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@codeflash-ai codeflash-ai bot commented Jan 30, 2026

📄 5% (0.05x) speedup for bit_lscan in aerospike_helpers/operations/bitwise_operations.py

⏱️ Runtime : 1.73 milliseconds 1.65 milliseconds (best of 5 runs)

📝 Explanation and details

The optimization achieves a 5% runtime improvement by eliminating redundant attribute lookups during dictionary construction.

Key Change:
The code now caches aerospike.OP_BIT_LSCAN as a module-level constant _BIT_LSCAN_OP instead of performing an attribute lookup on the aerospike module every time bit_lscan() is called.

Why This Improves Performance:
In Python, attribute access (aerospike.OP_BIT_LSCAN) involves a dictionary lookup on the module's namespace. By storing this constant once at module initialization, we avoid repeating this lookup cost on every function invocation. The line profiler results confirm this: the line assigning the OP_KEY dropped from 2.55ms to 2.42ms (a ~5% improvement on that specific line).

Impact Analysis:

  • Best for high-frequency scenarios: The annotated tests show consistent 4-7% improvements across most test cases, with some reaching up to 15% faster (e.g., test_bit_lscan_bin_name_preserved)
  • Particularly effective in batch operations: Tests creating 100-1000 operations show cumulative benefits (e.g., test_bit_lscan_many_bins_same_params improved from 195μs to 186μs)
  • Negligible downside: The optimization introduces no behavioral changes and maintains identical output

Since bit_lscan() constructs operation dictionaries that are passed to Aerospike client methods, any code path that frequently builds bitwise operations will benefit from this micro-optimization. The improvement scales linearly with call frequency, making it especially valuable in performance-critical data processing pipelines.

Correctness verification report:

Test Status
⚙️ Existing Unit Tests 139 Passed
🌀 Generated Regression Tests 4400 Passed
⏪ Replay Tests 🔘 None Found
🔎 Concolic Coverage Tests 🔘 None Found
📊 Tests Coverage 100.0%
⚙️ Click to see Existing Unit Tests
Test File::Test Function Original ⏱️ Optimized ⏱️ Speedup
test_bitwise_operations.py::TestBitwiseOperations.test_bit_lscan 1.69μs 1.51μs 12.1%✅
test_bitwise_operations.py::TestBitwiseOperations.test_bit_lscan_across_bytes 1.62μs 1.50μs 8.09%✅
test_bitwise_operations.py::TestBitwiseOperations.test_bit_lscan_bad_bin_name 1.48μs 1.42μs 4.58%✅
test_bitwise_operations.py::TestBitwiseOperations.test_bit_lscan_bit_size_too_large 1.47μs 1.42μs 2.95%✅
test_bitwise_operations.py::TestBitwiseOperations.test_bit_lscan_offset_out_of_range 1.51μs 1.36μs 11.5%✅
test_bitwise_operations.py::TestBitwiseOperations.test_bit_lscan_value_not_found 1.51μs 1.43μs 6.32%✅
🌀 Click to see Generated Regression Tests
import aerospike
import pytest
from aerospike_helpers.operations.bitwise_operations import bit_lscan

class TestBitLscanBasic:
    """Basic functionality tests for bit_lscan function."""
    
    def test_bit_lscan_returns_dict(self):
        """Test that bit_lscan returns a dictionary."""
        codeflash_output = bit_lscan("test_bin", 0, 8, True); result = codeflash_output # 1.67μs -> 1.55μs (7.47% faster)
    
    def test_bit_lscan_has_required_keys(self):
        """Test that returned dictionary contains all required keys."""
        codeflash_output = bit_lscan("test_bin", 0, 8, True); result = codeflash_output # 1.49μs -> 1.43μs (4.19% faster)
        required_keys = {"op", "bin", "bit_offset", "bit_size", "value"}
    
    def test_bit_lscan_op_value_is_correct(self):
        """Test that the operation type is OP_BIT_LSCAN."""
        codeflash_output = bit_lscan("test_bin", 0, 8, True); result = codeflash_output # 1.56μs -> 1.46μs (7.28% faster)
    
