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Reordering comparisons in ecma_compare_ecma_strings to improve performance for frequent cases.

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This commit is contained in:
Ruben Ayrapetyan
2014-11-17 18:36:56 +03:00
parent 34430f0831
commit 8a6eae0ca5
1 changed files with 18 additions and 13 deletions
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src/libecmaobjects/ecma-helpers-string.c
+18 -13
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@@ -919,6 +919,22 @@ ecma_compare_ecma_strings (const ecma_string_t *string1_p, /* ecma-string */
{
JERRY_ASSERT (string1_p != NULL && string2_p != NULL);
if (string1_p->container == string2_p->container)
{
if (likely (string1_p->container == ECMA_STRING_CONTAINER_LIT_TABLE))
{
return (string1_p->u.lit_index == string2_p->u.lit_index);
}
else if (likely (string1_p->container == ECMA_STRING_CONTAINER_MAGIC_STRING))
{
return (string1_p->u.magic_string_id == string2_p->u.magic_string_id);
}
else if (string1_p->container == ECMA_STRING_CONTAINER_UINT32_IN_DESC)
{
return (string1_p->u.uint32_number == string2_p->u.uint32_number);
}
}
if (unlikely (string1_p == string2_p))
{
return true;
@@ -931,11 +947,6 @@ ecma_compare_ecma_strings (const ecma_string_t *string1_p, /* ecma-string */
if (string1_p->container == string2_p->container)
{
if (likely (string1_p->container == ECMA_STRING_CONTAINER_LIT_TABLE))
{
return (string1_p->u.lit_index == string2_p->u.lit_index);
}
switch ((ecma_string_container_t) string1_p->container)
{
case ECMA_STRING_CONTAINER_HEAP_NUMBER:
@@ -964,20 +975,14 @@ ecma_compare_ecma_strings (const ecma_string_t *string1_p, /* ecma-string */
{
return ecma_compare_strings_in_heap_chunks (string1_p, string2_p);
}
case ECMA_STRING_CONTAINER_UINT32_IN_DESC:
{
return (string1_p->u.uint32_number == string2_p->u.uint32_number);
}
case ECMA_STRING_CONTAINER_MAGIC_STRING:
{
return (string1_p->u.magic_string_id == string2_p->u.magic_string_id);
}
case ECMA_STRING_CONTAINER_CONCATENATION:
{
/* long path */
break;
}
case ECMA_STRING_CONTAINER_LIT_TABLE:
case ECMA_STRING_CONTAINER_MAGIC_STRING:
case ECMA_STRING_CONTAINER_UINT32_IN_DESC:
{
JERRY_UNREACHABLE ();
}