Node:Assembler Coding, Previous:Other Algorithms, Up:Algorithms

Assembler Coding

The assembler subroutines in GMP are the most significant source of speed at small to moderate sizes. At larger sizes algorithm selection becomes more important, but of course speedups in low level routines will still speed up everything proportionally.

Carry handling and widening multiplies that are important for GMP can't be easily expressed in C. GCC asm blocks help a lot and are provided in longlong.h, but hand coding low level routines invariably offers a speedup over generic C by a factor of anything from 2 to 10.

• Assembler Code Organisation:
• Assembler Basics:
• Assembler Carry Propagation:
• Assembler Cache Handling:
• Assembler Floating Point:
• Assembler SIMD Instructions:
• Assembler Software Pipelining:
• Assembler Loop Unrolling: