linux编程的108种奇淫巧计-11(乱序)【续】
接上文：linux编程的108种奇淫巧计-11(乱序)用了支持SSE4的CPU，intel core i3，因为支持了palignr指令，所以把上文的代码改用了palignr指令重写了一下如下：
可能由于在虚拟机上运行的原因，性能提升并不显著。
#include<stdio.h>#include<stdlib.h>#include <stddef.h>#include <stdint.h> asm(" .text "); asm(" .typeshl_7, @function "); asm("shl_7: push %rbp "); asm(" mov %rsp,%rbp "); asm("loop: sub $0x80, %rdx "); asm(" movaps-0x07(%rsi), %xmm1 "); asm(" movaps0x09(%rsi), %xmm2"); asm(" movaps0x19(%rsi), %xmm3"); asm(" movaps0x29(%rsi), %xmm4"); asm(" movaps0x39(%rsi), %xmm5"); asm(" movaps0x49(%rsi), %xmm6"); asm(" movaps0x59(%rsi), %xmm7"); asm(" movaps0x69(%rsi), %xmm8"); asm(" movaps0x79(%rsi), %xmm9"); asm(" lea 0x80(%rsi), %rsi "); asm(" palignr $7, %xmm8, %xmm9 "); asm(" palignr $7, %xmm7, %xmm8 "); asm(" palignr $7, %xmm6, %xmm7 "); asm(" palignr $7, %xmm5, %xmm6 "); asm(" palignr $7, %xmm4, %xmm5 "); asm(" palignr $7, %xmm3, %xmm4 "); asm(" palignr $7, %xmm2, %xmm3 "); asm(" palignr $7, %xmm1, %xmm2 "); asm(" movaps%xmm9, 0x70(%rdi)"); asm(" movaps%xmm8, 0x60(%rdi)"); asm(" movaps%xmm7, 0x50(%rdi)"); asm(" movaps%xmm6, 0x40(%rdi)"); asm(" movaps%xmm5, 0x30(%rdi)"); asm(" movaps%xmm4, 0x20(%rdi)"); asm(" movaps%xmm3, 0x10(%rdi)"); asm(" movaps%xmm2, (%rdi) "); asm(" leaveq "); asm(" retq "); asm(" .text "); asm(" .typeshl_7_f, @function "); asm("shl_7_f: push %rbp "); asm(" mov %rsp,%rbp "); asm("loop_f: sub $0x80, %rdx "); asm(" movaps-0x07(%rsi), %xmm1 "); asm(" movaps0x09(%rsi), %xmm2"); asm(" movaps0x19(%rsi), %xmm3"); asm(" movaps0x29(%rsi), %xmm4"); asm(" movaps0x39(%rsi), %xmm5"); asm(" movaps0x49(%rsi), %xmm6"); asm(" movaps0x59(%rsi), %xmm7"); asm(" movaps0x69(%rsi), %xmm8"); asm(" movaps0x79(%rsi), %xmm9"); asm(" lea 0x80(%rsi), %rsi "); asm(" palignr $7, %xmm8, %xmm9 "); asm(" movaps%xmm9, 0x70(%rdi)"); asm(" palignr $7, %xmm7, %xmm8 "); asm(" movaps%xmm8, 0x60(%rdi)"); asm(" palignr $7, %xmm6, %xmm7 "); asm(" movaps%xmm7, 0x50(%rdi)"); asm(" palignr $7, %xmm5, %xmm6 "); asm(" movaps%xmm6, 0x40(%rdi)"); asm(" palignr $7, %xmm4, %xmm5 "); asm(" movaps%xmm5, 0x30(%rdi)"); asm(" palignr $7, %xmm3, %xmm4 "); asm(" movaps%xmm4, 0x20(%rdi)"); asm(" palignr $7, %xmm2, %xmm3 "); asm(" movaps%xmm3, 0x10(%rdi)"); asm(" palignr $7, %xmm1, %xmm2 "); asm(" movaps%xmm2, (%rdi) "); asm(" leaveq "); asm(" retq "); int main(void) { uint8_t * src = (uint8_t*)malloc(sizeof(uint8_t)*(128+7)); uint8_t * des = (uint8_t*)malloc(sizeof(uint8_t)*128); int i = 0; for(;i<128;++i) { src = 0xFF; } src = 0x0; src=0x1; src=0x2; src=0x7; src=0x8; src=0x9; src=0xA; src=0xB; src=0xA; src+=7; shl_7(des,src); i = 0; for(;i<128;++i) { //printf("%d,%d\n",i,des); } i = 0; for(;i<100000000;++i) { #ifdef _SLOW shl_7(des,src); #endif #ifdef _FAST shl_7_f(des,src); #endif } return 0;}
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