Marco Nilsson eb793d2b82 Help the compiler optimize unaligned_type. (#1598) ... * Help the compiler optimize unaligned_type. This fixes a regression in 266b0f99 when the type was made constexpr. When switching to a loop to construct the value the compiler was unable to detect what was going on. We now unroll the loop at compile time into what's essentially a hand rolled shift and OR operation which the compiler detects and replaces with a byte swap. Tested on gcc (x86+arm) and clang (x86). Introduce a static value_from which can be used to convert a value from an existing buffer. There were previously three options for this, all bad or awkward in different ways: - val = etl::be_uint32_t(address) Copies to temporary storage. - val = *reinterpret_cast<const etl::be_uint32_t*>(address); Unreadable. - etl::be_uint32_t::copy_store_to_value(address, output); Requires an output parameter. The new addition is: - val = etl::be_uint32_t::value_from(address); Additionally, update the documentation with value_from and the missing, existing constructors. * Please clang-format. --------- Co-authored-by: John Wellbelove <jwellbelove@users.noreply.github.com>		2026-09-13 10:33:42 +01:00
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etl	Help the compiler optimize unaligned_type. (#1598)	2026-09-13 10:33:42 +01:00