From: Konstantinos Margaritis <konstantinos.margaritis@vectorcamp.gr>
Date: Wed, 21 Sep 2022 13:29:02 +0000 (+0000)
Subject: fix comments
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=b7f4c474bcecf3dbe8c22ac184487c695b233f8f;p=openpower-isa.git

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 c8cae746..bf76a0d2 100644
--- 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