From: Sandipan Das <sandipan@linux.vnet.ibm.com>
Date: Thu, 7 Jun 2018 06:37:31 +0000 (+0530)
Subject: arch-power: Add fixed-point doubleword arithmetic divide instructions
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=460447f99bd3d1605c3510a4d9ab48b1aca2176b;p=gem5.git

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 83e3efca2..3f0949cd7 100644
--- a/src/arch/power/isa/decoder.isa
+++ b/src/arch/power/isa/decoder.isa
@@ -719,6 +719,30 @@ 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 {