From a6f24db83ab23899187830d7defff7c7800b1773 Mon Sep 17 00:00:00 2001
From: Eyck-Alexander Jentzsch <alex@minres.com>
Date: Tue, 18 Feb 2025 23:01:00 +0100
Subject: [PATCH] adds vssrl and vssra

---
 src/vm/vector_functions.hpp | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/src/vm/vector_functions.hpp b/src/vm/vector_functions.hpp
index 32d3160..d6c496c 100644
--- a/src/vm/vector_functions.hpp
+++ b/src/vm/vector_functions.hpp
@@ -588,6 +588,8 @@ void carry_vector_imm_op(uint8_t* V, unsigned funct, uint64_t vl, uint64_t vstar
     return;
 }
 template <typename T> bool get_rounding_increment(T v, uint64_t d, int64_t vxrm) {
+    if(d == 0)
+        return 0;
     switch(vxrm & 0b11) { // Mask to ensure only lower 2 bits are used
     case 0b00:            // rnu: round-to-nearest-up (add +0.5 LSB)
         return (v >> (d - 1)) & 1;
@@ -675,8 +677,16 @@ std::function<bool(uint64_t, vtype_t, dest_elem_t&, src_elem_t, src_elem_t)> get
                     return 0;
                 }
             };
-        // case 0b101010: // VSSRL
-        // case 0b101011: // VSSRA
+        case 0b101010: // VSSRL
+            return [](uint64_t vxrm, vtype_t vtype, dest_elem_t& vd, src_elem_t vs2, src_elem_t vs1) {
+                vd = roundoff(vs2, vs1 & shift_mask<src_elem_t>(), vxrm);
+                return 0;
+            };
+        case 0b101011: // VSSRA
+            return [](uint64_t vxrm, vtype_t vtype, dest_elem_t& vd, src_elem_t vs2, src_elem_t vs1) {
+                vd = roundoff(static_cast<std::make_signed_t<src_elem_t>>(vs2), vs1 & shift_mask<src_elem_t>(), vxrm);
+                return 0;
+            };
         // case 0b101110: // VNCLIPU
         // case 0b101111: // VNCLIP
         default: