From: lkcl <lkcl@web>
Date: Mon, 1 May 2023 12:26:04 +0000 (+0100)
Subject: (no commit message)
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=c1790df2b83c038bfcc7aec9831e207fc4811572;p=libreriscv.git

---

diff --git a/openpower/sv/remap.mdwn b/openpower/sv/remap.mdwn
index 64bff0b5b..d5b622537 100644
--- a/openpower/sv/remap.mdwn
+++ b/openpower/sv/remap.mdwn
@@ -636,7 +636,7 @@ disabled: the register's elements are a linear (1D) vector.
 |xdimsz|ydimsz| zdimsz  | permute | invxyz  |offset|skip   |mode |Matrix |
 |xdimsz|ydimsz|SVGPR    | 11/     |sk1/invxy|offset|elwidth|0b00 |Indexed|
 |xdimsz|mode  | zdimsz  | submode2| invxyz  |offset|submode|0b01 |DCT/FFT|
-| rsvd |rsvd  |xdimsz   | rsvd    | invxyz  |offset|submode|0b10 |Preduce|
+| rsvd |rsvd  |xdimsz   | rsvd    | invxyz  |offset|submode|0b10 |Red/Sum|
 |      |      |         |         |         |      |       |0b11 |rsvd   |
 
 `mode` sets different behaviours (straight matrix multiply, FFT, DCT).
@@ -644,18 +644,20 @@ disabled: the register's elements are a linear (1D) vector.
 * **mode=0b00** sets straight Matrix Mode
 * **mode=0b00** with permute=0b110 or 0b111 sets Indexed Mode
 * **mode=0b01** sets "FFT/DCT" mode and activates submodes
-* **mode=0b10** sets "Parallel Reduction" Schedules.
+* **mode=0b10** sets "Parallel Reduction or Prefix-Sum" Schedules.
 
 *Architectural Resource Allocation note: the four SVSHAPE SPRs are best
 allocated sequentially and contiguously in order that `sv.mtspr` may
-be used*
+be used. This is safe to do as long as `SVSTATE.SVme=0`*
 
-## Parallel Reduction Mode
+## Parallel Reduction / Prefix-Sum Mode
 
-Creates the Schedules for Parallel Tree Reduction.
+Creates the Schedules for Parallel Tree Reduction and Prefix-Sum
 
-* **submode=0b00** selects the left operand index
-* **submode=0b01** selects the right operand index
+* **submode=0b00** selects the left operand index for Reduction
+* **submode=0b01** selects the right operand index for Reduction
+* **submode=0b10** selects the left operand index for Prefix-Sum
+* **submode=0b11** selects the right operand index for Prefix-Sum
 
 * When bit 0 of `invxyz` is set, the order of the indices
   in the inner for-loop are reversed. This has the side-effect