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authorTavian Barnes <tavianator@tavianator.com>2023-11-11 13:46:21 -0500
committerTavian Barnes <tavianator@tavianator.com>2023-11-11 13:47:00 -0500
commit56e35928daaec12c97ccc4707546f669db1d909d (patch)
tree9db552bd2e1f69a96dfaaee4c215b0ed4f87b4f0 /src
parent640fa83406bb8c08d971be68b32b7e222e92e286 (diff)
downloadbfs-56e35928daaec12c97ccc4707546f669db1d909d.tar.xz
Revert "bit: Implement a branchless has_single_bit()"
Doesn't work for the highest bit due to overflow. This reverts commit 208376ef99da243545efcd6fb02d3469b4c068ed.
Diffstat (limited to 'src')
-rw-r--r--src/bit.h3
1 files changed, 1 insertions, 2 deletions
diff --git a/src/bit.h b/src/bit.h
index e680fed..21a8076 100644
--- a/src/bit.h
+++ b/src/bit.h
@@ -350,8 +350,7 @@ UINT_OVERLOADS(FIRST_TRAILING_ONE)
#define HAS_SINGLE_BIT(type, suffix, width) \
static inline bool has_single_bit##suffix(type n) { \
- /** Branchless n && !(n & (n - 1)) */ \
- return n < (n ^ (n - 1)) + 1; \
+ return n && !(n & (n - 1)); \
}
UINT_OVERLOADS(ROTATE_LEFT)