arch-power: Add fixed-point doubleword arithmetic divide instructions

This adds the following arithmetic instructions:
  * Divide Doubleword (divd[o][.])
  * Divide Doubleword Unsigned (divdu[o][.])

Change-Id: Iedfa46ee482201a25dbc195ac5cb7f5f5e83c29b
Signed-off-by: Sandipan Das <sandipan@linux.vnet.ibm.com>

diff --git a/src/arch/power/isa/decoder.isa b/src/arch/power/isa/decoder.isa
index ce25be51725c2336613ed10ca19d1b513f0e82b1..180d2c9d82b618a70fb30dc43ba639982865ef9b 100644 (file)
--- a/src/arch/power/isa/decoder.isa
+++ b/src/arch/power/isa/decoder.isa
@@ -721,6 +721,30 @@ decode PO default Unknown::unknown() {
                     }
                 }},
                 true);
+
+                489: divd({{
+                    int64_t src1 = Ra_sd;
+                    int64_t src2 = Rb_sd;
+                    if ((src1 != INT64_MIN || src2 != -1) && src2 != 0) {
+                        Rt = src1 / src2;
+                    } else {
+                        Rt = 0;
+                        setOV = true;
+                    }
+                }},
+                true);
+
+                457: divdu({{
+                    uint64_t src1 = Ra;
+                    uint64_t src2 = Rb;
+                    if (src2 != 0) {
+                        Rt = src1 / src2;
+                    } else {
+                        Rt = 0;
+                        setOV = true;
+                    }
+                }},
+                true);
             }
 
             default: decode XFX_XO {