FRIDAY, JULY 3, 2026
aarch64 Performance Win
aarch64 adds optimization for ADD (ABS (A), B) intrinsics
New optimization rule for aarch64 targets ADD (ABS (A), B) SIMD operations, potentially improving performance.
The aarch64 backend now recognizes and optimizes the specific pattern of ADD (ABS (A), B) within SIMD operations. A new instruction split, aarch64_abs_plus<mode>, has been added to handle this, aiming to improve the performance of code utilizing these intrinsics.
In Details
AArch64 SIMD optimization: aarch64-simd.md gains a new define_insn_and_split for *aarch64_abs_plus<mode>. This targets the common ADD (ABS (A), B) intrinsic pattern, allowing the compiler to generate more efficient code. It is an ergonomics improvement for users of these specific SIMD intrinsics.
For Context
- aarch64
- The 64-bit ARM architecture, commonly used in mobile devices and servers.
- SIMD
- Single Instruction, Multiple Data. A type of parallel processing where a single instruction operates on multiple data points simultaneously, often used for multimedia and scientific computations.
- intrinsics
- Special functions that map directly to specific processor instructions, providing low-level hardware access from high-level code.