From dd34b61983a29c72731fb0d3c68e384b83113b94 Mon Sep 17 00:00:00 2001 From: lkcl Date: Sun, 21 Aug 2022 14:30:46 +0100 Subject: [PATCH] --- openpower/sv/ldst.mdwn | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/openpower/sv/ldst.mdwn b/openpower/sv/ldst.mdwn index 3c7a34456..dafa81d6e 100644 --- a/openpower/sv/ldst.mdwn +++ b/openpower/sv/ldst.mdwn @@ -292,11 +292,13 @@ Indexed LD is: Note in both cases that [[sv/svp64]] allows RA-as-a-dest in "update" mode (`ldux`) to be effectively a *completely different* register from RA-as-a-source. This because there is room in svp64 to extend RA-as-src as well as RA-as-dest, both independently as scalar or vector *and* independently extending their range. -*Programmer's note: being able to set RA-as-a-source to Vector - but RA-as-a-destination as Scalar is **extremely valuable** +*Programmer's note: being able to set RA-as-a-source + as separate from RA-as-a-destination as Scalar is **extremely valuable** once it is remembered that Simple-V element operations must - be in Program Order. What that means is that the very last - update to RA will * + be in Program Order, especially in loops, for saving on + multiple address computations. Care does have + to be taken however that RA-as-src is not overwritten by + RA-as-dest especially in element-strided Mode.* # LD/ST Indexed vs Indexed REMAP -- 2.30.2