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authorLuke T. Shumaker <lukeshu@lukeshu.com>2025-02-25 15:25:08 -0700
committerLuke T. Shumaker <lukeshu@lukeshu.com>2025-02-26 16:10:14 -0700
commite0a04cbc3d159a84a1aa845743a0b89981e16224 (patch)
tree96f9555da40d9731d6aa96a7431db752b8d293d8 /libmisc/include
parent66efca9146357621118d565359b91326d1a96d0a (diff)
libmisc: macro.h: Add LM_FLOORLOG2
Diffstat (limited to 'libmisc/include')
-rw-r--r--libmisc/include/libmisc/macro.h9
1 files changed, 5 insertions, 4 deletions
diff --git a/libmisc/include/libmisc/macro.h b/libmisc/include/libmisc/macro.h
index 149c4bb..b3e235c 100644
--- a/libmisc/include/libmisc/macro.h
+++ b/libmisc/include/libmisc/macro.h
@@ -17,10 +17,11 @@
/* numeric */
#define LM_ARRAY_LEN(ary) (sizeof(ary)/sizeof((ary)[0]))
-#define LM_CEILDIV(n, d) ( ((n)+(d)-1) / (d) )
-#define LM_ROUND_UP(n, d) ( LM_CEILDIV(n, d) * (d) ) /** Return `n` rounded up to the nearest multiple of `d` */
-#define LM_ROUND_DOWN(n, d) ( ((n)/(d)) * (d) ) /** Return `n` rounded down to the nearest multiple of `d` */
-#define LM_NEXT_POWER_OF_2(x) ( (x) ? 1ULL<<((sizeof(unsigned long long)*8)-__builtin_clzll(x)) : 1)
+#define LM_CEILDIV(n, d) ( ((n)+(d)-1) / (d) ) /** Return ceil(n/d) */
+#define LM_ROUND_UP(n, d) ( LM_CEILDIV(n, d) * (d) ) /** Return `n` rounded up to the nearest multiple of `d` */
+#define LM_ROUND_DOWN(n, d) ( ((n)/(d)) * (d) ) /** Return `n` rounded down to the nearest multiple of `d` */
+#define LM_NEXT_POWER_OF_2(x) ( (x) ? 1ULL<<((sizeof(unsigned long long)*8)-__builtin_clzll(x)) : 1) /** Return the lowest power of 2 that is > x */
+#define LM_FLOORLOG2(x) ((sizeof(unsigned long long)*8)-__builtin_clzll(x)-1) /** Return floor(log_2(x) */
/* strings */