From b03132a8023aa8fd4603c4e7e9fa52f317fffb77 Mon Sep 17 00:00:00 2001 From: lkcl Date: Sat, 22 Oct 2022 17:41:35 +0100 Subject: [PATCH] --- openpower/sv/biginteger.mdwn | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/openpower/sv/biginteger.mdwn b/openpower/sv/biginteger.mdwn index 46a421a95..8ff2396d9 100644 --- a/openpower/sv/biginteger.mdwn +++ b/openpower/sv/biginteger.mdwn @@ -63,8 +63,12 @@ is Z23-Form in "overwrite" on RT. Both instructions take two 64-bit sources, concatenate them together then extract 64 bits from it, the offset location determined by a third source. So as to avoid -costly 4-reg (VA-Form) a 2-bit mode `sm` gives four -potential overwrite and zero-source options instead. +costly 4-reg (VA-Form) and to allow Vectorised versions +to use EXTRA3 a 2-bit mode `sm` gives four +potential overwrite and zero-source options instead +(a 4-reg VA-Form Vector variant would use EXTRA2, +limiting the vector offset range and preventing its +use in biginteger vector-shift operations). # maddedu -- 2.30.2