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Flip #if logic for unaligned access

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Assume only x86 can correctly/efficiently handle unaligned access.
This commit is contained in:
Michael Davidsaver
2023-05-24 21:31:04 -07:00
parent 87018882d1
commit c16f19c80e
1 changed files with 5 additions and 2 deletions
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7
src/misc/pv/byteBuffer.h
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@@ -150,14 +150,17 @@ struct swap<8> {
#undef _PVA_swap64
/* PVD serialization doesn't pay attention to alignement,
* which some targets really care about and treat unaligned
* which some targets (ARM and powerpc) really care about and treat unaligned
* access as a fault, or with a heavy penalty (~= to a syscall).
*
* For those targets,, we will have to live with the increase
* in execution time and/or object code size of byte-wise copy.
*
* Treat x86 32/64 as an outlier, and assume all other targets
* need, or greatly benefit, from aligned access.
*/
#if defined(_ARCH_PPC) || defined(__arm__) || defined(_M_ARM)
#if !(defined(__x86_64__) || defined(_M_AMD64) || defined(__i386__) || defined(_M_IX86))
template<typename T>
union alignu {