Remove useless intermediate var

[ffmpeg] / libavcodec / faandct.c

diff --git a/libavcodec/faandct.c b/libavcodec/faandct.c
index e472afaffbb1dec59ff80d3e47c71e4feea553fa..d82c308400ed4e3fc2f356781d33d60c0abc497e 100644 (file)
--- a/libavcodec/faandct.c
+++ b/libavcodec/faandct.c
@@ -77,7 +77,8 @@ static av_always_inline void row_fdct(FLOAT temp[64], DCTELEM * data)
 {
     FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
     FLOAT tmp10, tmp11, tmp12, tmp13;
-    FLOAT z1, z2, z3, z4, z5, z11, z13;
+    FLOAT z2, z4, z11, z13;
+    FLOAT av_unused z5;
     int i;
 
     for (i=0; i<8*8; i+=8) {
@@ -98,21 +99,27 @@ static av_always_inline void row_fdct(FLOAT temp[64], DCTELEM * data)
         temp[0 + i]= tmp10 + tmp11;
         temp[4 + i]= tmp10 - tmp11;
 
-        z1= (tmp12 + tmp13)*A1;
-        temp[2 + i]= tmp13 + z1;
-        temp[6 + i]= tmp13 - z1;
+        tmp12 += tmp13;
+        tmp12 *= A1;
+        temp[2 + i]= tmp13 + tmp12;
+        temp[6 + i]= tmp13 - tmp12;
 
-        tmp10= tmp4 + tmp5;
-        tmp11= tmp5 + tmp6;
-        tmp12= tmp6 + tmp7;
+        tmp4 += tmp5;
+        tmp5 += tmp6;
+        tmp6 += tmp7;
 
-        z5= (tmp10 - tmp12) * A5;
-        z2= tmp10*A2 + z5;
-        z4= tmp12*A4 + z5;
-        z3= tmp11*A1;
+#if 0
+        z5= (tmp4 - tmp6) * A5;
+        z2= tmp4*A2 + z5;
+        z4= tmp6*A4 + z5;
+#else
+        z2= tmp4*(A2+A5) - tmp6*A5;
+        z4= tmp6*(A4-A5) + tmp4*A5;
+#endif
+        tmp5*=A1;
 
-        z11= tmp7 + z3;
-        z13= tmp7 - z3;
+        z11= tmp7 + tmp5;
+        z13= tmp7 - tmp5;
 
         temp[5 + i]= z13 + z2;
         temp[3 + i]= z13 - z2;
@@ -125,7 +132,8 @@ void ff_faandct(DCTELEM * data)
 {
     FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
     FLOAT tmp10, tmp11, tmp12, tmp13;
-    FLOAT z1, z2, z3, z4, z5, z11, z13;
+    FLOAT z2, z4, z11, z13;
+    FLOAT av_unused z5;
     FLOAT temp[64];
     int i;
 
@@ -151,21 +159,27 @@ void ff_faandct(DCTELEM * data)
         data[8*0 + i]= lrintf(SCALE(8*0 + i) * (tmp10 + tmp11));
         data[8*4 + i]= lrintf(SCALE(8*4 + i) * (tmp10 - tmp11));
 
-        z1= (tmp12 + tmp13)* A1;
-        data[8*2 + i]= lrintf(SCALE(8*2 + i) * (tmp13 + z1));
-        data[8*6 + i]= lrintf(SCALE(8*6 + i) * (tmp13 - z1));
+        tmp12 += tmp13;
+        tmp12 *= A1;
+        data[8*2 + i]= lrintf(SCALE(8*2 + i) * (tmp13 + tmp12));
+        data[8*6 + i]= lrintf(SCALE(8*6 + i) * (tmp13 - tmp12));
 
-        tmp10= tmp4 + tmp5;
-        tmp11= tmp5 + tmp6;
-        tmp12= tmp6 + tmp7;
+        tmp4 += tmp5;
+        tmp5 += tmp6;
+        tmp6 += tmp7;
 
-        z5= (tmp10 - tmp12) * A5;
-        z2= tmp10*A2 + z5;
-        z4= tmp12*A4 + z5;
-        z3= tmp11*A1;
+#if 0
+        z5= (tmp4 - tmp6) * A5;
+        z2= tmp4*A2 + z5;
+        z4= tmp6*A4 + z5;
+#else
+        z2= tmp4*(A2+A5) - tmp6*A5;
+        z4= tmp6*(A4-A5) + tmp4*A5;
+#endif
+        tmp5*=A1;
 
-        z11= tmp7 + z3;
-        z13= tmp7 - z3;
+        z11= tmp7 + tmp5;
+        z13= tmp7 - tmp5;
 
         data[8*5 + i]= lrintf(SCALE(8*5 + i) * (z13 + z2));
         data[8*3 + i]= lrintf(SCALE(8*3 + i) * (z13 - z2));
@@ -178,7 +192,6 @@ void ff_faandct248(DCTELEM * data)
 {
     FLOAT tmp0, tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7;
     FLOAT tmp10, tmp11, tmp12, tmp13;
-    FLOAT z1;
     FLOAT temp[64];
     int i;
 
@@ -204,9 +217,10 @@ void ff_faandct248(DCTELEM * data)
         data[8*0 + i] = lrintf(SCALE(8*0 + i) * (tmp10 + tmp11));
         data[8*4 + i] = lrintf(SCALE(8*4 + i) * (tmp10 - tmp11));
 
-        z1 = (tmp12 + tmp13)* A1;
-        data[8*2 + i] = lrintf(SCALE(8*2 + i) * (tmp13 + z1));
-        data[8*6 + i] = lrintf(SCALE(8*6 + i) * (tmp13 - z1));
+        tmp12 += tmp13;
+        tmp12 *= A1;
+        data[8*2 + i] = lrintf(SCALE(8*2 + i) * (tmp13 + tmp12));
+        data[8*6 + i] = lrintf(SCALE(8*6 + i) * (tmp13 - tmp12));
 
         tmp10 = tmp4 + tmp7;
         tmp11 = tmp5 + tmp6;
@@ -216,8 +230,9 @@ void ff_faandct248(DCTELEM * data)
         data[8*1 + i] = lrintf(SCALE(8*0 + i) * (tmp10 + tmp11));
         data[8*5 + i] = lrintf(SCALE(8*4 + i) * (tmp10 - tmp11));
 
-        z1 = (tmp12 + tmp13)* A1;
-        data[8*3 + i] = lrintf(SCALE(8*2 + i) * (tmp13 + z1));
-        data[8*7 + i] = lrintf(SCALE(8*6 + i) * (tmp13 - z1));
+        tmp12 += tmp13;
+        tmp12 *= A1;
+        data[8*3 + i] = lrintf(SCALE(8*2 + i) * (tmp13 + tmp12));
+        data[8*7 + i] = lrintf(SCALE(8*6 + i) * (tmp13 - tmp12));
     }
 }