求助：GCC内嵌汇编警告

只看该作者 · 2007-7-11 21:53

16位有符号数除法

div16_t divs16_s16(int16_t val0,int16_t val1)
{
div16_t result;
asm(

        "movw    r24,%A1"            " "
        "movw    r22,%A2"            " "
        "mov    r2,r25"                " "
        "sbrc    r2,7"                " "
        "rcall    1f"                    " "
        "mov    r3,r23"                " "
        "sbrc    r3,7"                " "
        "rcall    2f"                    " "
        "call    __udivmodhi4"        " "
        "sbrc    r2,7"                " "
        "rcall    1f"                    " "
        "eor    r3,r2"                " "
        "sbrc    r3,7"                " "
        "rcall    2f"                    " "
        "rjmp    3f"                    " "

"1:"    "com    r25"                " "
        "neg    r24"                " "
        "sbci    r25,0xff"            " "
        "ret"                        " "

"2:"    "com    r23"                " "
        "neg    r22"                " "
        "sbci    r23,0xff"            " "
        "ret"                        " "

"3:"    "movw    %A0,r22"            " "
        "movw    %C0,r24"            " "

:"r="(result)
:"r"(val0),"r"(val1)
:"r2","r3","r22","r23","r24","r25"
    );

    return result;
}

总是产生警告，求高手指点。

只看该作者 · 2007-7-12 10:37

只看该作者 · 2007-7-12 16:18

不是"r=",是"=r"

求助：GCC内嵌汇编警告

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