Commits on Jul 17, 2021

1. Use small code model for UEFI targets …

   * Since the code model only applies to the code and not the data and the code model
   only applies to functions you call through using `call`, `jmp` and data with `lea`, etc…
   
   If you are calling functions using the function pointers from the UEFI structures the code
   model does not apply in that case. It’s just related to the address space size of your own binary.
   Since UEFI (uefi is all relocatable) uses relocatable PEs (relocatable code does not care about the
   code model) so, we use the small code model here.
   
   * Since applications don't usually take gigabytes of memory, setting the
   target to use the small code model should result in better codegen (comparable
   with majority of other targets).
   
   Large code models are also known for generating horrible code, for
   example 16 bytes of code to load a single 8-byte value.
   
   * Use the LLVM default code model for the architecture for the
   x86_64-unknown-uefi targets. For reference small is the default
   code model on x86 in LLVM: <https://github.com/llvm/llvm-project/blob/7de2173c2a4c45711831cfee3ccf53690c76ff07/llvm/lib/Target/X86/X86TargetMachine.cpp#L204>
   
   * Remove the comments too as they are not UEFI-specific and applies
   to pretty much any target. I added them before as I was explicitily
   setting the code model to small.
   
   Signed-off-by: Andy-Python-Programmer <andypythonappdeveloper@gmail.com>

   

   Andy-Python-Programmer committed Jul 17, 2021
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