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Four byte optimized memcpy.

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JerryScript-DCO-1.0-Signed-off-by: Zoltan Herczeg zherczeg.u-szeged@partner.samsung.com
This commit is contained in:
Zoltan Herczeg 2016-06-22 03:15:04 -07:00
parent 1726bba184
commit 64f49385ae
1 changed files with 18 additions and 0 deletions
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18
jerry-libc/jerry-libc.c
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@ -103,6 +103,24 @@ memcpy (void *s1, /**< destination */
const void *s2, /**< source */
size_t n) /**< bytes number */
{
/* Aligned fast case. */
if (n >= 4 && !(((uintptr_t) s1) & 0x3) && !(((uintptr_t) s2) & 0x3))
{
size_t chunks = (n >> 2);
uint32_t *area1_p = (uint32_t *) s1;
const uint32_t *area2_p = (const uint32_t *) s2;
do
{
*area1_p++ = *area2_p++;
}
while (--chunks);
n &= 0x3;
s1 = area1_p;
s2 = area2_p;
}
uint8_t *area1_p = (uint8_t *) s1;
const uint8_t *area2_p = (const uint8_t *) s2;