    def test_bit_lscan_bin_name_preserved(self):
        """Test that bin name is correctly stored in the operation."""
        bin_name = "my_test_bin"
        codeflash_output = bit_lscan(bin_name, 0, 8, True); result = codeflash_output # 1.63μs -> 1.41μs (15.7% faster)
    
    def test_bit_lscan_bit_offset_preserved(self):
        """Test that bit_offset is correctly stored in the operation."""
        codeflash_output = bit_lscan("test_bin", 5, 8, True); result = codeflash_output # 1.44μs -> 1.35μs (7.04% faster)
    
    def test_bit_lscan_bit_size_preserved(self):
        """Test that bit_size is correctly stored in the operation."""
        codeflash_output = bit_lscan("test_bin", 0, 16, True); result = codeflash_output # 1.53μs -> 1.43μs (7.16% faster)
    
    def test_bit_lscan_value_true(self):
        """Test that value True is correctly stored in the operation."""
        codeflash_output = bit_lscan("test_bin", 0, 8, True); result = codeflash_output # 1.45μs -> 1.43μs (1.61% faster)
    
    def test_bit_lscan_value_false(self):
        """Test that value False is correctly stored in the operation."""
        codeflash_output = bit_lscan("test_bin", 0, 8, False); result = codeflash_output # 1.52μs -> 1.44μs (6.13% faster)
    
    def test_bit_lscan_simple_scenario_one(self):
        """Test simple scenario with small bit offset and size."""
        codeflash_output = bit_lscan("data", 0, 4, True); result = codeflash_output # 1.55μs -> 1.37μs (12.6% faster)
    
    def test_bit_lscan_simple_scenario_two(self):
        """Test simple scenario with different parameters."""
        codeflash_output = bit_lscan("flags", 8, 32, False); result = codeflash_output # 1.54μs -> 1.44μs (7.07% faster)

class TestBitLscanEdgeCases:
    """Edge case tests for bit_lscan function."""
    
    def test_bit_lscan_zero_offset(self):
        """Test with zero bit offset."""
        codeflash_output = bit_lscan("bin", 0, 8, True); result = codeflash_output # 1.52μs -> 1.49μs (2.15% faster)
    
    def test_bit_lscan_zero_size(self):
        """Test with zero bit size."""
        codeflash_output = bit_lscan("bin", 0, 0, True); result = codeflash_output # 1.57μs -> 1.53μs (3.01% faster)
    
    def test_bit_lscan_large_offset(self):
        """Test with large bit offset value."""
        codeflash_output = bit_lscan("bin", 1000000, 8, True); result = codeflash_output # 1.51μs -> 1.46μs (3.42% faster)
    
    def test_bit_lscan_large_size(self):
        """Test with large bit size value."""
        codeflash_output = bit_lscan("bin", 0, 1000000, True); result = codeflash_output # 1.49μs -> 1.49μs (0.201% faster)
    
    def test_bit_lscan_both_large(self):
        """Test with both large offset and size."""
        codeflash_output = bit_lscan("bin", 500000, 500000, False); result = codeflash_output # 1.53μs -> 1.45μs (6.16% faster)
    
    def test_bit_lscan_empty_string_bin_name(self):
        """Test with empty string as bin name."""
        codeflash_output = bit_lscan("", 0, 8, True); result = codeflash_output # 1.38μs -> 1.45μs (4.50% slower)
    
    def test_bit_lscan_single_character_bin_name(self):
        """Test with single character bin name."""
        codeflash_output = bit_lscan("x", 0, 8, True); result = codeflash_output # 1.52μs -> 1.41μs (7.71% faster)
    
    def test_bit_lscan_special_characters_in_bin_name(self):
        """Test with special characters in bin name."""
        bin_name = "bin_with-special.chars@123"
        codeflash_output = bit_lscan(bin_name, 0, 8, True); result = codeflash_output # 1.53μs -> 1.39μs (10.3% faster)
    
    def test_bit_lscan_unicode_bin_name(self):
        """Test with unicode characters in bin name."""
        bin_name = "bin_\u00e9_accented"
        codeflash_output = bit_lscan(bin_name, 0, 8, True); result = codeflash_output # 1.48μs -> 1.39μs (6.42% faster)
    
