ISPC Lit Tests

A concise guide for writing lit tests for the ISPC. These tests ensure compiler correctness, verify generated code, and prevent regressions.

When to Use Lit Tests

Use lit tests when validating:

• Compiler output — LLVM IR, assembly, or AST.
• Diagnostics — warnings, errors, or other emitted messages.
• Platform behavior — verifying cross-platform or target-specific differences.
• Regression coverage — reproducing and locking fixes for known compiler issues.

Core Guidelines