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Implement AOT static PGO (#2243)

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LLVM PGO (Profile-Guided Optimization) allows the compiler to better optimize code
for how it actually runs. This PR implements the AOT static PGO, and is tested on
Linux x86-64 and x86-32. The basic steps are:

1. Use `wamrc --enable-llvm-pgo -o <aot_file_of_pgo> <wasm_file>`
   to generate an instrumented aot file.
2. Compile iwasm with `cmake -DWAMR_BUILD_STATIC_PGO=1` and run
      `iwasm --gen-prof-file=<raw_profile_file> <aot_file_of_pgo>`
    to generate the raw profile file.
3. Run `llvm-profdata merge -output=<profile_file> <raw_profile_file>`
    to merge the raw profile file into the profile file.
4. Run `wamrc --use-prof-file=<profile_file> -o <aot_file> <wasm_file>`
    to generate the optimized aot file.
5. Run the optimized aot_file: `iwasm <aot_file>`.

The test scripts are also added for each benchmark, run `test_pgo.sh` under
each benchmark's folder to test the AOT static pgo.
This commit is contained in:
Wenyong Huang
2023-06-05 09:17:39 +08:00
committed by GitHub
parent f1e9029ebc
commit 8d88471c46
29 changed files with 2000 additions and 53 deletions
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9
core/iwasm/aot/aot_reloc.h
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@ -121,6 +121,14 @@ typedef struct {
REG_SYM(aot_intrinsic_i32_rem_s), \
REG_SYM(aot_intrinsic_i32_rem_u), \
#if WASM_ENABLE_STATIC_PGO != 0
#define REG_LLVM_PGO_SYM() \
{ "__llvm_profile_instrument_target", llvm_profile_instrument_target }, \
{ "__llvm_profile_instrument_memop", llvm_profile_instrument_memop },
#else
#define REG_LLVM_PGO_SYM()
#endif
#define REG_COMMON_SYMBOLS \
REG_SYM(aot_set_exception_with_id), \
REG_SYM(aot_invoke_native), \
@ -150,6 +158,7 @@ typedef struct {
REG_REF_TYPES_SYM() \
REG_AOT_TRACE_SYM() \
REG_INTRINSIC_SYM() \
REG_LLVM_PGO_SYM() \
#define CHECK_RELOC_OFFSET(data_size) do { \
if (!check_reloc_offset(target_section_size, \