keil中c&汇编混合编程

barryotugh

[mw_shl_code=c,true]#define ABSDIFF(frame1, frame2) \ ({ \ int result = 0; \ asm volatile( \ "mov %[result], #0\n" /* accumulator */ \ \ "ldr r4, [%[src], #0]\n" /* read data from address + offset*/ \ "ldr r5, [%[dst], #0]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ "ldr r4, [%[src], #4]\n" /* read data from address + offset */ \ "ldr r5, [%[dst], #4]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ \ "ldr r4, [%[src], #(64 * 1)]\n" /* read data from address + offset*/ \ "ldr r5, [%[dst], #(64 * 1)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ "ldr r4, [%[src], #(64 * 1 + 4)]\n" /* read data from address + offset */ \ "ldr r5, [%[dst], #(64 * 1 + 4)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ \ "ldr r4, [%[src], #(64 * 2)]\n" /* read data from address + offset*/ \ "ldr r5, [%[dst], #(64 * 2)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ "ldr r4, [%[src], #(64 * 2 + 4)]\n" /* read data from address + offset */ \ "ldr r5, [%[dst], #(64 * 2 + 4)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ \ "ldr r4, [%[src], #(64 * 3)]\n" /* read data from address + offset*/ \ "ldr r5, [%[dst], #(64 * 3)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ "ldr r4, [%[src], #(64 * 3 + 4)]\n" /* read data from address + offset */ \ "ldr r5, [%[dst], #(64 * 3 + 4)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ \ "ldr r4, [%[src], #(64 * 4)]\n" /* read data from address + offset*/ \ "ldr r5, [%[dst], #(64 * 4)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ "ldr r4, [%[src], #(64 * 4 + 4)]\n" /* read data from address + offset */ \ "ldr r5, [%[dst], #(64 * 4 + 4)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ \ "ldr r4, [%[src], #(64 * 5)]\n" /* read data from address + offset*/ \ "ldr r5, [%[dst], #(64 * 5)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ "ldr r4, [%[src], #(64 * 5 + 4)]\n" /* read data from address + offset */ \ "ldr r5, [%[dst], #(64 * 5 + 4)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ \ "ldr r4, [%[src], #(64 * 6)]\n" /* read data from address + offset*/ \ "ldr r5, [%[dst], #(64 * 6)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ "ldr r4, [%[src], #(64 * 6 + 4)]\n" /* read data from address + offset */ \ "ldr r5, [%[dst], #(64 * 6 + 4)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ \ "ldr r4, [%[src], #(64 * 7)]\n" /* read data from address + offset*/ \ "ldr r5, [%[dst], #(64 * 7)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ "ldr r4, [%[src], #(64 * 7 + 4)]\n" /* read data from address + offset */ \ "ldr r5, [%[dst], #(64 * 7 + 4)]\n" \ "usada8 %[result], r4, r5, %[result]\n" /* difference */ \ \ : [result] "+r" (result) \ : [src] "r" (frame1), [dst] "r" (frame2) \ : "r4", "r5" \ ); \ \ result; \ })[/mw_shl_code]

然后在后边调用：uint32_t temp_dist = ABSDIFF(base1, base2+ii);
出错： error:  #29: expected an expression.                                         
                    temp_dist = ABSDIFF(base1, base2+ii);
请教大神怎么解决

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