From: Denis Kenzior <denkenz@gmail.com>
To: ell@lists.linux.dev
Cc: Denis Kenzior <denkenz@gmail.com>
Subject: [PATCH v2 3/4] util: Add L_BITS_{SET|CLEAR}
Date: Tue, 16 Apr 2024 09:24:54 -0500 [thread overview]
Message-ID: <20240416142458.3353383-3-denkenz@gmail.com> (raw)
In-Reply-To: <20240416142458.3353383-1-denkenz@gmail.com>
These macros can set or clear an arbitrary number of bits in a single
call, as follows:
uint64_t bitmap = 0;
L_BITS_CLEAR(&bitmap, 0, 1, 5, 15, 32, 63);
---
ell/util.h | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/ell/util.h b/ell/util.h
index ed0bbe845656..346197771514 100644
--- a/ell/util.h
+++ b/ell/util.h
@@ -396,6 +396,20 @@ inline __attribute__((always_inline)) void _l_close_cleanup(void *p)
(*_offset & _L_BIT_TO_MASK(_offset, _nr)) != 0; \
})
+#define L_BITS_SET(bits, ...) __extension__ ({ \
+ const unsigned int __elems[] = {__VA_ARGS__}; \
+ size_t __i; \
+ for (__i = 0; __i < L_ARRAY_SIZE(__elems); __i++) \
+ L_BIT_SET(bits, __elems[__i]); \
+})
+
+#define L_BITS_CLEAR(bits, ...) __extension__ ({ \
+ const unsigned int __elems[] = {__VA_ARGS__}; \
+ size_t __i; \
+ for (__i = 0; __i < L_ARRAY_SIZE(__elems); __i++) \
+ L_BIT_CLEAR(bits, __elems[__i]); \
+})
+
/*
* Taken from https://github.com/chmike/cst_time_memcmp, adding a volatile to
* ensure the compiler does not try to optimize the constant time behavior.
--
2.44.0
next prev parent reply other threads:[~2024-04-16 14:25 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-16 14:24 [PATCH v2 1/4] util: Remove confusing static keyword use Denis Kenzior
2024-04-16 14:24 ` [PATCH v2 2/4] util: Add L_BIT_{SET|CLEAR|TEST} macros Denis Kenzior
2024-04-16 14:24 ` Denis Kenzior [this message]
2024-04-16 14:24 ` [PATCH v2 4/4] unit: Add tests for the new bitmap utilities Denis Kenzior
2024-04-16 19:07 ` [PATCH v2 1/4] util: Remove confusing static keyword use Denis Kenzior
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