From: lkcl <lkcl@web>
Date: Sun, 7 Mar 2021 16:37:37 +0000 (+0000)
Subject: (no commit message)
X-Git-Tag: convert-csv-opcode-to-binary~71
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=63908ec5f5f43e49fd2815b847ee719ff7616c9d;p=libreriscv.git

---

diff --git a/3d_gpu/architecture/dynamic_simd/logicops.mdwn b/3d_gpu/architecture/dynamic_simd/logicops.mdwn
index 8a51be53e..5262d3b92 100644
--- a/3d_gpu/architecture/dynamic_simd/logicops.mdwn
+++ b/3d_gpu/architecture/dynamic_simd/logicops.mdwn
@@ -16,6 +16,15 @@ they are instead SIMD versions of:
      for i in range(64):
          result = result xor a[i] # one operand
 
+more specifically (8x8 version):
+
+     result = 0 # 64 bit, clear all bits
+     for j in range(8)
+         partial = 0 # initial value (single bit)
+         for i in range(8):
+             partial = partial xor a[i+j*8]
+         result[j*8] = partial
+
 # Requirements
 
 Given a signal width (typically 64) and given an array of "Partition Points" (typically 7) that break the signal down into an arbitrary permutaion of 8 bit to 64 bit independent SIMD results, compute the following: