Before:

0x2000078c <RCC_ADCCLKConfig>:    push  {r7}
0x2000078e <RCC_ADCCLKConfig+2>:  sub   sp, #20
0x20000790 <RCC_ADCCLKConfig+4>:  add   r7, sp, #0
0x20000792 <RCC_ADCCLKConfig+6>:  str   r0, [r7, #4]
0x20000794 <RCC_ADCCLKConfig+8>:  mov.w r3, #0  ; 0x0
0x20000798 <RCC_ADCCLKConfig+12>: str   r3, [r7, #12]
0x2000079a <RCC_ADCCLKConfig+14>: movw  r3, #4096  ; 0x1000
0x2000079e <RCC_ADCCLKConfig+18>: movt  r3, #16386  ; 0x4002
0x200007a2 <RCC_ADCCLKConfig+22>: ldr   r3, [r3, #4]
0x200007a4 <RCC_ADCCLKConfig+24>: str   r3, [r7, #12]
0x200007a6 <RCC_ADCCLKConfig+26>: ldr   r3, [r7, #12]
0x200007a8 <RCC_ADCCLKConfig+28>: bic.w r3, r3, #49152  ; 0xc000
0x200007ac <RCC_ADCCLKConfig+32>: str   r3, [r7, #12]
0x200007ae <RCC_ADCCLKConfig+34>: ldr   r2, [r7, #12]
0x200007b0 <RCC_ADCCLKConfig+36>: ldr   r3, [r7, #4]
0x200007b2 <RCC_ADCCLKConfig+38>: orr.w r3, r2, r3
0x200007b6 <RCC_ADCCLKConfig+42>: str   r3, [r7, #12]
0x200007b8 <RCC_ADCCLKConfig+44>: movw  r3, #4096  ; 0x1000
0x200007bc <RCC_ADCCLKConfig+48>: movt  r3, #16386  ; 0x4002
0x200007c0 <RCC_ADCCLKConfig+52>: ldr   r2, [r7, #12]
0x200007c2 <RCC_ADCCLKConfig+54>: str   r2, [r3, #4]
0x200007c4 <RCC_ADCCLKConfig+56>: add.w r7, r7, #20  ; 0x14
0x200007c8 <RCC_ADCCLKConfig+60>: mov   sp, r7
0x200007ca <RCC_ADCCLKConfig+62>: pop   {r7}
0x200007cc <RCC_ADCCLKConfig+64>: bx    lr


After (added "i=10;" somwhere in the main):

0x2000079c <RCC_ADCCLKConfig>:    push  {r7}
0x2000079e <RCC_ADCCLKConfig+2>:  sub   sp, #20
0x200007a0 <RCC_ADCCLKConfig+4>:  add   r7, sp, #0
0x200007a2 <RCC_ADCCLKConfig+6>:  str   r0, [r7, #4]
0x200007a4 <RCC_ADCCLKConfig+8>:  mov.w r3, #0  ; 0x0
0x200007a8 <RCC_ADCCLKConfig+12>: str   r3, [r7, #12]
0x200007aa <RCC_ADCCLKConfig+14>: movw  r3, #4096  ; 0x1000
0x200007ae <RCC_ADCCLKConfig+18>: movt  r3, #16386  ; 0x4002
0x200007b2 <RCC_ADCCLKConfig+22>: ldr   r3, [r3, #4]
0x200007b4 <RCC_ADCCLKConfig+24>: str   r3, [r7, #12]
0x200007b6 <RCC_ADCCLKConfig+26>: ldr   r3, [r7, #12]
0x200007b8 <RCC_ADCCLKConfig+28>: bic.w r3, r3, #49152  ; 0xc000
0x200007bc <RCC_ADCCLKConfig+32>: str   r3, [r7, #12]
0x200007be <RCC_ADCCLKConfig+34>: ldr   r2, [r7, #12]
0x200007c0 <RCC_ADCCLKConfig+36>: ldr   r3, [r7, #4]
0x200007c2 <RCC_ADCCLKConfig+38>: orr.w r3, r2, r3
0x200007c6 <RCC_ADCCLKConfig+42>: str   r3, [r7, #12]
0x200007c8 <RCC_ADCCLKConfig+44>: movw  r3, #4096  ; 0x1000
0x200007cc <RCC_ADCCLKConfig+48>: movt  r3, #16386  ; 0x4002
0x200007d0 <RCC_ADCCLKConfig+52>: ldr   r2, [r7, #12]
0x200007d2 <RCC_ADCCLKConfig+54>: str   r2, [r3, #4]
0x200007d4 <RCC_ADCCLKConfig+56>: add.w r9, r7, #336860180  ;0x14141414
0x200007d8 <RCC_ADCCLKConfig+60>: lsls  r0, r0, #0
0x200007da <RCC_ADCCLKConfig+62>: lsls  r4, r3, #0
0x200007dc <RCC_ADCCLKConfig+64>: lsls  r1, r3, #0