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lib/vsprintf.c: another small hack

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Making ZEROPAD == '0'-' ', we can eliminate a few more instructions.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Rasmus Villemoes 2015-04-15 16:17:11 -07:00 • committed by Linus Torvalds
parent 3ea8d440a8
commit d1c1b12137
1 changed files with 4 additions and 3 deletions
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7
lib/vsprintf.c
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@ -341,10 +341,10 @@ int num_to_str(char *buf, int size, unsigned long long num)
} }
#define SIGN 1 /* unsigned/signed, must be 1 */ #define SIGN 1 /* unsigned/signed, must be 1 */
#define ZEROPAD 2 /* pad with zero */ #define LEFT 2 /* left justified */
#define PLUS 4 /* show plus */ #define PLUS 4 /* show plus */
#define SPACE 8 /* space if plus */ #define SPACE 8 /* space if plus */
#define LEFT 16 /* left justified */ #define ZEROPAD 16 /* pad with zero, must be 16 == '0' - ' ' */
#define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */ #define SMALL 32 /* use lowercase in hex (must be 32 == 0x20) */
#define SPECIAL 64 /* prefix hex with "0x", octal with "0" */ #define SPECIAL 64 /* prefix hex with "0x", octal with "0" */
@ -467,7 +467,8 @@ char *number(char *buf, char *end, unsigned long long num,
} }
/* zero or space padding */ /* zero or space padding */
if (!(spec.flags & LEFT)) { if (!(spec.flags & LEFT)) {
char c = (spec.flags & ZEROPAD) ? '0' : ' '; char c = ' ' + (spec.flags & ZEROPAD);
BUILD_BUG_ON(' ' + ZEROPAD != '0');
while (--spec.field_width >= 0) { while (--spec.field_width >= 0) {
if (buf < end) if (buf < end)
*buf = c; *buf = c;