is a compiler intrinsic that copies unless the bytes are ephemeral, concatenation allocates once via concatstrings with a stack buffer for small results, and …
How Go Deletes Your Bounds Checks: The Facts Table That Proves i < len(s)
The SSA prove pass tracks relations between values in signed, unsigned and pointer domains, propagates numeric limits, and folds IsInBounds to true so the bounds check disappears.
How Go Finds a Substring: AVX2 Assembly in internal/bytealg
strings.Index dispatches to hand-written SSE/AVX2 assembly in internal/bytealg, uses IndexByte to skip to candidate positions, switches to Rabin-Karp for long needles, and picks …
How Go Handles Signals and Context Cancellation Without Losing Signals
Signals land on a thread with a managed signal mask, get bit-packed into a lock-free queue by sigsend, and are forwarded to your channel by one goroutine; context cancellation is a …