From: Dmitry Selyutin <ghostmansd@gmail.com>
Date: Tue, 1 Nov 2022 17:37:42 +0000 (+0300)
Subject: Revert "Revert "https://bugs.libre-soc.org/show_bug.cgi?id=966#c4""
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=e2c3ba9ca73f0775ba75e8447789b92ed01112b8;p=openpower-isa.git

Revert "Revert "https://bugs.libre-soc.org/show_bug.cgi?id=966#c4""

This reverts commit 975f1b62b0430ca93377ee1a18d8d9138d5b5254.
---

diff --git a/openpower/isa/bitmanip.mdwn b/openpower/isa/bitmanip.mdwn
index 89515ec9..5d404488 100644
--- a/openpower/isa/bitmanip.mdwn
+++ b/openpower/isa/bitmanip.mdwn
@@ -111,12 +111,8 @@ Z23-Form
 Pseudo-code:
 
     n <- (RB)
-    switch (sm)
-        case (0): sum[0:XLEN-1] = (n[0:XLEN-1-1] || [0]*1) + (RA)
-        case (1): sum[0:XLEN-1] = (n[0:XLEN-2-1] || [0]*2) + (RA)
-        case (2): sum[0:XLEN-1] = (n[0:XLEN-3-1] || [0]*3) + (RA)
-        default:  sum[0:XLEN-1] = (n[0:XLEN-4-1] || [0]*4) + (RA)
-    RT <- sum
+    m <- sm + 1
+    RT <- (n[m:XLEN-1] || [0]*m) + (RA)
 
 Special Registers Altered:
 
@@ -132,12 +128,8 @@ Z23-Form
 Pseudo-code:
 
     n <- ([0]*(XLEN/2)) || (RB)[XLEN/2:XLEN-1]
-    switch (sm)
-        case (0): sum[0:XLEN-1] = (n[0:XLEN-1-1] || [0]*1) + (RA)
-        case (1): sum[0:XLEN-1] = (n[0:XLEN-2-1] || [0]*2) + (RA)
-        case (2): sum[0:XLEN-1] = (n[0:XLEN-3-1] || [0]*3) + (RA)
-        default:  sum[0:XLEN-1] = (n[0:XLEN-4-1] || [0]*4) + (RA)
-    RT <- sum
+    m <- sm + 1
+    RT <- (n[m:XLEN-1] || [0]*m) + (RA)
 
 Special Registers Altered: