X86 Target Specific Instruction Selection And Avx 512 Support

via “x86 target-specific instruction selection and avx-512 support”

Project moved to: https://github.com/llvm/llvm-project

Unique: Implements sophisticated pattern matching for x86 addressing modes (base + index*scale + displacement) and instruction fusion (e.g., combining add and shift into LEA), reducing instruction count and register pressure. AVX-512 support includes mask register allocation and predicated instruction generation for conditional operations.

vs others: Generates more efficient x86 code than generic code generators because it exploits x86-specific instruction patterns and addressing modes. Better AVX-512 support than competing compilers because it integrates mask register allocation into the register allocator rather than treating masks as side effects.