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utils: use shift instead of division

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We can use a shift for scaling the denominator instead of a divide since the
denom is always positive. This avoids having the compiler generate code for the
different rounding rules when scaling negative values.
This commit is contained in:
Wim Taymans 2009-08-28 15:32:26 +02:00
parent 6cf8948663
commit 378b1e30e7
1 changed files with 4 additions and 2 deletions
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6
gst/gstutils.c
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@ -521,7 +521,7 @@ gst_util_uint64_scale (guint64 val, guint64 num, guint64 denom)
guint64 guint64
gst_util_uint64_scale_round (guint64 val, guint64 num, guint64 denom) gst_util_uint64_scale_round (guint64 val, guint64 num, guint64 denom)
{ {
return _gst_util_uint64_scale (val, num, denom, denom / 2); return _gst_util_uint64_scale (val, num, denom, denom >> 1);
} }
/** /**
@ -622,7 +622,9 @@ gst_util_uint64_scale_int (guint64 val, gint num, gint denom)
guint64 guint64
gst_util_uint64_scale_int_round (guint64 val, gint num, gint denom) gst_util_uint64_scale_int_round (guint64 val, gint num, gint denom)
{ {
return _gst_util_uint64_scale_int (val, num, denom, denom / 2); /* we can use a shift to divide by 2 because denom is required to be
* positive. */
return _gst_util_uint64_scale_int (val, num, denom, denom >> 1);
} }
/** /**