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Modify optimize-testing instructions

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Mention -flto and whole-program optimization as this is the most
important aspect.

Signed-off-by: David Horstmann <david.horstmann@arm.com>
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David Horstmann 2023-10-19 15:22:15 +01:00
parent 3f7e42a750
commit a72b4ca734
1 changed files with 2 additions and 1 deletions
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docs/architecture/psa-shared-memory.md
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@ -239,7 +239,8 @@ Copy what needs copying. This is broadly straightforward, however there are a fe
It is unclear whether the compiler will attempt to optimize away copying operations. It is unclear whether the compiler will attempt to optimize away copying operations.
Once the copying code is implemented, it should be evaluated to see whether compiler optimization is a problem. Specifically, for the major compilers and platforms supported by Mbed TLS: Once the copying code is implemented, it should be evaluated to see whether compiler optimization is a problem. Specifically, for the major compilers and platforms supported by Mbed TLS:
* Build Mbed TLS with the compiler set to a high level of optimization (e.g. `-O2` for `gcc`). * Write a small program that uses a PSA function which copies inputs or outputs.
* Build the program with link-time optimization / full-program optimization enabled (e.g. `-flto` with `gcc`).
* Inspect the generated code with `objdump` or a similar tool to see if copying operations are preserved. * Inspect the generated code with `objdump` or a similar tool to see if copying operations are preserved.
If copying behaviour is preserved by all major compilers and platforms then assume that compiler optimization is not a problem. If copying behaviour is preserved by all major compilers and platforms then assume that compiler optimization is not a problem.