# ASM Backend - COMPLETE ✅

## Status: WORKING PERFECTLY

The x86-64 Assembly backend is now fully functional and passes all tests with benchmark.ac.

## Fixes Applied

### 1. @ Operator (Multiplication)
- **Issue**: `@=` operator was using `xor` instead of `imul`
- **Fix**: Changed `AtEqualStmt` to use `imul %rdx` for multiplication
- **Location**: `codegen_asm.cpp` line ~1393

### 2. Condition Parsing Bug
- **Issue**: `translateCondition` was converting `<=` to `<==` by replacing single `=` with `==`
- **Fix**: Added checks for `<=` and `>=` before doing single `=` replacement
- **Location**: `codegen_asm.cpp` `translateCondition` function

### 3. Register Size Consistency
- **Issue**: Mixed use of 32-bit (`%eax`, `%edi`) and 64-bit (`%rax`, `%rdi`) registers
- **Fix**: Standardized on 64-bit registers throughout:
  - `loadOperand`: `%eax` → `%rax`
  - Function parameters: `%edi, %esi, %edx, %ecx, %r8d, %r9d` → `%rdi, %rsi, %rdx, %rcx, %r8, %r9`
  - Return values: `%eax` → `%rax`
- **Location**: Multiple locations in `codegen_asm.cpp`

### 4. Function Code Section
- **Issue**: Functions were being placed in `.rodata` (read-only data) instead of `.text` (code)
- **Fix**: Added `.section .text` directive before outputting functions in `generate()`
- **Location**: `codegen_asm.cpp` `generate` function

### 5. Stack Frame Collision
- **Issue**: Local variables were overwriting function parameters due to incorrect `stackOffset`
- **Fix**: Set `stackOffset = -8 - (paramCount * 8)` after storing parameters
- **Location**: `codegen_asm.cpp` `FuncDef` case

### 6. GNU Stack Note
- **Issue**: Linker warnings about executable stack
- **Fix**: Added `.section .note.GNU-stack,"",@progbits` at end of output
- **Location**: `codegen_asm.cpp` `generate` function

## Test Results

### benchmark.ac Output:
```
=== AC Language Benchmark ===
Starting computation...
Computing Fibonacci(15)...
610
Computing Factorial(10)...
3628800
Computing Sum(1 to 1000)...
500500
Computing 2^20...
1048576
=== Benchmark Complete ===
```

All values are correct! ✅

## Backend Priority Status

According to user hierarchy:
1. **ASM** - ✅ COMPLETE (Crucial for Binary)
2. **Python** - ✅ COMPLETE (easiest to update)
3. **Rust** - ✅ COMPLETE (Fastest)
4. **C** - ✅ COMPLETE (most popular compiled language)
5. **C++** - ✅ COMPLETE (upgraded C)
6. **JavaScript** - ✅ COMPLETE
7. **Go** - ✅ COMPLETE
8. **HTML** - ✅ COMPLETE
9. **Java** - ⚠️ PARTIAL (needs full statement support in FuncDef)
10. **V** - ❌ INCOMPLETE (requires compiler installation)

## Next Steps

- Fix Java backend FuncDef to support full statement generation (IF, WHILST, variable declarations)
- Test V backend once V compiler is installed
