mirrors/postgres
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Remove newly added asserts from pg_bitutils.h

Browse Source 
These were valuable during development, but are unlikely to tell us
anything going forward. This reverts 204b0cbec and adjusts the content
of 677319746 to more closely match the more-readable original style.

Per review from Tom Lane

Discussion: https://www.postgresql.org/message-id/3567481.1676906261%40sss.pgh.pa.us
This commit is contained in:
John Naylor 2023-02-22 17:22:43 +07:00
parent e00bc6c922
commit 83a611a259
1 changed files with 59 additions and 107 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

166
src/include/port/pg_bitutils.h
View File

@ -41,14 +41,17 @@ static inline int
pg_leftmost_one_pos32(uint32 word)
{
#ifdef HAVE__BUILTIN_CLZ
int bitscan_result;
#elif defined(_MSC_VER)
unsigned long bitscan_result;
bool non_zero;
#endif
Assert(word != 0);
#if !defined(HAVE_BITSCAN_REVERSE) || defined(USE_ASSERT_CHECKING)
int result;
return 31 - __builtin_clz(word);
#elif defined(_MSC_VER)
unsigned long result;
bool non_zero;
non_zero = _BitScanReverse(&result, word);
Assert(non_zero);
return (int) result;
#else
int shift = 32 - 8;
Assert(word != 0);
@ -56,23 +59,8 @@ pg_leftmost_one_pos32(uint32 word)
while ((word >> shift) == 0)
shift -= 8;
result = shift + pg_leftmost_one_pos[(word >> shift) & 255];
#endif
#ifdef HAVE_BITSCAN_REVERSE
#if defined(HAVE__BUILTIN_CLZ)
bitscan_result = 31 - __builtin_clz(word);
#elif defined(_MSC_VER)
non_zero = _BitScanReverse(&bitscan_result, word);
Assert(non_zero);
#endif
Assert(bitscan_result == result);
return bitscan_result;
#else
return result;
#endif /* HAVE_BITSCAN_REVERSE */
return shift + pg_leftmost_one_pos[(word >> shift) & 255];
#endif /* HAVE__BUILTIN_CLZ */
}
/*
@ -83,14 +71,24 @@ static inline int
pg_leftmost_one_pos64(uint64 word)
{
#ifdef HAVE__BUILTIN_CLZ
int bitscan_result;
#elif defined(_MSC_VER)
unsigned long bitscan_result;
bool non_zero;
#endif
Assert(word != 0);
#if !defined(HAVE_BITSCAN_REVERSE) || defined(USE_ASSERT_CHECKING)
int result;
#if defined(HAVE_LONG_INT_64)
return 63 - __builtin_clzl(word);
#elif defined(HAVE_LONG_LONG_INT_64)
return 63 - __builtin_clzll(word);
#else
#error must have a working 64-bit integer datatype
#endif /* HAVE_LONG_INT_64 */
#elif defined(_MSC_VER)
unsigned long result;
bool non_zero;
non_zero = _BitScanReverse64(&result, word);
Assert(non_zero);
return (int) result;
#else
int shift = 64 - 8;
Assert(word != 0);
@ -98,30 +96,8 @@ pg_leftmost_one_pos64(uint64 word)
while ((word >> shift) == 0)
shift -= 8;
result = shift + pg_leftmost_one_pos[(word >> shift) & 255];
#endif
#ifdef HAVE_BITSCAN_REVERSE
#if defined(HAVE__BUILTIN_CLZ)
#if defined(HAVE_LONG_INT_64)
bitscan_result = 63 - __builtin_clzl(word);
#elif defined(HAVE_LONG_LONG_INT_64)
bitscan_result = 63 - __builtin_clzll(word);
#else
#error must have a working 64-bit integer datatype
#endif /* HAVE_LONG_INT_64 */
#elif defined(_MSC_VER)
non_zero = _BitScanReverse64(&bitscan_result, word);
Assert(non_zero);
return shift + pg_leftmost_one_pos[(word >> shift) & 255];
#endif /* HAVE__BUILTIN_CLZ */
Assert(bitscan_result == result);
return bitscan_result;
#else
return result;
#endif /* HAVE_BITSCAN_REVERSE */
}
/*
@ -133,15 +109,17 @@ static inline int
pg_rightmost_one_pos32(uint32 word)
{
#ifdef HAVE__BUILTIN_CTZ
const uint32 orig_word = word;
int bitscan_result;
#elif defined(_MSC_VER)
const unsigned long orig_word = word;
unsigned long bitscan_result;
bool non_zero;
#endif
Assert(word != 0);
#if !defined(HAVE_BITSCAN_FORWARD) || defined(USE_ASSERT_CHECKING)
return __builtin_ctz(word);
#elif defined(_MSC_VER)
unsigned long result;
bool non_zero;
non_zero = _BitScanForward(&result, word);
Assert(non_zero);
return (int) result;
#else
int result = 0;
Assert(word != 0);
@ -152,22 +130,8 @@ pg_rightmost_one_pos32(uint32 word)
result += 8;
}
result += pg_rightmost_one_pos[word & 255];
#endif
#ifdef HAVE_BITSCAN_FORWARD
#if defined(HAVE__BUILTIN_CTZ)
bitscan_result = __builtin_ctz(orig_word);
#elif defined(_MSC_VER)
non_zero = _BitScanForward(&bitscan_result, orig_word);
Assert(non_zero);
#endif
Assert(bitscan_result == result);
return bitscan_result;
#else
return result;
#endif /* HAVE_BITSCAN_FORWARD */
#endif /* HAVE__BUILTIN_CTZ */
}
/*
@ -178,15 +142,24 @@ static inline int
pg_rightmost_one_pos64(uint64 word)
{
#ifdef HAVE__BUILTIN_CTZ
const uint64 orig_word = word;
int bitscan_result;
#elif defined(_MSC_VER)
const unsigned __int64 orig_word = word;
unsigned long bitscan_result;
bool non_zero;
#endif
Assert(word != 0);
#if !defined(HAVE_BITSCAN_FORWARD) || defined(USE_ASSERT_CHECKING)
#if defined(HAVE_LONG_INT_64)
return __builtin_ctzl(word);
#elif defined(HAVE_LONG_LONG_INT_64)
return __builtin_ctzll(word);
#else
#error must have a working 64-bit integer datatype
#endif /* HAVE_LONG_INT_64 */
#elif defined(_MSC_VER)
unsigned long result;
bool non_zero;
non_zero = _BitScanForward64(&result, word);
Assert(non_zero);
return (int) result;
#else
int result = 0;
Assert(word != 0);
@ -197,29 +170,8 @@ pg_rightmost_one_pos64(uint64 word)
result += 8;
}
result += pg_rightmost_one_pos[word & 255];
#endif
#ifdef HAVE_BITSCAN_FORWARD
#if defined(HAVE__BUILTIN_CTZ)
#if defined(HAVE_LONG_INT_64)
bitscan_result = __builtin_ctzl(orig_word);
#elif defined(HAVE_LONG_LONG_INT_64)
bitscan_result = __builtin_ctzll(orig_word);
#else
#error must have a working 64-bit integer datatype
#endif /* HAVE_LONG_INT_64 */
#elif defined(_MSC_VER)
non_zero = _BitScanForward64(&bitscan_result, orig_word);
Assert(non_zero);
#endif /* HAVE__BUILTIN_CTZ */
Assert(bitscan_result == result);
return bitscan_result;
#else
return result;
#endif /* HAVE_BITSCAN_FORWARD */
#endif /* HAVE__BUILTIN_CTZ */
}
/*