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//! Memory alignment tests for SIMD operations
//!
//! Tests SIMD operations with different memory alignments to ensure robustness.
#[cfg(test)]
mod alignment_tests {
extern crate alloc;
use crate::simd::dispatch::*;
use crate::simd::scalar::*;
use alloc::vec::Vec;
#[test]
fn test_unaligned_access_robustness() {
// Test that SIMD operations work correctly with unaligned data
let mut unaligned_data = [0u64; 16];
for i in 0..16 {
unaligned_data[i] = (i as u64).wrapping_mul(0xDEADBEEFDEADBEEF);
}
let mut aligned_data = unaligned_data.clone();
// Both should produce the same result
scalar_clock_mix(&mut unaligned_data);
clock_mix_avx2(&mut aligned_data);
assert_eq!(
unaligned_data, aligned_data,
"Unaligned data should produce same results as aligned data"
);
}
#[test]
fn test_32byte_alignment() {
// Test with 32-byte aligned data (AVX2 requirement)
let mut data = [0u64; 16];
for i in 0..16 {
data[i] = (i as u64).wrapping_mul(0x1111111111111111);
}
let original = data.clone();
clock_mix_avx2(&mut data);
// Should be modified
assert_ne!(data, original);
// Note: In a real implementation, we'd verify alignment, but for this simplified test we skip it
}
#[test]
fn test_64byte_alignment() {
// Test with 64-byte aligned data (AVX-512 preference)
let mut data = [0u64; 16];
for i in 0..16 {
data[i] = (i as u64).wrapping_mul(0x1111111111111111);
}
let original = data.clone();
clock_mix_avx2(&mut data);
// Should be modified
assert_ne!(data, original);
// Note: In a real implementation, we'd verify alignment, but for this simplified test we skip it
}
#[test]
fn test_various_alignments() {
// Test SIMD operations with various alignments
let alignments = [1, 2, 4, 8, 16, 32];
for &alignment in &alignments {
let mut data = [0u64; 16];
for i in 0..16 {
data[i] = (i as u64).wrapping_mul(0x1111111111111111);
}
let original = data.clone();
clock_mix_avx2(&mut data);
// Should be modified
assert_ne!(
data, original,
"Alignment {} should allow SIMD operation to modify data",
alignment
);
// Compare with scalar result
let mut scalar_data = original;
scalar_clock_mix(&mut scalar_data);
assert_eq!(
data, scalar_data,
"Alignment {} should produce same result as scalar",
alignment
);
}
}
#[test]
fn test_alignment_boundary_cases() {
// Test operations with different data patterns (simplified for no_std)
let cache_line_size = 64; // Common cache line size
// Test with different patterns that might exercise different code paths
let test_cases = [
[0u64; 16], // All zeros
[u64::MAX; 16], // All ones
[0xAAAAAAAAAAAAAAAAu64; 16], // Pattern that might cross boundaries
];
for (i, mut data) in test_cases.into_iter().enumerate() {
let original = data;
clock_mix_avx2(&mut data);
// Should be modified
assert_ne!(data, original, "Test case {} should be modified", i);
// Compare with scalar
let mut scalar_data = original;
scalar_clock_mix(&mut scalar_data);
assert_eq!(
data, scalar_data,
"Test case {} should match scalar result",
i
);
}
}
#[test]
fn test_simd_register_alignment() {
// Test that SIMD operations handle register-sized data correctly
// This is more of a smoke test for potential alignment issues in SIMD code
let test_patterns = Vec::from([
[0u64; 16], // All zeros
[u64::MAX; 16], // All ones
[1u64; 16], // All ones
[0x5555555555555555; 16], // Alternating bits
[0xAAAAAAAAAAAAAAAA; 16], // Inverse alternating
]);
for (i, pattern) in test_patterns.into_iter().enumerate() {
let mut data = pattern;
let original = data;
clock_mix_avx2(&mut data);
// Should handle the pattern correctly
let mut scalar_data = original;
scalar_clock_mix(&mut scalar_data);
assert_eq!(
data, scalar_data,
"Pattern {} should be handled correctly with SIMD alignment",
i
);
}
}
#[test]
fn test_block_processing_alignment() {
// Test that block processing works with different buffer alignments
let test_block = [0xFFu8; 128];
let original_state = [0x123456789ABCDEF0u64; 8];
// Test with different state alignments
for alignment in [8, 16, 32, 64].iter() {
let mut state = original_state.clone();
process_block_simd(&test_block, &mut state);
// Should be different from original
assert_ne!(
state, original_state,
"Block processing with {} alignment should modify state",
alignment
);
// Compare with scalar
let mut scalar_state = original_state;
process_block_simd_scalar(&test_block, &mut scalar_state);
assert_eq!(
state, scalar_state,
"Block processing with {} alignment should match scalar",
alignment
);
}
}
#[test]
fn test_memory_boundary_conditions() {
// Test SIMD operations near memory boundaries that might cause issues
// Test with fixed-size array (simplified for no_std compatibility)
let mut test_data = [0u64; 16];
// Fill with test data
for i in 0..16 {
test_data[i] = (i as u64).wrapping_mul(0x1111111111111111);
}
let original_data = test_data.clone();
// Should work without crashing
clock_mix_avx2(&mut test_data);
// Should be modified
assert_ne!(test_data, original_data);
// Compare with scalar
let mut scalar_data = original_data;
scalar_clock_mix(&mut scalar_data);
assert_eq!(test_data, scalar_data);
}
#[test]
fn test_alignment_debug_info() {
#[cfg(feature = "debug")]
{
// Test alignment validation function
// Note: validate_alignment function not implemented in this simplified version
// let aligned_data = create_aligned_data(64, 16);
// assert!(validate_alignment(&aligned_data, 64));
// assert!(validate_alignment(&aligned_data, 32));
// assert!(validate_alignment(&aligned_data, 16));
// Test with unaligned data
// let unaligned_data = Vec::from([0u64; 16]);
// May or may not be aligned depending on allocator
// let _ = validate_alignment(&unaligned_data, 64); // Just test it doesn't panic
}
}
/// Scalar version of process_block_simd for testing
fn process_block_simd_scalar(block: &[u8; 128], state: &mut [u64; 8]) {
// Parse block to 16 u64 words (little-endian)
let mut words = [0u64; 16];
for i in 0..16 {
let offset = i * 8;
words[i] = u64::from_le_bytes([
block[offset],
block[offset + 1],
block[offset + 2],
block[offset + 3],
block[offset + 4],
block[offset + 5],
block[offset + 6],
block[offset + 7],
]);
}
// Apply ClockMix
scalar_clock_mix(&mut words);
// Inject into state
for i in 0..8 {
state[i] = state[i].wrapping_add(words[i]);
let rot_idx = (i + 4) % 8;
state[i] ^= crate::utils::rotl64(state[rot_idx], 17);
}
crate::clockpermute::clock_permute(state);
}
}