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Don't use _BitScanForward64/_BitScanReverse64 on 32-bit MSVC builds

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677319746 added support for making use of MSVC's bit scanning functions.
However, that commit failed to consider 32-bit MSVC builds where the
64-bit versions of these functions are unavailable.  This resulted in
compilation failures on 32-bit MSVC.

Here we adjust the code so we fall back on the manual way of finding the
bit positions for 64-bit integers when building on 32-bit MSVC.

Bug: #17967
Reported-by: Youmiu Mo
Discussion: https://postgr.es/m/17967-cd21e34a314141b2@postgresql.org
This commit is contained in:
David Rowley 2023-06-08 10:10:34 +12:00
parent f24523672d
commit 53ea2b7ad0
1 changed files with 2 additions and 2 deletions
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4
src/include/port/pg_bitutils.h
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@ -81,7 +81,7 @@ pg_leftmost_one_pos64(uint64 word)
#error must have a working 64-bit integer datatype #error must have a working 64-bit integer datatype
#endif /* HAVE_LONG_INT_64 */ #endif /* HAVE_LONG_INT_64 */
#elif defined(_MSC_VER) #elif defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_ARM64))
unsigned long result; unsigned long result;
bool non_zero; bool non_zero;
@ -152,7 +152,7 @@ pg_rightmost_one_pos64(uint64 word)
#error must have a working 64-bit integer datatype #error must have a working 64-bit integer datatype
#endif /* HAVE_LONG_INT_64 */ #endif /* HAVE_LONG_INT_64 */
#elif defined(_MSC_VER) #elif defined(_MSC_VER) && (defined(_M_AMD64) || defined(_M_ARM64))
unsigned long result; unsigned long result;
bool non_zero; bool non_zero;