As you might expect, the shorter C programs generally produced less generated code.

	UC r,i=7;DO{r=r*2|c&1;c/=2;}WH(--i);RT r;

compiles to

C:0x0003    7D07     MOV      R5,#0x07
C:0x0005    EF       MOV      A,R7
C:0x0006    5401     ANL      A,#0x01
C:0x0008    FC       MOV      R4,A
C:0x0009    EE       MOV      A,R6
C:0x000A    25E0     ADD      A,ACC(0xE0)
C:0x000C    4C       ORL      A,R4
C:0x000D    FE       MOV      R6,A
C:0x000E    EF       MOV      A,R7
C:0x000F    C3       CLR      C
C:0x0010    13       RRC      A
C:0x0011    FF       MOV      R7,A
C:0x0012    DDF1     DJNZ     R5,C:0005
C:0x0014    AF06     MOV      R7,0x06
C:0x0016    22       RET