to size boundary of the structure alignment

Hi Ras,

it would be possible if the structure size is a positive power of 2.

For example, the code

struct struct1 {

 int i[10];// 40 bytes

 char c[24];// 24 bytes

};

struct struct1 __attribute__ ((aligned(sizeof(struct struct1)))) ic;

int main()

{

 ic.i[0]=0x12345678;

 ic.c[1]=0x5a;

 return 0;

}

would be compiled as the followings.

          .text
        .align  2
        .global main
        .thumb
        .thumb_func
        .type   main, %function
main:
        ldr     r3, .L2
        ldr     r2, .L2+4
        str     r2, [r3]
        movs    r2, #90
        strb    r2, [r3, #41]
        movs    r0, #0
        bx      lr
.L3:
        .align  2
.L2:
        .word   ic
        .word   305419896
        .size   main, .-main
        .comm   ic,64,64

Is this your intention?

Best regards,

Yasuhiko Koumoto.

Hi Ras,

it would be possible if the structure size is a positive power of 2.

For example, the code

struct struct1 {

 int i[10];// 40 bytes

 char c[24];// 24 bytes

};

struct struct1 __attribute__ ((aligned(sizeof(struct struct1)))) ic;

int main()

{

 ic.i[0]=0x12345678;

 ic.c[1]=0x5a;

 return 0;

}

would be compiled as the followings.

          .text
        .align  2
        .global main
        .thumb
        .thumb_func
        .type   main, %function
main:
        ldr     r3, .L2
        ldr     r2, .L2+4
        str     r2, [r3]
        movs    r2, #90
        strb    r2, [r3, #41]
        movs    r0, #0
        bx      lr
.L3:
        .align  2
.L2:
        .word   ic
        .word   305419896
        .size   main, .-main
        .comm   ic,64,64

Is this your intention?

Best regards,

Yasuhiko Koumoto.