Claude/add qbe backend 011 cu uwa f gzns yx kitqra red#4
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This commit adds a QBE (Quick Backend) IR backend to the Portable C Compiler. QBE is a small compiler backend that uses an SSA-based intermediate representation. Changes include: - Import QBE as a git submodule - Create arch/qbe/ with complete backend implementation: - macdefs.h: Type and register definitions for QBE's virtual registers - code.c: Code generation and QBE IR emission - local.c: Local type handling and transformations - local2.c: Register allocation (simplified for QBE) - table.c: Instruction selection table mapping PCC IR to QBE IR - order.c: Register ordering - Update configure.ac to recognize qbe target (qbe-local-linux) - Update os/linux/ccconfig.h to support QBE backend The QBE backend generates QBE IR output which can then be processed by the QBE compiler to produce machine code for various architectures. To use: ./configure --target=qbe-local-linux && make 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
Ignore build artifacts, generated files, and temporary documentation files created during development. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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