From eee568d5224ca9e4d2b285ebcd5e2c68631b01db Mon Sep 17 00:00:00 2001 From: lkcl Date: Thu, 23 Jun 2022 19:23:24 +0100 Subject: [PATCH] --- openpower/sv/svstep.mdwn | 17 ++++++++++++++--- 1 file changed, 14 insertions(+), 3 deletions(-) diff --git a/openpower/sv/svstep.mdwn b/openpower/sv/svstep.mdwn index cee53a613..163c91150 100644 --- a/openpower/sv/svstep.mdwn +++ b/openpower/sv/svstep.mdwn @@ -27,12 +27,23 @@ Instruction format: svstep RT,SVi,vf (Rc=0) svstep. RT,SVi,vf (Rc=1) -When `vf=1` then the REMAP Schedule for a given SVSHAPE, specified -in `SVi` (values 0-3 are legal) may be -returned in `RT`. To obtain the full set of possible computed element +When `vf=1` then stepping occurs. When `vf=0` svstep may be used +to enquire about the REMAP Schedule state, without altering internal +state. If `SVi=0, Rc=0, vf=0` this instruction is a `nop`. + +When `SVi` is 1-4 the REMAP Schedule for a given SVSHAPE may be +returned in `RT`. SVi=1 selects SVSHAPE0 current state, +through to SVi=4 selects SVSHAPE3. + +To obtain the full set of possible computed element indices use `svstep RT.v,SVI,1` which will store all computed element indices, starting from RT. If Rc=1 then a co-result Vector of CR Fields will also be returned, comprising the "end-points" of each of the inner loops when either Matrix Mode or DCT/FFT is set. In other words, for example, when the `xdim` inner loop reaches the end and on the next iteration it will begin again at zero, the CR Field `EQ` will be set. + +*Programmer's note: VL in some situations, particularly larger Matrices, +may exceed 64, +meaning that `sv.svshape` returning a considerable number of values. Under +such circumstances `sv.svshape/ew=8` is recommended.* -- 2.30.2