    def test_bit_lscan_very_long_bin_name(self):
        """Test with very long bin name."""
        bin_name = "a" * 1000
        codeflash_output = bit_lscan(bin_name, 0, 8, True); result = codeflash_output # 1.54μs -> 1.48μs (4.05% faster)
    
    def test_bit_lscan_offset_equals_size(self):
        """Test when offset equals size."""
        codeflash_output = bit_lscan("bin", 100, 100, True); result = codeflash_output # 1.52μs -> 1.44μs (5.69% faster)
    
    def test_bit_lscan_negative_offset(self):
        """Test with negative bit offset (edge case for potential error handling)."""
        codeflash_output = bit_lscan("bin", -1, 8, True); result = codeflash_output # 1.49μs -> 1.42μs (4.86% faster)
    
    def test_bit_lscan_negative_size(self):
        """Test with negative bit size (edge case for potential error handling)."""
        codeflash_output = bit_lscan("bin", 0, -1, True); result = codeflash_output # 1.52μs -> 1.41μs (7.82% faster)
    
    def test_bit_lscan_negative_both(self):
        """Test with both negative offset and size."""
        codeflash_output = bit_lscan("bin", -10, -5, False); result = codeflash_output # 1.51μs -> 1.43μs (5.82% faster)
    
    def test_bit_lscan_max_int_offset(self):
        """Test with maximum integer value as offset."""
        max_int = 2147483647
        codeflash_output = bit_lscan("bin", max_int, 8, True); result = codeflash_output # 1.54μs -> 1.52μs (1.78% faster)
    
    def test_bit_lscan_max_int_size(self):
        """Test with maximum integer value as size."""
        max_int = 2147483647
        codeflash_output = bit_lscan("bin", 0, max_int, True); result = codeflash_output # 1.48μs -> 1.51μs (2.18% slower)

class TestBitLscanLargeScale:
    """Large scale tests for bit_lscan function performance and scalability."""
    
    def test_bit_lscan_batch_operations_creation(self):
        """Test creating multiple bit_lscan operations."""
        operations = []
        for i in range(100):
            codeflash_output = bit_lscan(f"bin_{i}", i * 10, i * 5 + 1, i % 2 == 0); op = codeflash_output # 42.3μs -> 40.3μs (4.90% faster)
            operations.append(op)
    
    def test_bit_lscan_many_bins_same_params(self):
        """Test creating operations for many different bins with same parameters."""
        results = []
        for i in range(500):
            codeflash_output = bit_lscan(f"data_bin_{i}", 0, 64, True); result = codeflash_output # 195μs -> 186μs (4.51% faster)
            results.append(result)
    
    def test_bit_lscan_varying_offsets(self):
        """Test with many different offset values."""
        results = []
        for offset in range(0, 1000, 10):
            codeflash_output = bit_lscan("bin", offset, 8, True); result = codeflash_output # 40.0μs -> 38.1μs (4.96% faster)
            results.append(result)
    
    def test_bit_lscan_varying_sizes(self):
        """Test with many different size values."""
        results = []
        for size in range(1, 1001):
            codeflash_output = bit_lscan("bin", 0, size, False); result = codeflash_output # 387μs -> 370μs (4.69% faster)
            results.append(result)
    
    def test_bit_lscan_alternating_values(self):
        """Test creating operations with alternating boolean values."""
        results = []
        for i in range(500):
            value = i % 2 == 0
            codeflash_output = bit_lscan("bin", i, 8, value); result = codeflash_output # 198μs -> 186μs (6.44% faster)
            results.append(result)
        # Verify alternating pattern
        for i in range(len(results)):
            pass
    
    def test_bit_lscan_consistent_dict_structure(self):
        """Test that all generated operations have consistent dictionary structure."""
        operations = []
        for i in range(100):
            codeflash_output = bit_lscan(f"bin_{i}", i, i + 1, i % 2 == 0); op = codeflash_output # 40.0μs -> 37.9μs (5.77% faster)
            operations.append(op)
        
        # Verify all operations have exactly the same keys
        first_keys = set(operations[0].keys())
        for op in operations[1:]:
            pass
    
    def test_bit_lscan_independence_of_operations(self):
        """Test that multiple operations are independent."""
        codeflash_output = bit_lscan("bin1", 10, 20, True); op1 = codeflash_output # 1.50μs -> 1.47μs (1.77% faster)
        codeflash_output = bit_lscan("bin2", 30, 40, False); op2 = codeflash_output # 532ns -> 607ns (12.4% slower)
        
