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ffmpeg.wasm-core
Commit f06afd69 authored by Michael Niedermayer's avatar Michael Niedermayer
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porting optimizations from 4x4 dct to 8x8 

Originally committed as revision 3515 to svn://svn.ffmpeg.org/ffmpeg/trunk
parent affbf043
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libavcodec/jrevdct.c
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......@@ -235,9 +235,7 @@ void j_rev_dct(DCTBLOCK data)
/* The rotator is sqrt(2)*c(-6). */
{
if (d6) {
if (d4) {
if (d2) {
if (d0) {
/* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX_0_541196100);
tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065);
......@@ -250,21 +248,7 @@ void j_rev_dct(DCTBLOCK data)
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
} else {
/* d0 == 0, d2 != 0, d4 != 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX_0_541196100);
tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065);
tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865);
tmp0 = d4 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp2 - tmp0;
tmp12 = -(tmp0 + tmp2);
}
} else {
if (d0) {
/* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */
tmp2 = MULTIPLY(-d6, FIX_1_306562965);
tmp3 = MULTIPLY(d6, FIX_0_541196100);
......@@ -276,72 +260,9 @@ void j_rev_dct(DCTBLOCK data)
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
} else {
/* d0 == 0, d2 == 0, d4 != 0, d6 != 0 */
tmp2 = MULTIPLY(-d6, FIX_1_306562965);
tmp3 = MULTIPLY(d6, FIX_0_541196100);
tmp0 = d4 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp2 - tmp0;
tmp12 = -(tmp0 + tmp2);
}
}
} else {
if (d2) {
if (d0) {
/* d0 != 0, d2 != 0, d4 == 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX_0_541196100);
tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065);
tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865);
tmp0 = d0 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
} else {
/* d0 == 0, d2 != 0, d4 == 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX_0_541196100);
tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065);
tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865);
tmp10 = tmp3;
tmp13 = -tmp3;
tmp11 = tmp2;
tmp12 = -tmp2;
}
} else {
if (d0) {
/* d0 != 0, d2 == 0, d4 == 0, d6 != 0 */
tmp2 = MULTIPLY(-d6, FIX_1_306562965);
tmp3 = MULTIPLY(d6, FIX_0_541196100);
tmp0 = d0 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
} else {
/* d0 == 0, d2 == 0, d4 == 0, d6 != 0 */
tmp2 = MULTIPLY(-d6, FIX_1_306562965);
tmp3 = MULTIPLY(d6, FIX_0_541196100);
tmp10 = tmp3;
tmp13 = -tmp3;
tmp11 = tmp2;
tmp12 = -tmp2;
}
}
}
} else {
if (d4) {
if (d2) {
if (d0) {
/* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX_0_541196100);
tmp3 = MULTIPLY(d2, FIX_1_306562965);
......@@ -353,62 +274,11 @@ void j_rev_dct(DCTBLOCK data)
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
} else {
/* d0 == 0, d2 != 0, d4 != 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX_0_541196100);
tmp3 = MULTIPLY(d2, FIX_1_306562965);
tmp0 = d4 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp2 - tmp0;
tmp12 = -(tmp0 + tmp2);
}
} else {
if (d0) {
/* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */
tmp10 = tmp13 = (d0 + d4) << CONST_BITS;
tmp11 = tmp12 = (d0 - d4) << CONST_BITS;
} else {
/* d0 == 0, d2 == 0, d4 != 0, d6 == 0 */
tmp10 = tmp13 = d4 << CONST_BITS;
tmp11 = tmp12 = -tmp10;
}
}
} else {
if (d2) {
if (d0) {
/* d0 != 0, d2 != 0, d4 == 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX_0_541196100);
tmp3 = MULTIPLY(d2, FIX_1_306562965);
tmp0 = d0 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
} else {
/* d0 == 0, d2 != 0, d4 == 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX_0_541196100);
tmp3 = MULTIPLY(d2, FIX_1_306562965);
tmp10 = tmp3;
tmp13 = -tmp3;
tmp11 = tmp2;
tmp12 = -tmp2;
}
} else {
if (d0) {
/* d0 != 0, d2 == 0, d4 == 0, d6 == 0 */
tmp10 = tmp13 = tmp11 = tmp12 = d0 << CONST_BITS;
