tree 1fa2cd37e286512bb22814d354737faaba594196
parent 34be80aa6edda60e240e4ea46f28b1b54ababf72
author Helena Kotas <hekotas@microsoft.com> 1747273277 -0700
committer GitHub <noreply@github.com> 1747273277 -0700
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[HLSL] Add resource constructor with implicit binding for global resources (#138976)

Adds constructor for resources with implicit binding and applies it to
all resources without binding at the global scope.
Adds Clang builtin function
`__builtin_hlsl_resource_handlefromimplicitbinding` that gets translated
to `llvm.dx|spv.resource.handlefromimplicitbinding` intrinsic calls.
Specific bindings are assigned in DXILResourceImplicitBinding pass.

Design proposals:

https://github.com/llvm/wg-hlsl/blob/main/proposals/0024-implicit-resource-binding.md

https://github.com/llvm/wg-hlsl/blob/main/proposals/0025-resource-constructors.md

One change from the proposals is that the `orderId` parameter is added
onto the constructor. Originally it was supposed to be generated in
codegen when the `llvm.dx|spv.resource.handlefromimplicitbinding` call
is emitted, but that is not possible because the call is inside a
constructor, and the constructor body is generated once per resource
type and not resource instance. So the only way to inject instance-based
data like `orderId` into the
`llvm.dx|spv.resource.handlefromimplicitbinding` call is that it must
come in via the constructor argument.

Closes #136784