Add "--enable-llvm-passes=<passes>" option to wamrc (#2335)

Add "--enable-llvm-passes=<passes>" option to wamrc for customizing LLVM passes

core/iwasm/compilation/aot_llvm.c

@@ -2296,6 +2296,9 @@ aot_create_comp_context(const AOTCompData *comp_data, aot_comp_option_t option)
     if (option->enable_stack_estimation)
         comp_ctx->enable_stack_estimation = true;
 
+    if (option->llvm_passes)
+        comp_ctx->llvm_passes = option->llvm_passes;
+
     comp_ctx->opt_level = option->opt_level;
     comp_ctx->size_level = option->size_level;
 

core/iwasm/compilation/aot_llvm.h

@@ -417,6 +417,7 @@ typedef struct AOTCompContext {
 
     const char *stack_usage_file;
     char stack_usage_temp_file[64];
+    const char *llvm_passes;
 } AOTCompContext;
 
 enum {
@@ -455,6 +456,7 @@ typedef struct AOTCompOption {
     char **custom_sections;
     uint32 custom_sections_count;
     const char *stack_usage_file;
+    const char *llvm_passes;
 } AOTCompOption, *aot_comp_option_t;
 
 bool

core/iwasm/compilation/aot_llvm_extra.cpp

@@ -373,6 +373,10 @@ aot_apply_llvm_new_pass_manager(AOTCompContext *comp_ctx, LLVMModuleRef module)
 
         MPM.addPass(createModuleToFunctionPassAdaptor(std::move(FPM)));
 
+        if (comp_ctx->llvm_passes) {
+            ExitOnErr(PB.parsePassPipeline(MPM, comp_ctx->llvm_passes));
+        }
+
         if (!disable_llvm_lto) {
             /* Apply LTO for AOT mode */
             if (comp_ctx->comp_data->func_count >= 10

core/iwasm/include/aot_export.h

@@ -67,6 +67,7 @@ typedef struct AOTCompOption {
     char **custom_sections;
     uint32_t custom_sections_count;
     const char *stack_usage_file;
+    const char *llvm_passes;
 } AOTCompOption, *aot_comp_option_t;
 
 bool

wamr-compiler/main.c

@@ -70,6 +70,8 @@ print_help()
     printf("  --disable-llvm-intrinsics Disable the LLVM built-in intrinsics\n");
     printf("  --disable-llvm-lto        Disable the LLVM link time optimization\n");
     printf("  --enable-llvm-pgo         Enable LLVM PGO (Profile-Guided Optimization)\n");
+    printf("  --enable-llvm-passes=<passes>\n");
+    printf("                            Enable the specified LLVM passes, using comma to separate\n");
     printf("  --use-prof-file=<file>    Use profile file collected by LLVM PGO (Profile-Guided Optimization)\n");
     printf("  --enable-segue[=<flags>]  Enable using segment register GS as the base address of linear memory,\n");
     printf("                            only available on linux/linux-sgx x86-64, which may improve performance,\n");
@@ -342,6 +344,11 @@ main(int argc, char *argv[])
         else if (!strcmp(argv[0], "--enable-llvm-pgo")) {
             option.enable_llvm_pgo = true;
         }
+        else if (!strncmp(argv[0], "--enable-llvm-passes=", 21)) {
+            if (argv[0][21] == '\0')
+                PRINT_HELP_AND_EXIT();
+            option.llvm_passes = argv[0] + 21;
+        }
         else if (!strncmp(argv[0], "--use-prof-file=", 16)) {
             if (argv[0][16] == '\0')
                 PRINT_HELP_AND_EXIT();