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void lb_populate_function_pass_manager(lbModule *m, LLVMPassManagerRef fpm, bool ignore_memcpy_pass, i32 optimization_level);
void lb_add_function_simplifcation_passes(LLVMPassManagerRef mpm, i32 optimization_level);
void lb_populate_module_pass_manager(LLVMTargetMachineRef target_machine, LLVMPassManagerRef mpm, i32 optimization_level);
void lb_populate_function_pass_manager_specific(lbModule *m, LLVMPassManagerRef fpm, i32 optimization_level);
LLVMBool lb_must_preserve_predicate_callback(LLVMValueRef value, void *user_data) {
lbModule *m = cast(lbModule *)user_data;
if (m == nullptr) {
return false;
}
if (value == nullptr) {
return false;
}
return LLVMIsAAllocaInst(value) != nullptr;
}
void lb_add_must_preserve_predicate_pass(lbModule *m, LLVMPassManagerRef fpm, i32 optimization_level) {
if (false && optimization_level == 0 && m->debug_builder) {
// LLVMAddInternalizePassWithMustPreservePredicate(fpm, m, lb_must_preserve_predicate_callback);
}
}
void lb_basic_populate_function_pass_manager(LLVMPassManagerRef fpm) {
LLVMAddPromoteMemoryToRegisterPass(fpm);
LLVMAddMergedLoadStoreMotionPass(fpm);
LLVMAddConstantPropagationPass(fpm);
LLVMAddEarlyCSEPass(fpm);
LLVMAddConstantPropagationPass(fpm);
LLVMAddMergedLoadStoreMotionPass(fpm);
LLVMAddPromoteMemoryToRegisterPass(fpm);
LLVMAddCFGSimplificationPass(fpm);
}
void lb_populate_function_pass_manager(lbModule *m, LLVMPassManagerRef fpm, bool ignore_memcpy_pass, i32 optimization_level) {
// NOTE(bill): Treat -opt:3 as if it was -opt:2
// TODO(bill): Determine which opt definitions should exist in the first place
optimization_level = gb_clamp(optimization_level, 0, 2);
lb_add_must_preserve_predicate_pass(m, fpm, optimization_level);
if (ignore_memcpy_pass) {
lb_basic_populate_function_pass_manager(fpm);
return;
} else if (optimization_level == 0) {
LLVMAddMemCpyOptPass(fpm);
lb_basic_populate_function_pass_manager(fpm);
return;
}
#if 0
LLVMPassManagerBuilderRef pmb = LLVMPassManagerBuilderCreate();
LLVMPassManagerBuilderSetOptLevel(pmb, optimization_level);
LLVMPassManagerBuilderSetSizeLevel(pmb, optimization_level);
LLVMPassManagerBuilderPopulateFunctionPassManager(pmb, fpm);
#else
LLVMAddMemCpyOptPass(fpm);
LLVMAddPromoteMemoryToRegisterPass(fpm);
LLVMAddMergedLoadStoreMotionPass(fpm);
LLVMAddConstantPropagationPass(fpm);
LLVMAddEarlyCSEPass(fpm);
LLVMAddConstantPropagationPass(fpm);
LLVMAddMergedLoadStoreMotionPass(fpm);
LLVMAddPromoteMemoryToRegisterPass(fpm);
LLVMAddCFGSimplificationPass(fpm);
LLVMAddSCCPPass(fpm);
LLVMAddPromoteMemoryToRegisterPass(fpm);
LLVMAddUnifyFunctionExitNodesPass(fpm);
LLVMAddCFGSimplificationPass(fpm);
LLVMAddEarlyCSEPass(fpm);
LLVMAddLowerExpectIntrinsicPass(fpm);
#endif
}
void lb_populate_function_pass_manager_specific(lbModule *m, LLVMPassManagerRef fpm, i32 optimization_level) {
// NOTE(bill): Treat -opt:3 as if it was -opt:2
// TODO(bill): Determine which opt definitions should exist in the first place
optimization_level = gb_clamp(optimization_level, 0, 2);
lb_add_must_preserve_predicate_pass(m, fpm, optimization_level);
if (optimization_level == 0) {
