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diff: debug macros; one trivial size optimization

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function                                             old     new   delta
diffreg                                             1781    1815     +34
isqrt                                                 64       -     -64
------------------------------------------------------------------------------
(add/remove: 0/1 grow/shrink: 1/0 up/down: 34/-64)            Total: -30 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-09-21 01:23:19 +02:00
parent 3e02050314
commit d8dd25a2a7
1 changed files with 16 additions and 4 deletions
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20
editors/diff.c
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@ -14,6 +14,9 @@
#include "libbb.h"
#define dbg_error_msg(...) ((void)0)
//#define dbg_error_msg(...) bb_error_msg(__VA_ARGS__)
// #define FSIZE_MAX 32768
/* NOINLINEs added to prevent gcc from merging too much into diffreg()
@ -474,12 +477,13 @@ static int stone(int *a, int n, int *b, int *c)
{
int i, k, y, j, l;
int oldc, tc, oldl;
unsigned int numtries;
unsigned numtries;
int isq = isqrt(n);
#if ENABLE_FEATURE_DIFF_MINIMAL
const unsigned int bound =
(option_mask32 & FLAG_d) ? UINT_MAX : MAX(256, isqrt(n));
const unsigned bound =
(option_mask32 & FLAG_d) ? UINT_MAX : MAX(256, isq);
#else
const unsigned int bound = MAX(256, isqrt(n));
const unsigned bound = MAX(256, isq);
#endif
k = 0;
@ -769,6 +773,8 @@ static void dump_unified_vec(FILE *f1, FILE *f2)
if (context_idx < 0)
return;
dbg_error_msg("dumping %d context_vecs", context_idx+1);
b = d = 0; /* gcc */
lowa = MAX(1, cvp->a - opt_U_context);
upb = MIN(nlen[0], context_vector[context_idx].b + opt_U_context);
@ -860,6 +866,10 @@ static void change(const char *file1, FILE *f1, const char *file2, FILE *f2,
int a, int b, int c, int d)
{
if ((a > b && c > d) || (option_mask32 & FLAG_q)) {
//compat BUG: "diff -ub F1 F2" will output nothing, but will exit 1
//if F1 and F2 differ only in whitespace. "standard" diff exits 0.
//This is the place where this erroneous exitcode is set:
dbg_error_msg("%d: abcd:%d,%d,%d,%d, anychange=1", __LINE__, a,b,c,d);
anychange = 1;
return;
}
@ -885,6 +895,7 @@ static void change(const char *file1, FILE *f1, const char *file2, FILE *f2,
context_vector[context_idx].b = b;
context_vector[context_idx].c = c;
context_vector[context_idx].d = d;
dbg_error_msg("new context_vec[%d]:%d,%d,%d,%d", context_idx, a,b,c,d);
anychange = 1;
}
@ -1074,6 +1085,7 @@ static unsigned diffreg(const char *file1, const char *file2, int flags)
closem:
if (anychange) {
exit_status |= 1;
dbg_error_msg("exit_status|=1 = %d", exit_status);
if (rval == D_SAME)
rval = D_DIFFER;
}