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util: Use same method to clear bits in u_foreach_bit as util_bitcount

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   text	   data	    bss	    dec	    hex	filename
24817485	 456164	  27080	25300729	1820ef9	./lib64/libvulkan_intel.so

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24815381	 456164	  27080	25298625	18206c1	./lib64/libvulkan_intel.so

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/40230>
This commit is contained in:
Ian Romanick 2026-03-10 11:07:23 -07:00 • committed by Marge Bot
parent e13565acf4
commit d038bfa1c1
1 changed files with 7 additions and 5 deletions
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12
src/util/bitscan.h
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@ -106,10 +106,11 @@ u_bit_scan(unsigned *mask)
return i;
}
#define u_foreach_bit(b, dword) \
#define u_foreach_bit(b, dword) \
for (uint32_t __dword = (dword), b; \
((b) = ffs(__dword) - 1, __dword); \
__dword &= ~(1 << (b)))
((b) = ffs(__dword) - 1, __dword); \
/* See util_bitcount below. */ \
__dword &= __dword - 1)
static inline int
u_bit_scan64(uint64_t *mask)
@ -121,8 +122,9 @@ u_bit_scan64(uint64_t *mask)
#define u_foreach_bit64(b, dword) \
for (uint64_t __dword = (dword), b; \
((b) = ffsll(__dword) - 1, __dword); \
__dword &= ~(1ull << (b)))
((b) = ffsll(__dword) - 1, __dword); \
/* See util_bitcount below. */ \
__dword &= __dword - 1)
/* Given two bitmasks, loop over all bits of both of them.
* Bits of mask1 are: b = scan_bit(mask1);