[all-commits] [llvm/llvm-project] ef4746: [SPIRV] Start adding support for `int128` (#170798)

[Alex Voicu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ef47462ce9f1ade501da011a18869ea2a653d2cb
      https://github.com/llvm/llvm-project/commit/ef47462ce9f1ade501da011a18869ea2a653d2cb
  Author: Alex Voicu <alexandru.voicu at amd.com>
  Date:   2025-12-09 (Tue, 09 Dec 2025)

  Changed paths:
    M llvm/lib/Target/SPIRV/MCTargetDesc/SPIRVInstPrinter.cpp
    M llvm/lib/Target/SPIRV/SPIRVCommandLine.cpp
    M llvm/lib/Target/SPIRV/SPIRVGlobalRegistry.cpp
    M llvm/lib/Target/SPIRV/SPIRVLegalizerInfo.cpp
    M llvm/lib/Target/SPIRV/SPIRVModuleAnalysis.cpp
    M llvm/lib/Target/SPIRV/SPIRVUtils.cpp
    A llvm/test/CodeGen/SPIRV/extensions/SPV_ALTERA_arbitrary_precision_integers/i128-addsub.ll
    A llvm/test/CodeGen/SPIRV/extensions/SPV_ALTERA_arbitrary_precision_integers/i128-arith.ll
    A llvm/test/CodeGen/SPIRV/extensions/SPV_ALTERA_arbitrary_precision_integers/i128-switch-lower.ll
    M llvm/test/CodeGen/SPIRV/extensions/enable-all-extensions-but-one.ll

  Log Message:
  -----------
  [SPIRV] Start adding support for `int128` (#170798)

LLVM has pretty thorough support for `int128`, and it has started seeing
some use. Even thouth we already have support for the
`SPV_ALTERA_arbitrary_precision_integers` extension, the BE was oddly
capping integer width to 64-bits. This patch adds partial support for
lowering 128-bit integers to `OpTypeInt 128`. Some work remains to be
done around legalisation support and validating constant uses (e.g.
cases that get lowered to `OpSpecConstantOp`).



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