WaveRider2012的笔记

理论上来说，ARM的15个通用寄存器是通用的，但实际上并非如此，特别是在过程调用的过程中。PCS(Procedure Call Standard for Arm architecture)就定义了过程调用中，寄存器的特殊用途。Role in the procedure call standardr15 PC The Program Counter.r14 LR The Link

ARM对PLD指令的详细说法是：Preload Data and Preload Instruction. The processor can signal the memory system that a data or instruction load from an address is likely in the near future.PLtype{cond} [Rn {

By default, the assembler predeclares the following register names:    a1-a4 scratch registers, synonymous with r0-r3    v1-v8 variable registers, synonymous with r4-r11    sb and SB stack bas

最近在ZC702上对ARM Cortex-A9的NEON性能做了些测试。测试代码如下： .balign 4 .global neon_best_pipelne .armneon_best_pipelne: .rept 10000 vmla.f32 q10, q0, q5 vmla.f32