SiFive Toolchain Supported Extensions List Generator

This project provides a script to automate the extraction and comparison of available RISC-V extensions across different versions of the SiFive Freedom Tools RISC-V toolchain.

The script will:

1. Load each specified toolchain module.
2. Run riscv64-unknown-elf-gcc -march=help and riscv64-unknown-elf-clang --print-supported-extensions to extract supported extensions.
3. Convert the outputs to CSV format.
4. Merge all CSVs into a combined, sorted output file showing which extensions are supported in each toolchain version.

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🔧 Requirements

• Bash shell
• module command (e.g., Lmod or Environment Modules)
• Python 3
• RISC-V toolchains available as modules
• Two Python scripts in the same directory:
  • gen_txt2csv.py — Converts GCC/Clang output to CSV
  • merge_riscv_extensions.py — Merges all CSVs into one

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📁 Folder Structure

.
├── gen_compiler_ext.sh         # The main bash script
├── gen_txt2csv.py              # Converts compiler output to CSV
├── merge_riscv_extensions.py   # Merges multiple CSV files
└── csv/                        # Output folder (auto-generated)

🚀 Usage

Basic Usage

Run full processing (if csv/ doesn't exist):

./gen_compiler_ext.sh

Force full processing (even if output folder exists):

./gen_compiler_ext.sh --force

Command Line Options

The script supports several command-line options:

Options:
  --help, -h              Show help message and exit
  --force                 Force regeneration of all output files
  --output-dir DIR        Set output directory (default: ./csv)
  --merged-file FILE      Set merged output file name (default: compiler-ext.csv)
  --gcc-triple NAME       Use specific GCC triple name (default: riscv64-unknown-elf-gcc)
  --clang-triple NAME     Use specific Clang triple name (default: riscv64-unknown-elf-clang)
  --version VER           Process specific version only
  --list-versions         List available versions and exit
  --no-description       Filter out description column in the merged output

Examples

Process all toolchain versions:

./gen_compiler_ext.sh

Process a specific version only:

./gen_compiler_ext.sh --version 3.1.4

Change the output directory:

./gen_compiler_ext.sh --output-dir ./my-reports

Use a different GCC triple:

./gen_compiler_ext.sh --gcc-triple riscv64-linux-gnu-gcc

List all available versions:

./gen_compiler_ext.sh --list-versions

Filter out description column from output:
```bash
./gen_compiler_ext.sh --no-description

📦 Output Files

After successful execution, you will get:

csv/
├── gcc-1.0.6.csv
├── gcc-1.0.7.csv
├── ...
├── gcc-3.1.4.csv
├── clang-1.0.6.csv
├── clang-1.0.7.csv
├── ...
└── clang-3.1.4.csv

compiler-ext.csv    # Combined & sorted CSV of all versions

The merged CSV file includes columns for each toolchain version, showing whether each extension is supported ('Y') or not ('N').

📊 Excel Conversion

You can convert the generated CSV file to a formatted Excel spreadsheet using the included csv_to_xlsx.py script:

python csv_to_xlsx.py compiler-ext.csv

Excel Conversion Options

Options:
  --output, -o FILE       Specify output XLSX filename
  --freeze, -f            Freeze the first two columns (Name, Version)
  --separate-sheets, -s   Create additional separate sheets for GCC and Clang

Examples

# Basic conversion
python csv_to_xlsx.py compiler-ext.csv

# Create additional separate sheets for GCC and Clang
python csv_to_xlsx.py compiler-ext.csv --separate-sheets

# Specify a custom output filename
python csv_to_xlsx.py compiler-ext.csv -o risc-v-extensions.xlsx

Dependencies

This script requires:

• pandas
• openpyxl

You can install these with:

pip install pandas openpyxl

The Excel file will have conditional formatting with green highlighting for supported extensions ('Y') and red for unsupported ones ('N').