Microsoft Visual C/C++ (VS2008) compiler output using -O1 (optimize for code size) switch, x86 target:

Non-inline functions:

_TEXT	SEGMENT
_inc32i	PROC						; COMDAT

; 43   :     pl[0] += 1;

  00000	ff 05 00 00 00
	00		 inc	 DWORD PTR _rgl

; 44   :     pl[1] += 1;

  00006	ff 05 04 00 00
	00		 inc	 DWORD PTR _rgl+4

; 45   : }

  0000c	c3		 ret	 0
_inc32i	ENDP
; Function compile flags: /Ogspy
_TEXT	ENDS
;	COMDAT _inc64i
_TEXT	SEGMENT
_inc64i	PROC						; COMDAT

; 31   :     pq[0] += 1;

  00000	83 05 00 00 00
	00 01		 add	 DWORD PTR _rgq, 1
  00007	83 15 04 00 00
	00 00		 adc	 DWORD PTR _rgq+4, 0

; 32   :     pq[1] += 1;

  0000e	83 05 08 00 00
	00 01		 add	 DWORD PTR _rgq+8, 1
  00015	83 15 0c 00 00
	00 00		 adc	 DWORD PTR _rgq+12, 0

; 33   : }

  0001c	c3		 ret	 0
_inc64i	ENDP


Inlined loop:

; 63   :     {
; 64   :         inc32i(&rgl[0]);

  00005	ff 05 00 00 00
	00		 inc	 DWORD PTR _rgl
  0000b	ff 05 04 00 00
	00		 inc	 DWORD PTR _rgl+4

; 65   :         inc64i(&rgq[0]);

  00011	83 05 00 00 00
	00 01		 add	 DWORD PTR _rgq, 1
  00018	83 15 04 00 00
	00 00		 adc	 DWORD PTR _rgq+4, 0
  0001f	83 05 08 00 00
	00 01		 add	 DWORD PTR _rgq+8, 1
  00026	83 15 0c 00 00
	00 00		 adc	 DWORD PTR _rgq+12, 0