Optimize vp9_tm_predictor_8x8_neon function

Change-Id: Ia12aae491202098ff66366145aa0c3da38dc97e5

vp9/common/arm/neon/vp9_reconintra_neon.asm

@@ -353,53 +353,52 @@ loop_h
     vsubl.u8            q3, d2, d0
 
     ; Load left row by row and compute left + (above - ytop_left)
+    vld1.u8             {d6}, [r3]
+
     ; 1st row and 2nd row
-    ldrb                r12, [r3], #1
-    ldrb                r2, [r3], #1
-    vdup.u16            q1, r12
-    vdup.u16            q2, r2
-    vadd.s16            q1, q1, q3
-    vadd.s16            q2, q2, q3
-    vqshrun.s16         d0, q1, #0
-    vqshrun.s16         d1, q2, #0
-    vst1.64             {d0}, [r0], r1
-    vst1.64             {d1}, [r0], r1
+    vdup.u8             d0, d6[0]
+    vdup.u8             d1, d6[1]
+    vaddw.s16           q1, q3, d0
+    vaddw.s16           q2, q3, d1
 
     ; 3rd row and 4th row
-    ldrb                r12, [r3], #1
-    ldrb                r2, [r3], #1
-    vdup.u16            q1, r12
-    vdup.u16            q2, r2
-    vadd.s16            q1, q1, q3
-    vadd.s16            q2, q2, q3
+    vdup.u8             d0, d6[2]
+    vdup.u8             d1, d6[3]
+    vaddw.s16           q8, q3, d0
+    vaddw.s16           q9, q3, d1
+
     vqshrun.s16         d0, q1, #0
     vqshrun.s16         d1, q2, #0
+    vqshrun.s16         d2, q8, #0
+    vqshrun.s16         d3, q9, #0
+
     vst1.64             {d0}, [r0], r1
     vst1.64             {d1}, [r0], r1
+    vst1.64             {d2}, [r0], r1
+    vst1.64             {d3}, [r0], r1
 
     ; 5th row and 6th row
-    ldrb                r12, [r3], #1
-    ldrb                r2, [r3], #1
-    vdup.u16            q1, r12
-    vdup.u16            q2, r2
-    vadd.s16            q1, q1, q3
-    vadd.s16            q2, q2, q3
-    vqshrun.s16         d0, q1, #0
-    vqshrun.s16         d1, q2, #0
-    vst1.64             {d0}, [r0], r1
-    vst1.64             {d1}, [r0], r1
+    vdup.u8             d0, d6[4]
+    vdup.u8             d1, d6[5]
+    vaddw.s16           q1, q3, d0
+    vaddw.s16           q2, q3, d1
 
     ; 7rd row and 8th row
-    ldrb                r12, [r3], #1
-    ldrb                r2, [r3], #1
-    vdup.u16            q1, r12
-    vdup.u16            q2, r2
-    vadd.s16            q1, q1, q3
-    vadd.s16            q2, q2, q3
+    vdup.u8             d0, d6[6]
+    vdup.u8             d1, d6[7]
+    vaddw.s16           q8, q3, d0
+    vaddw.s16           q9, q3, d1
+
     vqshrun.s16         d0, q1, #0
     vqshrun.s16         d1, q2, #0
+    vqshrun.s16         d2, q8, #0
+    vqshrun.s16         d3, q9, #0
+
     vst1.64             {d0}, [r0], r1
     vst1.64             {d1}, [r0], r1
+    vst1.64             {d2}, [r0], r1
+    vst1.64             {d3}, [r0], r1
+
     bx                  lr
     ENDP                ; |vp9_tm_predictor_8x8_neon|