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 4482f2a1fea2953175b810c9c57eec4f37eaff7e..908ba3c26cf38fb5ada7ba0badd3c2ae824f89f3 100644 (file)
--- 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;