From: Sandipan Das <sandipan@linux.ibm.com>
Date: Sat, 6 Feb 2021 11:51:34 +0000 (+0530)
Subject: arch-power: Add bit permute instructions
X-Git-Tag: develop-gem5-snapshot~28
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=8e931edf7480effe91be820bab14eda970a82c78;p=gem5.git

arch-power: Add bit permute instructions

This adds the following instructions.
  * Bit Permute Doubleword (bpermd)

Change-Id: Iab3cc6729b9d59c95e29b4f1d3e2c0eb48fde917
Signed-off-by: Sandipan Das <sandipan@linux.ibm.com>
---

diff --git a/src/arch/power/isa/decoder.isa b/src/arch/power/isa/decoder.isa
index 4482f2a1f..908ba3c26 100644
--- a/src/arch/power/isa/decoder.isa
+++ b/src/arch/power/isa/decoder.isa
@@ -571,6 +571,19 @@ decode PO default Unknown::unknown() {
                 Ra = res;
             }});
 
+            252: bpermd({{
+                uint64_t res = 0;
+                for (int i = 0; i < 8; ++i) {
+                    int index = (Rs >> (i * 8)) & 0xff;
+                    if (index < 64) {
+                        if (Rb & (1ULL << (63 - index))) {
+                            res |= 1 << i;
+                        }
+                    }
+                }
+                Ra = res;
+            }});
+
             24: slw({{
                 if (Rb & 0x20) {
                     Ra = 0;