7080: repair unit tests related to unitialized indirect memory in a MOV

Author: jeanmon

barretenberg/cpp/pil/avm/main.pil

@@ -487,6 +487,11 @@ namespace main(256);
     sel_gas_accounting_active - OPCODE_SELECTORS - SEL_ALL_CTRL_FLOW - sel_op_sload - sel_op_sstore - sel_mem_op_activate_gas = 0;
 
     // Program counter must increment if not jumping or returning
+    // TODO: support for muli-rows opcode in execution trace such as
+    // radix, hash gadgets operations. At the moment, we have to increment
+    // the pc in witness generation for all rows pertaining to the original
+    // opcode. This is misleading. Ultimately, we want the pc to be incremented
+    // just after the last row of a given opcode.
     #[PC_INCREMENT]
     (1 - sel_first) * (1 - sel_op_halt) * OPCODE_SELECTORS * (pc' - (pc + 1)) = 0;
 

barretenberg/cpp/src/barretenberg/vm/tests/avm_mem_opcodes.test.cpp

@@ -173,7 +173,8 @@ class AvmMemOpcodeTests : public ::testing::Test {
                             uint32_t dst_offset,
                             AvmMemoryTag tag,
                             uint32_t dir_src_offset = 0,
-                            uint32_t dir_dst_offset = 0)
+                            uint32_t dir_dst_offset = 0,
+                            bool indirect_uninitialized = false)
     {
         compute_mov_indices(indirect);
         FF const val_ff = uint256_t::from_uint128(val);
@@ -220,7 +221,9 @@ class AvmMemOpcodeTests : public ::testing::Test {
             EXPECT_THAT(mem_ind_a_row,
                         AllOf(MEM_ROW_FIELD_EQ(tag_err, 0),
                               MEM_ROW_FIELD_EQ(r_in_tag, static_cast<uint32_t>(AvmMemoryTag::U32)),
-                              MEM_ROW_FIELD_EQ(tag, static_cast<uint32_t>(AvmMemoryTag::U32)),
+                              MEM_ROW_FIELD_EQ(tag,
+                                               indirect_uninitialized ? static_cast<uint32_t>(AvmMemoryTag::U0)
+                                                                      : static_cast<uint32_t>(AvmMemoryTag::U32)),
                               MEM_ROW_FIELD_EQ(addr, src_offset),
                               MEM_ROW_FIELD_EQ(val, dir_src_offset),
                               MEM_ROW_FIELD_EQ(sel_resolve_ind_addr_a, 1)));
@@ -376,7 +379,7 @@ TEST_F(AvmMemOpcodeTests, indUninitializedValueMov)
     trace_builder.return_op(0, 0, 0);
     trace = trace_builder.finalize();
 
-    validate_mov_trace(true, 0, 2, 3, AvmMemoryTag::U0, 0, 1);
+    validate_mov_trace(true, 0, 2, 3, AvmMemoryTag::U0, 0, 1, true);
 }
 
 TEST_F(AvmMemOpcodeTests, indirectMov)