aco: disallow SDWA for instructions with 64-bit definitions/operands

For example, v_cvt_f64_i32. LLVM doesn't seem to allow this either and it
doesn't seem to work correctly.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/3151>

src/amd/compiler/aco_ir.cpp

@@ -228,11 +228,18 @@ bool can_use_SDWA(chip_class chip, const aco_ptr<Instruction>& instr)
       }
    }
 
+   if (!instr->definitions.empty() && instr->definitions[0].bytes() > 4)
+      return false;
+
    if (!instr->operands.empty()) {
       if (instr->operands[0].isLiteral())
          return false;
       if (chip < GFX9 && !instr->operands[0].isOfType(RegType::vgpr))
          return false;
+      if (instr->operands[0].bytes() > 4)
+         return false;
+      if (instr->operands.size() > 1 && instr->operands[1].bytes() > 4)
+         return false;
    }
 
    bool is_mac = instr->opcode == aco_opcode::v_mac_f32 ||