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| author | Ivan Maidanski <ivmai@mail.ru> | 2023-05-02 08:40:38 +0300 |
|---|---|---|
| committer | Ivan Maidanski <ivmai@mail.ru> | 2023-05-02 11:41:39 +0300 |
| commit | 3af192338fa46b8cd8300eccbcf3a699f84b30f8 (patch) | |
| tree | 4cf91859eb28cd3a7006c183cd9614799692abb6 /alloc.c | |
| parent | acb364c8490ed0d410084c6d8c534e6dd36abacb (diff) | |
| download | bdwgc-3af192338fa46b8cd8300eccbcf3a699f84b30f8.tar.gz | |
Do not use integer division in GC_soft_read_dirty
An integer division operation might be slow on some CPU architectures.
It should be replaced with a shift operation where possible.
The SOFT_VDB algorithm used division and multiplication by the page size.
* os_dep.c [SOFT_VDB] (GC_log_pagesize): Define STATIC variable.
* os_dep.c (GC_setpagesize): Define in a single place (for Win32 and
non-Win32 cases).
* os_dep.c [SOFT_VDB] (os2_getpagesize): Define pgsize and log_pgsize
local variables; compute GC_log_pagesize value.
* os_dep.c [SOFT_VDB] (detect_soft_dirty_supported,
soft_set_grungy_pages): Check GC_log_pagesize instead of GC_page_size
in assertion; use shift by GC_log_pagesize instead of division (and
multiplication) by GC_page_size.
* os_dep.c [SOFT_VDB] (pagemap_buffered_read): Add assertion that
GC_page_size is non-zero.
Diffstat (limited to 'alloc.c')
0 files changed, 0 insertions, 0 deletions