nx_x86_64_arith_test.nx

nx_x86_64_arith_test.nx -- session 4 smoke for mul/div/shift/bitwise. Computes ((7 * 6) - 30) / 4 = 3 entirely on the x86_64 stack machine, ASCII-encodes the result (0x30 + 3 = '3') and writes one byte to stdout. Validates imulq + subq + cqo + idivq. Then ALSO does: (0xFF & 0x0F) | 0x40 = 0x4F = 'O' -- and/or (5 ^ 3) << 1 = 12 -> '<' -- xor/shlq_imm not(~0xFFFFFFFFFFFFFFFB) = 5 -> '5' -- notq + neg But the SMOKE asserts ONLY the first one to keep things minimal. Stdout: "3" (one byte 0x33).