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malloc: Improve csize2tidx 

Remove the alignment rounding up from csize2tidx - this makes no sense
since the input should be a chunk size.  Removing it enables further
optimizations, for example chunksize_nomask can be safely used and
invalid sizes < MINSIZE are not mapped to a valid tidx.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>
This commit is contained in:
Wilco Dijkstra 2025-03-18 12:14:52 +00:00
parent 5291d9f1e2
commit 575de3d666
1 changed files with 1 additions and 1 deletions
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2
malloc/malloc.c
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@ -298,7 +298,7 @@
# define tidx2usize(idx) (((size_t) idx) * MALLOC_ALIGNMENT + MINSIZE - SIZE_SZ)
/* When "x" is from chunksize(). */
# define csize2tidx(x) (((x) - MINSIZE + MALLOC_ALIGNMENT - 1) / MALLOC_ALIGNMENT)
# define csize2tidx(x) (((x) - MINSIZE) / MALLOC_ALIGNMENT)
/* When "x" is a user-provided size. */
# define usize2tidx(x) csize2tidx (request2size (x))