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gstvalue: Avoid expensive fallback on intersection

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The type checks at the end of `gst_value_intersect` to call the flagset
intersection are relatively expensive.

If we already know that:
* There was a compare function but it didn't return GST_VALUE_EQUAL
* AND none of the registered intersect functions failed

Then we know they can't intersect and can return early.

Trims ~20% of the instruction calls
This commit is contained in:
Edward Hervey 2020-03-19 11:20:14 +01:00 committed by Edward Hervey
parent 34b6929a0f
commit cd751c2de3
1 changed files with 21 additions and 4 deletions
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25
gst/gstvalue.c
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@ -5783,17 +5783,28 @@ gst_value_list_equals_range (const GValue * list, const GValue * value)
/* "Pure" variant of gst_value_compare which is guaranteed to
* not have list arguments and therefore does basic comparisons
*
* Handled will be set to TRUE if there is a valid compared function
* regardless of whether the two values are equal or not. This is
* useful to know whether this function returned !EQUAL because the
* values are compatible but didn't match or because there wasn't
* a valid comparision function.
*/
static inline gint
_gst_value_compare_nolist (const GValue * value1, const GValue * value2)
_gst_value_compare_nolist (const GValue * value1, const GValue * value2,
gboolean * handled)
{
GstValueCompareFunc compare;
if (handled)
*handled = FALSE;
if (G_VALUE_TYPE (value1) != G_VALUE_TYPE (value2))
return GST_VALUE_UNORDERED;
compare = gst_value_get_compare_func (value1);
if (compare) {
if (handled)
*handled = TRUE;
return compare (value1, value2);
}
@ -5878,7 +5889,7 @@ gst_value_compare (const GValue * value1, const GValue * value2)
}
/* And now handle the generic case */
return _gst_value_compare_nolist (value1, value2);
return _gst_value_compare_nolist (value1, value2, NULL);
}
/*
@ -6097,6 +6108,7 @@ gst_value_intersect (GValue * dest, const GValue * value1,
GstValueIntersectInfo *intersect_info;
guint i, len;
GType type1, type2;
gboolean handled;
g_return_val_if_fail (G_IS_VALUE (value1), FALSE);
g_return_val_if_fail (G_IS_VALUE (value2), FALSE);
@ -6110,7 +6122,7 @@ gst_value_intersect (GValue * dest, const GValue * value1,
if (type2 == GST_TYPE_LIST)
return gst_value_intersect_list (dest, value2, value1);
if (_gst_value_compare_nolist (value1, value2) == GST_VALUE_EQUAL) {
if (_gst_value_compare_nolist (value1, value2, &handled) == GST_VALUE_EQUAL) {
if (dest)
gst_value_init_and_copy (dest, value1);
return TRUE;
@ -6128,6 +6140,11 @@ gst_value_intersect (GValue * dest, const GValue * value1,
}
}
/* If there was a comparision that failed and it doesnt' have an
* intersect function then it definitely can't intersect */
if (handled)
return FALSE;
/* Failed to find a direct intersection, check if these are
* GstFlagSet sub-types. */
if (G_UNLIKELY (GST_VALUE_HOLDS_FLAG_SET (value1) &&
@ -6211,7 +6228,7 @@ gst_value_subtract (GValue * dest, const GValue * minuend,
}
}
if (_gst_value_compare_nolist (minuend, subtrahend) != GST_VALUE_EQUAL) {
if (_gst_value_compare_nolist (minuend, subtrahend, NULL) != GST_VALUE_EQUAL) {
if (dest)
gst_value_init_and_copy (dest, minuend);
return TRUE;