Question

我在C中制作了一个冒泡排序程序，并检查了它的汇编列表文件。但我无法得到for循环的位置。你能让我知道for循环和if语句在哪里？

 #include<stdio.h>

int main()
{
    int arr[5]={2,4,5,6,1};

    int i,j,tmp;

    for(i=0;i<5;i++) 
    {
        for(j=0;j<4;j++)
        {
            if(arr[j]>arr[j+1])
            {
                tmp=arr[j];
                arr[j]=arr[j+1];
                arr[j+1]=tmp;
            }
        }
    }

    for(i=0;i<5;i++){
         printf("  %d",arr[i]);
    }
    printf("\n");

    return 0;   
}

这是汇编列表文件。

; generated by ARM C Compiler, ADS1.2 [Build 848]

; commandline [-O1 -browseinfo "0xff
" -S   -g+ -fk -J:cw:]
        CODE32

        AREA ||.text||, CODE, READONLY

main PROC

|L1.0|

        STMFD    sp!,{r4,lr}

        SUB      sp,sp,#0x18

        MOV      r2,#0x14

        LDR      r1,|L1.148|

        ADD      r0,sp,#4

        BL       __rt_memcpy_w

        MOV      r12,#0

|L1.28|

        MOV      r0,#0

|L1.32|

        ADD      r1,sp,#4

        ADD      r2,sp,#4

        ADD      r3,r2,r0,LSL #2

        LDR      r1,[r1,r0,LSL #2]

        LDR      r2,[r3,#4]

        CMP      r1,r2

        BLE      |L1.72|

        ADD      lr,sp,#4

        STR      r2,[lr,r0,LSL #2]

        STR      r1,[r3,#4]

|L1.72|

        ADD      r0,r0,#1

        CMP      r0,#4

        BLT      |L1.32|

        ADD      r12,r12,#1

        CMP      r12,#5

        BLT      |L1.28|

        MOV      r4,#0

|L1.100|

        ADD      r0,sp,#4

        LDR      r1,[r0,r4,LSL #2]

        ADR      r0,|L1.152|

        BL       _printf

        ADD      r4,r4,#1

        CMP      r4,#5

        BLT      |L1.100|

        ADR      r0,|L1.160|

        BL       _printf

        MOV      r0,#0

        ADD      sp,sp,#0x18

        LDMFD    sp!,{r4,pc}

|L1.148|

        DCD      ||.constdata$1||

|L1.152|

        DCB      "  %d"

        DCB      "\0\0\0\0"

|L1.160|

        DCB      "\n\0\0\0"

        ENDP



        AREA ||.constdata||, DATA, READONLY, ALIGN=2

||.constdata$1||
        DCD      0x00000002
        DCD      0x00000004
        DCD      0x00000005
        DCD      0x00000006
        DCD      0x00000001


        EXPORT main

        IMPORT _main
        IMPORT __main
        IMPORT _printf
        IMPORT __rt_memcpy_w
        IMPORT ||Lib$$Request$$armlib||, WEAK

        KEEP

Answer 1

你走了。如果您只是查找LDR r1,[r1,r0,LSL #2] ; r1 = arr[j] LDR r2,[r3,#4] ; r2 = arr[j+1] CMP r1,r2 ; arr[j] <= arr[j+1] BLE |L1.72| ; jump if yes ADD lr,sp,#4 ; arr STR r2,[lr,r0,LSL #2] ; arr[j] = arr[j+1] STR r1,[r3,#4] ; arr[j+1] = arr[j] |L1.72| ADD r0,r0,#1 ; j++ CMP r0,#4 ; j < 4 BLT |L1.32| ; jump to inner loop if yes ADD r12,r12,#1 ; i++ CMP r12,#5 ; i < 5 BLT |L1.28| ; jump to outer loop if yes和常量，那么您应该能够找到它们：

<flow name="myprojectFlow">
<http:listener config-ref="HTTP_Listener_Configuration1" path="/" doc:name="HTTP"/>
<set-payload doc:name="Set Payload" value="Hi"/>
<request-reply doc:name="RR1">
    <jms:outbound-endpoint queue="req_queue" doc:name="JMS" connector-ref="Active_MQ">
        <jms:transaction action="ALWAYS_BEGIN"/>
    </jms:outbound-endpoint>
    <jms:inbound-endpoint queue="req_queue" doc:name="JMS" connector-ref="Active_MQ">
        <jms:transaction action="ALWAYS_BEGIN"/>
    </jms:inbound-endpoint>
</request-reply>
<logger message="---- payload ---#[payload]" level="INFO" doc:name="Logger"/>
<request-reply doc:name="RR2">
    <jms:outbound-endpoint queue="req_queue1" doc:name="JMS" connector-ref="Active_MQ">
        <jms:transaction action="ALWAYS_BEGIN"/>
    </jms:outbound-endpoint>
    <jms:inbound-endpoint queue="req_queue1" doc:name="JMS" connector-ref="Active_MQ">
        <jms:transaction action="ALWAYS_BEGIN"/>
    </jms:inbound-endpoint>
</request-reply>
<logger message="---- payload1 ---#[payload]" level="INFO" doc:name="Logger"/>

for，如果是汇编语言（冒泡排序）

1 个答案: