From 8d63d1ebf18c51fbcf395f4b933c754e8eb1cfe5 Mon Sep 17 00:00:00 2001 From: lkcl Date: Sun, 23 Apr 2023 13:52:17 +0100 Subject: [PATCH] --- openpower/sv/sprs.mdwn | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/openpower/sv/sprs.mdwn b/openpower/sv/sprs.mdwn index 74d4b0e12..e6e9d17b3 100644 --- a/openpower/sv/sprs.mdwn +++ b/openpower/sv/sprs.mdwn @@ -147,8 +147,9 @@ to statically detect and potentially express. independent of each other (no Register *or Memory* Hazards). Elements are considered to be in the same source batch if they have -the same value of `FLOOR(srcstep/hphint)`. Likewise in the same destination batch. -Three key observations here: +the same value of `FLOOR(srcstep/hphint)`. Likewise in the same destination batch +for the same value `FLOOR(dststep/hphint)`. +Four key observations here: 1. predication is **not** involved here. the number of actual elements involved is considered *before* predicate masks are applied. @@ -156,6 +157,10 @@ involved is considered *before* predicate masks are applied. batches 3. batch evaluation is done *before* REMAP, making Hazard elimination easier for Multi-Issue systems. +4. `hphint` is *not* limited to power-of-two. Hardware implementors may choose + a lower parallelism hint up to `hphint` and may find power-of-two more + convenient. Actual parallelism (Dependency Hazard relaxation) must **never** + exceed `hphint`. *Hardware Architect note: each element within the same group may be treated as 100% independent from any other element within that group, and therefore -- 2.30.2