Clamp maximum optimization level to 2 for `-llvm-api`

1 files changed, 21 insertions, 13 deletions

diff --git a/src/llvm_backend_opt.cpp b/src/llvm_backend_opt.cpp
index 0c53a01aa..ebb0ec0e3 100644
--- a/src/llvm_backend_opt.cpp
+++ b/src/llvm_backend_opt.cpp
@@ -2,11 +2,15 @@
 #define LLVM_USE_BASIC_PASSES 0
 #endif
 
-void lb_populate_function_pass_manager(LLVMPassManagerRef fpm, bool ignore_memcpy_pass) {
+void lb_populate_function_pass_manager(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);
+
 	if (!ignore_memcpy_pass) {
 		LLVMAddMemCpyOptPass(fpm);
 	}
-	if (LLVM_USE_BASIC_PASSES || build_context.optimization_level == 0) {
+	if (LLVM_USE_BASIC_PASSES || optimization_level == 0) {
 		LLVMAddPromoteMemoryToRegisterPass(fpm);
 		LLVMAddMergedLoadStoreMotionPass(fpm);
 		LLVMAddEarlyCSEPass(fpm);
@@ -35,7 +39,7 @@ void lb_populate_function_pass_manager(LLVMPassManagerRef fpm, bool ignore_memcp
 	LLVMAddLowerExpectIntrinsicPass(fpm);
 }
 
-void lb_add_function_simplifcation_passes(LLVMPassManagerRef mpm) {
+void lb_add_function_simplifcation_passes(LLVMPassManagerRef mpm, i32 optimization_level) {
 	// LLVMAddScalarReplAggregatesPass(mpm);
 	LLVMAddEarlyCSEMemSSAPass(mpm);
 
@@ -44,7 +48,7 @@ void lb_add_function_simplifcation_passes(LLVMPassManagerRef mpm) {
 
 	LLVMAddJumpThreadingPass(mpm);
 
-	if (build_context.optimization_level > 2) {
+	if (optimization_level > 2) {
 		LLVMAddAggressiveInstCombinerPass(mpm);
 	}
 	LLVMAddInstructionCombiningPass(mpm);
@@ -88,10 +92,14 @@ void lb_add_function_simplifcation_passes(LLVMPassManagerRef mpm) {
 }
 
 
-void lb_populate_module_pass_manager(LLVMTargetMachineRef target_machine, LLVMPassManagerRef 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);
+
 	LLVMPassManagerBuilderRef pmb = LLVMPassManagerBuilderCreate();
-	LLVMPassManagerBuilderSetOptLevel(pmb, build_context.optimization_level);
-	LLVMPassManagerBuilderSetSizeLevel(pmb, build_context.optimization_level);
+	LLVMPassManagerBuilderSetOptLevel(pmb, optimization_level);
+	LLVMPassManagerBuilderSetSizeLevel(pmb, optimization_level);
 
 	LLVMPassManagerBuilderPopulateLTOPassManager(pmb, mpm, false, true);
 
@@ -99,7 +107,7 @@ void lb_populate_module_pass_manager(LLVMTargetMachineRef target_machine, LLVMPa
 	LLVMAddStripDeadPrototypesPass(mpm);
 	LLVMAddAnalysisPasses(target_machine, mpm);
 	LLVMAddPruneEHPass(mpm);
-	if (LLVM_USE_BASIC_PASSES || build_context.optimization_level == 0) {
+	if (LLVM_USE_BASIC_PASSES || optimization_level == 0) {
 		// LLVMAddMergeFunctionsPass(mpm);
 		return;
 	}
@@ -119,10 +127,10 @@ void lb_populate_module_pass_manager(LLVMTargetMachineRef target_machine, LLVMPa
 	LLVMAddPruneEHPass(mpm);
 	LLVMAddFunctionInliningPass(mpm);
 
-	if (build_context.optimization_level > 2) {
+	if (optimization_level > 2) {
 		LLVMAddArgumentPromotionPass(mpm);
 	}
-	lb_add_function_simplifcation_passes(mpm);
+	lb_add_function_simplifcation_passes(mpm, optimization_level);
 
 	LLVMAddGlobalOptimizerPass(mpm);
 
@@ -133,7 +141,7 @@ void lb_populate_module_pass_manager(LLVMTargetMachineRef target_machine, LLVMPa
 	LLVMAddLoopVectorizePass(mpm);
 
 	LLVMAddInstructionCombiningPass(mpm);
-	if (build_context.optimization_level >= 2) {
+	if (optimization_level >= 2) {
 		LLVMAddEarlyCSEPass(mpm);
 		LLVMAddCorrelatedValuePropagationPass(mpm);
 		LLVMAddLICMPass(mpm);
@@ -151,7 +159,7 @@ void lb_populate_module_pass_manager(LLVMTargetMachineRef target_machine, LLVMPa
 
 	LLVMAddStripDeadPrototypesPass(mpm);
 
-	if (build_context.optimization_level >= 2) {
+	if (optimization_level >= 2) {
 		LLVMAddGlobalDCEPass(mpm);
 		LLVMAddConstantMergePass(mpm);
 	}
@@ -163,7 +171,7 @@ void lb_populate_module_pass_manager(LLVMTargetMachineRef target_machine, LLVMPa
 		LLVMAddAlwaysInlinerPass(mpm);
 		LLVMAddStripDeadPrototypesPass(mpm);
 		LLVMAddAnalysisPasses(target_machine, mpm);
-		if (build_context.optimization_level >= 2) {
+		if (optimization_level >= 2) {
 			LLVMAddArgumentPromotionPass(mpm);
 			LLVMAddConstantMergePass(mpm);
 			LLVMAddGlobalDCEPass(mpm);