Add springbok vector unit test for vmerge

Added a simple vector unit test for vmerge operations to verify if vmerge.vim and vmerge.vvm work properly.

Test results:
- vmerge.vim and vmerge.vvm tests passed for Qemu and Renode.

Change-Id: Id6108ed7577cdc159de2b602ec2b806a39f7e7f5

tests/CMakeLists.txt

diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 4214281..a1087c8 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -518,3 +518,12 @@
   LINKOPTS
     -Xlinker --defsym=__itcm_length__=128K
 )
+
+vec_cc_test(
+  NAME
+    vmerge_test
+  SRCS
+    vmerge_test.cpp
+  LINKOPTS
+    -Xlinker --defsym=__itcm_length__=128K
+)

tests/vmerge_test.cpp

diff --git a/tests/vmerge_test.cpp b/tests/vmerge_test.cpp
new file mode 100644
index 0000000..a8f741f
--- /dev/null
+++ b/tests/vmerge_test.cpp
@@ -0,0 +1,106 @@
+#include <stdlib.h>
+
+#include "pw_unit_test/framework.h"
+#include "test_v_helpers.h"
+
+// Test for vmerge.vim and vmerge.vvm instructions.
+namespace vmerge_test {
+namespace {
+
+using namespace test_v_helpers;
+
+uint8_t src_vector_1[MAXVL_BYTES];
+uint8_t src_vector_2[MAXVL_BYTES];
+uint8_t src_mask_vector[MAXVL_BYTES];
+uint8_t dest_vector[MAXVL_BYTES];
+
+class VmergeTest : public ::testing::Test {
+ protected:
+  void SetUp() override { zero_vector_registers(); }
+  void TearDown() override { zero_vector_registers(); }
+};
+
+TEST_F(VmergeTest, vmerge_vim) {
+  for (int i = 0; i < AVL_COUNT; i++) {
+    int32_t avl = AVLS[i];
+    int vlmax;
+    int vl;
+    /* For non narrowing instructions all vectors have same type*/
+    std::tie(vlmax, vl) = vector_test_setup<uint8_t>(
+        VLMUL::LMUL_M1, avl, {dest_vector, src_vector_2, src_mask_vector});
+    if (avl > vlmax) {
+      continue;
+    }
+
+    fill_random_vector<uint8_t>(src_vector_2, vl);
+    fill_random_vector<uint8_t>(src_mask_vector, vl);
+    const int8_t test_val = 12;
+
+    // Load vector registers
+    __asm__ volatile("vle8.v v16, (%0)" : : "r"(src_vector_2));
+    __asm__ volatile("vle8.v v0, (%0)" : : "r"(src_mask_vector));
+
+    // Run target instruction
+    __asm__ volatile("vmerge.vim v24, v16, %[IMM], v0" ::[IMM] "n"(test_val));
+
+    // Store result vector register
+    __asm__ volatile("vse8.v v24, (%0)" : : "r"(dest_vector));
+
+    // Check vector elements
+    constexpr uint32_t kShift = 3;  // shift for uint8_t
+    for (int idx = 0; idx < vl; idx++) {
+      uint32_t mask_idx = idx >> kShift;
+      uint32_t mask_pos = idx & ~(mask_idx << kShift);
+      if (src_mask_vector[mask_idx] & (1 << mask_pos)) {
+        ASSERT_EQ(dest_vector[idx], test_val);
+      } else {
+        ASSERT_EQ(dest_vector[idx], src_vector_2[idx]);
+      }
+    }
+  }
+}
+
+TEST_F(VmergeTest, vmerge_vvm) {
+  for (int i = 0; i < AVL_COUNT; i++) {
+    int32_t avl = AVLS[i];
+    int vlmax;
+    int vl;
+    /* For non narrowing instructions all vectors have same type*/
+    std::tie(vlmax, vl) = vector_test_setup<uint8_t>(
+        VLMUL::LMUL_M1, avl,
+        {dest_vector, src_vector_1, src_vector_2, src_mask_vector});
+    if (avl > vlmax) {
+      continue;
+    }
+
+    fill_random_vector<uint8_t>(src_vector_1, vl);
+    fill_random_vector<uint8_t>(src_vector_2, vl);
+    fill_random_vector<uint8_t>(src_mask_vector, vl);
+
+    // Load vector registers
+    __asm__ volatile("vle8.v v8, (%0)" : : "r"(src_vector_1));
+    __asm__ volatile("vle8.v v16, (%0)" : : "r"(src_vector_2));
+    __asm__ volatile("vle8.v v0, (%0)" : : "r"(src_mask_vector));
+
+    // Run target instruction
+    __asm__ volatile("vmerge.vvm v24, v16, v8, v0");
+
+    // Store result vector register
+    __asm__ volatile("vse8.v v24, (%0)" : : "r"(dest_vector));
+
+    // Check vector elements
+    constexpr uint32_t kShift = 3;  // shift for uint8_t
+    for (int idx = 0; idx < vl; idx++) {
+      uint32_t mask_idx = idx >> kShift;
+      uint32_t mask_pos = idx & ~(mask_idx << kShift);
+      if (src_mask_vector[mask_idx] & (1 << mask_pos)) {
+        ASSERT_EQ(dest_vector[idx], src_vector_1[idx]);
+      } else {
+        ASSERT_EQ(dest_vector[idx], src_vector_2[idx]);
+      }
+    }
+  }
+}
+
+}  // namespace
+}  // namespace vmerge_test