From: Luke Kenneth Casson Leighton <lkcl@lkcl.net>
Date: Sat, 8 Feb 2020 16:35:12 +0000 (+0000)
Subject: update tables for dynamic shift
X-Git-Tag: convert-csv-opcode-to-binary~3511
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=45429500320cbcedaaf421e631b227fd98d4aa71;p=libreriscv.git

update tables for dynamic shift
---

diff --git a/3d_gpu/architecture/dynamic_simd/shift.mdwn b/3d_gpu/architecture/dynamic_simd/shift.mdwn
index 1d3dfcdb1..39820e449 100644
--- a/3d_gpu/architecture/dynamic_simd/shift.mdwn
+++ b/3d_gpu/architecture/dynamic_simd/shift.mdwn
@@ -38,15 +38,53 @@ Table based on partitions:
 p2p1p0 | o0        | o1       | o2       | o3
 ++++++ | ++++++++  | ++++++++ | ++++++++ | ++
 0 0 0  | a0b0      | a1b0     | a2b0     | a3b0
-0 0 1  | eq0       | &(eq1-3) | 0        | 0
-0 1 0  | &(eq0-1)  | 0        | &(eq2-3) | 0
-0 1 1  | eq0       | eq1      | &(eq2-3) | 0
-1 0 0  | &(eq0-2)  | 0        | 0        | eq3
-1 0 1  | eq0       | &(eq1-2) | 0        | eq3
-1 1 0  | &(eq0-1)  | 0        | eq2      | eq3
-1 1 1  | eq0       | eq1      | eq2      | eq3
+0 0 1  | a0b0      | a1b1     | a2b1     | a3b1
+0 1 0  | a0b0      | a1b0     | a2b2     | a3b2
+0 1 1  | a0b0      | a1b1     | a2b2     | a3b2
+1 0 0  | a0b0      | a1b0     | a2b0     | a3b3
+1 0 1  | a0b0      | a1b1     | a2b1     | a3b3
+1 1 0  | a0b0      | a1b0     | a2b2     | a3b3
+1 1 1  | a0b0      | a1b1     | a2b2     | a3b3
 """]]
 
+Therefore, the actual output for o1 looks something like this:
+
+    p2p1p0 : o1
+    0 0 0  : a0b0[15:8] | a1b0[7:0]
+    0 0 1  | a0b0[15:8] | a1b1[7:0]
+    0 1 0  | a0b0[15:8] | a1b0[7:0]
+    0 1 1  | a0b0[15:8] | a1b1[7:0]
+    1 0 0  | a0b0[15:8] | a1b0[7:0]
+    1 0 1  | a0b0[15:8] | a1b1[7:0]
+    1 1 0  | a0b0[15:8] | a1b0[7:0]
+    1 1 1  | a0b0[15:8] | a1b1[7:0]
+
+For o2:
+
+    p2p1p0 : o2
+    0 0 0  | a0b0[23:16] | a1b0[15:8] | a2b0
+    0 0 1  | a0b0[23:16] | a1b1[15:8] | a2b1
+    0 1 0  | a0b0[23:16] | a1b0[15:8] | a2b2
+    0 1 1  | a0b0[23:16] | a1b1[15:8] | a2b2
+    1 0 0  | a0b0[23:16] | a1b0[15:8] | a2b0
+    1 0 1  | a0b0[23:16] | a1b1[15:8] | a2b1
+    1 1 0  | a0b0[23:16] | a1b0[15:8] | a2b2
+    1 1 1  | a0b0[23:16] | a1b1[15:8] | a2b2
+
+For o3:
+
+    p2p1p0 | o3
+    0 0 0  | a0b0[31:24] | a1b0[23:16] | a2b0[15:8] | a3b0
+    0 0 1  | a0b0[31:24] | a1b1[23:16] | a2b1[15:8] | a3b1
+    0 1 0  | a0b0[31:24] | a1b0[23:16] | a2b2[15:8] | a3b2
+    0 1 1  | a0b0[31:24] | a1b1[23:16] | a2b2[15:8] | a3b2
+    1 0 0  | a0b0[31:24] | a1b0[23:16] | a2b0[15:8] | a3b3
+    1 0 1  | a0b0[31:24] | a1b1[23:16] | a2b1[15:8] | a3b3
+    1 1 0  | a0b0[31:24] | a1b0[23:16] | a2b2[15:8] | a3b3
+    1 1 1  | a0b0[31:24] | a1b1[23:16] | a2b2[15:8] | a3b3
+
+Where for o0 the output is simple a0b0 for all partition permutations.
+
 # Static Partitioned Shift
 
 Static shift is pretty straightforward: the input is the entire number