[gem5-dev] Change in gem5/gem5[master]: arch-power: Add fixed-point logical bit permute instructions

[Sandipan Das (Gerrit)]

Sandipan Das has uploaded this change for review. (  
https://gem5-review.googlesource.com/c/public/gem5/+/16632

Change subject: arch-power: Add fixed-point logical bit permute instructions
......................................................................

arch-power: Add fixed-point logical bit permute instructions

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

Change-Id: I1af329cd28871c00ebb0574e38a53bcd6a3b794c
Signed-off-by: Sandipan Das <sandi...@linux.ibm.com>
---
M src/arch/power/isa/decoder.isa
1 file changed, 13 insertions(+), 0 deletions(-)



diff --git a/src/arch/power/isa/decoder.isa b/src/arch/power/isa/decoder.isa
index abecc8f..e267c63 100644
--- a/src/arch/power/isa/decoder.isa
+++ b/src/arch/power/isa/decoder.isa
@@ -589,6 +589,19 @@
                 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;

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Gerrit-Project: public/gem5
Gerrit-Branch: master
Gerrit-Change-Id: I1af329cd28871c00ebb0574e38a53bcd6a3b794c
Gerrit-Change-Number: 16632
Gerrit-PatchSet: 1
Gerrit-Owner: Sandipan Das <sandi...@linux.ibm.com>
Gerrit-MessageType: newchange
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