[all-commits] [llvm/llvm-project] edbecc: [HLSL] Implement the SV_InstanceID semantic (#221091)

[Jonathan Zakharov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: edbeccc7c205ccd4e6ea37a01eb63740d065f145
      https://github.com/llvm/llvm-project/commit/edbeccc7c205ccd4e6ea37a01eb63740d065f145
  Author: Jonathan Zakharov <jzakharov at nvidia.com>
  Date:   2026-09-23 (Wed, 23 Sep 2026)

  Changed paths:
    M clang/lib/CodeGen/CGHLSLRuntime.cpp
    M clang/lib/Sema/SemaHLSL.cpp
    A clang/test/CodeGenHLSL/semantics/SV_InstanceID.vs.hlsl
    A clang/test/SemaHLSL/Semantics/instanceid.output.hlsl
    A clang/test/SemaHLSL/Semantics/instanceid.ps.hlsl
    A clang/test/SemaHLSL/Semantics/instanceid.vs.hlsl
    M llvm/lib/Frontend/HLSL/SemanticSignatures.cpp
    M llvm/unittests/Frontend/HLSLSemanticStagesTest.cpp

  Log Message:
  -----------
  [HLSL] Implement the SV_InstanceID semantic (#221091)

Fixes #212572

Adds type validation, stage restriction, and lowering for
`SV_InstanceID`.

- Type check rejects non-uint; DXIL accepts U32/U16, SPIR-V accepts U32
only (VUID-InstanceIndex-InstanceIndex-04265).
- Rejected all sigpoints but Vertex In.
- On SPIR-V, the variable is decorated with `BuiltIn InstanceIndex`
instead of a user-assigned Location.
- SPIR-V lowering loads from the `InstanceIndex` (ID 43) built-in; DXIL
lowering uses `dx.op.loadInput`.
- LIT tests for sema (wrong type, wrong stage, output direction) and
codegen (BuiltIn decoration, no Location).

@dnovillo @pow2clk

Assisted-by: LLM



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