From: lkcl <lkcl@web>
Date: Thu, 30 Mar 2023 11:26:31 +0000 (+0100)
Subject: (no commit message)
X-Git-Tag: opf_rfc_ls012_v1~212
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e6be3f7ff2374555f6a0b59a1bef2e169ecd5403;p=libreriscv.git

---

diff --git a/openpower/sv/rfc/ls010.mdwn b/openpower/sv/rfc/ls010.mdwn
index 9acc60cd7..ceb6848a3 100644
--- a/openpower/sv/rfc/ls010.mdwn
+++ b/openpower/sv/rfc/ls010.mdwn
@@ -661,25 +661,43 @@ single-predicate, three registers (2 read, 1 write)
 The primary purpose for this encoding is for Twin Predication on LOAD
 and STORE operations.  see [[sv/ldst]] for detailed anslysis.
 
-RM-2P-2S1D:
+**RM-2P-2S1D:**
 
 | Field Name | Field bits | Description                     |
 |------------|------------|----------------------------|
 | Rdest_EXTRA2 | `10:11`  | extends Rdest (R\*\_EXTRA2 Encoding)   |
 | Rsrc1_EXTRA2 | `12:13`  | extends Rsrc1 (R\*\_EXTRA2 Encoding)   |
 | Rsrc2_EXTRA2 | `14:15`  | extends Rsrc2 (R\*\_EXTRA2 Encoding)   |
-| MASK_SRC     | `16:18`  | Execution Mask for Source     |
+| MASK_SRC     | `16:18`  | Execution Mask for Source     | 
+
+**RM-2P-1S2D:**
 
-Note that for 1S2P the EXTRA2 dest and src names are switched (Rsrc_EXTRA2
+For RM-2P-1S2D the EXTRA2 dest and src names are switched (Rsrc_EXTRA2
 is in bits 10:11, Rdest1_EXTRA2 in 12:13)
 
-Also that for 3S (to cover `stdx` etc.) the names are switched to 3 src:
+| Field Name | Field bits | Description                     |
+|------------|------------|----------------------------|
+| Rsrc2_EXTRA2 | `10:11`  | extends Rsrc2 (R\*\_EXTRA2 Encoding)   |
+| Rsrc1_EXTRA2 | `12:13`  | extends Rsrc1 (R\*\_EXTRA2 Encoding)   |
+| Rdest_EXTRA2 | `14:15`  | extends Rdest (R\*\_EXTRA2 Encoding)   |
+| MASK_SRC     | `16:18`  | Execution Mask for Source     |
+
+**RM-2P-3S:**
+
+Also that for RM-2P-3S (to cover `stdx` etc.) the names are switched to 3 src:
 Rsrc1_EXTRA2, Rsrc2_EXTRA2, Rsrc3_EXTRA2.
 
-Note also that LD with update indexed, which takes 2 src and 2 dest
-(e.g. `lhaux RT,RA,RB`), does not have room for 4 registers and also
-Twin Predication.  therefore these are treated as RM-2P-2S1D and the
-src spec for RA is also used for the same RA as a dest.
+| Field Name | Field bits | Description                     |
+|------------|------------|----------------------------|
+| Rsrc1_EXTRA2 | `10:11`  | extends Rsrc1 (R\*\_EXTRA2 Encoding)   |
+| Rsrc2_EXTRA2 | `12:13`  | extends Rsrc2 (R\*\_EXTRA2 Encoding)   |
+| Rsrc3_EXTRA2 | `14:15`  | extends Rsrc3 (R\*\_EXTRA2 Encoding)   |
+| MASK_SRC     | `16:18`  | Execution Mask for Source     | 
+
+Note also that LD with update indexed, which takes 2 src and 
+creates 2 dest registers (e.g. `lhaux RT,RA,RB`), does not have room
+for 4 registers and also Twin Predication.  Therefore these are treated as
+RM-2P-2S1D and the src spec for RA is also used for the same RA as a dest.
 
 Note that if ELWIDTH != ELWIDTH_SRC this may result in reduced performance
 or increased latency in some implementations due to lane-crossing.
@@ -694,8 +712,8 @@ EXTRA is the means by which two things are achieved:
 
 The register files are therefore extended:
 
-* INT is extended from r0-31 to r0-127
-* FP is extended from fp0-32 to fp0-fp127
+* INT (GPR) is extended from r0-31 to r0-127
+* FP (FPR) is extended from fp0-32 to fp0-fp127
 * CR Fields are extended from CR0-7 to CR0-127
 
 However due to pressure in `RM.EXTRA` not all these registers