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.global fast_multiply
fast_multiply:
    LDR r0, [r0]       @ load the first operand into r0
    LDR r1, [r1]       @ load the second operand into r1
    MUL r0, r0, r1     @ multiply the two operands
    BX  lr             @ return the result

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int main()
{
    int a = 10;
    int b = 20;
    int result;

    asm volatile (
        "ldr r0, [%1]
"    // load the first operand into r0
        "ldr r1, [%2]
"    // load the second operand into r1
        "bl fast_multiply
"// call the fast_multiply function
        "mov %0, r0"        // save the result to "result"
        :
        :"r" (result), "r" (&a), "r" (&b)
        :"r0", "r1"         // clobbered registers
    );

    printf("Result: %d
", result);

    return 0;
}

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$ gcc -march=armv7-a -c main.c

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$ gcc -O2 -march=armv7-a -c main.c

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$ gcc -march=armv7-a -mfpu=none -mfloat-abi=softfp -c main.c

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#include 
  
   

int main()
{
    int a = 10;
    int b = 20;
    int result;

    asm volatile (
        "ldr r0, [%1]
"    // load the first operand into r0
        "ldr r1, [%2]
"    // load the second operand into r1
        "bl fast_multiply
"// call the fast_multiply function
        "mov %0, r0"        // save the result to "result"
        :
        :"r" (result), "r" (&a), "r" (&b)
        :"r0", "r1"         // clobbered registers
    );

    printf("Result: %d
", result);

    return 0;
}

.global fast_multiply
fast_multiply:
    LDR r0, [r0]       // load the first operand into r0
    LDR r1, [r1]       // load the second operand into r1
    MUL r0, r0, r1     // multiply the two operands
    BX  lr             // return the result
  

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GNU Compiler Collection (GCC) – Using the GNU Compiler Collection (GCC), https://gcc.gnu.org/onlinedocs/

ARM Limited – ARM Architecture Reference Manual, https://developer.arm.com/documentation/ddi0487/latest/

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