LLVMAddMemCpyOptPass(fpm);
lb_basic_populate_function_pass_manager(fpm);
return;
}
#if 1
LLVMPassManagerBuilderRef pmb = LLVMPassManagerBuilderCreate();
LLVMPassManagerBuilderSetOptLevel(pmb, optimization_level);
LLVMPassManagerBuilderSetSizeLevel(pmb, optimization_level);
LLVMPassManagerBuilderPopulateFunctionPassManager(pmb, fpm);
#else
LLVMAddMemCpyOptPass(fpm);
LLVMAddPromoteMemoryToRegisterPass(fpm);
LLVMAddMergedLoadStoreMotionPass(fpm);
LLVMAddConstantPropagationPass(fpm);
LLVMAddEarlyCSEPass(fpm);
LLVMAddConstantPropagationPass(fpm);
LLVMAddMergedLoadStoreMotionPass(fpm);
LLVMAddPromoteMemoryToRegisterPass(fpm);
LLVMAddCFGSimplificationPass(fpm);
LLVMAddSCCPPass(fpm);
LLVMAddPromoteMemoryToRegisterPass(fpm);
LLVMAddUnifyFunctionExitNodesPass(fpm);
LLVMAddCFGSimplificationPass(fpm);
LLVMAddEarlyCSEPass(fpm);
LLVMAddLowerExpectIntrinsicPass(fpm);
#endif
}
void lb_add_function_simplifcation_passes(LLVMPassManagerRef mpm, i32 optimization_level) {
LLVMAddEarlyCSEMemSSAPass(mpm);
LLVMAddGVNPass(mpm);
LLVMAddCFGSimplificationPass(mpm);
LLVMAddJumpThreadingPass(mpm);
// if (optimization_level > 2) {
// LLVMAddAggressiveInstCombinerPass(mpm);
// }
LLVMAddInstructionCombiningPass(mpm);
LLVMAddSimplifyLibCallsPass(mpm);
LLVMAddTailCallEliminationPass(mpm);
LLVMAddCFGSimplificationPass(mpm);
LLVMAddReassociatePass(mpm);
LLVMAddLoopRotatePass(mpm);
LLVMAddLICMPass(mpm);
LLVMAddLoopUnswitchPass(mpm);
LLVMAddCFGSimplificationPass(mpm);
LLVMAddInstructionCombiningPass(mpm);
LLVMAddIndVarSimplifyPass(mpm);
LLVMAddLoopIdiomPass(mpm);
LLVMAddLoopDeletionPass(mpm);
LLVMAddLoopUnrollPass(mpm);
LLVMAddMergedLoadStoreMotionPass(mpm);
LLVMAddGVNPass(mpm);
LLVMAddMemCpyOptPass(mpm);
LLVMAddSCCPPass(mpm);
LLVMAddBitTrackingDCEPass(mpm);
LLVMAddInstructionCombiningPass(mpm);
LLVMAddJumpThreadingPass(mpm);
LLVMAddCorrelatedValuePropagationPass(mpm);
LLVMAddDeadStoreEliminationPass(mpm);
LLVMAddLICMPass(mpm);
LLVMAddLoopRerollPass(mpm);
LLVMAddAggressiveDCEPass(mpm);
LLVMAddCFGSimplificationPass(mpm);
LLVMAddInstructionCombiningPass(mpm);
}
void lb_populate_module_pass_manager(LLVMTargetMachineRef target_machine, LLVMPassManagerRef mpm, i32 optimization_level) {
// NOTE(bill): Treat -opt:3 as if it was -opt:2
// TODO(bill): Determine which opt definitions should exist in the first place
optimization_level = gb_clamp(optimization_level, 0, 2);
LLVMAddAlwaysInlinerPass(mpm);
LLVMAddStripDeadPrototypesPass(mpm);
LLVMAddAnalysisPasses(target_machine, mpm);
LLVMAddPruneEHPass(mpm);
if (optimization_level == 0) {
return;
}
LLVMAddGlobalDCEPass(mpm);
if (optimization_level >= 2) {
// NOTE(bill, 2021-03-29: use this causes invalid code generation)
// LLVMPassManagerBuilderRef pmb = LLVMPassManagerBuilderCreate();
// LLVMPassManagerBuilderSetOptLevel(pmb, optimization_level);
// LLVMPassManagerBuilderPopulateModulePassManager(pmb, mpm);
// LLVMPassManagerBuilderPopulateLTOPassManager(pmb, mpm, false, true);
// return;
}
LLVMAddIPSCCPPass(mpm);
LLVMAddCalledValuePropagationPass(mpm);
LLVMAddGlobalOptimizerPass(mpm);
LLVMAddDeadArgEliminationPass(mpm);
// LLVMAddConstantMergePass(mpm); // ???
