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Code Issues Releases Activity

Move vars declaration to inner loop when possible

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Originally committed as revision 14066 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Vitor Sessak 2008-07-04 15:37:52 +00:00
parent 12ea267bca
commit 69c23e6f33
1 changed files with 9 additions and 12 deletions
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21
libavcodec/ra288.c
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@ -41,16 +41,14 @@ typedef struct {
static void decode(Real288_internal *glob, float gain, int cb_coef)
{
unsigned int x, y;
float f;
double sum, sumsum;
float *p1, *p2;
float buffer[5];
for (x=36; x--; glob->sb[x+5] = glob->sb[x]);
for (x=5; x--;) {
p1 = glob->sb+x;
p2 = glob->pr1;
float *p1 = glob->sb+x;
float *p2 = glob->pr1;
for (sum=0, y=36; y--; sum -= (*(++p1))*(*(p2++)));
glob->sb[x] = sum;
@ -84,7 +82,7 @@ static void decode(Real288_internal *glob, float gain, int cb_coef)
/* output */
for (x=0; x < 5; x++) {
f = glob->sb[4-x] + buffer[x];
float f = glob->sb[4-x] + buffer[x];
if (f > 4095)
f = 4095;
@ -105,9 +103,7 @@ static void colmult(float *tgt, float *m1, const float *m2, int n)
static int pred(float *in, float *tgt, int n)
{
int x, y;
float *p1, *p2;
double f0, f1, f2;
float temp;
if (in[n] == 0)
return 0;
@ -116,11 +112,12 @@ static int pred(float *in, float *tgt, int n)
return 0;
for (x=1 ; ; x++) {
float *p1 = in + x;
float *p2 = tgt;
if (n < x)
return 1;
p1 = in + x;
p2 = tgt;
f1 = *(p1--);
for (y=x; --y; f1 += (*(p1--))*(*(p2++)));
@ -128,7 +125,7 @@ static int pred(float *in, float *tgt, int n)
p2 = tgt;
*(p1--) = f2 = -f1/f0;
for (y=x >> 1; y--;) {
temp = *p2 + *p1 * f2;
float temp = *p2 + *p1 * f2;
*(p1--) += *p2 * f2;
*(p2++) = temp;
}
@ -141,11 +138,11 @@ static int pred(float *in, float *tgt, int n)
static void prodsum(float *tgt, float *src, int len, int n)
{
unsigned int x;
float *p1, *p2;
double sum;
while (n >= 0) {
p1 = (p2 = src) - n;
float *p2 = src;
float *p1 = p2 - n;
for (sum=0, x=len; x--; sum += (*p1++) * (*p2++));
tgt[n--] = sum;
}