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top: remove GCCisms

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function                                             old     new   delta
display_process_list                                1447    1448      +1

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2009-09-12 15:11:50 +02:00
parent 27726cb6aa
commit fe73798135
1 changed files with 12 additions and 5 deletions
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17
procps/top.c
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@ -348,13 +348,15 @@ static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
unsigned total_diff;
jiffy_counts_t *p_jif, *p_prev_jif;
int i;
# if ENABLE_FEATURE_TOP_SMP_CPU
int n_cpu_lines;
# endif
/* using (unsigned) casts to make operations cheaper */
# define CALC_TOT_DIFF ((unsigned)(p_jif->total - p_prev_jif->total) ? : 1)
# define CALC_TOTAL_DIFF do { \
total_diff = (unsigned)(p_jif->total - p_prev_jif->total); \
if (total_diff == 0) total_diff = 1; \
} while (0)
# if ENABLE_FEATURE_TOP_DECIMALS
# define CALC_STAT(xxx) char xxx[8]
@ -381,7 +383,7 @@ static void display_cpus(int scr_width, char *scrbuf, int *lines_rem_p)
p_jif = &cpu_jif[i];
p_prev_jif = &cpu_prev_jif[i];
# endif
total_diff = CALC_TOT_DIFF;
CALC_TOTAL_DIFF;
{ /* Need a block: CALC_STAT are declarations */
CALC_STAT(usr);
@ -511,6 +513,7 @@ static NOINLINE void display_process_list(int lines_rem, int scr_width)
/* xxx_shift and xxx_scale variables allow us to replace
* expensive divides with multiply and shift */
unsigned pmem_shift, pmem_scale, pmem_half;
unsigned tmp_unsigned;
#if ENABLE_FEATURE_TOP_CPU_USAGE_PERCENTAGE
unsigned pcpu_shift, pcpu_scale, pcpu_half;
unsigned busy_jifs;
@ -565,12 +568,16 @@ static NOINLINE void display_process_list(int lines_rem, int scr_width)
* we assume that unsigned is at least 32-bit.
*/
pcpu_shift = 6;
pcpu_scale = (UPSCALE*64 * (uint16_t)busy_jifs ? : 1);
pcpu_scale = UPSCALE*64 * (uint16_t)busy_jifs;
if (pcpu_scale == 0)
pcpu_scale = 1;
while (pcpu_scale < (1U << (BITS_PER_INT-2))) {
pcpu_scale *= 4;
pcpu_shift += 2;
}
pcpu_scale /= ( (uint16_t)(cur_jif.total - prev_jif.total) * total_pcpu ? : 1);
tmp_unsigned = (uint16_t)(cur_jif.total - prev_jif.total) * total_pcpu;
if (tmp_unsigned != 0)
pcpu_scale /= tmp_unsigned;
/* we want (s->pcpu * pcpu_scale) to never overflow */
while (pcpu_scale >= 1024) {
pcpu_scale /= 4;