On Sunday 06 April 2025 14:10:35 Pali Rohár wrote:
> It mimics msvc _aligned_msize() function.
> ---
> mingw-w64-crt/misc/mingw-aligned-malloc.c | 23 +++++++++++++++++++++++
> mingw-w64-headers/crt/malloc.h | 1 +
> 2 files changed, 24 insertions(+)
>
> diff --git a/mingw-w64-crt/misc/mingw-aligned-malloc.c
> b/mingw-w64-crt/misc/mingw-aligned-malloc.c
> index 5029b6007842..d376a103a55f 100644
> --- a/mingw-w64-crt/misc/mingw-aligned-malloc.c
> +++ b/mingw-w64-crt/misc/mingw-aligned-malloc.c
> @@ -118,3 +118,26 @@ __mingw_aligned_realloc (void *memblock, size_t size,
> size_t alignment)
> {
> return __mingw_aligned_offset_realloc (memblock, size, alignment, 0);
> }
> +
> +size_t
> +__mingw_aligned_msize (void *memblock, size_t alignment, size_t offset)
> +{
> + void *p0;
> +
> + if (!memblock || NOT_POWER_OF_TWO (alignment))
> + {
> + errno = EINVAL;
> + return (size_t)-1;
> + }
> +
> + p0 = ORIG_PTR (memblock);
> +
> + /* It is an error if the alignment or offset does not match. */
> + if (memblock != PTR_ALIGN (p0, alignment, offset))
> + {
> + errno = EINVAL;
> + return (size_t)-1;
> + }
> +
> + return _msize (p0) - (alignment + sizeof (void *));
> +}
> diff --git a/mingw-w64-headers/crt/malloc.h b/mingw-w64-headers/crt/malloc.h
> index 78d67dd2eeb4..52918782bf8c 100644
> --- a/mingw-w64-headers/crt/malloc.h
> +++ b/mingw-w64-headers/crt/malloc.h
> @@ -133,6 +133,7 @@ void __mingw_aligned_free (void *_Memory);
> void * __mingw_aligned_offset_realloc (void *_Memory, size_t _Size, size_t
> _Alignment, size_t _Offset);
> void * __mingw_aligned_offset_malloc (size_t, size_t, size_t);
> void * __mingw_aligned_realloc (void *_Memory, size_t _Size, size_t _Offset);
> +size_t __mingw_aligned_msize (void *memblock, size_t alignment, size_t
> offset);
>
> #if defined(__x86_64__) || defined(__i386__)
> /* Get the compiler's definition of _mm_malloc and _mm_free. */
> --
> 2.20.1
>
I was doing another round of testing and I have figured out that this
__mingw_aligned_msize is not compatible with msvcrt.dll. There are two
problems: off-by-one error and incorrect handling of alignment less than
pointer size.
One I fix these problems, I will send a new version.
Sorry for troubles.
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