__asm__ __volatile__("movl %0, %%cr0"::"eax" (cr0)); 也可以指定一个缩写,比如: __asm__ __volatile__("movl %0, %%cr0"::"a" (cr0)); 如果你指定一个缩写,比如字母a,则GCC将会根据当前操作表达式中C/C++表达式的宽度决定使用%eax,还是%ax或%al。比如: unsigned short __shrt; __a...
为了保险起见,如果你不想让GCC的优化影响你的内联汇编代码,你最好在前面都加上__volatile__,而不要依赖于编译器的原则,因为即使你非常了解当前编译器的优化原则,你也无法保证这种原则将来不会发生变化。而__volatile__的含义却是恒定的。 2、带有C/C++表达式的内联汇编 GCC允许你通过C/C++表达式指定内联汇编中"I...
为了保险起见,如果你不想让GCC的优化影响你的内联汇编代码,你最好在前面都加上__volatile__,而不要依赖于编译器的原则,因为即使你非常了解当前编译器的优化原则,你也无法保证这种原则将来不会发生变化。而__volatile__的含义却是恒定的。 2、带有C/C++表达式的内联汇编 GCC允许你通过C/C++表达式指定内联汇编中"I...
ADDWF BANKMASK(PORTB),w ; add parameter to port ; the result is already in the required location (W)so we can ; just return immediately RETURN 2、编写c语言程序 //声明调用外部的汇编程序 extern unsigned char add(unsigned char a);void main(void) { volatile unsigned char result;...
__asm__ __volatile__("Instruction List"); 1、__asm__ __asm__是GCC关键字asm的宏定义: #define __asm__ asm __asm__或asm用来声明一个内联汇编表达式,所以任何一个内联汇编表达式都是以它开头的,是必不可少的。 2、Instruction List
(void * x);+inline void ggml_lock_lock(void * x) {+UNUSED(x);+for (int i = 0; i < 10; ++i) {+__asm __volatile("nop");+}+__asm __volatile(+" sev\n"+" wfe\n"+);+}+#else#define ggml_lock_lock(x) UNUSED(x)+#endif#define ggml_lock_unlock(x) UNUSED(x) #...
__asm__ __volatile__("Instruction List"); 1、__asm__ __asm__是GCC关键字asm的宏定义: #define __asm__ asm __asm__或asm用来声明一个内联汇编表达式,所以任何一个内联汇编表达式都是以它开头的,是必不可少的。 2、Instruction List
We've had issues with gcc and 'asm goto' before, and we created a 'asm_volatile_goto()' macro for that in the past: see commits 3f0116c ("compiler/gcc4: Add quirk for 'asm goto' miscompilation bug") and a9f1803 ("compiler/gcc4: Make quirk for asm_volatile_goto() unconditional...
+)约束的不同。 $catexample2.c intmain(int__argc,char*__argv[]) { intcr=5; __asm___volatile_("movl%%cr0,%0" :"=a"(cr)) return0; } $gcc-Sexample2.c $catexample2s main: pushl%ebp movl, %ebp subl $, movl $5, -4(%ebp #cr0=5 #APP movl%cr0,%eax...
extern volatile int16 DLOG_4ch_Size; Step 3 Declare signal net nodes/ variables in C in the file {ProjectName}-Main.cc Note that the DLOG_SIZE is a #define in the {ProjectName}-Settings.h and can be modified if needed. Note these signal nets name may change from system to sy...