An extension that relaxes the constant address space requirement of printf format strings and string args

README.md

@@ -106,6 +106,7 @@ Khronos SPIR-V Registry](https://www.khronos.org/registry/spir-v/).
 1. [SPV_INTEL_split_barrier                 ]( http://htmlpreview.github.io/?https://github.com/KhronosGroup/SPIRV-Registry/blob/main/extensions/INTEL/SPV_INTEL_split_barrier.html)
 1. [SPV_KHR_ray_cull_mask                   ]( http://htmlpreview.github.io/?https://github.com/KhronosGroup/SPIRV-Registry/blob/main/extensions/KHR/SPV_KHR_ray_cull_mask.html)
 1. [SPV_KHR_fragment_shader_barycentric     ]( http://htmlpreview.github.io/?https://github.com/KhronosGroup/SPIRV-Registry/blob/main/extensions/KHR/SPV_KHR_fragment_shader_barycentric.html)
+1. [SPV_EXT_relaxed_printf_string_address_space      ]( http://htmlpreview.github.io/?https://github.com/KhronosGroup/SPIRV-Registry/blob/main/extensions/POCL/SPV_EXT_relaxed_printf_string_address_space.html)
 
 ## Non-Semantic Extended Instruction Set Specifications
 

extensions/EXT/SPV_EXT_relaxed_printf_string_address_space.asciidoc

@@ -0,0 +1,85 @@
+:extension_name: SPV_EXT_relaxed_printf_string_address_space
+
+= {extension_name}
+
+== Name Strings
+
+{extension_name}
+
+== Contact
+
+To report problems with this extension, please open a new issue at:
+
+https://github.com/KhronosGroup/SPIRV-Registry
+
+== Contributors
+
+Pekka Jääskeläinen, Parmance +
+Henry Linjamäki, Parmance +
+Brice Videau, Argonne National Laboratory +
+Anastasia Stulova, Arm
+
+== Notice
+
+Copyright (c) 2022 The Khronos Group Inc. Copyright terms at
+http://www.khronos.org/registry/speccopyright.html
+
+== Status
+
+Draft
+
+== Version
+
+[width="40%",cols="25,25"]
+|========================================
+| Last Modified Date | {docdate}
+| Revision           | 3
+|========================================
+
+== Dependencies
+
+This extension is written against the SPIR-V Specification,
+Version 1.5, Revision 3, Unified
+
+This extension is written against the OpenCL Extended Instruction Set
+Specification, Version 1.00, Revision 7
+
+This extension requires SPIR-V 1.0.
+
+== Overview
+
+This extension relaxes the address space requirement of the printf builtin
+to support the cl_ext_relaxed_printf_string_address_space OpenCL C extension.
+
+== Extension Name
+
+To use this extension within a SPIR-V module, the following
+*OpExtension* must be present in the module:
+
+[subs="attributes"]
+----
+OpExtension "{extension_name}"
+----
+
+== Modifications to the OpenCL Extended Instruction Set Specification, Version 1.00, Revision 4
+
+Modify Section 2.8, "Misc instructions", the printf description, the
+sentence "format must be a pointer(constant) to i8." to
+"format must be a pointer(constant, global, local, private, generic) to i8."
+
+=== Issues
+
+None
+
+Revision History
+----------------
+
+[cols="5,15,15,70"]
+[grid="rows"]
+[options="header"]
+|========================================
+|Rev|Date|Author|Changes
+|2|2022-06-13|Pekka Jääskeläinen, Anastasia Stulova| *The format pointer can also point to the generic address space.*
+|2|2022-05-14|Pekka Jääskeläinen, Brice Videau| *Changed to an 'ext' extension for multi-vendor adoption promotion.*
+|1|2022-04-08|Pekka Jääskeläinen|Initial RFC version.
+|========================================