[all-commits] [llvm/llvm-project] 0e8478: [CIR] Zero-init array-new with trivial ctor (#205611)

[adams381 via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 0e847869ab8dde02815d82b67c7f0bb834653b51
      https://github.com/llvm/llvm-project/commit/0e847869ab8dde02815d82b67c7f0bb834653b51
  Author: adams381 <adams at nvidia.com>
  Date:   2026-06-25 (Thu, 25 Jun 2026)

  Changed paths:
    M clang/lib/CIR/CodeGen/CIRGenExprCXX.cpp
    A clang/test/CIR/CodeGen/new-array-init.cpp
    M clang/test/CIR/CodeGen/new.cpp
    M clang/test/CIR/CodeGen/paren-list-agg-init.cpp
    M clang/test/CIR/CodeGenCXX/new-array-init.cpp

  Log Message:
  -----------
  [CIR] Zero-init array-new with trivial ctor (#205611)

emitNewArrayInitializer hit errorNYI for a value-initialized array new of
a trivially-constructible element (new T[n]()), where the trailing
parentheses mean zero-initialization.  Route the trivial-ctor branch
through the existing tryMemsetInitialization() helper, following classic
CodeGen: a zero-initializable element gets operator new[] plus a single
memset to 0, while a non-zero-initializable element (an array of
pointers-to-data-member, whose null value is -1) declines the memset and
falls through to the constructor loop value-initializing each element.
Also add the getParent()->isEmpty() early return.  tryMemsetInitialization
builds the memset through the Address overload of createMemSet so the
destination alignment is preserved.

Found building the SPEC CPU 2026 LLVM benchmark (723.llvm_r / 823.llvm_s)
with ClangIR.



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