llvm-project

000279dc - [NFC][TTI] Introduce getInstructionUniformity API for uniformity analysis (#168903)

[NFC][TTI] Introduce getInstructionUniformity API for uniformity analysis (#168903) This patch introduces a new TargetTransformInfo hook `getInstructionUniformity()` that provides a unified interface for querying target-specific uniformity information about instructions and values. The new hook returns an `InstructionUniformity` enum with three values: - Default: Result is uniform if all operands are uniform (standard propagation) - AlwaysUniform: Result is always uniform regardless of operands - NeverUniform: Result can never be assumed uniform This API wraps the existing `isAlwaysUniform()` and `isSourceOfDivergence()` hooks, providing a single entry point for uniformity queries. Both LLVM IR-level (via TTI) and MIR-level (via TargetInstrInfo) uniformity analysis have been updated to use the new hook. Target implementations: - AMDGPU: Wraps existing `isAlwaysUniform()` and `isSourceOfDivergence()` hooks - NVPTX: Wraps existing `isSourceOfDivergence()` hook This is an NFC change - all implementations return conservative defaults or wrap existing functionality. Ref patch:https://github.com/llvm/llvm-project/pull/137639