[backend]回溯了旧版本的寄存器分配器

src/backend/RISCv64/RISCv64Backend.cpp

@@ -2,6 +2,7 @@
 #include "RISCv64ISel.h"
 #include "RISCv64RegAlloc.h"
 #include "RISCv64LinearScan.h"
+#include "RISCv64SimpleRegAlloc.h"
 #include "RISCv64BasicBlockAlloc.h"
 #include "RISCv64AsmPrinter.h"
 #include "RISCv64Passes.h"
@@ -197,6 +198,8 @@ std::string RISCv64CodeGen::module_gen() {
 }
 
 std::string RISCv64CodeGen::function_gen(Function* func) {
+    DEBUG = 0;
+    DEEPDEBUG = 0;
     // === 完整的后端处理流水线 ===
 
     // 阶段 1: 指令选择 (sysy::IR -> LLIR with virtual registers)
@@ -217,7 +220,7 @@ std::string RISCv64CodeGen::function_gen(Function* func) {
     EliminateFrameIndicesPass efi_pass;
     efi_pass.runOnMachineFunction(mfunc.get());
 
-    if (DEBUG) {
+    if (true) {
         std::cerr << "====== stack info after eliminate frame indices  ======\n";
         mfunc->dumpStackFrameInfo(std::cerr);
         std::stringstream ss_after_eli;
@@ -237,7 +240,17 @@ std::string RISCv64CodeGen::function_gen(Function* func) {
     // 阶段 3: 物理寄存器分配 (Register Allocation)
 
     // 首先尝试图着色分配器
-    if (DEBUG) std::cerr << "Attempting Register Allocation with Graph Coloring...\n";
+    // int fooo = 0;
+    int fooo = 0;
+    // DEBUG = 1;
+    // DEEPDEBUG = 1;
+    if (fooo) {
+        RISCv64SimpleRegAlloc simple_alloc(mfunc.get());
+        simple_alloc.run();
+        DEBUG = 0;
+        DEEPDEBUG = 0;
+    } else
+    {if (DEBUG) std::cerr << "Attempting Register Allocation with Graph Coloring...\n";
     if (!gc_failed) {
         RISCv64RegAlloc gc_alloc(mfunc.get());
     
@@ -296,7 +309,7 @@ std::string RISCv64CodeGen::function_gen(Function* func) {
             RISCv64BasicBlockAlloc bb_alloc(mfunc.get());
             bb_alloc.run();
         }
-    }
+    }}
     
 
     if (DEBUG) {