高级语言内嵌汇编
语法
- 普通写法
-
- asm volatile (
- “mov %0 %1”\n\t”
- “add $1, %0”
- “=r”(dst)
- “r”(src)
);
- rdtsc写法
-
- asm volatile(“rdtsc\n\t” // Returns the time in EDX:EAX.
- “shl $32, %%rdx\n\t” // Shift the upper bits left.
- “or %%rdx, %0” // ‘Or’ in the lower bits.
- “=a”(msr)
- “rdx”);