LLVMAddInstructionCombiningPass(mpm);
LLVMAddCFGSimplificationPass(mpm);
LLVMAddPruneEHPass(mpm);
if (optimization_level < 2) {
return;
}
LLVMAddFunctionInliningPass(mpm);
lb_add_function_simplifcation_passes(mpm, optimization_level);
LLVMAddGlobalDCEPass(mpm);
LLVMAddGlobalOptimizerPass(mpm);
// LLVMAddLowerConstantIntrinsicsPass(mpm);
LLVMAddLoopRotatePass(mpm);
LLVMAddLoopVectorizePass(mpm);
LLVMAddInstructionCombiningPass(mpm);
if (optimization_level >= 2) {
LLVMAddEarlyCSEPass(mpm);
LLVMAddCorrelatedValuePropagationPass(mpm);
LLVMAddLICMPass(mpm);
LLVMAddLoopUnswitchPass(mpm);
LLVMAddCFGSimplificationPass(mpm);
LLVMAddInstructionCombiningPass(mpm);
}
LLVMAddCFGSimplificationPass(mpm);
LLVMAddSLPVectorizePass(mpm);
LLVMAddLICMPass(mpm);
LLVMAddAlignmentFromAssumptionsPass(mpm);
LLVMAddStripDeadPrototypesPass(mpm);
if (optimization_level >= 2) {
LLVMAddGlobalDCEPass(mpm);
LLVMAddConstantMergePass(mpm);
}
LLVMAddCFGSimplificationPass(mpm);
}
void lb_run_remove_dead_instruction_pass(lbProcedure *p) {
isize removal_count = 0;
isize pass_count = 0;
isize const max_pass_count = 10;
// Custom remove dead instruction pass
for (; pass_count < max_pass_count; pass_count++) {
bool was_dead_instructions = false;
// NOTE(bill): Iterate backwards
// reduces the number of passes as things later on will depend on things previously
for (LLVMBasicBlockRef block = LLVMGetLastBasicBlock(p->value);
block != nullptr;
block = LLVMGetPreviousBasicBlock(block)) {
// NOTE(bill): Iterate backwards
// reduces the number of passes as things later on will depend on things previously
for (LLVMValueRef instr = LLVMGetLastInstruction(block);
instr != nullptr;
/**/) {
LLVMValueRef curr_instr = instr;
instr = LLVMGetPreviousInstruction(instr);
LLVMUseRef first_use = LLVMGetFirstUse(curr_instr);
if (first_use != nullptr) {
continue;
}
if (LLVMTypeOf(curr_instr) == nullptr) {
continue;
}
// NOTE(bill): Explicit instructions are set here because some instructions could have side effects
switch (LLVMGetInstructionOpcode(curr_instr)) {
case LLVMAdd:
case LLVMFAdd:
case LLVMSub:
case LLVMFSub:
case LLVMMul:
case LLVMFMul:
case LLVMUDiv:
case LLVMSDiv:
case LLVMFDiv:
case LLVMURem:
case LLVMSRem:
case LLVMFRem:
case LLVMShl:
case LLVMLShr:
case LLVMAShr:
case LLVMAnd:
case LLVMOr:
case LLVMXor:
case LLVMAlloca:
case LLVMLoad:
case LLVMGetElementPtr:
case LLVMTrunc:
case LLVMZExt:
case LLVMSExt:
case LLVMFPToUI:
case LLVMFPToSI:
case LLVMUIToFP:
case LLVMSIToFP:
case LLVMFPTrunc:
case LLVMFPExt:
case LLVMPtrToInt:
case LLVMIntToPtr:
case LLVMBitCast:
case LLVMAddrSpaceCast:
case LLVMICmp:
case LLVMFCmp:
case LLVMSelect:
case LLVMExtractElement:
removal_count += 1;
LLVMInstructionEraseFromParent(curr_instr);
was_dead_instructions = true;
break;
}
}
}
if (!was_dead_instructions) {
break;
}
}
}
void lb_run_function_pass_manager(LLVMPassManagerRef fpm, lbProcedure *p) {
LLVMRunFunctionPassManager(fpm, p->value);
// NOTE(bill): LLVMAddDCEPass doesn't seem to be exported in the official DLL's for LLVM
// which means we cannot rely upon it
// This is also useful for read the .ll for debug purposes because a lot of instructions
// are not removed
lb_run_remove_dead_instruction_pass(p);
}
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