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diff --git a/3d_gpu/architecture/dynamic_simd/shift.mdwn b/3d_gpu/architecture/dynamic_simd/shift.mdwn
index b4a3419cead159f12443d04ef427f57539e84883..2b28d6f5d532544bfbaa5e72abdaa96ec2ab3f17 100644 (file)
--- a/3d_gpu/architecture/dynamic_simd/shift.mdwn
+++ b/3d_gpu/architecture/dynamic_simd/shift.mdwn
@@ -12,9 +12,9 @@ QUESTION: should b1 be limited to min(b[8+4..8], 24), b2 be similarly limited to
 then, we compute the following matrix, with the first column output being the full width (32 bit), the second being only 24 bit, the third only 16 bit and finally the top part (comprising the most significant byte of a and b as input) being only 8 bit
 
     | a0 << b0 | a1 << b0 | a2 << b0 | a3 << b0
-    | a0 << b1 | a1 << b1 | a2 << b1 | a3 << b1
-    | a0 << b2 | a1 << b2 | a2 << b2 | a3 << b2
-    | a0 << b3 | a1 << b3 | a2 << b3 | a3 << b3
+    |          | a1 << b1 | a2 << b1 | a3 << b1
+    |          |          | a2 << b2 | a3 << b2
+    |          |          |          | a3 << b3
 
 Where multiply would perform a cascading-add across those partial results,
 shift is different in that we *know* (assume) that for each shift-amount