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util/ralloc: add HEADER_ALIGN macro

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Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Jason Ekstrand <jason.ekstrand@collabora.com>
Reviewed-by: Emma Anholt <emma@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/12910>
This commit is contained in:
Rhys Perry 2021-09-08 16:13:01 +01:00 • committed by Marge Bot
parent 9d9b891f94
commit 9bd7b0b305
1 changed files with 8 additions and 11 deletions
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19
src/util/ralloc.c
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@ -36,6 +36,12 @@
#define CANARY 0x5A1106
#if defined(__LP64__) || defined(_WIN64)
#define HEADER_ALIGN alignas(16)
#else
#define HEADER_ALIGN alignas(8)
#endif
/* Align the header's size so that ralloc() allocations will return with the
* same alignment as a libc malloc would have (8 on 32-bit GLIBC, 16 on
* 64-bit), avoiding performance penalities on x86 and alignment faults on
@ -43,11 +49,7 @@
*/
struct ralloc_header
{
#if defined(__LP64__) || defined(_WIN64)
alignas(16)
#else
alignas(8)
#endif
HEADER_ALIGN
#ifndef NDEBUG
/* A canary value used to determine whether a pointer is ralloc'd. */
@ -550,12 +552,7 @@ ralloc_vasprintf_rewrite_tail(char **str, size_t *start, const char *fmt,
struct linear_header {
/* align first member to align struct */
#if defined(__LP64__) || defined(_WIN64)
alignas(16)
#else
alignas(8)
#endif
HEADER_ALIGN
#ifndef NDEBUG
unsigned magic; /* for debugging */