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Add custom basic dead instruction elimination pass

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This commit is contained in:
gingerBill
2021-05-15 21:10:06 +01:00
parent 7886798156
commit 1cf6b6679d
2 changed files with 108 additions and 13 deletions
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28
src/llvm_backend.cpp
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@@ -3318,9 +3318,11 @@ void lb_end_procedure_body(lbProcedure *p) {
LLVMBuildBr(p->builder, p->entry_block->block);
LLVMPositionBuilderAtEnd(p->builder, p->curr_block->block);
LLVMValueRef instr = nullptr;
// Make sure there is a "ret void" at the end of a procedure with no return type
if (p->type->Proc.result_count == 0) {
LLVMValueRef instr = LLVMGetLastInstruction(p->curr_block->block);
instr = LLVMGetLastInstruction(p->curr_block->block);
if (!lb_is_instr_terminating(instr)) {
lb_emit_defer_stmts(p, lbDeferExit_Return, nullptr);
LLVMBuildRetVoid(p->builder);
@@ -3332,7 +3334,7 @@ void lb_end_procedure_body(lbProcedure *p) {
// Make sure every block terminates, and if not, make it unreachable
for (block = first_block; block != nullptr; block = LLVMGetNextBasicBlock(block)) {
LLVMValueRef instr = LLVMGetLastInstruction(block);
instr = LLVMGetLastInstruction(block);
if (instr == nullptr || !lb_is_instr_terminating(instr)) {
LLVMPositionBuilderAtEnd(p->builder, block);
LLVMBuildUnreachable(p->builder);
@@ -14045,7 +14047,7 @@ lbProcedure *lb_create_startup_type_info(lbModule *m) {
LLVMVerifyFunction(p->value, LLVMAbortProcessAction);
}
LLVMRunFunctionPassManager(default_function_pass_manager, p->value);
lb_run_function_pass_manager(default_function_pass_manager, p);
return p;
}
@@ -14134,7 +14136,7 @@ lbProcedure *lb_create_startup_runtime(lbModule *main_module, lbProcedure *start
LLVMVerifyFunction(p->value, LLVMAbortProcessAction);
}
LLVMRunFunctionPassManager(default_function_pass_manager, p->value);
lb_run_function_pass_manager(default_function_pass_manager, p);
return p;
}
@@ -14251,7 +14253,7 @@ lbProcedure *lb_create_main_procedure(lbModule *m, lbProcedure *startup_runtime)
LLVMVerifyFunction(p->value, LLVMAbortProcessAction);
}
LLVMRunFunctionPassManager(default_function_pass_manager, p->value);
lb_run_function_pass_manager(default_function_pass_manager, p);
return p;
}
@@ -14376,26 +14378,26 @@ WORKER_TASK_PROC(lb_llvm_function_pass_worker_proc) {
lbProcedure *p = m->procedures_to_generate[i];
if (p->body != nullptr) { // Build Procedure
if (p->flags & lbProcedureFlag_WithoutMemcpyPass) {
LLVMRunFunctionPassManager(default_function_pass_manager_without_memcpy, p->value);
lb_run_function_pass_manager(default_function_pass_manager_without_memcpy, p);
} else {
if (p->entity && p->entity->kind == Entity_Procedure) {
switch (p->entity->Procedure.optimization_mode) {
case ProcedureOptimizationMode_None:
case ProcedureOptimizationMode_Minimal:
LLVMRunFunctionPassManager(function_pass_manager_minimal, p->value);
lb_run_function_pass_manager(function_pass_manager_minimal, p);
break;
case ProcedureOptimizationMode_Size:
LLVMRunFunctionPassManager(function_pass_manager_size, p->value);
lb_run_function_pass_manager(function_pass_manager_size, p);
break;
case ProcedureOptimizationMode_Speed:
LLVMRunFunctionPassManager(function_pass_manager_speed, p->value);
lb_run_function_pass_manager(function_pass_manager_speed, p);
break;
default:
LLVMRunFunctionPassManager(default_function_pass_manager, p->value);
lb_run_function_pass_manager(default_function_pass_manager, p);
break;
}
} else {
LLVMRunFunctionPassManager(default_function_pass_manager, p->value);
lb_run_function_pass_manager(default_function_pass_manager, p);
}
}
}
@@ -14403,11 +14405,11 @@ WORKER_TASK_PROC(lb_llvm_function_pass_worker_proc) {
for_array(i, m->equal_procs.entries) {
lbProcedure *p = m->equal_procs.entries[i].value;
LLVMRunFunctionPassManager(default_function_pass_manager, p->value);
lb_run_function_pass_manager(default_function_pass_manager, p);
}
for_array(i, m->hasher_procs.entries) {
lbProcedure *p = m->hasher_procs.entries[i].value;
LLVMRunFunctionPassManager(default_function_pass_manager, p->value);
lb_run_function_pass_manager(default_function_pass_manager, p);
}
return 0;