[all-commits] [llvm/llvm-project] 33fcd7: [HLSL] Add `InterlockedMax` function and resource ...

[Joshua Batista via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 33fcd70991316e238e63684cd4018f618d690668
      https://github.com/llvm/llvm-project/commit/33fcd70991316e238e63684cd4018f618d690668
  Author: Joshua Batista <jbatista at microsoft.com>
  Date:   2026-09-21 (Mon, 21 Sep 2026)

  Changed paths:
    M clang/include/clang/Basic/Builtins.td
    M clang/lib/CodeGen/CGHLSLBuiltins.cpp
    M clang/lib/Sema/HLSLBuiltinTypeDeclBuilder.cpp
    M clang/lib/Sema/HLSLExternalSemaSource.cpp
    M clang/lib/Sema/SemaHLSL.cpp
    A clang/test/CodeGenHLSL/builtins/InterlockedMax.hlsl
    M clang/test/CodeGenHLSL/builtins/RWBuffer-Interlocked.hlsl
    A clang/test/CodeGenHLSL/builtins/RWByteAddressBuffer-InterlockedMax.hlsl
    M clang/test/CodeGenHLSL/builtins/RWTexture-Interlocked.hlsl
    A clang/test/CodeGenHLSL/builtins/RasterizerOrderedByteAddressBuffer-InterlockedMax.hlsl
    A clang/test/SemaHLSL/BuiltIns/ByteAddressBuffer-InterlockedMax-errors.hlsl
    A clang/test/SemaHLSL/BuiltIns/ByteAddressBuffer-InterlockedMax-sm65-errors.hlsl
    A clang/test/SemaHLSL/BuiltIns/InterlockedMax-errors.hlsl

  Log Message:
  -----------
  [HLSL] Add `InterlockedMax` function and resource methods (#222160)

This PR adds the `InterlockedMax` standalone function and resource
methods.
It mimics the implementation of the `InterlockedMin` function and
resource
methods.

Like `min`, `max` is signedness aware. A signed operand lowers to
`atomicrmw max` and an unsigned operand lowers to `atomicrmw umax`. This
matches DXC, which selects between the `IMax` and `UMax` atomic binary
operations.

The PR also adds the 64-bit `InterlockedMax64` methods, which DXIL gates
on
shader model 6.6.

Fixes: https://github.com/llvm/llvm-project/issues/99124
Assisted by: Github Copilot



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