INTPROMOTE

Abbreviation	IP
Arguments	None.
Default	INTPROMOTE
Description	The INTPROMOTE directive enables ANSI integer promotion rules. Expressions used in if statements are promoted from smaller types to integer expressions before comparison. This allows Microsoft C and Borland C programs to be ported to C51 with fewer modifications. Because the 8051 is an 8-bit processor, use of the INTPROMOTE directive generates inefficient code in some applications.

See Also: NOINTPROMOTE

Example

#pragma intpromote

The following example demonstrates code generated using INTPROMOTE, and with NOINTPROMOTE.

.
.
.
stmt level	source
   1	char c;
   2	unsigned char  c1,c2;
   3	int  i;
   4
   5	main ()  {
   6    1	 if (c == 0xff) c = 0;	/* never  true  in  C51 V3.40 */
   7    1	 if (c == -1) c = 1;	/* works in both versions */
   8    1	 i = c + 5;
   9    1	 if (c1 < c2 +4) c1 = 0;
  10    1	 }
.
.
.

Code generated by C51 V4 using INTPROMOTE

	; FUNCTION main (BEGIN)
				; SOURCE LINE # 6
0000 AF00		MOV  R7,c
0002 EF		MOV  A,R7
0003 33		RLC  A
0004 95E0		SUBB A,ACC
0006 FE		MOV  R6,A
0007 EF		MOV  A,R7
0008 F4		CPL  A
0009 4E		ORL  A,R6
000A 7002		JNZ  ?C0001
000C F500		MOV  c,A
000E	?C0001:
				; SOURCE LINE # 7
000E E500		MOV  A,c
0010 B4FF03		CJNE A,#0FFH,?C0002
0013 750001		MOV  c,#01H
0016	?C0002:
				; SOURCE LINE # 8
0016 AF00		MOV  R7,c
0018 EF		MOV  A,R7
0019 33		RLC  A
001A 95E0		SUBB A,ACC
001C FE		MOV  R6,A
001D EF		MOV  A,R7
001E 2405		ADD  A,#05H
0020 F500		MOV  i+01H,A
0022 E4		CLR  A
0023 3E		ADDC A,R6
0024 F500		MOV  i,A
				; SOURCE LINE # 9
0026 E500		MOV  A,c2
0028 2404		ADD  A,#04H
002A FF		MOV  R7,A
002B E4		CLR  A
002C 33		RLC  A
002D FE		MOV  R6,A
002E C3		CLR  C
002F E500		MOV  A,c1
0031 9F		SUBB A,R7
0032 EE		MOV  A,R6
0033 6480		XRL  A,#080H
0035 F8		MOV  R0,A
0036 7480		MOV  A,#080H
0038 98		SUBB A,R0
0039 5003		JNC  ?C0004
003B E4		CLR  A
003C F500		MOV  c1,A
				; SOURCE LINE # 10
003E	?C0004:
003E 22		RET
	; FUNCTION main (END)

CODE SIZE = 63 Bytes

Code generated by C51 V4 using NOINTPROMOTE

	; FUNCTION main (BEGIN)
				; SOURCE LINE # 6
0000 AF00		MOV  R7,c
0002 EF		MOV  A,R7
0003 33		RLC  A
0004 95E0		SUBB A,ACC
0006 FE		MOV  R6,A
0007 EF		MOV  A,R7
0008 F4		CPL  A
0009 4E		ORL  A,R6
000A 7002		JNZ  ?C0001
000C F500		MOV  c,A
000E	?C0001:
				; SOURCE LINE # 7
000E E500		MOV  A,c
0010 B4FF03		CJNE A,#0FFH,?C0002
0013 750001		MOV  c,#01H
0016	?C0002:
				; SOURCE LINE # 8
0016 E500		MOV  A,c
0018 2405		ADD  A,#05H
001A FF		MOV  R7,A
001B 33		RLC  A
001C 95E0		SUBB A,ACC
001E F500		MOV  i,A
0020 8F00		MOV  i+01H,R7
				; SOURCE LINE # 9
0022 E500		MOV  A,c2
0024 2404		ADD  A,#04H
0026 FF		MOV  R7,A
0027 E500		MOV  A,c1
0029 C3		CLR  C
002A 9F		SUBB A,R7
002B 5003		JNC  ?C0004
002D E4		CLR  A
002E F500		MOV  c1,A
				; SOURCE LINE # 10
0030	?C0004:
0030 22		RET
	; FUNCTION main (END)