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diff --git a/openpower/sv/biginteger.mdwn b/openpower/sv/biginteger.mdwn
index b122c428a7701d225c64af6d7d58b0fcd975e8fa..5a054070f5039f88d9976436582a5ae5137e4bef 100644 (file)
--- a/openpower/sv/biginteger.mdwn
+++ b/openpower/sv/biginteger.mdwn
@@ -71,8 +71,10 @@ equivalent to `maddld` because `maddld` performs sign-extension on RC.
 *Programmer's Note:
 As a Scalar Power ISA operation, like `lq` and `stq`, RS=RT+1.
 To achieve the same big-integer rolling-accumulation effect
-as SVP64, instructions may be issued `madded r20,r4,r8,r20
-madded r21,r5,r9,r21` etc. where the first `madded` will have
+as SVP64: assuming the scalar to multiply is in r0, 
+the vector to multiply by starts at r4 and the result vector
+in r20, instructions may be issued `madded r20,r4,r0,r20
+madded r21,r5,r0,r21` etc. where the first `madded` will have
 stored the upper half of the 128-bit multiply into r21, such
 that it may be picked up by the second `madded`. Repeat inline
 to construct a larger bigint scalar-vector multiply,