Removed recursion. Also reduced few if() checks.
Cc: Hans Verkuil <[email protected]>
Cc: Antti Palosaari <[email protected]>
Signed-off-by: Prashant Laddha <[email protected]>
---
drivers/media/platform/vivid/vivid-sin.c | 28 +++++++++++++---------------
1 file changed, 13 insertions(+), 15 deletions(-)
diff --git a/drivers/media/platform/vivid/vivid-sin.c
b/drivers/media/platform/vivid/vivid-sin.c
index 2ed9f7f..c9face9 100644
--- a/drivers/media/platform/vivid/vivid-sin.c
+++ b/drivers/media/platform/vivid/vivid-sin.c
@@ -36,25 +36,23 @@ static s32 sin[65] = {
static s32 get_sin_val(u32 index)
{
+ s32 sign = 1;
u32 tab_index;
u32 new_index;
- if (index <= 64)
- return sin[index];
- else if (index > 64 && index <= 128) {
- tab_index = 64 - (index - 64);
- return sin[tab_index];
- } else if (index > 128 && index <= 192) {
- tab_index = index - 128;
- return (-1) * sin[tab_index];
- } else if (index > 192 && index <= 255) {
- tab_index = 64 - (index - 192);
- return (-1) * sin[tab_index];
- }
-
- new_index = index % 256;
- return get_sin_val(new_index);
+ new_index = index & 0xFF; /* new_index = index % 256*/
+ if (new_index > 128)
+ sign = -1;
+
+ new_index = index & 0x7F; /* new_index = index % 256*/
+
+ if (new_index <= 64)
+ tab_index = new_index;
+ else
+ tab_index = 64 - (new_index - 64);
+
+ return sign * sin[tab_index];
}
/*
--
1.9.1
--
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