# Enable CPU intrinsics for AES-NI + SSSE3 on x86_64 targets only.
#
# The qbz-cmaf crate does AES-128-CTR decrypt on every offline-cached
# audio frame. Without AES-NI the decrypt falls back to a software
# implementation that hits ~10 MB/s on a modern CPU; with AES-NI it
# clears 400+ MB/s. For HiRes (200 MB+ tracks) this is the difference
# between a 20-second gap and a sub-second one.
#
# Two things needed on x86_64:
# 1. `target-cpu=x86-64-v3` = Haswell microarchitecture baseline
#    (2013+). Every CPU QBZ realistically runs on supports it. This
#    gives AVX2, BMI2, etc. for general codegen.
# 2. `target-feature=+aes,+ssse3` to explicitly enable the AES-NI
#    instruction set — which is NOT included in x86-64-v3 as a
#    microarch level. Without this flag the `aes` crate's hardware
#    dispatch never gets compiled in, no matter how capable the CPU.
#
# IMPORTANT: these flags MUST be scoped to x86_64 targets. Using
# `[build] rustflags = ...` applies them to every target, which on
# aarch64-apple-darwin (and any other ARM target) corrupts the CPU
# feature inference inside the `ring` crate and fails the build with
# `assertion failed: CAPS_STATIC == MIN_STATIC_FEATURES`. ARM targets
# get their own AES/crypto extensions automatically via `aes` crate's
# armv8 path — we don't need to force anything there.
[target.'cfg(target_arch = "x86_64")']
rustflags = ["-C", "target-cpu=x86-64-v3", "-C", "target-feature=+aes,+ssse3"]