From 546b17959f6582e1b3112a1c28d539fd8b32e6ba Mon Sep 17 00:00:00 2001 From: lkcl Date: Tue, 14 Jun 2022 20:23:18 +0100 Subject: [PATCH] --- openpower/sv/mv.swizzle.mdwn | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/openpower/sv/mv.swizzle.mdwn b/openpower/sv/mv.swizzle.mdwn index d5b3e4287..27b59f8a7 100644 --- a/openpower/sv/mv.swizzle.mdwn +++ b/openpower/sv/mv.swizzle.mdwn @@ -206,6 +206,16 @@ Saturation and Predication also left out, for clarity: move_operation(RT+dst_idx, RA+src_idx+offs) ``` +**Vertical-First Mode** + +It is important to appreciate that *only* the main loop VL +is Vertical-First: the SUBVL loop is not. This makes sense +from the perspective that the Swizzle Move is a group of +moves, but is still a single instruction. Vertical-First +only performing one of the *sub*-elements at a time would +break that expectation. The exceptions to this, explained +later, are when Pack/Unpack is enabled. + **Effect of Saturation on Vectorised Swizzle** A useful convenience for pixel data is to be able to insert values -- 2.30.2