shithub: libvpx

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ref: f5325048642e77d0a85836c9472576c7e299d167
parent: ecd1eb216224d3eee9ec060557e9677827dff1db
author: Linfeng Zhang <[email protected]>
date: Tue May 9 07:05:51 EDT 2017 

Clean 32x32 idct C code

Change-Id: I73b8104a9e7a70ffe827c1b7ff43618f24f5d7bd


--- a/vpx_dsp/inv_txfm.c
+++ b/vpx_dsp/inv_txfm.c
@@ -1182,16 +1182,10 @@
 
   // Rows
   for (i = 0; i < 32; ++i) {
-    int16_t zero_coeff[16];
-    for (j = 0; j < 16; ++j) zero_coeff[j] = input[2 * j] | input[2 * j + 1];
-    for (j = 0; j < 8; ++j)
-      zero_coeff[j] = zero_coeff[2 * j] | zero_coeff[2 * j + 1];
-    for (j = 0; j < 4; ++j)
-      zero_coeff[j] = zero_coeff[2 * j] | zero_coeff[2 * j + 1];
-    for (j = 0; j < 2; ++j)
-      zero_coeff[j] = zero_coeff[2 * j] | zero_coeff[2 * j + 1];
+    int16_t zero_coeff = 0;
+    for (j = 0; j < 32; ++j) zero_coeff |= input[j];
 
-    if (zero_coeff[0] | zero_coeff[1])
+    if (zero_coeff)
       idct32_c(input, outptr);
     else
       memset(outptr, 0, sizeof(tran_low_t) * 32);
@@ -2529,16 +2523,10 @@
 
   // Rows
   for (i = 0; i < 32; ++i) {
-    tran_low_t zero_coeff[16];
-    for (j = 0; j < 16; ++j) zero_coeff[j] = input[2 * j] | input[2 * j + 1];
-    for (j = 0; j < 8; ++j)
-      zero_coeff[j] = zero_coeff[2 * j] | zero_coeff[2 * j + 1];
-    for (j = 0; j < 4; ++j)
-      zero_coeff[j] = zero_coeff[2 * j] | zero_coeff[2 * j + 1];
-    for (j = 0; j < 2; ++j)
-      zero_coeff[j] = zero_coeff[2 * j] | zero_coeff[2 * j + 1];
+    tran_low_t zero_coeff = 0;
+    for (j = 0; j < 32; ++j) zero_coeff |= input[j];
 
-    if (zero_coeff[0] | zero_coeff[1])
+    if (zero_coeff)
       highbd_idct32_c(input, outptr, bd);
     else
       memset(outptr, 0, sizeof(tran_low_t) * 32);