fix comments

diff --git a/media/video/libvpx/vpx_get_mb_ss_svp64_real.s b/media/video/libvpx/vpx_get_mb_ss_svp64_real.s
index c8cae74600cfc3646912a289c0b2491ecd5f43e5..bf76a0d24f3ce5a7393196b8c1177c36129657b1 100644 (file)
--- a/media/video/libvpx/vpx_get_mb_ss_svp64_real.s
+++ b/media/video/libvpx/vpx_get_mb_ss_svp64_real.s
@@ -16,22 +16,21 @@
 vpx_get_mb_ss_svp64_real:
 .LFB0:
        .cfi_startproc
-       li sum, 0
-       li ctr, 8
-       mtctr ctr
-       setvl 0,0,32,0,1,1                      # Set VL to 64 elements
+       # Set sum to zero
+       li sum, 0                               # Set sum to zero
+       li ctr, 8                               # Need 8 iterations of 32 elements
+       mtctr ctr                               # Set counter special register
+       setvl 0,0,32,0,1,1                      # Set VL to 32 elements
 .L2:
-       # Load 32 ints from (in)
-       sv.lha          *src, 0(in)
+       sv.lha          *src, 0(in)             # Load 32 ints from (in)
        # equivalent to: for (i = 0; i < 32; i++) vprod[i] = src[i] * src[i];
        sv.mulld        *prod, *src, *src
        # equivalent to: for (i = 0; i < 32; i++) sum += prod[i];
        sv.add/mr       sum, *prod, sum
-       addi in, in, 64
-#      rldicl in,ctr,0,32
-       bdnz .L2
-       li in, 0
-       addi in, sum, 0
+       addi in, in, 64                         # Advance (in) pointer by 64 bytes
+       bdnz .L2                                # Loop until CTR is zero
+       li in, 0                                # Zero register 3 (result)
+       addi in, sum, 0                         # Add sum to r3
        blr
        .long 0
        .byte 0,0,0,0,0,0,0,0