From c9b7962cd345d3f8e9619e15fb7dbc02c579c190 Mon Sep 17 00:00:00 2001
From: Eyck-Alexander Jentzsch <alex@minres.com>
Date: Mon, 17 Feb 2025 15:07:14 +0100
Subject: [PATCH] adds Vector Integer Divide Instructions

---
 src/vm/vector_functions.hpp | 38 +++++++++++++++++++++++++++++++++----
 1 file changed, 34 insertions(+), 4 deletions(-)

diff --git a/src/vm/vector_functions.hpp b/src/vm/vector_functions.hpp
index ae902af..c82462d 100644
--- a/src/vm/vector_functions.hpp
+++ b/src/vm/vector_functions.hpp
@@ -184,10 +184,40 @@ std::function<dest_elem_t(src2_elem_t, src1_elem_t)> get_funct(unsigned funct6,
             // case 0b011101: // VMNAND
             // case 0b011110: // VMNOR
             // case 0b011111: // VMXNOR
-            // case 0b100000: // VDIVU
-            // case 0b100001: // VDIV
-            // case 0b100010: // VREMU
-            // case 0b100011: // VREM
+        case 0b100000: // VDIVU
+            return [](src2_elem_t vs2, src1_elem_t vs1) -> dest_elem_t {
+                if(vs1 == 0)
+                    return -1;
+                else
+                    return vs2 / vs1;
+            };
+        case 0b100001: // VDIV
+            return [](src2_elem_t vs2, src1_elem_t vs1) -> dest_elem_t {
+                if(vs1 == 0)
+                    return -1;
+                else if(vs2 == std::numeric_limits<std::make_signed_t<src2_elem_t>>::min() &&
+                        static_cast<std::make_signed_t<src1_elem_t>>(vs1) == -1)
+                    return vs2;
+                else
+                    return static_cast<std::make_signed_t<src2_elem_t>>(vs2) / static_cast<std::make_signed_t<src1_elem_t>>(vs1);
+            };
+        case 0b100010: // VREMU
+            return [](src2_elem_t vs2, src1_elem_t vs1) -> dest_elem_t {
+                if(vs1 == 0)
+                    return vs2;
+                else
+                    return vs2 % vs1;
+            };
+        case 0b100011: // VREM
+            return [](src2_elem_t vs2, src1_elem_t vs1) -> dest_elem_t {
+                if(vs1 == 0)
+                    return vs2;
+                else if(vs2 == std::numeric_limits<std::make_signed_t<src2_elem_t>>::min() &&
+                        static_cast<std::make_signed_t<src1_elem_t>>(vs1) == -1)
+                    return 0;
+                else
+                    return static_cast<std::make_signed_t<src2_elem_t>>(vs2) % static_cast<std::make_signed_t<src1_elem_t>>(vs1);
+            };
         case 0b100100: // VMULHU
             return [](src2_elem_t vs2, src1_elem_t vs1) {
                 return (static_cast<twice_t<src2_elem_t>>(vs2) * static_cast<twice_t<src2_elem_t>>(vs1)) >> sizeof(dest_elem_t) * 8;