[all-commits] [llvm/llvm-project] 78cefa: [AMDGPU] Add `.amdgpu.info` section for per-functi...

[Shilei Tian via All-commits]

  Branch: refs/heads/users/shiltian/amdgpu-function-info
  Home:   https://github.com/llvm/llvm-project
  Commit: 78cefa3e18659ed33e428e4206d9e32d6f1b54c0
      https://github.com/llvm/llvm-project/commit/78cefa3e18659ed33e428e4206d9e32d6f1b54c0
  Author: Shilei Tian <i at tianshilei.me>
  Date:   2026-04-16 (Thu, 16 Apr 2026)

  Changed paths:
    A llvm/include/llvm/Support/AMDGPUObjLinkingInfo.h
    M llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.cpp
    M llvm/lib/Target/AMDGPU/AMDGPUAsmPrinter.h
    M llvm/lib/Target/AMDGPU/AMDGPUMCInstLower.cpp
    M llvm/lib/Target/AMDGPU/AsmParser/AMDGPUAsmParser.cpp
    M llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUTargetStreamer.cpp
    M llvm/lib/Target/AMDGPU/MCTargetDesc/AMDGPUTargetStreamer.h
    A llvm/test/CodeGen/AMDGPU/lds-link-time-codegen-callgraph.ll
    A llvm/test/CodeGen/AMDGPU/lds-link-time-codegen-cross-tu-addr-taken.ll
    A llvm/test/CodeGen/AMDGPU/lds-link-time-codegen-indirect.ll
    M llvm/test/CodeGen/AMDGPU/lds-link-time-codegen-named-barrier.ll
    A llvm/test/CodeGen/AMDGPU/lds-link-time-codegen-prototype.ll
    M llvm/test/CodeGen/AMDGPU/lds-link-time-codegen.ll
    A llvm/test/MC/AMDGPU/amdgpu-info-roundtrip.s

  Log Message:
  -----------
  [AMDGPU] Add `.amdgpu.info` section for per-function metadata

AMDGPU object linking requires the linker to propagate resource usage
(registers, stack, LDS) across translation units. To support this, the compiler
must emit per-function metadata and call graph edges in the relocatable object
so the linker can compute whole-program resource requirements.

This PR introduces a `.amdgpu.info` ELF section using a tagged, length-prefixed
binary format: each entry is encoded as:

```
[kind: u8] [len: u8] [payload: <len> bytes]
```

A function scope is opened by an `INFO_FUNC` entry (containing a symbol
reference), followed by per-function attributes (register counts, flags, private
segment size) and relational edges (direct calls, LDS uses, indirect call
signatures). String data such as function type signatures is stored in a
companion `.amdgpu.strtab` section.

The format is forward-compatible: a consumer that encounters an unknown kind can
skip it by reading the length byte, allowing new entry kinds to be added without
breaking existing toolchains.



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