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driver: arcv2_timer0: optimze the code

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use a local variable to replace the ctrl_cache

Signed-off-by: Wayne Ren <wei.ren@synopsys.com>
This commit is contained in:
Wayne Ren 2018-12-06 14:58:12 +08:00 • committed by Anas Nashif
commit f8022b2630
1 changed files with 3 additions and 4 deletions
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7
drivers/timer/arcv2_timer0.c
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@ -39,7 +39,6 @@ static u32_t last_load;
static u32_t cycle_count;
static volatile u32_t ctrl_cache; /* overflow bit clears on read! */
/**
*
@ -109,14 +108,14 @@ static ALWAYS_INLINE void timer0_limit_register_set(u32_t count)
static u32_t elapsed(void)
{
u32_t val, ov;
u32_t val, ov, ctrl;
do {
val = timer0_count_register_get();
ctrl_cache = timer0_control_register_get();
ctrl = timer0_control_register_get();
} while (timer0_count_register_get() < val);
ov = (ctrl_cache & _ARC_V2_TMR_CTRL_IP) ? last_load : 0;
ov = (ctrl & _ARC_V2_TMR_CTRL_IP) ? last_load : 0;
return val + ov;
}