ARMv6 optimised pix_sum
[ffmpeg.git] / libavcodec / arm / dsputil_armv6.S
index ffe6c42..acdfa12 100644 (file)
@@ -594,3 +594,28 @@ function ff_pix_norm1_armv6, export=1
         mov             r0,  lr
         pop             {r4-r6, pc}
 .endfunc
+
+function ff_pix_sum_armv6, export=1
+        push            {r4-r7, lr}
+        mov             r12, #16
+        mov             r2,  #0
+        mov             r3,  #0
+        mov             lr,  #0
+        ldr             r4,  [r0]
+1:
+        subs            r12, r12, #1
+        ldr             r5,  [r0, #4]
+        usada8          r2,  r4,  lr,  r2
+        ldr             r6,  [r0, #8]
+        usada8          r3,  r5,  lr,  r3
+        ldr             r7,  [r0, #12]
+        usada8          r2,  r6,  lr,  r2
+        beq             2f
+        ldr             r4,  [r0, r1]!
+        usada8          r3,  r7,  lr,  r3
+        bgt             1b
+2:
+        usada8          r3,  r7,  lr,  r3
+        add             r0,  r2,  r3
+        pop             {r4-r7, pc}
+.endfunc