HappenLee commented on code in PR #35394:
URL: https://github.com/apache/doris/pull/35394#discussion_r1616547713
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be/src/util/frame_of_reference_coding.h:
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@@ -34,9 +34,13 @@ inline uint8_t bits_less_than_64(const uint64_t v) {
// See
https://stackoverflow.com/questions/28423405/counting-the-number-of-leading-zeros-in-a-128-bit-integer
inline uint8_t bits_may_more_than_64(const uint128_t v) {
+ // See
https://stackoverflow.com/questions/49580083/builtin-clz-returns-incorrect-value-for-input-zero
+ if (v == 0) {
+ return 0;
+ }
uint64_t hi = v >> 64;
uint64_t lo = v;
- int z[3] = {__builtin_clzll(hi), __builtin_clzll(lo) + 64, 128};
+ int z[3] = {hi == 0 ? 64 : __builtin_clzll(hi), (lo == 0 ? 64 :
__builtin_clzll(lo)) + 64, 128};
Review Comment:
should be an inline function __builtin_clzll
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