From 5ebe43c1738c778ffa262e2ff7273b7dcf687adc Mon Sep 17 00:00:00 2001 From: Luke Kenneth Casson Leighton Date: Wed, 5 Apr 2023 11:17:20 +0100 Subject: [PATCH] add future potential section on DD-FF-Rc=1 --- openpower/sv/ldst.mdwn | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/openpower/sv/ldst.mdwn b/openpower/sv/ldst.mdwn index cb26ac0cf..d2747b2db 100644 --- a/openpower/sv/ldst.mdwn +++ b/openpower/sv/ldst.mdwn @@ -513,6 +513,15 @@ the pairs, and consequently allowing Vectorised Data-Dependent Fail-First is useful. Care should be taken however when VL is truncated in Vertical-First Mode. +**Future potential** + +Although Rc=1 on LD/ST is a rare occurrence at present, future versions +of Power ISA *might* conceivably have Rc=1 LD/ST Scalar instructions, and +with the SVP64 Vectorisation Prefixing being itself a RISC-paradigm that +is itself fully-independent of the Scalar Suffix Defined Words, prohibiting +Rc=1 Data-Dependent Mode on future potential LD/ST operations is not +strategically sound. + ## LOAD/STORE Elwidths Loads and Stores are almost unique in that the Power Scalar ISA -- 2.30.2