# VK_KHR_shader_expect_assume(3) Manual Page

## Name

VK_KHR_shader_expect_assume - device extension

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## Registered Extension Number

545

## Revision

1

## Ratification Status

Ratified

## Extension and Version Dependencies

VK_KHR_get_physical_device_properties2
or
Vulkan Version 1.1

## SPIR-V Dependencies

- SPV_KHR_expect_assume

## Deprecation State

- Promoted to Vulkan 1.4

## Contact

- Kevin Petit [GitHub]kpet

## Extension Proposal

VK_KHR_shader_expect_assume

## Other Extension Metadata

Last Modified Date

  2023-12-06

IP Status

  No known IP claims.

Contributors

  - Kevin Petit, Arm

  - Tobias Hector, AMD

  - James Fitzpatrick, Imagination Technologies

## Description

This extension allows the use of the `SPV_KHR_expect_assume` extension in SPIR-V shader modules which enables SPIR-V producers to provide optimization hints to the Vulkan implementation.

## New Structures

- Extending VkPhysicalDeviceFeatures2, VkDeviceCreateInfo:

  - VkPhysicalDeviceShaderExpectAssumeFeaturesKHR

## New Enum Constants

- `VK_KHR_SHADER_EXPECT_ASSUME_EXTENSION_NAME`

- `VK_KHR_SHADER_EXPECT_ASSUME_SPEC_VERSION`

- Extending VkStructureType:

  - `VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_SHADER_EXPECT_ASSUME_FEATURES_KHR`

## New SPIR-V Capabilities

- ExpectAssumeKHR

## Promotion to Vulkan 1.4

Functionality in this extension is included in core Vulkan 1.4 with the KHR suffix omitted. The original type, enum and command names are still available as aliases of the core functionality.

## Version History

- Revision 1, 2023-12-06 (Kevin Petit)

  - Initial revision

## See Also

No cross-references are available

## Document Notes

For more information, see the Vulkan Specification

This page is a generated document. Fixes and changes should be made to the generator scripts, not directly.

## Copyright

Copyright 2014-2025 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0