I've written ARM assembly for iOS apps to optimize carefully for memory ordering constraints and memory access latency (eg, pipeline stalls), and made use of NEON SIMD for certain critical paths.
This has yielded (ballpark) 2x-5x improvements to runtime performance; some operations essentially become 'free' from the application perspective whereas they took a significant hit previously and could cause UI stuttering and/or significant CPU burn (which also directly correlates to battery life consumption).
Assembly is far from dead in desktop/mobile development.
This has yielded (ballpark) 2x-5x improvements to runtime performance; some operations essentially become 'free' from the application perspective whereas they took a significant hit previously and could cause UI stuttering and/or significant CPU burn (which also directly correlates to battery life consumption).
Assembly is far from dead in desktop/mobile development.