        # Modify op1 to verify it doesn't affect op2
        op1["bin"] = "modified"
    
    def test_bit_lscan_repeated_calls_same_params(self):
        """Test repeated calls with identical parameters produce identical results."""
        results = []
        for _ in range(50):
            codeflash_output = bit_lscan("test_bin", 42, 64, True); result = codeflash_output # 20.5μs -> 19.2μs (6.80% faster)
            results.append(result)
        
        # All results should be equal
        for i in range(1, len(results)):
            pass
    
    def test_bit_lscan_stress_test_mixed_params(self):
        """Stress test with mixed parameter combinations."""
        count = 0
        for bin_num in range(10):
            for offset in range(0, 100, 10):
                for size in range(10, 110, 10):
                    for value in [True, False]:
                        codeflash_output = bit_lscan(f"bin_{bin_num}", offset, size, value); result = codeflash_output
                        count += 1

class TestBitLscanReturnTypeValidation:
    """Tests to validate the structure and type of returned dictionary."""
    
    def test_bit_lscan_return_type_is_dict(self):
        """Verify that return type is always a dictionary."""
        for i in range(20):
            codeflash_output = bit_lscan(f"bin_{i}", i, i + 1, i % 2 == 0); result = codeflash_output # 9.06μs -> 8.58μs (5.60% faster)
    
    def test_bit_lscan_dict_values_types(self):
        """Test that dictionary values have correct types."""
        codeflash_output = bit_lscan("test_bin", 100, 200, True); result = codeflash_output # 1.54μs -> 1.44μs (6.73% faster)
    
    def test_bit_lscan_op_constant_value(self):
        """Test that OP_BIT_LSCAN is the correct Aerospike constant."""
        codeflash_output = bit_lscan("bin", 0, 8, True); result = codeflash_output # 1.52μs -> 1.43μs (6.50% faster)
# codeflash_output is used to check that the output of the original code is the same as that of the optimized code.

To edit these changes git checkout codeflash/optimize-bit_lscan-ml0jp179 and push.

Codeflash Static Badge

The optimization achieves a **5% runtime improvement** by eliminating redundant attribute lookups during dictionary construction. 

**Key Change:**
The code now caches `aerospike.OP_BIT_LSCAN` as a module-level constant `_BIT_LSCAN_OP` instead of performing an attribute lookup on the `aerospike` module every time `bit_lscan()` is called.

**Why This Improves Performance:**
In Python, attribute access (`aerospike.OP_BIT_LSCAN`) involves a dictionary lookup on the module's namespace. By storing this constant once at module initialization, we avoid repeating this lookup cost on every function invocation. The line profiler results confirm this: the line assigning the `OP_KEY` dropped from 2.55ms to 2.42ms (a ~5% improvement on that specific line).

**Impact Analysis:**
- **Best for high-frequency scenarios**: The annotated tests show consistent 4-7% improvements across most test cases, with some reaching up to 15% faster (e.g., `test_bit_lscan_bin_name_preserved`)
- **Particularly effective in batch operations**: Tests creating 100-1000 operations show cumulative benefits (e.g., `test_bit_lscan_many_bins_same_params` improved from 195μs to 186μs)
- **Negligible downside**: The optimization introduces no behavioral changes and maintains identical output

Since `bit_lscan()` constructs operation dictionaries that are passed to Aerospike client methods, any code path that frequently builds bitwise operations will benefit from this micro-optimization. The improvement scales linearly with call frequency, making it especially valuable in performance-critical data processing pipelines.
@codeflash-ai codeflash-ai bot requested a review from aseembits93 January 30, 2026 07:12
@codeflash-ai codeflash-ai bot added ⚡️ codeflash Optimization PR opened by Codeflash AI 🎯 Quality: Medium Optimization Quality according to Codeflash labels Jan 30, 2026
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⚡️ codeflash Optimization PR opened by Codeflash AI 🎯 Quality: Medium Optimization Quality according to Codeflash

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