<table border="1" cellspacing="0" cellpadding="8">
    <tr>
        <th>Issue</th>
        <td>
            <a href=https://github.com/llvm/llvm-project/issues/99182>99182</a>
        </td>
    </tr>

    <tr>
        <th>Summary</th>
        <td>
            Implement the `AcceptHitAndEndSearch` HLSL Function
        </td>
    </tr>

    <tr>
      <th>Labels</th>
      <td>
            metabug,
            backend:DirectX,
            HLSL,
            backend:SPIR-V,
            bot:HLSL
      </td>
    </tr>

    <tr>
      <th>Assignees</th>
      <td>
      </td>
    </tr>

    <tr>
      <th>Reporter</th>
      <td>
          farzonl
      </td>
    </tr>
</table>

<pre>
    - [ ] Implement `AcceptHitAndEndSearch` clang builtin,
- [ ] Link `AcceptHitAndEndSearch` clang builtin with `hlsl_intrinsics.h`
- [ ] Add sema checks for `AcceptHitAndEndSearch` to `CheckHLSLBuiltinFunctionCall` in `SemaChecking.cpp`
- [ ] Add codegen for `AcceptHitAndEndSearch` to `EmitHLSLBuiltinExpr` in `CGBuiltin.cpp`
- [ ] Add codegen tests to `clang/test/CodeGenHLSL/builtins/AcceptHitAndEndSearch.hlsl`
- [ ] Add sema tests to `clang/test/SemaHLSL/BuiltIns/AcceptHitAndEndSearch-errors.hlsl`
- [ ] Create the `int_dx_AcceptHitAndEndSearch` intrinsic in `IntrinsicsDirectX.td`
- [ ] Create the `DXILOpMapping` of `int_dx_AcceptHitAndEndSearch` to  `156` in `DXIL.td`
- [ ] Create the `AcceptHitAndEndSearch.ll` and `AcceptHitAndEndSearch_errors.ll` tests in `llvm/test/CodeGen/DirectX/`
- [ ] Create the `int_spv_AcceptHitAndEndSearch` intrinsic in `IntrinsicsSPIRV.td`
- [ ] In SPIRVInstructionSelector.cpp create the `AcceptHitAndEndSearch` lowering and map  it to `int_spv_AcceptHitAndEndSearch` in `SPIRVInstructionSelector::selectIntrinsic`.
- [ ] Create SPIR-V backend test case in `llvm/test/CodeGen/SPIRV/hlsl-intrinsics/AcceptHitAndEndSearch.ll`

## DirectX

| DXIL Opcode | DXIL OpName | Shader Model | Shader Stages |
| ----------- | ----------- | ------------ | ------------- |
| 156 | AcceptHitAndEndSearch | 6.3 | ('anyhit',) |

## SPIR-V

# [OpTerminateRayKHR](https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#OpTerminateRayKHR):

## Description:
 
Reserved.

[Capability](https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#Capability): 
**RayTracingKHR**  
 
[Reserved](https://registry.khronos.org/SPIR-V/specs/unified1/SPIRV.html#Unified).

| Word Count | Opcode | Results | Operands |
|------------|--------|---------|----------|
| 1          | 4449   | |          |



## Test Case(s)

 
 ### Example 1
```hlsl
//dxc AcceptHitAndEndSearch_test.hlsl -T lib_6_8 -enable-16bit-types -O0

struct [raypayload] RayPayload
{
        float4 color : write(caller) : read(anyhit);
        float distance : write(caller) : read(anyhit);
};

struct Attributes {
        float3 barycentrics;
        uint primitiveIndex;
};

[shader("anyhit")]
export void fn(inout RayPayload payload, in Attributes attributes) {
        return AcceptHitAndEndSearch();
}
```
 ### SPIRV Example(s):

 ### Example 2
```hlsl
//dxc AcceptHitAndEndSearch_spirv_test.hlsl -T lib_6_8 -E fn -enable-16bit-types -spirv -fspv-target-env=universal1.5 -fcgl -O0

struct [raypayload] RayPayload
{
        float4 color : write(caller) : read(anyhit);
        float distance : write(caller) : read(anyhit);
};

struct Attributes {
        float3 barycentrics;
        uint primitiveIndex;
};

[shader("anyhit")]
void fn(inout RayPayload payload, in Attributes attributes) {
        return AcceptHitAndEndSearch();
}
```
## HLSL:

Used in an [any hit shader](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/any-hit-shader.md) to commit the current hit and then stop searching for more hits for the ray. If there is an intersection shader running, it's execution stops.  Execution passes to the [closest hit shader](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/closest-hit-shader.md), if enabled, with the closest hit recorded so far.

## Syntax

```
void AcceptHitAndEndSearch();
```




## Return Value

**void**

## Remarks

This function can be called from the following raytracing shader types:

* [**Callable Shader**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/callable-shader.md)
* [**Closest Hit Shader**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/closest-hit-shader.md)
* [**Miss Shader**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/miss-shader.md)
* [**Ray Generation Shader**](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/ray-generation-shader.md)



## See also

* [Direct3D 12 raytracing HLSL reference](https://github.com/MicrosoftDocs/win32/blob/docs/desktop-src//direct3dhlsl/direct3d-12-raytracing-hlsl-reference.md)
</pre>
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