“ARM inline Assembler”的版本间的差异
来自个人维基
free6d1823（讨论 | 贡献） （以“asm(code : output operand list : input operand list : clobber list); Referernce: http://www.ethernut.de/en/documents/arm-inline-asm.html”为内容创建页面） |
free6d1823（讨论 | 贡献） |
||
| 第1行： | 第1行： | ||
asm(code : output operand list : input operand list : clobber list); | asm(code : output operand list : input operand list : clobber list); | ||
| + | |||
| + | example: Rotating bits example | ||
| + | int x; | ||
| + | int y; | ||
| + | y= (x>>1); | ||
| + | |||
| + | <source lang="c"> | ||
| + | asm("mov %[result], %[value], ror #1" : [result] "=r" (y) : [value] "r" (x)); | ||
| + | </source> | ||
| + | |||
| + | register value (r1) = x | ||
| + | register result (r2) = y | ||
| + | result = (value >> 1) | ||
| + | |||
Referernce: http://www.ethernut.de/en/documents/arm-inline-asm.html | Referernce: http://www.ethernut.de/en/documents/arm-inline-asm.html | ||
2019年11月8日 (五) 11:41的版本
asm(code : output operand list : input operand list : clobber list);
example: Rotating bits example
int x;
int y;
y= (x>>1);
asm("mov %[result], %[value], ror #1" : [result] "=r" (y) : [value] "r" (x));
register value (r1) = x
register result (r2) = y
result = (value >> 1)
Referernce: http://www.ethernut.de/en/documents/arm-inline-asm.html