} else {
/* d0 == 0, d2 == 0, d4 == 0, d6 == 0 */
tmp10 = tmp13 = tmp11 = tmp12 = 0;
}
}
}
}
/* Odd part per figure 8; the matrix is unitary and hence its
......@@ -711,9 +581,7 @@ void j_rev_dct(DCTBLOCK data)
/* Even part: reverse the even part of the forward DCT. */
/* The rotator is sqrt(2)*c(-6). */
if (d6) {
if (d4) {
if (d2) {
if (d0) {
/* d0 != 0, d2 != 0, d4 != 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX_0_541196100);
tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065);
......@@ -726,21 +594,7 @@ void j_rev_dct(DCTBLOCK data)
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
} else {
/* d0 == 0, d2 != 0, d4 != 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX_0_541196100);
tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065);
tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865);
tmp0 = d4 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp2 - tmp0;
tmp12 = -(tmp0 + tmp2);
}
} else {
if (d0) {
/* d0 != 0, d2 == 0, d4 != 0, d6 != 0 */
tmp2 = MULTIPLY(-d6, FIX_1_306562965);
tmp3 = MULTIPLY(d6, FIX_0_541196100);
......@@ -752,72 +606,9 @@ void j_rev_dct(DCTBLOCK data)
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
} else {
/* d0 == 0, d2 == 0, d4 != 0, d6 != 0 */
tmp2 = MULTIPLY(-d6, FIX_1_306562965);
tmp3 = MULTIPLY(d6, FIX_0_541196100);
tmp0 = d4 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp2 - tmp0;
tmp12 = -(tmp0 + tmp2);
}
}
} else {
if (d2) {
if (d0) {
/* d0 != 0, d2 != 0, d4 == 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX_0_541196100);
tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065);
tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865);
tmp0 = d0 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
} else {
/* d0 == 0, d2 != 0, d4 == 0, d6 != 0 */
z1 = MULTIPLY(d2 + d6, FIX_0_541196100);
tmp2 = z1 + MULTIPLY(-d6, FIX_1_847759065);
tmp3 = z1 + MULTIPLY(d2, FIX_0_765366865);
tmp10 = tmp3;
tmp13 = -tmp3;
tmp11 = tmp2;
tmp12 = -tmp2;
}
} else {
if (d0) {
/* d0 != 0, d2 == 0, d4 == 0, d6 != 0 */
tmp2 = MULTIPLY(-d6, FIX_1_306562965);
tmp3 = MULTIPLY(d6, FIX_0_541196100);
tmp0 = d0 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
} else {
/* d0 == 0, d2 == 0, d4 == 0, d6 != 0 */
tmp2 = MULTIPLY(-d6, FIX_1_306562965);
tmp3 = MULTIPLY(d6, FIX_0_541196100);
tmp10 = tmp3;
tmp13 = -tmp3;
tmp11 = tmp2;
tmp12 = -tmp2;
}
}
}
} else {
if (d4) {
if (d2) {
if (d0) {
/* d0 != 0, d2 != 0, d4 != 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX_0_541196100);
tmp3 = MULTIPLY(d2, FIX_1_306562965);
......@@ -829,62 +620,11 @@ void j_rev_dct(DCTBLOCK data)
tmp13 = tmp0 - tmp3;
tmp11 = tmp1 + tmp2;
tmp12 = tmp1 - tmp2;
} else {
/* d0 == 0, d2 != 0, d4 != 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX_0_541196100);
tmp3 = MULTIPLY(d2, FIX_1_306562965);
tmp0 = d4 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp2 - tmp0;
tmp12 = -(tmp0 + tmp2);
}
} else {
if (d0) {
/* d0 != 0, d2 == 0, d4 != 0, d6 == 0 */
tmp10 = tmp13 = (d0 + d4) << CONST_BITS;
tmp11 = tmp12 = (d0 - d4) << CONST_BITS;
} else {
/* d0 == 0, d2 == 0, d4 != 0, d6 == 0 */
tmp10 = tmp13 = d4 << CONST_BITS;
tmp11 = tmp12 = -tmp10;
}
}
} else {
if (d2) {
if (d0) {
/* d0 != 0, d2 != 0, d4 == 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX_0_541196100);
tmp3 = MULTIPLY(d2, FIX_1_306562965);
tmp0 = d0 << CONST_BITS;
tmp10 = tmp0 + tmp3;
tmp13 = tmp0 - tmp3;
tmp11 = tmp0 + tmp2;
tmp12 = tmp0 - tmp2;
} else {
/* d0 == 0, d2 != 0, d4 == 0, d6 == 0 */
tmp2 = MULTIPLY(d2, FIX_0_541196100);
tmp3 = MULTIPLY(d2, FIX_1_306562965);
tmp10 = tmp3;
tmp13 = -tmp3;
tmp11 = tmp2;
tmp12 = -tmp2;
}
} else {
if (d0) {
/* d0 != 0, d2 == 0, d4 == 0, d6 == 0 */
tmp10 = tmp13 = tmp11 = tmp12 = d0 << CONST_BITS;
} else {
/* d0 == 0, d2 == 0, d4 == 0, d6 == 0 */
tmp10 = tmp13 = tmp11 = tmp12 = 0;
}
}
}
}
/* Odd part per figure 8; the matrix is unitary and hence its
......
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