From 8c20ac1bf052851c0547b77bfacb13bb53265b8c Mon Sep 17 00:00:00 2001
From: gingerBill <bill@gingerbill.org>
Date: Mon, 29 Mar 2021 14:55:37 +0100
Subject: [PATCH] Add optional `LLVM_USE_BASIC_PASSES` build flag. If evaluates
 to a truthy value, it will be do only basic passes for -llvm-api

---
 src/llvm_backend_opt.cpp | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/llvm_backend_opt.cpp b/src/llvm_backend_opt.cpp
index 395ee2fce..0c53a01aa 100644
--- a/src/llvm_backend_opt.cpp
+++ b/src/llvm_backend_opt.cpp
@@ -1,8 +1,12 @@
+#ifndef LLVM_USE_BASIC_PASSES
+#define LLVM_USE_BASIC_PASSES 0
+#endif
+
 void lb_populate_function_pass_manager(LLVMPassManagerRef fpm, bool ignore_memcpy_pass) {
 	if (!ignore_memcpy_pass) {
 		LLVMAddMemCpyOptPass(fpm);
 	}
-	if (build_context.optimization_level == 0) {
+	if (LLVM_USE_BASIC_PASSES || build_context.optimization_level == 0) {
 		LLVMAddPromoteMemoryToRegisterPass(fpm);
 		LLVMAddMergedLoadStoreMotionPass(fpm);
 		LLVMAddEarlyCSEPass(fpm);
@@ -95,7 +99,7 @@ void lb_populate_module_pass_manager(LLVMTargetMachineRef target_machine, LLVMPa
 	LLVMAddStripDeadPrototypesPass(mpm);
 	LLVMAddAnalysisPasses(target_machine, mpm);
 	LLVMAddPruneEHPass(mpm);
-	if (build_context.optimization_level == 0) {
+	if (LLVM_USE_BASIC_PASSES || build_context.optimization_level == 0) {
 		// LLVMAddMergeFunctionsPass(mpm);
 		return;
 	}