zanmato1984 commented on code in PR #48180:
URL: https://github.com/apache/arrow/pull/48180#discussion_r2603002807
##########
cpp/src/arrow/compute/util.cc:
##########
@@ -118,7 +124,22 @@ void bits_to_indexes_internal(int64_t hardware_flags,
const int num_bits,
// Optionally process the last partial word with masking out bits outside
range
if (tail) {
const uint8_t* bits_tail = bits + (num_bits - tail) / 8;
+#if ARROW_LITTLE_ENDIAN
uint64_t word = SafeLoadUpTo8Bytes(bits_tail, (tail + 7) / 8);
+#else
+ int tail_bytes = (tail + 7) / 8;
+ uint64_t word;
+ if (tail_bytes == 8) {
+ word = util::SafeLoad(reinterpret_cast<const uint64_t*>(bits_tail));
+ } else {
+ // For bit manipulation, always load into least significant bits
+ // to ensure compatibility with CountTrailingZeros on Big-endian systems
+ word = 0;
+ for (int i = 0; i < tail_bytes; ++i) {
+ word |= static_cast<uint64_t>(bits_tail[i]) << (8 * i);
+ }
+ }
+#endif
Review Comment:
Hi @Vishwanatha-HD , I guess that test
KeyCompare.CompareColumnsToRowsCuriousFSB would still fail even w/o the change
I proposed. The fact that it is failing means it is calling
`SafeLoadUpTo8Bytes`, which is supposed to be a `DCHECK` failure. Your change
of removing that `DCHECK`, which is against its by-design intention, makes it
passing false-positively.
Meanwhile, do you see other tests failing with the change I proposed?
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