[PATCH] D140689: [llvm][dfsan] Enable loongarch64 and add `zeroext` attribute

[Youling Tang via Phabricator via llvm-commits]

tangyouling created this revision.
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Enable loongarch64 and add `zeroext` attribute for below callbacks'
first parameter to conform ABI calling convention.

- __dfsan_load_callback
- __dfsan_store_callback
- __dfsan_cmp_callback
- __dfsan_conditional_callback
- __dfsan_conditional_callback_origin
- __dfsan_reaches_function_callback
- __dfsan_reaches_function_callback_origin

The type of these callbacks' first parameter is `u8` (see the
definition of `dfsan_label`). LoongArch ABI (at least the lp64d)
requires unsigned integer data types (except unsigned int) are
zero-extended when stored in general-purpose register. So we need to
add the `zeroext` attribute when declaring and calling them.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D140689

Files:
  llvm/lib/Transforms/Instrumentation/DataFlowSanitizer.cpp
  llvm/test/Instrumentation/DataFlowSanitizer/callback-loongarch64.ll

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